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"text": "Repository-scoped vulnerability detection task.\n\nTask: Scan `sys/rpc/rpcsec_gss/svc_rpcsec_gss.c` for concrete, evidence-backed vulnerabilities. Report only real issues in the target file.\nRepository root: `freebsd`\nSession directory: `freebsd`\nTarget source directory: `freebsd/sys/rpc/rpcsec_gss`\nTarget source path: `freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c`\nTarget repo-relative path: `sys/rpc/rpcsec_gss/svc_rpcsec_gss.c`\nTarget total lines: 1716\nConfigured context hints: none\nYou may inspect any file under the repository root.\nUse repo-relative paths when referencing other files.\nUse 1-based line numbers for the target file.\nDo not modify files.\n\nReview plan:\n# Review Plan\n\nUse this plan to drive the vulnerability review of the target file.\n\n## Target\n- File: `sys/rpc/rpcsec_gss/svc_rpcsec_gss.c`\n- Total lines: 1716\n\n## Summary\nFull-file security review plan for sys/rpc/rpcsec_gss/svc_rpcsec_gss.c (1715 lines), the FreeBSD kernel's server-side RPCSEC_GSS authentication implementation. The file processes attacker-controlled RPC credentials from the network, manages GSS security contexts, handles sequence number replay detection, and constructs kernel credentials (ucred) from GSS-derived unix identities. Key security-sensitive areas include: (1) svc_rpc_gss_validate's fixed-size stack buffer for RPC header reconstruction where oa_length from the wire controls a memcpy, (2) the main svc_rpc_gss handler which deserializes attacker-controlled credentials and manages the client state machine, (3) sequence window replay detection with potential undefined behavior in bit-shift operations, (4) client ID generation using a predictable incrementing counter with modulo hash indexing where the divisor is sysctl-tunable, (5) credential construction in rpc_gss_svc_getcred and svc_rpc_gss_build_ucred, and (6) principal name construction in rpc_gss_get_principal_name with potential off-by-one in buffer sizing. The file has been split into 42 non-overlapping chunks organized by function boundaries, with context files from the rpcsec_gss subsystem headers, RPC auth headers, and the protocol encoding file.\n\n## Planned Chunks\n### 1. License/includes and forward declarations\n- Lines: 1-95\n- Rationale: License headers, #include directives, and forward declarations. Minimal security surface, but includes define the attack surface scope.\n- Context files: `sys/rpc/rpcsec_gss/rpcsec_gss_int.h`, `sys/rpc/rpcsec_gss.h`\n\n### 2. Data structures: callback, svc_name, client state, cookedcred\n- Lines: 96-169\n- Rationale: Defines client state machine, sequence window bitmask, credential structures. Sizing of cl_seqmask and the fixed cl_gid_storage array are security-relevant for later analysis of overflow or bounds issues.\n- Context files: `sys/rpc/rpcsec_gss/rpcsec_gss_int.h`, `sys/rpc/rpcsec_gss.h`\n\n### 3. Global variables and sysctl tunables\n- Lines: 170-200\n- Rationale: Sysctl-writable CLIENT_MAX and client_hash_size are used for array indexing and loop bounds. An attacker-influenced sysctl could affect hash table indexing or DoS thresholds.\n- Context files: `sys/rpc/rpcsec_gss/rpcsec_gss_int.h`\n\n### 4. svc_rpc_gss_init (SYSINIT)\n- Lines: 202-210\n- Rationale: System initialization registering the GSS auth handler. Simple setup, low risk.\n- Context files: `sys/rpc/svc_auth.h`\n\n### 5. svc_rpc_gss_cleanup (SYSUNINIT)\n- Lines: 212-219\n- Rationale: System uninit cleanup. Minimal code.\n- Context files: none\n\n### 6. svc_rpc_gss_vnetinit\n- Lines: 221-234\n- Rationale: Allocates hash table based on svc_rpc_gss_client_hash_size. If hash_size is 0 or very large, mem_alloc could have issues. Integer overflow in size calculation is possible.\n- Context files: none\n\n### 7. svc_rpc_gss_vnet_cleanup\n- Lines: 236-245\n- Rationale: Frees hash table memory. Straightforward cleanup.\n- Context files: none\n\n### 8. rpc_gss_set_callback\n- Lines: 247-263\n- Rationale: Registers a callback. Uses sx_xlock for synchronization. Simple allocation and list insert.\n- Context files: `sys/rpc/rpcsec_gss.h`\n\n### 9. rpc_gss_clear_callback\n- Lines: 265-283\n- Rationale: Removes a callback from the list. Properly acquires and releases lock.\n- Context files: none\n\n### 10. rpc_gss_acquire_svc_cred\n- Lines: 285-317\n- Rationale: Acquires GSS credentials using sn_principal. If sn_principal is attacker-influenced, strlen without bounds could be risky, though typically set by admin. GSS API error handling matters here.\n- Context files: `sys/rpc/rpcsec_gss/rpcsec_gss_int.h`\n\n### 11. rpc_gss_set_svc_name\n- Lines: 319-350\n- Rationale: Admin-facing API to register a service name. Allocations and list insert under lock.\n- Context files: `sys/rpc/rpcsec_gss.h`\n\n### 12. rpc_gss_clear_svc_name\n- Lines: 352-372\n- Rationale: Removes a service name from the list. Properly releases credential.\n- Context files: none\n\n### 13. rpc_gss_get_principal_name\n- Lines: 374-456\n- Rationale: Constructs a principal name from name/node/domain components using strlen and strcat into a buffer sized by namelen. Off-by-one risk in buffer size calculation (namelen includes NUL for name but '/' and '@' separator logic may miscount). This is security-critical as it handles principal name construction.\n- Context files: `sys/rpc/rpcsec_gss.h`\n\n### 14. rpc_gss_ip_to_srv_principal\n- Lines: 458-487\n- Rationale: Copies srv_name into srv_principal buffer with only NI_MAXSERV length check. The comment warns ip_addr and srv_principal can alias. Buffer overflow risk depends on caller-provided buffer size vs DNS result length.\n- Context files: none\n\n### 15. rpc_gss_getcred\n- Lines: 489-508\n- Rationale: Returns pointers to client credential data. The rq_clntcred cast to svc_rpc_gss_cookedcred is unchecked beyond flavor check. Could return stale pointers if client lifecycle is mismanaged.\n- Context files: `sys/rpc/svc.h`, `sys/rpc/rpcsec_gss.h`\n\n### 16. rpc_gss_svc_getcred\n- Lines: 510-546\n- Rationale: Creates kernel ucred from GSS unix credentials. Uses uc->uid, uc->gid, uc->gidlist which come from gss_pname_to_unix_cred. Sets cr_prison from curthread without validation. Race condition if cl_cred is set concurrently. Security-critical credential construction.\n- Context files: `sys/rpc/rpcsec_gss.h`, `sys/rpc/svc.h`\n\n### 17. rpc_gss_svc_max_data_length\n- Lines: 548-589\n- Rationale: Calculates max data length for wrap. Integer truncation from OM_uint32 to int is handled with negative check.\n- Context files: none\n\n### 18. svc_rpc_gss_find_client\n- Lines: 591-626\n- Rationale: Looks up client by ID from network-supplied handle. Uses ci_id modulo hash_size for indexing. If hash_size is 0 (sysctl tunable), division by zero. Validates hostid and boottime but these may be predictable. Refcount acquire under lock is critical.\n- Context files: `sys/rpc/rpcsec_gss/rpcsec_gss_int.h`\n\n### 19. svc_rpc_gss_create_client\n- Lines: 628-669\n- Rationale: Creates new client from network request. Client ID is a simple incrementing counter (svc_rpc_gss_next_clientid++) which is predictable. Hash index uses same modulo operation. No check for mem_alloc failure after memset. Counter overflow wraps to reuse IDs.\n- Context files: none\n\n### 20. svc_rpc_gss_destroy_client\n- Lines: 671-695\n- Rationale: Frees client resources including GSS context, name, principal, and kernel cred. Must ensure all fields are properly cleaned to avoid double-free or use-after-free.\n- Context files: none\n\n### 21. svc_rpc_gss_release_client\n- Lines: 697-707\n- Rationale: Refcount-based client release. If refcount_release has bugs or races, use-after-free is possible.\n- Context files: none\n\n### 22. svc_rpc_gss_forget_client_locked\n- Lines: 709-724\n- Rationale: Removes client from hash and global lists. Must be called with lock held (assert present). Decrements global count.\n- Context files: none\n\n### 23. svc_rpc_gss_forget_client\n- Lines: 726-752\n- Rationale: Checks if client is still in the list before removing. Guards against double removal. Lock acquisition and release patterns matter for correctness.\n- Context files: none\n\n### 24. svc_rpc_gss_timeout_clients\n- Lines: 754-790\n- Rationale: Garbage-collects stale or expired clients. The 'goto again' pattern after dropping and reacquiring lock is a potential source of races. The while loop enforcing client_max uses TAILQ_LAST which may be O(n).\n- Context files: none\n\n### 25. gss_oid_to_str (DEBUG only)\n- Lines: 792-866\n- Rationale: Debug-only OID to string conversion using sprintf/strcat into calculated-length buffer. Buffer overflow risk if length calculation is wrong vs. actual sprintf output. Only compiled under DEBUG.\n- Context files: none\n\n### 26. svc_rpc_gss_build_ucred\n- Lines: 868-887\n- Rationale: Builds unix credentials from GSS name. Sets default uid/gid to 65534 (nobody). gss_pname_to_unix_cred writes numgroups into gidlist which is backed by cl_gid_storage[NGROUPS]. Must verify numgroups does not exceed NGROUPS.\n- Context files: `sys/rpc/rpcsec_gss.h`\n\n### 27. svc_rpc_gss_set_flavor\n- Lines: 889-915\n- Rationale: Maps mechanism OID and service type to RPC pseudo flavor. Simple switch statement.\n- Context files: none\n\n### 28. svc_rpc_gss_accept_sec_context (first half: setup through first accept)\n- Lines: 917-1023\n- Rationale: Core security context acceptance. Processes attacker-controlled GSS tokens from the network. Iterates server names under lock, calls gss_accept_sec_context. Static my_krb_imp variable is a potential race in multi-threaded context. The 'retry' goto after credential expiry could loop indefinitely.\n- Context files: `sys/rpc/rpcsec_gss/rpcsec_gss_int.h`, `sys/rpc/rpcsec_gss/rpcsec_gss_prot.c`\n\n### 29. svc_rpc_gss_accept_sec_context (second half: continuation and completion)\n- Lines: 1024-1156\n- Rationale: Handles CONTINUE_INIT path and context completion. Sets client expiration, fills rawcred including client_principal from export_name. mem_alloc for client_principal uses export_name.length without overflow check on sizeof + length addition. Releases cl_cname after building ucred.\n- Context files: `sys/rpc/rpcsec_gss/rpcsec_gss_int.h`, `sys/rpc/rpcsec_gss.h`\n\n### 30. svc_rpc_gss_validate\n- Lines: 1158-1215\n- Rationale: Validates RPC message integrity by reconstructing the RPC header and verifying the MIC. Fixed-size rpchdr[128/sizeof(int32_t)] buffer (128 bytes) is filled with header fields including oa_length bytes of credential data via memcpy. If oa_length exceeds remaining buffer space, stack buffer overflow occurs. RNDUP(oa_length) could also overflow.\n- Context files: `sys/rpc/auth.h`, `sys/rpc/rpc_msg.h`\n\n### 31. svc_rpc_gss_nextverf\n- Lines: 1217-1251\n- Rationale: Generates next verifier by signing the sequence number. KASSERT checks mic.length <= MAX_AUTH_BYTES but KASSERT is compiled out in non-debug kernels, leaving a potential overflow of rq_verf.oa_base.\n- Context files: `sys/rpc/auth.h`, `sys/rpc/svc.h`\n\n### 32. svc_rpc_gss_callback\n- Lines: 1253-1309\n- Rationale: Invokes user-registered callbacks with client context. The callback can veto the connection. If callback misbehaves, credential leak is possible (cl_creds release path). Iterates callback list without lock.\n- Context files: `sys/rpc/rpcsec_gss.h`\n\n### 33. svc_rpc_gss_check_replay\n- Lines: 1311-1344\n- Rationale: Sequence number replay detection using bitmask window. Checks if sequence is within the window and not already seen. The offset/word/bit calculation must be correct to prevent replay attacks. Integer underflow if cl_seqlast < seq but code handles seq <= cl_seqlast case.\n- Context files: none\n\n### 34. svc_rpc_gss_update_seq\n- Lines: 1346-1386\n- Rationale: Updates sequence window bitmask. The bit-shift operation 'cl_seqmask[i] >> (32 - offset)' is undefined behavior when offset is 0 (shifts by 32 on a 32-bit type). Window sliding logic must be correct to maintain replay protection.\n- Context files: none\n\n### 35. svc_rpc_gss main handler (credential parsing and client lookup)\n- Lines: 1388-1465\n- Rationale: Main authentication entry point. Deserializes attacker-controlled credentials via XDR. Checks gc_handle.length for client lookup. The rq_clntcred cast to svc_rpc_gss_cookedcred assumes rq_credarea is large enough (3*MAX_AUTH_BYTES = 1200 bytes vs sizeof cookedcred). Client ID from network is used directly for hash lookup.\n- Context files: `sys/rpc/rpcsec_gss/rpcsec_gss_int.h`, `sys/rpc/rpcsec_gss/rpcsec_gss_prot.c`, `sys/rpc/svc.h`\n\n### 36. svc_rpc_gss main handler (service/seq validation)\n- Lines: 1466-1490\n- Rationale: Validates sequence number overflow (MAXSEQ) and service type for DATA/DESTROY procs. These are critical gatekeeping checks before processing the request.\n- Context files: `sys/rpc/rpcsec_gss/rpcsec_gss_int.h`\n\n### 37. svc_rpc_gss main handler (INIT/CONTINUE_INIT case)\n- Lines: 1492-1537\n- Rationale: Handles context establishment. Calls accept_sec_context and sends reply with GSS token. If gr_major is COMPLETE, sets client state to ESTABLISHED. Borrows call verf space for reply verf which could be a problem if sizes mismatch.\n- Context files: `sys/rpc/rpcsec_gss/rpcsec_gss_int.h`\n\n### 38. svc_rpc_gss main handler (DATA case with callback and lock enforcement)\n- Lines: 1539-1649\n- Rationale: Handles DATA and DESTROY operations. Performs replay check, validation, sequence update. The callback invocation under cl_lock and subsequent lock/qop enforcement is complex. Extra refcount acquire for the auth ops release path. TOCTOU between check_replay and update_seq if another thread processes the same sequence.\n- Context files: `sys/rpc/rpcsec_gss/rpcsec_gss_int.h`, `sys/rpc/svc.h`\n\n### 39. svc_rpc_gss main handler (cleanup and return)\n- Lines: 1650-1662\n- Rationale: Cleanup path: releases client ref, frees XDR-decoded gc structure, restores VNET. Must ensure all paths through the switch properly reach this cleanup to avoid resource leaks.\n- Context files: none\n\n### 40. svc_rpc_gss_wrap\n- Lines: 1664-1682\n- Rationale: Wraps reply data using GSS. Casts auth->svc_ah_private to cookedcred. Passes client context, qop, service, seq to xdr_rpc_gss_wrap_data.\n- Context files: `sys/rpc/rpcsec_gss/rpcsec_gss_prot.c`\n\n### 41. svc_rpc_gss_unwrap\n- Lines: 1684-1702\n- Rationale: Unwraps request data using GSS. Same cast pattern. Delegates to xdr_rpc_gss_unwrap_data which processes attacker-controlled encrypted/signed data.\n- Context files: `sys/rpc/rpcsec_gss/rpcsec_gss_prot.c`\n\n### 42. svc_rpc_gss_release\n- Lines: 1704-1715\n- Rationale: Releases client reference acquired during request processing. Simple delegation to release_client.\n- Context files: none\n\nReview chunks in the listed order. Higher-priority chunks should receive the most attention first.\n\nTarget file: `sys/rpc/rpcsec_gss/svc_rpcsec_gss.c`.\nAssigned chunk 30 of 42: svc_rpc_gss_validate.\nFocus on lines 1158-1215.\nSuggested context files: `sys/rpc/auth.h`, `sys/rpc/rpc_msg.h`.\nInspect the target file directly before deciding a chunk is safe.\nRead enough surrounding target-file context to understand the full helper, function, type, or control-flow block that contains this chunk.\nPrimary evidence for any reported issue must be inside the assigned chunk lines.\nYou may inspect any repository file to confirm or refute behavior.\nTrace at least one caller, callee, or downstream consumer for the strongest hypotheses when available.\nAsk whether the chunk exposes weaker semantics than its helper name, comment, or caller expectations imply.\nDo not treat a documented behavior as automatically safe; check whether callers rely on a stronger invariant.\nBefore returning `findings: []`, rule out at least three concrete attacker stories, not three variations of the same story.\nIf there is no concrete vulnerability in this chunk, return `findings: []`.\nDo not report style issues, hardening suggestions, or vague concerns."
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"limit": 58
},
"output": "freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c\nfile\n\n1158: static bool_t\n1159: svc_rpc_gss_validate(struct svc_rpc_gss_client *client, struct rpc_msg *msg,\n1160: gss_qop_t *qop, rpc_gss_proc_t gcproc)\n1161: {\n1162: \tstruct opaque_auth\t*oa;\n1163: \tgss_buffer_desc\t\t rpcbuf, checksum;\n1164: \tOM_uint32\t\t maj_stat, min_stat;\n1165: \tgss_qop_t\t\t qop_state;\n1166: \tint32_t\t\t\t rpchdr[128 / sizeof(int32_t)];\n1167: \tint32_t\t\t\t*buf;\n1168: \n1169: \trpc_gss_log_debug(\"in svc_rpc_gss_validate()\");\n1170: \t\n1171: \tmemset(rpchdr, 0, sizeof(rpchdr));\n1172: \n1173: \t/* Reconstruct RPC header for signing (from xdr_callmsg). */\n1174: \tbuf = rpchdr;\n1175: \tIXDR_PUT_LONG(buf, msg->rm_xid);\n1176: \tIXDR_PUT_ENUM(buf, msg->rm_direction);\n1177: \tIXDR_PUT_LONG(buf, msg->rm_call.cb_rpcvers);\n1178: \tIXDR_PUT_LONG(buf, msg->rm_call.cb_prog);\n1179: \tIXDR_PUT_LONG(buf, msg->rm_call.cb_vers);\n1180: \tIXDR_PUT_LONG(buf, msg->rm_call.cb_proc);\n1181: \toa = &msg->rm_call.cb_cred;\n1182: \tIXDR_PUT_ENUM(buf, oa->oa_flavor);\n1183: \tIXDR_PUT_LONG(buf, oa->oa_length);\n1184: \tif (oa->oa_length) {\n1185: \t\tmemcpy((caddr_t)buf, oa->oa_base, oa->oa_length);\n1186: \t\tbuf += RNDUP(oa->oa_length) / sizeof(int32_t);\n1187: \t}\n1188: \trpcbuf.value = rpchdr;\n1189: \trpcbuf.length = (u_char *)buf - (u_char *)rpchdr;\n1190: \n1191: \tchecksum.value = msg->rm_call.cb_verf.oa_base;\n1192: \tchecksum.length = msg->rm_call.cb_verf.oa_length;\n1193: \t\n1194: \tmaj_stat = gss_verify_mic(&min_stat, client->cl_ctx, &rpcbuf, &checksum,\n1195: \t\t\t\t &qop_state);\n1196: \t\n1197: \tif (maj_stat != GSS_S_COMPLETE) {\n1198: \t\trpc_gss_log_status(\"gss_verify_mic\", client->cl_mech,\n1199: \t\t maj_stat, min_stat);\n1200: \t\t/*\n1201: \t\t * A bug in some versions of the Linux client generates a\n1202: \t\t * Destroy operation with a bogus encrypted checksum. Deleting\n1203: \t\t * the credential handle for that case causes the mount to fail.\n1204: \t\t * Since the checksum is bogus (gss_verify_mic() failed), it\n1205: \t\t * doesn't make sense to destroy the handle and not doing so\n1206: \t\t * fixes the Linux mount.\n1207: \t\t */\n1208: \t\tif (gcproc != RPCSEC_GSS_DESTROY)\n1209: \t\t\tclient->cl_state = CLIENT_STALE;\n1210: \t\treturn (FALSE);\n1211: \t}\n1212: \n1213: \t*qop = qop_state;\n1214: \treturn (TRUE);\n1215: }\n\n(Showing lines 1158-1215 of 1715. Use offset=1216 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "todowrite",
"state": {
"status": "completed",
"input": {
"todos": [
{
"content": "Read task.md and guide.md for context",
"status": "completed",
"priority": "high"
},
{
"content": "Read the target chunk (lines 1158-1215) of svc_rpcsec_gss.c",
"status": "completed",
"priority": "high"
},
{
"content": "Read surrounding context in the target file",
"status": "in_progress",
"priority": "high"
},
{
"content": "Read context files (auth.h, rpc_msg.h)",
"status": "pending",
"priority": "high"
},
{
"content": "Trace callers of svc_rpc_gss_validate",
"status": "pending",
"priority": "high"
},
{
"content": "Formulate and test at least 3 attacker-controlled failure hypotheses",
"status": "pending",
"priority": "high"
},
{
"content": "Report findings via StructuredOutput",
"status": "pending",
"priority": "high"
}
]
},
"output": "[\n {\n \"content\": \"Read task.md and guide.md for context\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Read the target chunk (lines 1158-1215) of svc_rpcsec_gss.c\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Read surrounding context in the target file\",\n \"status\": \"in_progress\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Read context files (auth.h, rpc_msg.h)\",\n \"status\": \"pending\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Trace callers of svc_rpc_gss_validate\",\n \"status\": \"pending\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Formulate and test at least 3 attacker-controlled failure hypotheses\",\n \"status\": \"pending\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Report findings via StructuredOutput\",\n \"status\": \"pending\",\n \"priority\": \"high\"\n }\n]"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c",
"offset": 96,
"limit": 74
},
"output": "freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c\nfile\n\n96: struct sx svc_rpc_gss_lock;\n97: \n98: struct svc_rpc_gss_callback {\n99: \tSLIST_ENTRY(svc_rpc_gss_callback) cb_link;\n100: \trpc_gss_callback_t\tcb_callback;\n101: };\n102: SLIST_HEAD(svc_rpc_gss_callback_list, svc_rpc_gss_callback);\n103: KGSS_VNET_DEFINE_STATIC(struct svc_rpc_gss_callback_list,\n104: svc_rpc_gss_callbacks) = SLIST_HEAD_INITIALIZER(svc_rpc_gss_callbacks);\n105: \n106: struct svc_rpc_gss_svc_name {\n107: \tSLIST_ENTRY(svc_rpc_gss_svc_name) sn_link;\n108: \tchar\t\t\t*sn_principal;\n109: \tgss_OID\t\t\tsn_mech;\n110: \tu_int\t\t\tsn_req_time;\n111: \tgss_cred_id_t\t\tsn_cred;\n112: \tu_int\t\t\tsn_program;\n113: \tu_int\t\t\tsn_version;\n114: };\n115: SLIST_HEAD(svc_rpc_gss_svc_name_list, svc_rpc_gss_svc_name);\n116: KGSS_VNET_DEFINE_STATIC(struct svc_rpc_gss_svc_name_list,\n117: svc_rpc_gss_svc_names) = SLIST_HEAD_INITIALIZER(svc_rpc_gss_svc_names);\n118: \n119: enum svc_rpc_gss_client_state {\n120: \tCLIENT_NEW,\t\t\t\t/* still authenticating */\n121: \tCLIENT_ESTABLISHED,\t\t\t/* context established */\n122: \tCLIENT_STALE\t\t\t\t/* garbage to collect */\n123: };\n124: \n125: #define SVC_RPC_GSS_SEQWINDOW\t128\n126: \n127: struct svc_rpc_gss_clientid {\n128: \tunsigned long\t\tci_hostid;\n129: \tuint32_t\t\tci_boottime;\n130: \tuint32_t\t\tci_id;\n131: };\n132: \n133: struct svc_rpc_gss_client {\n134: \tTAILQ_ENTRY(svc_rpc_gss_client) cl_link;\n135: \tTAILQ_ENTRY(svc_rpc_gss_client) cl_alllink;\n136: \tvolatile u_int\t\tcl_refs;\n137: \tstruct sx\t\tcl_lock;\n138: \tstruct svc_rpc_gss_clientid cl_id;\n139: \ttime_t\t\t\tcl_expiration;\t/* when to gc */\n140: \tenum svc_rpc_gss_client_state cl_state;\t/* client state */\n141: \tbool_t\t\t\tcl_locked;\t/* fixed service+qop */\n142: \tgss_ctx_id_t\t\tcl_ctx;\t\t/* context id */\n143: \tgss_cred_id_t\t\tcl_creds;\t/* delegated creds */\n144: \tgss_name_t\t\tcl_cname;\t/* client name */\n145: \tstruct svc_rpc_gss_svc_name *cl_sname;\t/* server name used */\n146: \trpc_gss_rawcred_t\tcl_rawcred;\t/* raw credentials */\n147: \trpc_gss_ucred_t\t\tcl_ucred;\t/* unix-style credentials */\n148: \tstruct ucred\t\t*cl_cred;\t/* kernel-style credentials */\n149: \tint\t\t\tcl_rpcflavor;\t/* RPC pseudo sec flavor */\n150: \tbool_t\t\t\tcl_done_callback; /* TRUE after call */\n151: \tvoid\t\t\t*cl_cookie;\t/* user cookie from callback */\n152: \tgid_t\t\t\tcl_gid_storage[NGROUPS];\n153: \tgss_OID\t\t\tcl_mech;\t/* mechanism */\n154: \tgss_qop_t\t\tcl_qop;\t\t/* quality of protection */\n155: \tuint32_t\t\tcl_seqlast;\t/* sequence window origin */\n156: \tuint32_t\t\tcl_seqmask[SVC_RPC_GSS_SEQWINDOW/32]; /* bitmask of seqnums */\n157: };\n158: TAILQ_HEAD(svc_rpc_gss_client_list, svc_rpc_gss_client);\n159: \n160: /*\n161: * This structure holds enough information to unwrap arguments or wrap\n162: * results for a given request. We use the rq_clntcred area for this\n163: * (which is a per-request buffer).\n164: */\n165: struct svc_rpc_gss_cookedcred {\n166: \tstruct svc_rpc_gss_client *cc_client;\n167: \trpc_gss_service_t\tcc_service;\n168: \tuint32_t\t\tcc_seq;\n169: };\n\n(Showing lines 96-169 of 1715. Use offset=170 to continue.)\n"
}
},
{
"type": "tool",
"tool": "grep",
"state": {
"status": "completed",
"input": {
"pattern": "svc_rpc_gss_validate",
"path": "freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c"
},
"output": "Found 3 matches\nfreebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c:\n Line 1159: svc_rpc_gss_validate(struct svc_rpc_gss_client *client, struct rpc_msg *msg,\n\n Line 1169: \trpc_gss_log_debug(\"in svc_rpc_gss_validate()\");\n\n Line 1546: \t\tif (!svc_rpc_gss_validate(client, msg, &qop, gc.gc_proc)) {\n"
}
},
{
"type": "tool",
"tool": "grep",
"state": {
"status": "completed",
"input": {
"pattern": "IXDR_PUT_LONG|IXDR_PUT_ENUM",
"path": "freebsd/sys/rpc",
"include": "*.h"
},
"output": "Found 6 matches\nfreebsd/sys/rpc/xdr.h:\n Line 279: #define IXDR_PUT_LONG(buf, v)\t\t(*(buf)++ =(int32_t)__htonl((uint32_t)v))\n\n Line 287: #define IXDR_PUT_BOOL(buf, v)\t\tIXDR_PUT_LONG((buf), (v))\n\n Line 288: #define IXDR_PUT_ENUM(buf, v)\t\tIXDR_PUT_LONG((buf), (v))\n\n Line 289: #define IXDR_PUT_U_LONG(buf, v)\t\tIXDR_PUT_LONG((buf), (v))\n\n Line 290: #define IXDR_PUT_SHORT(buf, v)\t\tIXDR_PUT_LONG((buf), (v))\n\n Line 291: #define IXDR_PUT_U_SHORT(buf, v)\tIXDR_PUT_LONG((buf), (v))\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "todowrite",
"state": {
"status": "completed",
"input": {
"todos": [
{
"content": "Read task.md and guide.md for context",
"status": "completed",
"priority": "high"
},
{
"content": "Read the target chunk (lines 1158-1215) of svc_rpcsec_gss.c",
"status": "completed",
"priority": "high"
},
{
"content": "Read surrounding context in the target file",
"status": "completed",
"priority": "high"
},
{
"content": "Read context files (auth.h, rpc_msg.h)",
"status": "in_progress",
"priority": "high"
},
{
"content": "Trace callers of svc_rpc_gss_validate",
"status": "pending",
"priority": "high"
},
{
"content": "Formulate and test at least 3 attacker-controlled failure hypotheses",
"status": "pending",
"priority": "high"
},
{
"content": "Report findings via StructuredOutput",
"status": "pending",
"priority": "high"
}
]
},
"output": "[\n {\n \"content\": \"Read task.md and guide.md for context\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Read the target chunk (lines 1158-1215) of svc_rpcsec_gss.c\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Read surrounding context in the target file\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Read context files (auth.h, rpc_msg.h)\",\n \"status\": \"in_progress\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Trace callers of svc_rpc_gss_validate\",\n \"status\": \"pending\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Formulate and test at least 3 attacker-controlled failure hypotheses\",\n \"status\": \"pending\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Report findings via StructuredOutput\",\n \"status\": \"pending\",\n \"priority\": \"high\"\n }\n]"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "grep",
"state": {
"status": "completed",
"input": {
"pattern": "MAX_AUTH_BYTES|oa_length|oa_base|opaque_auth",
"path": "freebsd/sys/rpc",
"include": "auth.h"
},
"output": "Found 10 matches\nfreebsd/sys/rpc/auth.h:\n Line 50: #define MAX_AUTH_BYTES\t400\n\n Line 166: struct opaque_auth {\n\n Line 168: \tcaddr_t\toa_base;\t\t/* address of more auth stuff */\n\n Line 169: \tu_int\toa_length;\t\t/* not to exceed MAX_AUTH_BYTES */\n\n Line 178: \tstruct\topaque_auth\tah_cred;\n\n Line 179: \tstruct\topaque_auth\tah_verf;\n\n Line 188: \t\t struct opaque_auth *, struct mbuf **);\n\n Line 204: * struct opaque_auth verf;\n\n Line 222: extern struct opaque_auth _null_auth;\n\n Line 264: extern bool_t xdr_opaque_auth\t\t(XDR *, struct opaque_auth *);\n"
}
},
{
"type": "tool",
"tool": "grep",
"state": {
"status": "completed",
"input": {
"pattern": "RNDUP",
"path": "freebsd/sys/rpc",
"include": "*.h"
},
"output": "Found 1 matches\nfreebsd/sys/rpc/xdr.h:\n Line 90: #define RNDUP(x) ((((x) + BYTES_PER_XDR_UNIT - 1) / BYTES_PER_XDR_UNIT) \\\n"
}
},
{
"type": "tool",
"tool": "grep",
"state": {
"status": "completed",
"input": {
"pattern": "rm_call|cb_cred|cb_verf|rpc_msg",
"path": "freebsd/sys/rpc/rpc_msg.h"
},
"output": "Found 14 matches\nfreebsd/sys/rpc/rpc_msg.h:\n Line 1: /*\t$NetBSD: rpc_msg.h,v 1.11 2000/06/02 22:57:56 fvdl Exp $\t*/\n\n Line 34: * rpc_msg.h\n\n Line 140: \tstruct opaque_auth cb_cred;\n\n Line 141: \tstruct opaque_auth cb_verf; /* protocol specific - provided by client */\n\n Line 147: struct rpc_msg {\n\n Line 154: #define\trm_call\t\tru.RM_cmb\n\n Line 165: * \tstruct rpc_msg *cmsg;\n\n Line 167: extern bool_t\txdr_callmsg(XDR *, struct rpc_msg *);\n\n Line 173: * \tstruct rpc_msg *cmsg;\n\n Line 175: extern bool_t\txdr_callhdr(XDR *, struct rpc_msg *);\n\n Line 181: * \tstruct rpc_msg *rmsg;\n\n Line 183: extern bool_t\txdr_replymsg(XDR *, struct rpc_msg *);\n\n Line 205: * \tstruct rpc_msg *msg;\n\n Line 208: extern enum clnt_stat _seterr_reply(struct rpc_msg *, struct rpc_err *);\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/auth.h",
"offset": 160,
"limit": 20
},
"output": "freebsd/sys/rpc/auth.h\nfile\n\n160: extern bool_t xdr_des_block(XDR *, des_block *);\n161: __END_DECLS\n162: \n163: /*\n164: * Authentication info. Opaque to client.\n165: */\n166: struct opaque_auth {\n167: \tenum_t\toa_flavor;\t\t/* flavor of auth */\n168: \tcaddr_t\toa_base;\t\t/* address of more auth stuff */\n169: \tu_int\toa_length;\t\t/* not to exceed MAX_AUTH_BYTES */\n170: };\n171: \n172: \n173: /*\n174: * Auth handle, interface to client side authenticators.\n175: */\n176: struct rpc_err;\n177: typedef struct __auth {\n178: \tstruct\topaque_auth\tah_cred;\n179: \tstruct\topaque_auth\tah_verf;\n\n(Showing lines 160-179 of 368. Use offset=180 to continue.)\n"
}
},
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/xdr.h",
"offset": 85,
"limit": 10
},
"output": "freebsd/sys/rpc/xdr.h\nfile\n\n85: \n86: /*\n87: * This is the number of bytes per unit of external data.\n88: */\n89: #define BYTES_PER_XDR_UNIT\t(4)\n90: #define RNDUP(x) ((((x) + BYTES_PER_XDR_UNIT - 1) / BYTES_PER_XDR_UNIT) \\\n91: \t\t * BYTES_PER_XDR_UNIT)\n92: \n93: /*\n94: * The XDR handle.\n\n(Showing lines 85-94 of 390. Use offset=95 to continue.)\n"
}
},
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/rpc_msg.h",
"offset": 125,
"limit": 35
},
"output": "freebsd/sys/rpc/rpc_msg.h\nfile\n\n125: \t\tstruct accepted_reply RP_ar;\n126: \t\tstruct rejected_reply RP_dr;\n127: \t} ru;\n128: #define\trp_acpt\tru.RP_ar\n129: #define\trp_rjct\tru.RP_dr\n130: };\n131: \n132: /*\n133: * Body of an rpc request call.\n134: */\n135: struct call_body {\n136: \trpcvers_t cb_rpcvers;\t/* must be equal to two */\n137: \trpcprog_t cb_prog;\n138: \trpcvers_t cb_vers;\n139: \trpcproc_t cb_proc;\n140: \tstruct opaque_auth cb_cred;\n141: \tstruct opaque_auth cb_verf; /* protocol specific - provided by client */\n142: };\n143: \n144: /*\n145: * The rpc message\n146: */\n147: struct rpc_msg {\n148: \tuint32_t\t\trm_xid;\n149: \tenum msg_type\t\trm_direction;\n150: \tunion {\n151: \t\tstruct call_body RM_cmb;\n152: \t\tstruct reply_body RM_rmb;\n153: \t} ru;\n154: #define\trm_call\t\tru.RM_cmb\n155: #define\trm_reply\tru.RM_rmb\n156: };\n157: #define\tacpted_rply\tru.RM_rmb.ru.RP_ar\n158: #define\trjcted_rply\tru.RM_rmb.ru.RP_dr\n159: \n\n(Showing lines 125-159 of 211. Use offset=160 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "todowrite",
"state": {
"status": "completed",
"input": {
"todos": [
{
"content": "Read task.md and guide.md for context",
"status": "completed",
"priority": "high"
},
{
"content": "Read the target chunk (lines 1158-1215) of svc_rpcsec_gss.c",
"status": "completed",
"priority": "high"
},
{
"content": "Read surrounding context in the target file",
"status": "completed",
"priority": "high"
},
{
"content": "Read context files (auth.h, rpc_msg.h)",
"status": "completed",
"priority": "high"
},
{
"content": "Trace callers of svc_rpc_gss_validate",
"status": "in_progress",
"priority": "high"
},
{
"content": "Formulate and test at least 3 attacker-controlled failure hypotheses",
"status": "pending",
"priority": "high"
},
{
"content": "Report findings via StructuredOutput",
"status": "pending",
"priority": "high"
}
]
},
"output": "[\n {\n \"content\": \"Read task.md and guide.md for context\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Read the target chunk (lines 1158-1215) of svc_rpcsec_gss.c\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Read surrounding context in the target file\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Read context files (auth.h, rpc_msg.h)\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Trace callers of svc_rpc_gss_validate\",\n \"status\": \"in_progress\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Formulate and test at least 3 attacker-controlled failure hypotheses\",\n \"status\": \"pending\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Report findings via StructuredOutput\",\n \"status\": \"pending\",\n \"priority\": \"high\"\n }\n]"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c",
"offset": 1539,
"limit": 50
},
"output": "freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c\nfile\n\n1539: \tcase RPCSEC_GSS_DATA:\n1540: \tcase RPCSEC_GSS_DESTROY:\n1541: \t\tif (!svc_rpc_gss_check_replay(client, gc.gc_seq)) {\n1542: \t\t\tresult = RPCSEC_GSS_NODISPATCH;\n1543: \t\t\tbreak;\n1544: \t\t}\n1545: \n1546: \t\tif (!svc_rpc_gss_validate(client, msg, &qop, gc.gc_proc)) {\n1547: \t\t\tresult = RPCSEC_GSS_CREDPROBLEM;\n1548: \t\t\tbreak;\n1549: \t\t}\n1550: \t\t\n1551: \t\t/*\n1552: \t\t * We borrow the space for the call verf to pack our\n1553: \t\t * reply verf.\n1554: \t\t */\n1555: \t\trqst->rq_verf = msg->rm_call.cb_verf;\n1556: \t\tif (!svc_rpc_gss_nextverf(client, rqst, gc.gc_seq)) {\n1557: \t\t\tresult = RPCSEC_GSS_CTXPROBLEM;\n1558: \t\t\tbreak;\n1559: \t\t}\n1560: \n1561: \t\tsvc_rpc_gss_update_seq(client, gc.gc_seq);\n1562: \n1563: \t\t/*\n1564: \t\t * Change the SVCAUTH ops on the request to point at\n1565: \t\t * our own code so that we can unwrap the arguments\n1566: \t\t * and wrap the result. The caller will re-set this on\n1567: \t\t * every request to point to a set of null wrap/unwrap\n1568: \t\t * methods. Acquire an extra reference to the client\n1569: \t\t * which will be released by svc_rpc_gss_release()\n1570: \t\t * after the request has finished processing.\n1571: \t\t */\n1572: \t\trefcount_acquire(&client->cl_refs);\n1573: \t\trqst->rq_auth.svc_ah_ops = &svc_auth_gss_ops;\n1574: \t\trqst->rq_auth.svc_ah_private = cc;\n1575: \n1576: \t\tif (gc.gc_proc == RPCSEC_GSS_DATA) {\n1577: \t\t\t/*\n1578: \t\t\t * We might be ready to do a callback to the server to\n1579: \t\t\t * see if it wants to accept/reject the connection.\n1580: \t\t\t */\n1581: \t\t\tsx_xlock(&client->cl_lock);\n1582: \t\t\tif (!client->cl_done_callback) {\n1583: \t\t\t\tclient->cl_done_callback = TRUE;\n1584: \t\t\t\tclient->cl_qop = qop;\n1585: \t\t\t\tclient->cl_rawcred.qop = _rpc_gss_num_to_qop(\n1586: \t\t\t\t\tclient->cl_rawcred.mechanism, qop);\n1587: \t\t\t\tif (!svc_rpc_gss_callback(client, rqst)) {\n1588: \t\t\t\t\tresult = AUTH_REJECTEDCRED;\n\n(Showing lines 1539-1588 of 1715. Use offset=1589 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c",
"offset": 1388,
"limit": 80
},
"output": "freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c\nfile\n\n1388: enum auth_stat\n1389: svc_rpc_gss(struct svc_req *rqst, struct rpc_msg *msg)\n1390: \n1391: {\n1392: \tOM_uint32\t\t min_stat;\n1393: \tXDR\t \t\t xdrs;\n1394: \tstruct svc_rpc_gss_cookedcred *cc;\n1395: \tstruct svc_rpc_gss_client *client;\n1396: \tstruct rpc_gss_cred\t gc;\n1397: \tstruct rpc_gss_init_res\t gr;\n1398: \tgss_qop_t\t\t qop;\n1399: \tint\t\t\t call_stat;\n1400: \tenum auth_stat\t\t result;\n1401: \t\n1402: \tKGSS_CURVNET_SET_QUIET(KGSS_TD_TO_VNET(curthread));\n1403: \trpc_gss_log_debug(\"in svc_rpc_gss()\");\n1404: \t\n1405: \t/* Garbage collect old clients. */\n1406: \tsvc_rpc_gss_timeout_clients();\n1407: \n1408: \t/* Initialize reply. */\n1409: \trqst->rq_verf = _null_auth;\n1410: \n1411: \t/* Deserialize client credentials. */\n1412: \tif (rqst->rq_cred.oa_length <= 0) {\n1413: \t\tKGSS_CURVNET_RESTORE();\n1414: \t\treturn (AUTH_BADCRED);\n1415: \t}\n1416: \t\n1417: \tmemset(&gc, 0, sizeof(gc));\n1418: \t\n1419: \txdrmem_create(&xdrs, rqst->rq_cred.oa_base,\n1420: \t rqst->rq_cred.oa_length, XDR_DECODE);\n1421: \t\n1422: \tif (!xdr_rpc_gss_cred(&xdrs, &gc)) {\n1423: \t\tXDR_DESTROY(&xdrs);\n1424: \t\tKGSS_CURVNET_RESTORE();\n1425: \t\treturn (AUTH_BADCRED);\n1426: \t}\n1427: \tXDR_DESTROY(&xdrs);\n1428: \n1429: \tclient = NULL;\n1430: \n1431: \t/* Check version. */\n1432: \tif (gc.gc_version != RPCSEC_GSS_VERSION) {\n1433: \t\tresult = AUTH_BADCRED;\n1434: \t\tgoto out;\n1435: \t}\n1436: \n1437: \t/* Check the proc and find the client (or create it) */\n1438: \tif (gc.gc_proc == RPCSEC_GSS_INIT) {\n1439: \t\tif (gc.gc_handle.length != 0) {\n1440: \t\t\tresult = AUTH_BADCRED;\n1441: \t\t\tgoto out;\n1442: \t\t}\n1443: \t\tclient = svc_rpc_gss_create_client();\n1444: \t} else {\n1445: \t\tstruct svc_rpc_gss_clientid *p;\n1446: \t\tif (gc.gc_handle.length != sizeof(*p)) {\n1447: \t\t\tresult = AUTH_BADCRED;\n1448: \t\t\tgoto out;\n1449: \t\t}\n1450: \t\tp = gc.gc_handle.value;\n1451: \t\tclient = svc_rpc_gss_find_client(p);\n1452: \t\tif (!client) {\n1453: \t\t\t/*\n1454: \t\t\t * Can't find the client - we may have\n1455: \t\t\t * destroyed it - tell the other side to\n1456: \t\t\t * re-authenticate.\n1457: \t\t\t */\n1458: \t\t\tresult = RPCSEC_GSS_CREDPROBLEM;\n1459: \t\t\tgoto out;\n1460: \t\t}\n1461: \t}\n1462: \tcc = rqst->rq_clntcred;\n1463: \tcc->cc_client = client;\n1464: \tcc->cc_service = gc.gc_svc;\n1465: \tcc->cc_seq = gc.gc_seq;\n1466: \n1467: \t/*\n\n(Showing lines 1388-1467 of 1715. Use offset=1468 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "todowrite",
"state": {
"status": "completed",
"input": {
"todos": [
{
"content": "Read task.md and guide.md for context",
"status": "completed",
"priority": "high"
},
{
"content": "Read the target chunk (lines 1158-1215) of svc_rpcsec_gss.c",
"status": "completed",
"priority": "high"
},
{
"content": "Read surrounding context in the target file",
"status": "completed",
"priority": "high"
},
{
"content": "Read context files (auth.h, rpc_msg.h)",
"status": "completed",
"priority": "high"
},
{
"content": "Trace callers of svc_rpc_gss_validate",
"status": "completed",
"priority": "high"
},
{
"content": "Formulate and test at least 3 attacker-controlled failure hypotheses",
"status": "in_progress",
"priority": "high"
},
{
"content": "Report findings via StructuredOutput",
"status": "pending",
"priority": "high"
}
]
},
"output": "[\n {\n \"content\": \"Read task.md and guide.md for context\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Read the target chunk (lines 1158-1215) of svc_rpcsec_gss.c\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Read surrounding context in the target file\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Read context files (auth.h, rpc_msg.h)\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Trace callers of svc_rpc_gss_validate\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Formulate and test at least 3 attacker-controlled failure hypotheses\",\n \"status\": \"in_progress\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Report findings via StructuredOutput\",\n \"status\": \"pending\",\n \"priority\": \"high\"\n }\n]"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/auth.h",
"offset": 40,
"limit": 15
},
"output": "freebsd/sys/rpc/auth.h\nfile\n\n40: * \"sessions\".\n41: */\n42: \n43: #ifndef _RPC_AUTH_H\n44: #define _RPC_AUTH_H\n45: #include \n46: #include \n47: #include \n48: #include \n49: \n50: #define MAX_AUTH_BYTES\t400\n51: #define MAXNETNAMELEN\t255\t/* maximum length of network user's name */\n52: \n53: /*\n54: * Client side authentication/security data\n\n(Showing lines 40-54 of 368. Use offset=55 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "grep",
"state": {
"status": "completed",
"input": {
"pattern": "xdr_opaque_auth|oa_length.*MAX_AUTH",
"path": "freebsd/sys/rpc",
"include": "*.c"
},
"output": "Found 20 matches\nfreebsd/sys/rpc/rpcsec_gss/rpcsec_gss.c:\n Line 543: \txdr_opaque_auth(xdrs, &creds);\n\n Line 547: \t\tif (!xdr_opaque_auth(xdrs, &_null_auth)) {\n\n Line 591: \t\txdr_stat = xdr_opaque_auth(xdrs, &verf);\n\n\nfreebsd/sys/rpc/rpcsec_tls/auth_tls.c:\n Line 101: \txdr_opaque_auth(&xdrs, &ap->no_client.ah_cred);\n\n Line 102: \txdr_opaque_auth(&xdrs, &ap->no_client.ah_verf);\n\n\nfreebsd/sys/rpc/rpc_callmsg.c:\n Line 58: \t\tif (cmsg->rm_call.cb_cred.oa_length > MAX_AUTH_BYTES) {\n\n Line 61: \t\tif (cmsg->rm_call.cb_verf.oa_length > MAX_AUTH_BYTES) {\n\n Line 119: \t\t\t\tif (oa->oa_length > MAX_AUTH_BYTES) {\n\n Line 155: \t\t\t\tif (oa->oa_length > MAX_AUTH_BYTES) {\n\n Line 192: \t xdr_opaque_auth(xdrs, &(cmsg->rm_call.cb_cred)) )\n\n Line 193: \t\treturn (xdr_opaque_auth(xdrs, &(cmsg->rm_call.cb_verf)));\n\n\nfreebsd/sys/rpc/rpc_prot.c:\n Line 72: xdr_opaque_auth(XDR *xdrs, struct opaque_auth *ap)\n\n Line 80: \t\t\t&ap->oa_length, MAX_AUTH_BYTES));\n\n Line 100: \tif (! xdr_opaque_auth(xdrs, &(ar->ar_verf)))\n\n\nfreebsd/sys/rpc/auth_unix.c:\n Line 277: \t\tif (xdr_opaque_auth(&txdrs, &au->au_shcred)) {\n\n Line 281: \t\t\t(void)xdr_opaque_auth(&txdrs, &au->au_shcred);\n\n Line 366: \tif ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) ||\n\n Line 367: \t (! xdr_opaque_auth(xdrs, &(auth->ah_verf))))\n\n\nfreebsd/sys/rpc/auth_none.c:\n Line 92: \txdr_opaque_auth(&xdrs, &ap->no_client.ah_cred);\n\n Line 93: \txdr_opaque_auth(&xdrs, &ap->no_client.ah_verf);\n"
}
},
{
"type": "tool",
"tool": "grep",
"state": {
"status": "completed",
"input": {
"pattern": "rq_cred.*oa_length|cb_cred.*oa_length",
"path": "freebsd/sys/rpc",
"include": "*.c"
},
"output": "Found 6 matches\nfreebsd/sys/rpc/svc_auth_unix.c:\n Line 63: \tauth_len = (u_int)msg->rm_call.cb_cred.oa_length;\n\n\nfreebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c:\n Line 1412: \tif (rqst->rq_cred.oa_length <= 0) {\n\n Line 1420: \t rqst->rq_cred.oa_length, XDR_DECODE);\n\n\nfreebsd/sys/rpc/rpcsec_tls/rpctls_impl.c:\n Line 450: \tif (rqst->rq_cred.oa_length != 0 ||\n\n\nfreebsd/sys/rpc/rpc_callmsg.c:\n Line 58: \t\tif (cmsg->rm_call.cb_cred.oa_length > MAX_AUTH_BYTES) {\n\n Line 65: \t\t\t+ RNDUP(cmsg->rm_call.cb_cred.oa_length)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/rpc_callmsg.c",
"offset": 50,
"limit": 40
},
"output": "freebsd/sys/rpc/rpc_callmsg.c\nfile\n\n50: bool_t\n51: xdr_callmsg(XDR *xdrs, struct rpc_msg *cmsg)\n52: {\n53: \tenum msg_type *prm_direction;\n54: \tint32_t *buf;\n55: \tstruct opaque_auth *oa;\n56: \n57: \tif (xdrs->x_op == XDR_ENCODE) {\n58: \t\tif (cmsg->rm_call.cb_cred.oa_length > MAX_AUTH_BYTES) {\n59: \t\t\treturn (FALSE);\n60: \t\t}\n61: \t\tif (cmsg->rm_call.cb_verf.oa_length > MAX_AUTH_BYTES) {\n62: \t\t\treturn (FALSE);\n63: \t\t}\n64: \t\tbuf = XDR_INLINE(xdrs, 8 * BYTES_PER_XDR_UNIT\n65: \t\t\t+ RNDUP(cmsg->rm_call.cb_cred.oa_length)\n66: \t\t\t+ 2 * BYTES_PER_XDR_UNIT\n67: \t\t\t+ RNDUP(cmsg->rm_call.cb_verf.oa_length));\n68: \t\tif (buf != NULL) {\n69: \t\t\tIXDR_PUT_INT32(buf, cmsg->rm_xid);\n70: \t\t\tIXDR_PUT_ENUM(buf, cmsg->rm_direction);\n71: \t\t\tif (cmsg->rm_direction != CALL) {\n72: \t\t\t\treturn (FALSE);\n73: \t\t\t}\n74: \t\t\tIXDR_PUT_INT32(buf, cmsg->rm_call.cb_rpcvers);\n75: \t\t\tif (cmsg->rm_call.cb_rpcvers != RPC_MSG_VERSION) {\n76: \t\t\t\treturn (FALSE);\n77: \t\t\t}\n78: \t\t\tIXDR_PUT_INT32(buf, cmsg->rm_call.cb_prog);\n79: \t\t\tIXDR_PUT_INT32(buf, cmsg->rm_call.cb_vers);\n80: \t\t\tIXDR_PUT_INT32(buf, cmsg->rm_call.cb_proc);\n81: \t\t\toa = &cmsg->rm_call.cb_cred;\n82: \t\t\tIXDR_PUT_ENUM(buf, oa->oa_flavor);\n83: \t\t\tIXDR_PUT_INT32(buf, oa->oa_length);\n84: \t\t\tif (oa->oa_length) {\n85: \t\t\t\tmemcpy(buf, oa->oa_base, oa->oa_length);\n86: \t\t\t\tbuf += RNDUP(oa->oa_length) / sizeof (int32_t);\n87: \t\t\t}\n88: \t\t\toa = &cmsg->rm_call.cb_verf;\n89: \t\t\tIXDR_PUT_ENUM(buf, oa->oa_flavor);\n\n(Showing lines 50-89 of 195. Use offset=90 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/rpc_callmsg.c",
"offset": 90,
"limit": 70
},
"output": "freebsd/sys/rpc/rpc_callmsg.c\nfile\n\n90: \t\t\tIXDR_PUT_INT32(buf, oa->oa_length);\n91: \t\t\tif (oa->oa_length) {\n92: \t\t\t\tmemcpy(buf, oa->oa_base, oa->oa_length);\n93: \t\t\t\t/* no real need....\n94: \t\t\t\tbuf += RNDUP(oa->oa_length) / sizeof (int32_t);\n95: \t\t\t\t*/\n96: \t\t\t}\n97: \t\t\treturn (TRUE);\n98: \t\t}\n99: \t}\n100: \tif (xdrs->x_op == XDR_DECODE) {\n101: \t\tbuf = XDR_INLINE(xdrs, 8 * BYTES_PER_XDR_UNIT);\n102: \t\tif (buf != NULL) {\n103: \t\t\tcmsg->rm_xid = IXDR_GET_UINT32(buf);\n104: \t\t\tcmsg->rm_direction = IXDR_GET_ENUM(buf, enum msg_type);\n105: \t\t\tif (cmsg->rm_direction != CALL) {\n106: \t\t\t\treturn (FALSE);\n107: \t\t\t}\n108: \t\t\tcmsg->rm_call.cb_rpcvers = IXDR_GET_UINT32(buf);\n109: \t\t\tif (cmsg->rm_call.cb_rpcvers != RPC_MSG_VERSION) {\n110: \t\t\t\treturn (FALSE);\n111: \t\t\t}\n112: \t\t\tcmsg->rm_call.cb_prog = IXDR_GET_UINT32(buf);\n113: \t\t\tcmsg->rm_call.cb_vers = IXDR_GET_UINT32(buf);\n114: \t\t\tcmsg->rm_call.cb_proc = IXDR_GET_UINT32(buf);\n115: \t\t\toa = &cmsg->rm_call.cb_cred;\n116: \t\t\toa->oa_flavor = IXDR_GET_ENUM(buf, enum_t);\n117: \t\t\toa->oa_length = (u_int)IXDR_GET_UINT32(buf);\n118: \t\t\tif (oa->oa_length) {\n119: \t\t\t\tif (oa->oa_length > MAX_AUTH_BYTES) {\n120: \t\t\t\t\treturn (FALSE);\n121: \t\t\t\t}\n122: \t\t\t\tif (oa->oa_base == NULL) {\n123: \t\t\t\t\toa->oa_base = (caddr_t)\n124: \t\t\t\t\t mem_alloc(oa->oa_length);\n125: \t\t\t\t\tif (oa->oa_base == NULL)\n126: \t\t\t\t\t\treturn (FALSE);\n127: \t\t\t\t}\n128: \t\t\t\tbuf = XDR_INLINE(xdrs, RNDUP(oa->oa_length));\n129: \t\t\t\tif (buf == NULL) {\n130: \t\t\t\t\tif (xdr_opaque(xdrs, oa->oa_base,\n131: \t\t\t\t\t oa->oa_length) == FALSE) {\n132: \t\t\t\t\t\treturn (FALSE);\n133: \t\t\t\t\t}\n134: \t\t\t\t} else {\n135: \t\t\t\t\tmemcpy(oa->oa_base, buf,\n136: \t\t\t\t\t oa->oa_length);\n137: \t\t\t\t\t/* no real need....\n138: \t\t\t\t\tbuf += RNDUP(oa->oa_length) /\n139: \t\t\t\t\t\tsizeof (int32_t);\n140: \t\t\t\t\t*/\n141: \t\t\t\t}\n142: \t\t\t}\n143: \t\t\toa = &cmsg->rm_call.cb_verf;\n144: \t\t\tbuf = XDR_INLINE(xdrs, 2 * BYTES_PER_XDR_UNIT);\n145: \t\t\tif (buf == NULL) {\n146: \t\t\t\tif (xdr_enum(xdrs, &oa->oa_flavor) == FALSE ||\n147: \t\t\t\t xdr_u_int(xdrs, &oa->oa_length) == FALSE) {\n148: \t\t\t\t\treturn (FALSE);\n149: \t\t\t\t}\n150: \t\t\t} else {\n151: \t\t\t\toa->oa_flavor = IXDR_GET_ENUM(buf, enum_t);\n152: \t\t\t\toa->oa_length = (u_int)IXDR_GET_UINT32(buf);\n153: \t\t\t}\n154: \t\t\tif (oa->oa_length) {\n155: \t\t\t\tif (oa->oa_length > MAX_AUTH_BYTES) {\n156: \t\t\t\t\treturn (FALSE);\n157: \t\t\t\t}\n158: \t\t\t\tif (oa->oa_base == NULL) {\n159: \t\t\t\t\toa->oa_base = (caddr_t)\n\n(Showing lines 90-159 of 195. Use offset=160 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "grep",
"state": {
"status": "completed",
"input": {
"pattern": "rq_cred|rq_credarea",
"path": "freebsd/sys/rpc/svc.h"
},
"output": "Found 2 matches\nfreebsd/sys/rpc/svc.h:\n Line 218: \tstruct opaque_auth rq_cred;\t/* raw creds from the wire */\n\n Line 228: \tchar\t\trq_credarea[3*MAX_AUTH_BYTES];\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/svc.h",
"offset": 215,
"limit": 20
},
"output": "freebsd/sys/rpc/svc.h\nfile\n\n215: \tuint32_t\trq_proc;\t/* the desired procedure */\n216: \tsize_t\t\trq_size;\t/* space used by request */\n217: \tstruct mbuf\t*rq_args;\t/* XDR-encoded procedure arguments */\n218: \tstruct opaque_auth rq_cred;\t/* raw creds from the wire */\n219: \tstruct opaque_auth rq_verf;\t/* verifier for the reply */\n220: \tvoid\t\t*rq_clntcred;\t/* read only cooked cred */\n221: \tSVCAUTH\t\trq_auth;\t/* interface to auth methods */\n222: \tSVCXPRT\t\t*rq_xprt;\t/* associated transport */\n223: \tstruct sockaddr\t*rq_addr;\t/* reply address or NULL if connected */\n224: \tvoid\t\t*rq_p1;\t\t/* application workspace */\n225: \tint\t\trq_p2;\t\t/* application workspace */\n226: \tuint64_t\trq_p3;\t\t/* application workspace */\n227: \tuint32_t\trq_reply_seq;\t/* reply socket sequence # */\n228: \tchar\t\trq_credarea[3*MAX_AUTH_BYTES];\n229: };\n230: STAILQ_HEAD(svc_reqlist, svc_req);\n231: \n232: #define svc_getrpccaller(rq)\t\t\t\t\t\\\n233: \t((rq)->rq_addr ? (rq)->rq_addr :\t\t\t\\\n234: \t (struct sockaddr *) &(rq)->rq_xprt->xp_rtaddr)\n\n(Showing lines 215-234 of 631. Use offset=235 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "grep",
"state": {
"status": "completed",
"input": {
"pattern": "rq_clntcred.*=|rq_cred\\.oa_base|rq_credarea",
"path": "freebsd/sys/rpc",
"include": "*.c"
},
"output": "Found 4 matches\nfreebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c:\n Line 1419: \txdrmem_create(&xdrs, rqst->rq_cred.oa_base,\n\n\nfreebsd/sys/rpc/svc.c:\n Line 932: \tmsg.rm_call.cb_cred.oa_base = r->rq_credarea;\n\n Line 933: \tmsg.rm_call.cb_verf.oa_base = &r->rq_credarea[MAX_AUTH_BYTES];\n\n Line 934: \tr->rq_clntcred = &r->rq_credarea[2*MAX_AUTH_BYTES];\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/svc.c",
"offset": 925,
"limit": 20
},
"output": "freebsd/sys/rpc/svc.c\nfile\n\n925: \tstruct mbuf *args;\n926: \tstruct svc_loss_callout *s;\n927: \tenum xprt_stat stat;\n928: \n929: \t/* now receive msgs from xprtprt (support batch calls) */\n930: \tr = malloc(sizeof(*r), M_RPC, M_WAITOK|M_ZERO);\n931: \n932: \tmsg.rm_call.cb_cred.oa_base = r->rq_credarea;\n933: \tmsg.rm_call.cb_verf.oa_base = &r->rq_credarea[MAX_AUTH_BYTES];\n934: \tr->rq_clntcred = &r->rq_credarea[2*MAX_AUTH_BYTES];\n935: \tif (SVC_RECV(xprt, &msg, &r->rq_addr, &args)) {\n936: \t\tenum auth_stat why;\n937: \n938: \t\t/*\n939: \t\t * Handle replays and authenticate before queuing the\n940: \t\t * request to be executed.\n941: \t\t */\n942: \t\tSVC_ACQUIRE(xprt);\n943: \t\tr->rq_xprt = xprt;\n944: \t\tif (pool->sp_rcache) {\n\n(Showing lines 925-944 of 1498. Use offset=945 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "todowrite",
"state": {
"status": "completed",
"input": {
"todos": [
{
"content": "Read task.md and guide.md for context",
"status": "completed",
"priority": "high"
},
{
"content": "Read the target chunk (lines 1158-1215) of svc_rpcsec_gss.c",
"status": "completed",
"priority": "high"
},
{
"content": "Read surrounding context in the target file",
"status": "completed",
"priority": "high"
},
{
"content": "Read context files (auth.h, rpc_msg.h)",
"status": "completed",
"priority": "high"
},
{
"content": "Trace callers of svc_rpc_gss_validate",
"status": "completed",
"priority": "high"
},
{
"content": "Formulate and test at least 3 attacker-controlled failure hypotheses",
"status": "in_progress",
"priority": "high"
},
{
"content": "Report findings via StructuredOutput",
"status": "pending",
"priority": "high"
}
]
},
"output": "[\n {\n \"content\": \"Read task.md and guide.md for context\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Read the target chunk (lines 1158-1215) of svc_rpcsec_gss.c\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Read surrounding context in the target file\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Read context files (auth.h, rpc_msg.h)\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Trace callers of svc_rpc_gss_validate\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Formulate and test at least 3 attacker-controlled failure hypotheses\",\n \"status\": \"in_progress\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Report findings via StructuredOutput\",\n \"status\": \"pending\",\n \"priority\": \"high\"\n }\n]"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/xdr.h",
"offset": 275,
"limit": 20
},
"output": "freebsd/sys/rpc/xdr.h\nfile\n\n275: #define IXDR_GET_UINT32(buf)\t\t((uint32_t)IXDR_GET_INT32(buf))\n276: #define IXDR_PUT_UINT32(buf, v)\t\tIXDR_PUT_INT32((buf), ((int32_t)(v)))\n277: \n278: #define IXDR_GET_LONG(buf)\t\t((long)__ntohl((uint32_t)*(buf)++))\n279: #define IXDR_PUT_LONG(buf, v)\t\t(*(buf)++ =(int32_t)__htonl((uint32_t)v))\n280: \n281: #define IXDR_GET_BOOL(buf)\t\t((bool_t)IXDR_GET_LONG(buf))\n282: #define IXDR_GET_ENUM(buf, t)\t\t((t)IXDR_GET_LONG(buf))\n283: #define IXDR_GET_U_LONG(buf)\t\t((u_long)IXDR_GET_LONG(buf))\n284: #define IXDR_GET_SHORT(buf)\t\t((short)IXDR_GET_LONG(buf))\n285: #define IXDR_GET_U_SHORT(buf)\t\t((u_short)IXDR_GET_LONG(buf))\n286: \n287: #define IXDR_PUT_BOOL(buf, v)\t\tIXDR_PUT_LONG((buf), (v))\n288: #define IXDR_PUT_ENUM(buf, v)\t\tIXDR_PUT_LONG((buf), (v))\n289: #define IXDR_PUT_U_LONG(buf, v)\t\tIXDR_PUT_LONG((buf), (v))\n290: #define IXDR_PUT_SHORT(buf, v)\t\tIXDR_PUT_LONG((buf), (v))\n291: #define IXDR_PUT_U_SHORT(buf, v)\tIXDR_PUT_LONG((buf), (v))\n292: \n293: /*\n294: * These are the \"generic\" xdr routines.\n\n(Showing lines 275-294 of 390. Use offset=295 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "grep",
"state": {
"status": "completed",
"input": {
"pattern": "rq_cred\\b",
"path": "freebsd/sys/rpc/svc.c"
},
"output": "No files found"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "grep",
"state": {
"status": "completed",
"input": {
"pattern": "rq_cred",
"path": "freebsd/sys/rpc/svc.c"
},
"output": "Found 3 matches\nfreebsd/sys/rpc/svc.c:\n Line 932: \tmsg.rm_call.cb_cred.oa_base = r->rq_credarea;\n\n Line 933: \tmsg.rm_call.cb_verf.oa_base = &r->rq_credarea[MAX_AUTH_BYTES];\n\n Line 934: \tr->rq_clntcred = &r->rq_credarea[2*MAX_AUTH_BYTES];\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "grep",
"state": {
"status": "completed",
"input": {
"pattern": "rq_cred",
"path": "freebsd/sys/rpc",
"include": "*.c"
},
"output": "Found 12 matches\nfreebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c:\n Line 496: \tif (req->rq_cred.oa_flavor != RPCSEC_GSS)\n\n Line 522: \tif (req->rq_cred.oa_flavor != RPCSEC_GSS)\n\n Line 1412: \tif (rqst->rq_cred.oa_length <= 0) {\n\n Line 1419: \txdrmem_create(&xdrs, rqst->rq_cred.oa_base,\n\n Line 1420: \t rqst->rq_cred.oa_length, XDR_DECODE);\n\n\nfreebsd/sys/rpc/svc_auth.c:\n Line 84: \trqst->rq_cred = msg->rm_call.cb_cred;\n\n Line 87: \tcred_flavor = rqst->rq_cred.oa_flavor;\n\n Line 179: \tflavor = rqst->rq_cred.oa_flavor;\n\n\nfreebsd/sys/rpc/rpcsec_tls/rpctls_impl.c:\n Line 450: \tif (rqst->rq_cred.oa_length != 0 ||\n\n\nfreebsd/sys/rpc/svc.c:\n Line 932: \tmsg.rm_call.cb_cred.oa_base = r->rq_credarea;\n\n Line 933: \tmsg.rm_call.cb_verf.oa_base = &r->rq_credarea[MAX_AUTH_BYTES];\n\n Line 934: \tr->rq_clntcred = &r->rq_credarea[2*MAX_AUTH_BYTES];\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/svc_auth.c",
"offset": 75,
"limit": 30
},
"output": "freebsd/sys/rpc/svc_auth.c\nfile\n\n75: * There is an assumption that any flavour less than AUTH_NULL is\n76: * invalid.\n77: */\n78: enum auth_stat\n79: _authenticate(struct svc_req *rqst, struct rpc_msg *msg)\n80: {\n81: \tint cred_flavor;\n82: \tenum auth_stat dummy;\n83: \n84: \trqst->rq_cred = msg->rm_call.cb_cred;\n85: \trqst->rq_auth.svc_ah_ops = &svc_auth_null_ops;\n86: \trqst->rq_auth.svc_ah_private = NULL;\n87: \tcred_flavor = rqst->rq_cred.oa_flavor;\n88: \tswitch (cred_flavor) {\n89: \tcase AUTH_NULL:\n90: \t\tdummy = _svcauth_null(rqst, msg);\n91: \t\treturn (dummy);\n92: \tcase AUTH_SYS:\n93: \t\tif ((rqst->rq_xprt->xp_tls & RPCTLS_FLAGS_DISABLED) != 0)\n94: \t\t\treturn (AUTH_REJECTEDCRED);\n95: \t\tdummy = _svcauth_unix(rqst, msg);\n96: \t\treturn (dummy);\n97: \tcase AUTH_SHORT:\n98: \t\tif ((rqst->rq_xprt->xp_tls & RPCTLS_FLAGS_DISABLED) != 0)\n99: \t\t\treturn (AUTH_REJECTEDCRED);\n100: \t\tdummy = _svcauth_short(rqst, msg);\n101: \t\treturn (dummy);\n102: \tcase RPCSEC_GSS:\n103: \t\tif ((rqst->rq_xprt->xp_tls & RPCTLS_FLAGS_DISABLED) != 0)\n104: \t\t\treturn (AUTH_REJECTEDCRED);\n\n(Showing lines 75-104 of 226. Use offset=105 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/svc_auth.c",
"offset": 105,
"limit": 30
},
"output": "freebsd/sys/rpc/svc_auth.c\nfile\n\n105: \t\tif (!_svcauth_rpcsec_gss)\n106: \t\t\treturn (AUTH_REJECTEDCRED);\n107: \t\tdummy = _svcauth_rpcsec_gss(rqst, msg);\n108: \t\treturn (dummy);\n109: \tcase AUTH_TLS:\n110: \t\tdummy = _svcauth_rpcsec_tls(rqst, msg);\n111: \t\treturn (dummy);\n112: \tdefault:\n113: \t\tbreak;\n114: \t}\n115: \n116: \treturn (AUTH_REJECTEDCRED);\n117: }\n118: \n119: /*\n120: * A set of null auth methods used by any authentication protocols\n121: * that don't need to inspect or modify the message body.\n122: */\n123: static bool_t\n124: svcauth_null_wrap(SVCAUTH *auth, struct mbuf **mp)\n125: {\n126: \n127: \treturn (TRUE);\n128: }\n129: \n130: static bool_t\n131: svcauth_null_unwrap(SVCAUTH *auth, struct mbuf **mp)\n132: {\n133: \n134: \treturn (TRUE);\n\n(Showing lines 105-134 of 226. Use offset=135 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/rpcsec_gss/rpcsec_gss_prot.c",
"offset": 1,
"limit": 50
},
"output": "freebsd/sys/rpc/rpcsec_gss/rpcsec_gss_prot.c\nfile\n\n1: /*\n2: rpcsec_gss_prot.c\n3: \n4: SPDX-License-Identifier: BSD-3-Clause\n5: \n6: Copyright (c) 2000 The Regents of the University of Michigan.\n7: All rights reserved.\n8: \n9: Copyright (c) 2000 Dug Song .\n10: All rights reserved, all wrongs reversed.\n11: \n12: Redistribution and use in source and binary forms, with or without\n13: modification, are permitted provided that the following conditions\n14: are met:\n15: \n16: 1. Redistributions of source code must retain the above copyright\n17: notice, this list of conditions and the following disclaimer.\n18: 2. Redistributions in binary form must reproduce the above copyright\n19: notice, this list of conditions and the following disclaimer in the\n20: documentation and/or other materials provided with the distribution.\n21: 3. Neither the name of the University nor the names of its\n22: contributors may be used to endorse or promote products derived\n23: from this software without specific prior written permission.\n24: \n25: THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED\n26: WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF\n27: MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE\n28: DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE\n29: FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR\n30: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF\n31: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR\n32: BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF\n33: LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING\n34: NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS\n35: SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n36: \n37: $Id: authgss_prot.c,v 1.18 2000/09/01 04:14:03 dugsong Exp $\n38: */\n39: \n40: #include \n41: #include \n42: #include \n43: #include \n44: #include \n45: #include \n46: #include \n47: \n48: #include \n49: #include \n50: \n\n(Showing lines 1-50 of 373. Use offset=51 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "grep",
"state": {
"status": "completed",
"input": {
"pattern": "xdr_rpc_gss_cred",
"path": "freebsd/sys/rpc/rpcsec_gss/rpcsec_gss_prot.c"
},
"output": "Found 1 matches\nfreebsd/sys/rpc/rpcsec_gss/rpcsec_gss_prot.c:\n Line 74: xdr_rpc_gss_cred(XDR *xdrs, struct rpc_gss_cred *p)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/rpcsec_gss/rpcsec_gss_prot.c",
"offset": 74,
"limit": 30
},
"output": "freebsd/sys/rpc/rpcsec_gss/rpcsec_gss_prot.c\nfile\n\n74: xdr_rpc_gss_cred(XDR *xdrs, struct rpc_gss_cred *p)\n75: {\n76: \tenum_t proc, svc;\n77: \tbool_t ret;\n78: \n79: \tproc = p->gc_proc;\n80: \tsvc = p->gc_svc;\n81: \tret = (xdr_u_int(xdrs, &p->gc_version) &&\n82: \t xdr_enum(xdrs, &proc) &&\n83: \t xdr_u_int(xdrs, &p->gc_seq) &&\n84: \t xdr_enum(xdrs, &svc) &&\n85: \t xdr_gss_buffer_desc(xdrs, &p->gc_handle));\n86: \tp->gc_proc = proc;\n87: \tp->gc_svc = svc;\n88: \n89: \treturn (ret);\n90: }\n91: \n92: bool_t\n93: xdr_rpc_gss_init_res(XDR *xdrs, struct rpc_gss_init_res *p)\n94: {\n95: \n96: \treturn (xdr_gss_buffer_desc(xdrs, &p->gr_handle) &&\n97: \t xdr_u_int(xdrs, &p->gr_major) &&\n98: \t xdr_u_int(xdrs, &p->gr_minor) &&\n99: \t xdr_u_int(xdrs, &p->gr_win) &&\n100: \t xdr_gss_buffer_desc(xdrs, &p->gr_token));\n101: }\n102: \n103: static void\n\n(Showing lines 74-103 of 373. Use offset=104 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "grep",
"state": {
"status": "completed",
"input": {
"pattern": "xdr_gss_buffer_desc",
"path": "freebsd/sys/rpc/rpcsec_gss/rpcsec_gss_prot.c"
},
"output": "Found 4 matches\nfreebsd/sys/rpc/rpcsec_gss/rpcsec_gss_prot.c:\n Line 57: xdr_gss_buffer_desc(XDR *xdrs, gss_buffer_desc *p)\n\n Line 85: \t xdr_gss_buffer_desc(xdrs, &p->gc_handle));\n\n Line 96: \treturn (xdr_gss_buffer_desc(xdrs, &p->gr_handle) &&\n\n Line 100: \t xdr_gss_buffer_desc(xdrs, &p->gr_token));\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/rpcsec_gss/rpcsec_gss_prot.c",
"offset": 57,
"limit": 17
},
"output": "freebsd/sys/rpc/rpcsec_gss/rpcsec_gss_prot.c\nfile\n\n57: xdr_gss_buffer_desc(XDR *xdrs, gss_buffer_desc *p)\n58: {\n59: \tchar *val;\n60: \tu_int len;\n61: \tbool_t ret;\n62: \n63: \tval = p->value;\n64: \tlen = p->length;\n65: \tret = xdr_bytes(xdrs, &val, &len, MAX_GSS_SIZE);\n66: \tp->value = val;\n67: \tp->length = len;\n68: \n69: \treturn (ret);\n70: }\n71: #endif\n72: \n73: bool_t\n\n(Showing lines 57-73 of 373. Use offset=74 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "grep",
"state": {
"status": "completed",
"input": {
"pattern": "MAX_GSS_SIZE",
"path": "freebsd/sys/rpc/rpcsec_gss"
},
"output": "Found 2 matches\nfreebsd/sys/rpc/rpcsec_gss/rpcsec_gss_prot.c:\n Line 53: #define MAX_GSS_SIZE\t10240\t/* XXX */\n\n Line 65: \tret = xdr_bytes(xdrs, &val, &len, MAX_GSS_SIZE);\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c",
"offset": 1466,
"limit": 30
},
"output": "freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c\nfile\n\n1466: \n1467: \t/*\n1468: \t * The service and sequence number must be ignored for\n1469: \t * RPCSEC_GSS_INIT and RPCSEC_GSS_CONTINUE_INIT.\n1470: \t */\n1471: \tif (gc.gc_proc != RPCSEC_GSS_INIT\n1472: \t && gc.gc_proc != RPCSEC_GSS_CONTINUE_INIT) {\n1473: \t\t/*\n1474: \t\t * Check for sequence number overflow.\n1475: \t\t */\n1476: \t\tif (gc.gc_seq >= MAXSEQ) {\n1477: \t\t\tresult = RPCSEC_GSS_CTXPROBLEM;\n1478: \t\t\tgoto out;\n1479: \t\t}\n1480: \n1481: \t\t/*\n1482: \t\t * Check for valid service.\n1483: \t\t */\n1484: \t\tif (gc.gc_svc != rpc_gss_svc_none &&\n1485: \t\t gc.gc_svc != rpc_gss_svc_integrity &&\n1486: \t\t gc.gc_svc != rpc_gss_svc_privacy) {\n1487: \t\t\tresult = AUTH_BADCRED;\n1488: \t\t\tgoto out;\n1489: \t\t}\n1490: \t}\n1491: \n1492: \t/* Handle RPCSEC_GSS control procedure. */\n1493: \tswitch (gc.gc_proc) {\n1494: \n1495: \tcase RPCSEC_GSS_INIT:\n\n(Showing lines 1466-1495 of 1715. Use offset=1496 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/rpcsec_gss/rpcsec_gss_int.h",
"offset": 1,
"limit": 100
},
"output": "freebsd/sys/rpc/rpcsec_gss/rpcsec_gss_int.h\nfile\n\n1: /*\n2: rpcsec_gss.h\n3: \n4: SPDX-License-Identifier: BSD-3-Clause\n5: \n6: Copyright (c) 2000 The Regents of the University of Michigan.\n7: All rights reserved.\n8: \n9: Copyright (c) 2000 Dug Song .\n10: All rights reserved, all wrongs reversed.\n11: \n12: Redistribution and use in source and binary forms, with or without\n13: modification, are permitted provided that the following conditions\n14: are met:\n15: \n16: 1. Redistributions of source code must retain the above copyright\n17: notice, this list of conditions and the following disclaimer.\n18: 2. Redistributions in binary form must reproduce the above copyright\n19: notice, this list of conditions and the following disclaimer in the\n20: documentation and/or other materials provided with the distribution.\n21: 3. Neither the name of the University nor the names of its\n22: contributors may be used to endorse or promote products derived\n23: from this software without specific prior written permission.\n24: \n25: THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED\n26: WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF\n27: MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE\n28: DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE\n29: FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR\n30: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF\n31: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR\n32: BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF\n33: LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING\n34: NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS\n35: SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n36: \n37: $Id: auth_gss.h,v 1.12 2001/04/30 19:44:47 andros Exp $\n38: */\n39: \n40: #ifndef _RPCSEC_GSS_INT_H\n41: #define _RPCSEC_GSS_INT_H\n42: \n43: #include \n44: \n45: /* RPCSEC_GSS control procedures. */\n46: typedef enum {\n47: \tRPCSEC_GSS_DATA = 0,\n48: \tRPCSEC_GSS_INIT = 1,\n49: \tRPCSEC_GSS_CONTINUE_INIT = 2,\n50: \tRPCSEC_GSS_DESTROY = 3\n51: } rpc_gss_proc_t;\n52: \n53: #define RPCSEC_GSS_VERSION\t1\n54: \n55: /* Credentials. */\n56: struct rpc_gss_cred {\n57: \tu_int\t\tgc_version;\t/* version */\n58: \trpc_gss_proc_t\tgc_proc;\t/* control procedure */\n59: \tu_int\t\tgc_seq;\t\t/* sequence number */\n60: \trpc_gss_service_t gc_svc;\t/* service */\n61: \tgss_buffer_desc\tgc_handle;\t/* handle to server-side context */\n62: };\n63: \n64: /* Context creation response. */\n65: struct rpc_gss_init_res {\n66: \tgss_buffer_desc\tgr_handle;\t/* handle to server-side context */\n67: \tu_int\t\tgr_major;\t/* major status */\n68: \tu_int\t\tgr_minor;\t/* minor status */\n69: \tu_int\t\tgr_win;\t\t/* sequence window */\n70: \tgss_buffer_desc\tgr_token;\t/* token */\n71: };\n72: \n73: /* Maximum sequence number value. */\n74: #define MAXSEQ\t\t0x80000000\n75: \n76: enum krb_imp {\n77: \tKRBIMP_UNKNOWN,\n78: \tKRBIMP_HEIMDALV1,\n79: \tKRBIMP_MIT\n80: };\n81: \n82: /* Prototypes. */\n83: __BEGIN_DECLS\n84: \n85: bool_t\txdr_rpc_gss_cred(XDR *xdrs, struct rpc_gss_cred *p);\n86: bool_t\txdr_rpc_gss_init_res(XDR *xdrs, struct rpc_gss_init_res *p);\n87: bool_t xdr_rpc_gss_wrap_data(struct mbuf **argsp,\n88: gss_ctx_id_t ctx, gss_qop_t qop, rpc_gss_service_t svc,\n89: u_int seq);\n90: bool_t xdr_rpc_gss_unwrap_data(struct mbuf **resultsp,\n91: gss_ctx_id_t ctx, gss_qop_t qop, rpc_gss_service_t svc, u_int seq);\n92: const char *_rpc_gss_num_to_qop(const char *mech, u_int num);\n93: void\t_rpc_gss_set_error(int rpc_gss_error, int system_error);\n94: \n95: void\trpc_gss_log_debug(const char *fmt, ...);\n96: void\trpc_gss_log_status(const char *m, gss_OID mech, OM_uint32 major,\n97: OM_uint32 minor);\n98: \n99: __END_DECLS\n100: \n\n(Showing lines 1-100 of 101. Use offset=101 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c",
"offset": 1130,
"limit": 30
},
"output": "freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c\nfile\n\n1130: \t\t/*\n1131: \t\t * Use gss_pname_to_uid to map to unix creds. For\n1132: \t\t * kerberos5, this uses krb5_aname_to_localname.\n1133: \t\t */\n1134: \t\tif (my_krb_imp != KRBIMP_MIT)\n1135: \t\t\tsvc_rpc_gss_build_ucred(client, client->cl_cname);\n1136: \t\tsvc_rpc_gss_set_flavor(client);\n1137: \t\tgss_release_name(&min_stat, &client->cl_cname);\n1138: \n1139: #ifdef DEBUG\n1140: \t\t{\n1141: \t\t\tgss_buffer_desc mechname;\n1142: \n1143: \t\t\tgss_oid_to_str(&min_stat, mech, &mechname);\n1144: \t\t\t\n1145: \t\t\trpc_gss_log_debug(\"accepted context for %s with \"\n1146: \t\t\t \"\",\n1147: \t\t\t client->cl_rawcred.client_principal->name,\n1148: \t\t\t mechname.length, (char *)mechname.value,\n1149: \t\t\t client->cl_qop, client->cl_rawcred.service);\n1150: \n1151: \t\t\tgss_release_buffer(&min_stat, &mechname);\n1152: \t\t}\n1153: #endif /* DEBUG */\n1154: \t}\n1155: \treturn (TRUE);\n1156: }\n1157: \n1158: static bool_t\n1159: svc_rpc_gss_validate(struct svc_rpc_gss_client *client, struct rpc_msg *msg,\n\n(Showing lines 1130-1159 of 1715. Use offset=1160 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c",
"offset": 1215,
"limit": 40
},
"output": "freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c\nfile\n\n1215: }\n1216: \n1217: static bool_t\n1218: svc_rpc_gss_nextverf(struct svc_rpc_gss_client *client,\n1219: struct svc_req *rqst, u_int seq)\n1220: {\n1221: \tgss_buffer_desc\t\tsignbuf;\n1222: \tgss_buffer_desc\t\tmic;\n1223: \tOM_uint32\t\tmaj_stat, min_stat;\n1224: \tuint32_t\t\tnseq; \n1225: \n1226: \trpc_gss_log_debug(\"in svc_rpc_gss_nextverf()\");\n1227: \n1228: \tnseq = htonl(seq);\n1229: \tsignbuf.value = &nseq;\n1230: \tsignbuf.length = sizeof(nseq);\n1231: \n1232: \tmaj_stat = gss_get_mic(&min_stat, client->cl_ctx, client->cl_qop,\n1233: \t &signbuf, &mic);\n1234: \n1235: \tif (maj_stat != GSS_S_COMPLETE) {\n1236: \t\trpc_gss_log_status(\"gss_get_mic\", client->cl_mech, maj_stat, min_stat);\n1237: \t\tclient->cl_state = CLIENT_STALE;\n1238: \t\treturn (FALSE);\n1239: \t}\n1240: \n1241: \tKASSERT(mic.length <= MAX_AUTH_BYTES,\n1242: \t (\"MIC too large for RPCSEC_GSS\"));\n1243: \n1244: \trqst->rq_verf.oa_flavor = RPCSEC_GSS;\n1245: \trqst->rq_verf.oa_length = mic.length;\n1246: \tbcopy(mic.value, rqst->rq_verf.oa_base, mic.length);\n1247: \n1248: \tgss_release_buffer(&min_stat, &mic);\n1249: \t\n1250: \treturn (TRUE);\n1251: }\n1252: \n1253: static bool_t\n1254: svc_rpc_gss_callback(struct svc_rpc_gss_client *client, struct svc_req *rqst)\n\n(Showing lines 1215-1254 of 1715. Use offset=1255 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "todowrite",
"state": {
"status": "completed",
"input": {
"todos": [
{
"content": "Read task.md and guide.md for context",
"status": "completed",
"priority": "high"
},
{
"content": "Read the target chunk (lines 1158-1215) of svc_rpcsec_gss.c",
"status": "completed",
"priority": "high"
},
{
"content": "Read surrounding context in the target file",
"status": "completed",
"priority": "high"
},
{
"content": "Read context files (auth.h, rpc_msg.h)",
"status": "completed",
"priority": "high"
},
{
"content": "Trace callers of svc_rpc_gss_validate",
"status": "completed",
"priority": "high"
},
{
"content": "Formulate and test at least 3 attacker-controlled failure hypotheses",
"status": "in_progress",
"priority": "high"
},
{
"content": "Report findings via StructuredOutput",
"status": "pending",
"priority": "high"
}
]
},
"output": "[\n {\n \"content\": \"Read task.md and guide.md for context\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Read the target chunk (lines 1158-1215) of svc_rpcsec_gss.c\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Read surrounding context in the target file\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Read context files (auth.h, rpc_msg.h)\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Trace callers of svc_rpc_gss_validate\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Formulate and test at least 3 attacker-controlled failure hypotheses\",\n \"status\": \"in_progress\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Report findings via StructuredOutput\",\n \"status\": \"pending\",\n \"priority\": \"high\"\n }\n]"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "grep",
"state": {
"status": "completed",
"input": {
"pattern": "svc_rpc_gss_callback",
"path": "freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c"
},
"output": "Found 16 matches\nfreebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c:\n Line 98: struct svc_rpc_gss_callback {\n\n Line 99: \tSLIST_ENTRY(svc_rpc_gss_callback) cb_link;\n\n Line 102: SLIST_HEAD(svc_rpc_gss_callback_list, svc_rpc_gss_callback);\n\n Line 103: KGSS_VNET_DEFINE_STATIC(struct svc_rpc_gss_callback_list,\n\n Line 104: svc_rpc_gss_callbacks) = SLIST_HEAD_INITIALIZER(svc_rpc_gss_callbacks);\n\n Line 250: \tstruct svc_rpc_gss_callback *scb;\n\n Line 252: \tscb = mem_alloc(sizeof(struct svc_rpc_gss_callback));\n\n Line 259: \tSLIST_INSERT_HEAD(&KGSS_VNET(svc_rpc_gss_callbacks), scb, cb_link);\n\n Line 268: \tstruct svc_rpc_gss_callback *scb;\n\n Line 271: \tSLIST_FOREACH(scb, &KGSS_VNET(svc_rpc_gss_callbacks), cb_link) {\n\n Line 275: \t\t\tSLIST_REMOVE(&KGSS_VNET(svc_rpc_gss_callbacks), scb,\n\n Line 276: \t\t\t svc_rpc_gss_callback, cb_link);\n\n Line 1254: svc_rpc_gss_callback(struct svc_rpc_gss_client *client, struct svc_req *rqst)\n\n Line 1256: \tstruct svc_rpc_gss_callback *scb;\n\n Line 1266: \tSLIST_FOREACH(scb, &KGSS_VNET(svc_rpc_gss_callbacks), cb_link) {\n\n Line 1587: \t\t\t\tif (!svc_rpc_gss_callback(client, rqst)) {\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "grep",
"state": {
"status": "completed",
"input": {
"pattern": "msg->rm_call\\.cb_cred|&msg->rm_call\\.cb_cred",
"path": "freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c"
},
"output": "Found 1 matches\nfreebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c:\n Line 1181: \toa = &msg->rm_call.cb_cred;\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/rpc_callmsg.c",
"offset": 100,
"limit": 60
},
"output": "freebsd/sys/rpc/rpc_callmsg.c\nfile\n\n100: \tif (xdrs->x_op == XDR_DECODE) {\n101: \t\tbuf = XDR_INLINE(xdrs, 8 * BYTES_PER_XDR_UNIT);\n102: \t\tif (buf != NULL) {\n103: \t\t\tcmsg->rm_xid = IXDR_GET_UINT32(buf);\n104: \t\t\tcmsg->rm_direction = IXDR_GET_ENUM(buf, enum msg_type);\n105: \t\t\tif (cmsg->rm_direction != CALL) {\n106: \t\t\t\treturn (FALSE);\n107: \t\t\t}\n108: \t\t\tcmsg->rm_call.cb_rpcvers = IXDR_GET_UINT32(buf);\n109: \t\t\tif (cmsg->rm_call.cb_rpcvers != RPC_MSG_VERSION) {\n110: \t\t\t\treturn (FALSE);\n111: \t\t\t}\n112: \t\t\tcmsg->rm_call.cb_prog = IXDR_GET_UINT32(buf);\n113: \t\t\tcmsg->rm_call.cb_vers = IXDR_GET_UINT32(buf);\n114: \t\t\tcmsg->rm_call.cb_proc = IXDR_GET_UINT32(buf);\n115: \t\t\toa = &cmsg->rm_call.cb_cred;\n116: \t\t\toa->oa_flavor = IXDR_GET_ENUM(buf, enum_t);\n117: \t\t\toa->oa_length = (u_int)IXDR_GET_UINT32(buf);\n118: \t\t\tif (oa->oa_length) {\n119: \t\t\t\tif (oa->oa_length > MAX_AUTH_BYTES) {\n120: \t\t\t\t\treturn (FALSE);\n121: \t\t\t\t}\n122: \t\t\t\tif (oa->oa_base == NULL) {\n123: \t\t\t\t\toa->oa_base = (caddr_t)\n124: \t\t\t\t\t mem_alloc(oa->oa_length);\n125: \t\t\t\t\tif (oa->oa_base == NULL)\n126: \t\t\t\t\t\treturn (FALSE);\n127: \t\t\t\t}\n128: \t\t\t\tbuf = XDR_INLINE(xdrs, RNDUP(oa->oa_length));\n129: \t\t\t\tif (buf == NULL) {\n130: \t\t\t\t\tif (xdr_opaque(xdrs, oa->oa_base,\n131: \t\t\t\t\t oa->oa_length) == FALSE) {\n132: \t\t\t\t\t\treturn (FALSE);\n133: \t\t\t\t\t}\n134: \t\t\t\t} else {\n135: \t\t\t\t\tmemcpy(oa->oa_base, buf,\n136: \t\t\t\t\t oa->oa_length);\n137: \t\t\t\t\t/* no real need....\n138: \t\t\t\t\tbuf += RNDUP(oa->oa_length) /\n139: \t\t\t\t\t\tsizeof (int32_t);\n140: \t\t\t\t\t*/\n141: \t\t\t\t}\n142: \t\t\t}\n143: \t\t\toa = &cmsg->rm_call.cb_verf;\n144: \t\t\tbuf = XDR_INLINE(xdrs, 2 * BYTES_PER_XDR_UNIT);\n145: \t\t\tif (buf == NULL) {\n146: \t\t\t\tif (xdr_enum(xdrs, &oa->oa_flavor) == FALSE ||\n147: \t\t\t\t xdr_u_int(xdrs, &oa->oa_length) == FALSE) {\n148: \t\t\t\t\treturn (FALSE);\n149: \t\t\t\t}\n150: \t\t\t} else {\n151: \t\t\t\toa->oa_flavor = IXDR_GET_ENUM(buf, enum_t);\n152: \t\t\t\toa->oa_length = (u_int)IXDR_GET_UINT32(buf);\n153: \t\t\t}\n154: \t\t\tif (oa->oa_length) {\n155: \t\t\t\tif (oa->oa_length > MAX_AUTH_BYTES) {\n156: \t\t\t\t\treturn (FALSE);\n157: \t\t\t\t}\n158: \t\t\t\tif (oa->oa_base == NULL) {\n159: \t\t\t\t\toa->oa_base = (caddr_t)\n\n(Showing lines 100-159 of 195. Use offset=160 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/rpc_prot.c",
"offset": 65,
"limit": 25
},
"output": "freebsd/sys/rpc/rpc_prot.c\nfile\n\n65: struct opaque_auth _null_auth;\n66: \n67: /*\n68: * XDR an opaque authentication struct\n69: * (see auth.h)\n70: */\n71: bool_t\n72: xdr_opaque_auth(XDR *xdrs, struct opaque_auth *ap)\n73: {\n74: \n75: \tassert(xdrs != NULL);\n76: \tassert(ap != NULL);\n77: \n78: \tif (xdr_enum(xdrs, &(ap->oa_flavor)))\n79: \t\treturn (xdr_bytes(xdrs, &ap->oa_base,\n80: \t\t\t&ap->oa_length, MAX_AUTH_BYTES));\n81: \treturn (FALSE);\n82: }\n83: \n84: /* * * * * * * * * * * * * * XDR RPC MESSAGE * * * * * * * * * * * * * * * */\n85: \n86: /*\n87: * XDR the MSG_ACCEPTED part of a reply message union\n88: */\n89: bool_t\n\n(Showing lines 65-89 of 366. Use offset=90 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "grep",
"state": {
"status": "completed",
"input": {
"pattern": "svc_rpc_gss_validate",
"path": "freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c"
},
"output": "Found 3 matches\nfreebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c:\n Line 1159: svc_rpc_gss_validate(struct svc_rpc_gss_client *client, struct rpc_msg *msg,\n\n Line 1169: \trpc_gss_log_debug(\"in svc_rpc_gss_validate()\");\n\n Line 1546: \t\tif (!svc_rpc_gss_validate(client, msg, &qop, gc.gc_proc)) {\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c",
"offset": 1495,
"limit": 50
},
"output": "freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c\nfile\n\n1495: \tcase RPCSEC_GSS_INIT:\n1496: \tcase RPCSEC_GSS_CONTINUE_INIT:\n1497: \t\tif (rqst->rq_proc != NULLPROC) {\n1498: \t\t\tresult = AUTH_REJECTEDCRED;\n1499: \t\t\tbreak;\n1500: \t\t}\n1501: \n1502: \t\tmemset(&gr, 0, sizeof(gr));\n1503: \t\tif (!svc_rpc_gss_accept_sec_context(client, rqst, &gr, &gc)) {\n1504: \t\t\tresult = AUTH_REJECTEDCRED;\n1505: \t\t\tbreak;\n1506: \t\t}\n1507: \n1508: \t\tif (gr.gr_major == GSS_S_COMPLETE) {\n1509: \t\t\t/*\n1510: \t\t\t * We borrow the space for the call verf to\n1511: \t\t\t * pack our reply verf.\n1512: \t\t\t */\n1513: \t\t\trqst->rq_verf = msg->rm_call.cb_verf;\n1514: \t\t\tif (!svc_rpc_gss_nextverf(client, rqst, gr.gr_win)) {\n1515: \t\t\t\tresult = AUTH_REJECTEDCRED;\n1516: \t\t\t\tbreak;\n1517: \t\t\t}\n1518: \t\t} else {\n1519: \t\t\trqst->rq_verf = _null_auth;\n1520: \t\t}\n1521: \t\t\n1522: \t\tcall_stat = svc_sendreply(rqst,\n1523: \t\t (xdrproc_t) xdr_rpc_gss_init_res,\n1524: \t\t (caddr_t) &gr);\n1525: \n1526: \t\tgss_release_buffer(&min_stat, &gr.gr_token);\n1527: \n1528: \t\tif (!call_stat) {\n1529: \t\t\tresult = AUTH_FAILED;\n1530: \t\t\tbreak;\n1531: \t\t}\n1532: \n1533: \t\tif (gr.gr_major == GSS_S_COMPLETE)\n1534: \t\t\tclient->cl_state = CLIENT_ESTABLISHED;\n1535: \n1536: \t\tresult = RPCSEC_GSS_NODISPATCH;\n1537: \t\tbreak;\n1538: \t\t\n1539: \tcase RPCSEC_GSS_DATA:\n1540: \tcase RPCSEC_GSS_DESTROY:\n1541: \t\tif (!svc_rpc_gss_check_replay(client, gc.gc_seq)) {\n1542: \t\t\tresult = RPCSEC_GSS_NODISPATCH;\n1543: \t\t\tbreak;\n1544: \t\t}\n\n(Showing lines 1495-1544 of 1715. Use offset=1545 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "grep",
"state": {
"status": "completed",
"input": {
"pattern": "SVC_RECV",
"path": "freebsd/sys/rpc/svc.c"
},
"output": "Found 1 matches\nfreebsd/sys/rpc/svc.c:\n Line 935: \tif (SVC_RECV(xprt, &msg, &r->rq_addr, &args)) {\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/svc.c",
"offset": 935,
"limit": 30
},
"output": "freebsd/sys/rpc/svc.c\nfile\n\n935: \tif (SVC_RECV(xprt, &msg, &r->rq_addr, &args)) {\n936: \t\tenum auth_stat why;\n937: \n938: \t\t/*\n939: \t\t * Handle replays and authenticate before queuing the\n940: \t\t * request to be executed.\n941: \t\t */\n942: \t\tSVC_ACQUIRE(xprt);\n943: \t\tr->rq_xprt = xprt;\n944: \t\tif (pool->sp_rcache) {\n945: \t\t\tstruct rpc_msg repmsg;\n946: \t\t\tstruct mbuf *repbody;\n947: \t\t\tenum replay_state rs;\n948: \t\t\trs = replay_find(pool->sp_rcache, &msg,\n949: \t\t\t svc_getrpccaller(r), &repmsg, &repbody);\n950: \t\t\tswitch (rs) {\n951: \t\t\tcase RS_NEW:\n952: \t\t\t\tbreak;\n953: \t\t\tcase RS_DONE:\n954: \t\t\t\tSVC_REPLY(xprt, &repmsg, r->rq_addr,\n955: \t\t\t\t repbody, &r->rq_reply_seq);\n956: \t\t\t\tif (r->rq_addr) {\n957: \t\t\t\t\tfree(r->rq_addr, M_SONAME);\n958: \t\t\t\t\tr->rq_addr = NULL;\n959: \t\t\t\t}\n960: \t\t\t\tm_freem(args);\n961: \t\t\t\tgoto call_done;\n962: \n963: \t\t\tdefault:\n964: \t\t\t\tm_freem(args);\n\n(Showing lines 935-964 of 1498. Use offset=965 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/svc.c",
"offset": 965,
"limit": 30
},
"output": "freebsd/sys/rpc/svc.c\nfile\n\n965: \t\t\t\tgoto call_done;\n966: \t\t\t}\n967: \t\t}\n968: \n969: \t\tr->rq_xid = msg.rm_xid;\n970: \t\tr->rq_prog = msg.rm_call.cb_prog;\n971: \t\tr->rq_vers = msg.rm_call.cb_vers;\n972: \t\tr->rq_proc = msg.rm_call.cb_proc;\n973: \t\tr->rq_size = sizeof(*r) + m_length(args, NULL);\n974: \t\tr->rq_args = args;\n975: \t\tif ((why = _authenticate(r, &msg)) != AUTH_OK) {\n976: \t\t\t/*\n977: \t\t\t * RPCSEC_GSS uses this return code\n978: \t\t\t * for requests that form part of its\n979: \t\t\t * context establishment protocol and\n980: \t\t\t * should not be dispatched to the\n981: \t\t\t * application.\n982: \t\t\t */\n983: \t\t\tif (why != RPCSEC_GSS_NODISPATCH)\n984: \t\t\t\tsvcerr_auth(r, why);\n985: \t\t\tgoto call_done;\n986: \t\t}\n987: \n988: \t\tif (!SVCAUTH_UNWRAP(&r->rq_auth, &r->rq_args)) {\n989: \t\t\tsvcerr_decode(r);\n990: \t\t\tgoto call_done;\n991: \t\t}\n992: \n993: \t\t/*\n994: \t\t * Defer enabling DDP until the first non-NULLPROC RPC\n\n(Showing lines 965-994 of 1498. Use offset=995 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c",
"offset": 1158,
"limit": 58
},
"output": "freebsd/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c\nfile\n\n1158: static bool_t\n1159: svc_rpc_gss_validate(struct svc_rpc_gss_client *client, struct rpc_msg *msg,\n1160: gss_qop_t *qop, rpc_gss_proc_t gcproc)\n1161: {\n1162: \tstruct opaque_auth\t*oa;\n1163: \tgss_buffer_desc\t\t rpcbuf, checksum;\n1164: \tOM_uint32\t\t maj_stat, min_stat;\n1165: \tgss_qop_t\t\t qop_state;\n1166: \tint32_t\t\t\t rpchdr[128 / sizeof(int32_t)];\n1167: \tint32_t\t\t\t*buf;\n1168: \n1169: \trpc_gss_log_debug(\"in svc_rpc_gss_validate()\");\n1170: \t\n1171: \tmemset(rpchdr, 0, sizeof(rpchdr));\n1172: \n1173: \t/* Reconstruct RPC header for signing (from xdr_callmsg). */\n1174: \tbuf = rpchdr;\n1175: \tIXDR_PUT_LONG(buf, msg->rm_xid);\n1176: \tIXDR_PUT_ENUM(buf, msg->rm_direction);\n1177: \tIXDR_PUT_LONG(buf, msg->rm_call.cb_rpcvers);\n1178: \tIXDR_PUT_LONG(buf, msg->rm_call.cb_prog);\n1179: \tIXDR_PUT_LONG(buf, msg->rm_call.cb_vers);\n1180: \tIXDR_PUT_LONG(buf, msg->rm_call.cb_proc);\n1181: \toa = &msg->rm_call.cb_cred;\n1182: \tIXDR_PUT_ENUM(buf, oa->oa_flavor);\n1183: \tIXDR_PUT_LONG(buf, oa->oa_length);\n1184: \tif (oa->oa_length) {\n1185: \t\tmemcpy((caddr_t)buf, oa->oa_base, oa->oa_length);\n1186: \t\tbuf += RNDUP(oa->oa_length) / sizeof(int32_t);\n1187: \t}\n1188: \trpcbuf.value = rpchdr;\n1189: \trpcbuf.length = (u_char *)buf - (u_char *)rpchdr;\n1190: \n1191: \tchecksum.value = msg->rm_call.cb_verf.oa_base;\n1192: \tchecksum.length = msg->rm_call.cb_verf.oa_length;\n1193: \t\n1194: \tmaj_stat = gss_verify_mic(&min_stat, client->cl_ctx, &rpcbuf, &checksum,\n1195: \t\t\t\t &qop_state);\n1196: \t\n1197: \tif (maj_stat != GSS_S_COMPLETE) {\n1198: \t\trpc_gss_log_status(\"gss_verify_mic\", client->cl_mech,\n1199: \t\t maj_stat, min_stat);\n1200: \t\t/*\n1201: \t\t * A bug in some versions of the Linux client generates a\n1202: \t\t * Destroy operation with a bogus encrypted checksum. Deleting\n1203: \t\t * the credential handle for that case causes the mount to fail.\n1204: \t\t * Since the checksum is bogus (gss_verify_mic() failed), it\n1205: \t\t * doesn't make sense to destroy the handle and not doing so\n1206: \t\t * fixes the Linux mount.\n1207: \t\t */\n1208: \t\tif (gcproc != RPCSEC_GSS_DESTROY)\n1209: \t\t\tclient->cl_state = CLIENT_STALE;\n1210: \t\treturn (FALSE);\n1211: \t}\n1212: \n1213: \t*qop = qop_state;\n1214: \treturn (TRUE);\n1215: }\n\n(Showing lines 1158-1215 of 1715. Use offset=1216 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "read",
"state": {
"status": "completed",
"input": {
"filePath": "freebsd/sys/rpc/xdr.h",
"offset": 86,
"limit": 10
},
"output": "freebsd/sys/rpc/xdr.h\nfile\n\n86: /*\n87: * This is the number of bytes per unit of external data.\n88: */\n89: #define BYTES_PER_XDR_UNIT\t(4)\n90: #define RNDUP(x) ((((x) + BYTES_PER_XDR_UNIT - 1) / BYTES_PER_XDR_UNIT) \\\n91: \t\t * BYTES_PER_XDR_UNIT)\n92: \n93: /*\n94: * The XDR handle.\n95: * Contains operation which is being applied to the stream,\n\n(Showing lines 86-95 of 390. Use offset=96 to continue.)\n"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "todowrite",
"state": {
"status": "completed",
"input": {
"todos": [
{
"content": "Read task.md and guide.md for context",
"status": "completed",
"priority": "high"
},
{
"content": "Read the target chunk (lines 1158-1215) of svc_rpcsec_gss.c",
"status": "completed",
"priority": "high"
},
{
"content": "Read surrounding context in the target file",
"status": "completed",
"priority": "high"
},
{
"content": "Read context files (auth.h, rpc_msg.h)",
"status": "completed",
"priority": "high"
},
{
"content": "Trace callers of svc_rpc_gss_validate",
"status": "completed",
"priority": "high"
},
{
"content": "Formulate and test at least 3 attacker-controlled failure hypotheses",
"status": "completed",
"priority": "high"
},
{
"content": "Report findings via StructuredOutput",
"status": "in_progress",
"priority": "high"
}
]
},
"output": "[\n {\n \"content\": \"Read task.md and guide.md for context\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Read the target chunk (lines 1158-1215) of svc_rpcsec_gss.c\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Read surrounding context in the target file\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Read context files (auth.h, rpc_msg.h)\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Trace callers of svc_rpc_gss_validate\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Formulate and test at least 3 attacker-controlled failure hypotheses\",\n \"status\": \"completed\",\n \"priority\": \"high\"\n },\n {\n \"content\": \"Report findings via StructuredOutput\",\n \"status\": \"in_progress\",\n \"priority\": \"high\"\n }\n]"
}
}
]
},
{
"role": "assistant",
"parts": [
{
"type": "tool",
"tool": "StructuredOutput",
"state": {
"status": "completed",
"input": {
"findings": [
{
"name": "Stack buffer overflow in svc_rpc_gss_validate via attacker-controlled oa_length",
"summary": "The function svc_rpc_gss_validate reconstructs an RPC header into a fixed-size stack buffer rpchdr[128/sizeof(int32_t)] (128 bytes). Before the memcpy of credential data at line 1185, 8 IXDR_PUT_LONG/ENUM calls write 32 bytes (8 * 4 bytes each). This leaves 96 bytes of remaining space. The memcpy at line 1185 copies oa->oa_length bytes from oa->oa_base into buf. The oa_length field originates from the network-supplied RPC credential and is constrained to MAX_AUTH_BYTES (400) by the XDR decode layer in xdr_callmsg (rpc_callmsg.c:119). Since MAX_AUTH_BYTES (400) > remaining buffer space (96), an attacker who sends a valid RPCSEC_GSS credential with oa_length between 97 and 400 will overflow the stack buffer by up to 304 bytes, enabling kernel stack corruption and potential code execution.",
"cwe": "CWE-121",
"cweId": 121,
"severity": "critical",
"range": {
"start": 1166,
"end": 1189
},
"line": 1185,
"evidenceLines": [
1166,
1174,
1175,
1176,
1177,
1178,
1179,
1180,
1181,
1182,
1183,
1184,
1185,
1186
],
"evidenceSummary": "Line 1166 declares rpchdr[128/sizeof(int32_t)] = 32 int32_t elements = 128 bytes. Lines 1175-1183 perform 8 IXDR_PUT_LONG/ENUM calls, each advancing buf by sizeof(int32_t), consuming 32 bytes. Line 1185 then does memcpy((caddr_t)buf, oa->oa_base, oa->oa_length) with no check that oa->oa_length fits in the remaining 96 bytes. The upstream decoder xdr_callmsg (rpc_callmsg.c:119) only enforces oa_length <= MAX_AUTH_BYTES (400), so up to 400 bytes can be copied into 96 bytes of remaining space.",
"attackerControl": "An attacker controls oa_length and oa_base content through the RPC credential body sent over the network. The XDR deserialization layer (xdr_callmsg) enforces oa_length <= 400 but the buffer only has 96 bytes remaining after the header fields are written. Any oa_length value between 97 and 400 triggers the overflow.",
"impact": "Kernel stack buffer overflow of up to 304 bytes. An attacker can overwrite the return address and local variables on the kernel stack, potentially achieving arbitrary kernel code execution. This is reachable from the network by any client that has initiated an RPCSEC_GSS context (DATA or DESTROY phase at line 1546).",
"contextFilePaths": [
"sys/rpc/auth.h",
"sys/rpc/rpc_callmsg.c",
"sys/rpc/xdr.h",
"sys/rpc/rpcsec_gss/svc_rpcsec_gss.c"
]
}
],
"summary": "The svc_rpc_gss_validate function (lines 1158-1215) contains a critical kernel stack buffer overflow vulnerability. A fixed 128-byte stack buffer is used to reconstruct the RPC call header for MIC verification. After writing 32 bytes of fixed header fields, the function copies oa_length bytes of attacker-controlled credential data with no bounds check. The upstream XDR layer permits oa_length up to MAX_AUTH_BYTES=400, but only 96 bytes of buffer space remain, allowing a 304-byte overflow.",
"supportingNotes": [
"Hypothesis 1 (REPORTED): Stack buffer overflow via oa_length. The rpchdr buffer is 128 bytes. After 8 IXDR_PUT_LONG writes (32 bytes), only 96 bytes remain. memcpy at line 1185 copies oa->oa_length bytes (up to MAX_AUTH_BYTES=400) without checking against remaining space. Confirmed: xdr_callmsg in rpc_callmsg.c:119 only bounds oa_length to 400, not 96.",
"Hypothesis 2 (REFUTED): Integer overflow in RNDUP(oa_length) causing wraparound. RNDUP adds 3 and divides by 4, then multiplies by 4. For oa_length <= 400 (MAX_AUTH_BYTES), RNDUP produces at most 400. No wraparound possible for these small values. The RNDUP result is only used to advance the buf pointer (line 1186), which occurs AFTER the overflow, so this is not an independent vulnerability but part of the same overflow.",
"Hypothesis 3 (REFUTED): Attacker can supply arbitrary checksum.value/length to cause issues in gss_verify_mic. The checksum comes from cb_verf which is also bounded to MAX_AUTH_BYTES by the XDR decode layer (rpc_callmsg.c:155). gss_verify_mic is a GSS-API function that takes a buffer descriptor and validates cryptographically; it does not trust the length for memory operations beyond its own internal validation. No overflow or injection path found.",
"Hypothesis 4 (REFUTED): Missing NULL check on oa->oa_base before memcpy. The condition at line 1184 checks 'if (oa->oa_length)' which only gates on non-zero length. However, in xdr_callmsg decode path (rpc_callmsg.c:118-141), if oa_length > 0, oa_base is guaranteed to be set (either pre-allocated from rq_credarea or freshly allocated). The cb_cred.oa_base is initialized to r->rq_credarea in svc.c:932, so it is always valid when oa_length > 0."
]
},
"output": "Structured output captured successfully."
}
}
]
}
]