Changeset 745 for trunk/server/source4/auth/ntlmssp/ntlmssp_server.c
- Timestamp:
- Nov 27, 2012, 4:43:17 PM (13 years ago)
- Location:
- trunk/server
- Files:
-
- 2 edited
-
. (modified) (1 prop)
-
source4/auth/ntlmssp/ntlmssp_server.c (modified) (2 diffs)
Legend:
- Unmodified
- Added
- Removed
-
trunk/server
- Property svn:mergeinfo changed
/vendor/current merged: 581,587,591,594,597,600,615,618,740
- Property svn:mergeinfo changed
-
trunk/server/source4/auth/ntlmssp/ntlmssp_server.c
r414 r745 24 24 #include "includes.h" 25 25 #include "system/network.h" 26 26 27 #include "auth/ntlmssp/ntlmssp.h" 27 #include "../librpc/gen_ndr/ntlmssp.h" 28 #include "../librpc/gen_ndr/ndr_ntlmssp.h" 29 #include "../libcli/auth/ntlmssp_ndr.h" 30 #include "../libcli/auth/ntlmssp_private.h" 28 31 #include "../libcli/auth/libcli_auth.h" 29 32 #include "../lib/crypto/crypto.h" 30 33 #include "auth/gensec/gensec.h" 34 31 35 #include "auth/auth.h" 32 #include "auth/ntlm/auth_proto.h"33 36 #include "param/param.h" 34 #include "auth/session_proto.h" 35 36 /** 37 * Set a username on an NTLMSSP context - ensures it is talloc()ed 38 * 39 */ 40 41 static NTSTATUS ntlmssp_set_username(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *user) 42 { 43 if (!user) { 44 /* it should be at least "" */ 45 DEBUG(1, ("NTLMSSP failed to set username - cannot accept NULL username\n")); 46 return NT_STATUS_INVALID_PARAMETER; 47 } 48 gensec_ntlmssp_state->user = talloc_strdup(gensec_ntlmssp_state, user); 49 if (!gensec_ntlmssp_state->user) { 50 return NT_STATUS_NO_MEMORY; 51 } 52 return NT_STATUS_OK; 53 } 54 55 /** 56 * Set a domain on an NTLMSSP context - ensures it is talloc()ed 57 * 58 */ 59 static NTSTATUS ntlmssp_set_domain(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *domain) 60 { 61 gensec_ntlmssp_state->domain = talloc_strdup(gensec_ntlmssp_state, domain); 62 if (!gensec_ntlmssp_state->domain) { 63 return NT_STATUS_NO_MEMORY; 64 } 65 return NT_STATUS_OK; 66 } 67 68 /** 69 * Set a workstation on an NTLMSSP context - ensures it is talloc()ed 70 * 71 */ 72 static NTSTATUS ntlmssp_set_workstation(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *workstation) 73 { 74 gensec_ntlmssp_state->workstation = talloc_strdup(gensec_ntlmssp_state, workstation); 75 if (!gensec_ntlmssp_state->workstation) { 76 return NT_STATUS_NO_MEMORY; 77 } 78 return NT_STATUS_OK; 79 } 80 81 /** 82 * Determine correct target name flags for reply, given server role 83 * and negotiated flags 84 * 85 * @param gensec_ntlmssp_state NTLMSSP State 86 * @param neg_flags The flags from the packet 87 * @param chal_flags The flags to be set in the reply packet 88 * @return The 'target name' string. 89 */ 90 91 static const char *ntlmssp_target_name(struct gensec_ntlmssp_state *gensec_ntlmssp_state, 92 uint32_t neg_flags, uint32_t *chal_flags) 93 { 94 if (neg_flags & NTLMSSP_REQUEST_TARGET) { 95 *chal_flags |= NTLMSSP_NEGOTIATE_TARGET_INFO; 96 *chal_flags |= NTLMSSP_REQUEST_TARGET; 97 if (gensec_ntlmssp_state->server_role == ROLE_STANDALONE) { 98 *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER; 99 return gensec_ntlmssp_state->server_name; 100 } else { 101 *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN; 102 return gensec_ntlmssp_state->domain; 103 }; 104 } else { 105 return ""; 106 } 107 } 108 109 110 111 /** 112 * Next state function for the Negotiate packet 113 * 37 38 /** 39 * Next state function for the Negotiate packet (GENSEC wrapper) 40 * 114 41 * @param gensec_security GENSEC state 115 42 * @param out_mem_ctx Memory context for *out 116 43 * @param in The request, as a DATA_BLOB. reply.data must be NULL 117 44 * @param out The reply, as an allocated DATA_BLOB, caller to free. 118 * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required. 119 */ 120 121 NTSTATUS ntlmssp_server_negotiate(struct gensec_security *gensec_security, 122 TALLOC_CTX *out_mem_ctx, 123 const DATA_BLOB in, DATA_BLOB *out) 124 { 125 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data; 126 DATA_BLOB struct_blob; 127 uint32_t neg_flags = 0; 128 uint32_t ntlmssp_command, chal_flags; 129 const uint8_t *cryptkey; 130 const char *target_name; 131 132 /* parse the NTLMSSP packet */ 133 #if 0 134 file_save("ntlmssp_negotiate.dat", request.data, request.length); 135 #endif 136 137 if (in.length) { 138 if ((in.length < 16) || !msrpc_parse(out_mem_ctx, 139 &in, "Cdd", 140 "NTLMSSP", 141 &ntlmssp_command, 142 &neg_flags)) { 143 DEBUG(1, ("ntlmssp_server_negotiate: failed to parse " 144 "NTLMSSP Negotiate of length %u:\n", 145 (unsigned int)in.length )); 146 dump_data(2, in.data, in.length); 147 return NT_STATUS_INVALID_PARAMETER; 148 } 149 debug_ntlmssp_flags(neg_flags); 150 } 151 152 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, neg_flags, gensec_ntlmssp_state->allow_lm_key); 153 154 /* Ask our caller what challenge they would like in the packet */ 155 cryptkey = gensec_ntlmssp_state->get_challenge(gensec_ntlmssp_state); 156 if (!cryptkey) { 157 DEBUG(1, ("ntlmssp_server_negotiate: backend doesn't give a challenge\n")); 158 return NT_STATUS_INTERNAL_ERROR; 159 } 160 161 /* Check if we may set the challenge */ 162 if (!gensec_ntlmssp_state->may_set_challenge(gensec_ntlmssp_state)) { 163 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2; 164 } 165 166 /* The flags we send back are not just the negotiated flags, 167 * they are also 'what is in this packet'. Therfore, we 168 * operate on 'chal_flags' from here on 169 */ 170 171 chal_flags = gensec_ntlmssp_state->neg_flags; 172 173 /* get the right name to fill in as 'target' */ 174 target_name = ntlmssp_target_name(gensec_ntlmssp_state, 175 neg_flags, &chal_flags); 176 if (target_name == NULL) 45 * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required. 46 */ 47 48 NTSTATUS gensec_ntlmssp_server_negotiate(struct gensec_security *gensec_security, 49 TALLOC_CTX *out_mem_ctx, 50 const DATA_BLOB request, DATA_BLOB *reply) 51 { 52 struct gensec_ntlmssp_context *gensec_ntlmssp = 53 talloc_get_type_abort(gensec_security->private_data, 54 struct gensec_ntlmssp_context); 55 struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state; 56 return ntlmssp_server_negotiate(ntlmssp_state, out_mem_ctx, request, reply); 57 } 58 59 /** 60 * Next state function for the Authenticate packet (GENSEC wrapper) 61 * 62 * @param gensec_security GENSEC state 63 * @param out_mem_ctx Memory context for *out 64 * @param in The request, as a DATA_BLOB. reply.data must be NULL 65 * @param out The reply, as an allocated DATA_BLOB, caller to free. 66 * @return Errors or NT_STATUS_OK if authentication sucessful 67 */ 68 69 NTSTATUS gensec_ntlmssp_server_auth(struct gensec_security *gensec_security, 70 TALLOC_CTX *out_mem_ctx, 71 const DATA_BLOB in, DATA_BLOB *out) 72 { 73 struct gensec_ntlmssp_context *gensec_ntlmssp = 74 talloc_get_type_abort(gensec_security->private_data, 75 struct gensec_ntlmssp_context); 76 struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state; 77 return ntlmssp_server_auth(ntlmssp_state, out_mem_ctx, in, out); 78 } 79 80 /** 81 * Return the challenge as determined by the authentication subsystem 82 * @return an 8 byte random challenge 83 */ 84 85 static NTSTATUS auth_ntlmssp_get_challenge(const struct ntlmssp_state *ntlmssp_state, 86 uint8_t chal[8]) 87 { 88 struct gensec_ntlmssp_context *gensec_ntlmssp = 89 talloc_get_type_abort(ntlmssp_state->callback_private, 90 struct gensec_ntlmssp_context); 91 struct auth_context *auth_context = gensec_ntlmssp->auth_context; 92 NTSTATUS status; 93 94 status = auth_context->get_challenge(auth_context, chal); 95 if (!NT_STATUS_IS_OK(status)) { 96 DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n", 97 nt_errstr(status))); 98 return status; 99 } 100 101 return NT_STATUS_OK; 102 } 103 104 /** 105 * Some authentication methods 'fix' the challenge, so we may not be able to set it 106 * 107 * @return If the effective challenge used by the auth subsystem may be modified 108 */ 109 static bool auth_ntlmssp_may_set_challenge(const struct ntlmssp_state *ntlmssp_state) 110 { 111 struct gensec_ntlmssp_context *gensec_ntlmssp = 112 talloc_get_type_abort(ntlmssp_state->callback_private, 113 struct gensec_ntlmssp_context); 114 struct auth_context *auth_context = gensec_ntlmssp->auth_context; 115 116 return auth_context->challenge_may_be_modified(auth_context); 117 } 118 119 /** 120 * NTLM2 authentication modifies the effective challenge, 121 * @param challenge The new challenge value 122 */ 123 static NTSTATUS auth_ntlmssp_set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge) 124 { 125 struct gensec_ntlmssp_context *gensec_ntlmssp = 126 talloc_get_type_abort(ntlmssp_state->callback_private, 127 struct gensec_ntlmssp_context); 128 struct auth_context *auth_context = gensec_ntlmssp->auth_context; 129 NTSTATUS nt_status; 130 const uint8_t *chal; 131 132 if (challenge->length != 8) { 177 133 return NT_STATUS_INVALID_PARAMETER; 178 179 gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8); 180 gensec_ntlmssp_state->internal_chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8); 181 182 /* This creates the 'blob' of names that appears at the end of the packet */ 183 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) { 134 } 135 136 chal = challenge->data; 137 138 nt_status = auth_context->set_challenge(auth_context, 139 chal, 140 "NTLMSSP callback (NTLM2)"); 141 142 return nt_status; 143 } 144 145 /** 146 * Check the password on an NTLMSSP login. 147 * 148 * Return the session keys used on the connection. 149 */ 150 151 static NTSTATUS auth_ntlmssp_check_password(struct ntlmssp_state *ntlmssp_state, 152 TALLOC_CTX *mem_ctx, 153 DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key) 154 { 155 struct gensec_ntlmssp_context *gensec_ntlmssp = 156 talloc_get_type_abort(ntlmssp_state->callback_private, 157 struct gensec_ntlmssp_context); 158 struct auth_context *auth_context = gensec_ntlmssp->auth_context; 159 NTSTATUS nt_status; 160 struct auth_usersupplied_info *user_info; 161 162 user_info = talloc_zero(ntlmssp_state, struct auth_usersupplied_info); 163 if (!user_info) { 164 return NT_STATUS_NO_MEMORY; 165 } 166 167 user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT; 168 user_info->flags = 0; 169 user_info->mapped_state = false; 170 user_info->client.account_name = ntlmssp_state->user; 171 user_info->client.domain_name = ntlmssp_state->domain; 172 user_info->workstation_name = ntlmssp_state->client.netbios_name; 173 user_info->remote_host = gensec_get_remote_address(gensec_ntlmssp->gensec_security); 174 175 user_info->password_state = AUTH_PASSWORD_RESPONSE; 176 user_info->password.response.lanman = ntlmssp_state->lm_resp; 177 user_info->password.response.lanman.data = talloc_steal(user_info, ntlmssp_state->lm_resp.data); 178 user_info->password.response.nt = ntlmssp_state->nt_resp; 179 user_info->password.response.nt.data = talloc_steal(user_info, ntlmssp_state->nt_resp.data); 180 181 nt_status = auth_context->check_password(auth_context, 182 gensec_ntlmssp, 183 user_info, 184 &gensec_ntlmssp->user_info_dc); 185 talloc_free(user_info); 186 NT_STATUS_NOT_OK_RETURN(nt_status); 187 188 if (gensec_ntlmssp->user_info_dc->user_session_key.length) { 189 DEBUG(10, ("Got NT session key of length %u\n", 190 (unsigned)gensec_ntlmssp->user_info_dc->user_session_key.length)); 191 *user_session_key = gensec_ntlmssp->user_info_dc->user_session_key; 192 talloc_steal(mem_ctx, user_session_key->data); 193 gensec_ntlmssp->user_info_dc->user_session_key = data_blob_null; 194 } 195 if (gensec_ntlmssp->user_info_dc->lm_session_key.length) { 196 DEBUG(10, ("Got LM session key of length %u\n", 197 (unsigned)gensec_ntlmssp->user_info_dc->lm_session_key.length)); 198 *lm_session_key = gensec_ntlmssp->user_info_dc->lm_session_key; 199 talloc_steal(mem_ctx, lm_session_key->data); 200 gensec_ntlmssp->user_info_dc->lm_session_key = data_blob_null; 201 } 202 return nt_status; 203 } 204 205 /** 206 * Return the credentials of a logged on user, including session keys 207 * etc. 208 * 209 * Only valid after a successful authentication 210 * 211 * May only be called once per authentication. 212 * 213 */ 214 215 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security, 216 struct auth_session_info **session_info) 217 { 218 NTSTATUS nt_status; 219 struct gensec_ntlmssp_context *gensec_ntlmssp = 220 talloc_get_type_abort(gensec_security->private_data, 221 struct gensec_ntlmssp_context); 222 struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state; 223 224 nt_status = gensec_generate_session_info(ntlmssp_state, 225 gensec_security, 226 gensec_ntlmssp->user_info_dc, 227 session_info); 228 NT_STATUS_NOT_OK_RETURN(nt_status); 229 230 (*session_info)->session_key = data_blob_talloc(*session_info, 231 ntlmssp_state->session_key.data, 232 ntlmssp_state->session_key.length); 233 234 return NT_STATUS_OK; 235 } 236 237 /** 238 * Start NTLMSSP on the server side 239 * 240 */ 241 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security) 242 { 243 NTSTATUS nt_status; 244 struct ntlmssp_state *ntlmssp_state; 245 struct gensec_ntlmssp_context *gensec_ntlmssp; 246 247 nt_status = gensec_ntlmssp_start(gensec_security); 248 NT_STATUS_NOT_OK_RETURN(nt_status); 249 250 gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data, 251 struct gensec_ntlmssp_context); 252 ntlmssp_state = gensec_ntlmssp->ntlmssp_state; 253 254 ntlmssp_state->role = NTLMSSP_SERVER; 255 256 ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE; 257 258 ntlmssp_state->allow_lm_key = (lpcfg_lanman_auth(gensec_security->settings->lp_ctx) 259 && gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "allow_lm_key", false)); 260 261 ntlmssp_state->neg_flags = 262 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_VERSION; 263 264 ntlmssp_state->lm_resp = data_blob(NULL, 0); 265 ntlmssp_state->nt_resp = data_blob(NULL, 0); 266 267 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) { 268 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128; 269 } 270 271 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) { 272 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56; 273 } 274 275 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) { 276 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH; 277 } 278 279 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) { 280 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN; 281 } 282 283 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) { 284 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2; 285 } 286 287 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) { 288 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN; 289 } 290 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) { 291 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL; 292 } 293 294 gensec_ntlmssp->auth_context = gensec_security->auth_context; 295 296 ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge; 297 ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge; 298 ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge; 299 ntlmssp_state->check_password = auth_ntlmssp_check_password; 300 if (lpcfg_server_role(gensec_security->settings->lp_ctx) == ROLE_STANDALONE) { 301 ntlmssp_state->server.is_standalone = true; 302 } else { 303 ntlmssp_state->server.is_standalone = false; 304 } 305 306 ntlmssp_state->server.netbios_name = lpcfg_netbios_name(gensec_security->settings->lp_ctx); 307 308 ntlmssp_state->server.netbios_domain = lpcfg_workgroup(gensec_security->settings->lp_ctx); 309 310 { 184 311 char dnsdomname[MAXHOSTNAMELEN], dnsname[MAXHOSTNAMELEN]; 185 const char *target_name_dns = "";186 312 187 313 /* Find out the DNS domain name */ 188 314 dnsdomname[0] = '\0'; 189 safe_strcpy(dnsdomname, lp_realm(gensec_security->settings->lp_ctx), sizeof(dnsdomname) - 1); 190 strlower_m(dnsdomname); 315 safe_strcpy(dnsdomname, lpcfg_dnsdomain(gensec_security->settings->lp_ctx), sizeof(dnsdomname) - 1); 191 316 192 317 /* Find out the DNS host name */ 193 safe_strcpy(dnsname, gensec_ntlmssp_state->server_name, sizeof(dnsname) - 1);318 safe_strcpy(dnsname, _name, sizeof(dnsname) - 1); 194 319 if (dnsdomname[0] != '\0') { 195 320 safe_strcat(dnsname, ".", sizeof(dnsname) - 1); … … 198 323 strlower_m(dnsname); 199 324 200 if (chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN) { 201 target_name_dns = dnsdomname; 202 } else if (chal_flags |= NTLMSSP_TARGET_TYPE_SERVER) { 203 target_name_dns = dnsname; 204 } 205 206 msrpc_gen(out_mem_ctx, 207 &struct_blob, "aaaaa", 208 MsvAvNbDomainName, target_name, 209 MsvAvNbComputerName, gensec_ntlmssp_state->server_name, 210 MsvAvDnsDomainName, dnsdomname, 211 MsvAvDnsComputerName, dnsname, 212 MsvAvEOL, ""); 213 } else { 214 struct_blob = data_blob(NULL, 0); 215 } 216 217 { 218 /* Marshal the packet in the right format, be it unicode or ASCII */ 219 const char *gen_string; 220 if (gensec_ntlmssp_state->unicode) { 221 gen_string = "CdUdbddB"; 222 } else { 223 gen_string = "CdAdbddB"; 224 } 225 226 msrpc_gen(out_mem_ctx, 227 out, gen_string, 228 "NTLMSSP", 229 NTLMSSP_CHALLENGE, 230 target_name, 231 chal_flags, 232 cryptkey, 8, 233 0, 0, 234 struct_blob.data, struct_blob.length); 235 } 236 237 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH; 238 239 return NT_STATUS_MORE_PROCESSING_REQUIRED; 240 } 241 242 /** 243 * Next state function for the Authenticate packet 244 * 245 * @param gensec_ntlmssp_state NTLMSSP State 246 * @param request The request, as a DATA_BLOB 247 * @return Errors or NT_STATUS_OK. 248 */ 249 250 static NTSTATUS ntlmssp_server_preauth(struct gensec_ntlmssp_state *gensec_ntlmssp_state, 251 const DATA_BLOB request) 252 { 253 uint32_t ntlmssp_command, auth_flags; 254 NTSTATUS nt_status; 255 256 uint8_t session_nonce_hash[16]; 257 258 const char *parse_string; 259 char *domain = NULL; 260 char *user = NULL; 261 char *workstation = NULL; 262 263 #if 0 264 file_save("ntlmssp_auth.dat", request.data, request.length); 265 #endif 266 267 if (gensec_ntlmssp_state->unicode) { 268 parse_string = "CdBBUUUBd"; 269 } else { 270 parse_string = "CdBBAAABd"; 271 } 272 273 /* zero these out */ 274 data_blob_free(&gensec_ntlmssp_state->lm_resp); 275 data_blob_free(&gensec_ntlmssp_state->nt_resp); 276 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); 277 278 gensec_ntlmssp_state->user = NULL; 279 gensec_ntlmssp_state->domain = NULL; 280 gensec_ntlmssp_state->workstation = NULL; 281 282 /* now the NTLMSSP encoded auth hashes */ 283 if (!msrpc_parse(gensec_ntlmssp_state, 284 &request, parse_string, 285 "NTLMSSP", 286 &ntlmssp_command, 287 &gensec_ntlmssp_state->lm_resp, 288 &gensec_ntlmssp_state->nt_resp, 289 &domain, 290 &user, 291 &workstation, 292 &gensec_ntlmssp_state->encrypted_session_key, 293 &auth_flags)) { 294 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n")); 295 dump_data(10, request.data, request.length); 296 297 /* zero this out */ 298 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); 299 auth_flags = 0; 300 301 /* Try again with a shorter string (Win9X truncates this packet) */ 302 if (gensec_ntlmssp_state->unicode) { 303 parse_string = "CdBBUUU"; 304 } else { 305 parse_string = "CdBBAAA"; 306 } 307 308 /* now the NTLMSSP encoded auth hashes */ 309 if (!msrpc_parse(gensec_ntlmssp_state, 310 &request, parse_string, 311 "NTLMSSP", 312 &ntlmssp_command, 313 &gensec_ntlmssp_state->lm_resp, 314 &gensec_ntlmssp_state->nt_resp, 315 &domain, 316 &user, 317 &workstation)) { 318 DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n")); 319 dump_data(2, request.data, request.length); 320 321 return NT_STATUS_INVALID_PARAMETER; 322 } 323 } 324 325 if (auth_flags) 326 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, auth_flags, gensec_ntlmssp_state->allow_lm_key); 327 328 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(gensec_ntlmssp_state, domain))) { 329 /* zero this out */ 330 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); 331 return nt_status; 332 } 333 334 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(gensec_ntlmssp_state, user))) { 335 /* zero this out */ 336 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); 337 return nt_status; 338 } 339 340 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(gensec_ntlmssp_state, workstation))) { 341 /* zero this out */ 342 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); 343 return nt_status; 344 } 345 346 DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n", 347 gensec_ntlmssp_state->user, gensec_ntlmssp_state->domain, gensec_ntlmssp_state->workstation, (unsigned long)gensec_ntlmssp_state->lm_resp.length, (unsigned long)gensec_ntlmssp_state->nt_resp.length)); 348 349 #if 0 350 file_save("nthash1.dat", &gensec_ntlmssp_state->nt_resp.data, &gensec_ntlmssp_state->nt_resp.length); 351 file_save("lmhash1.dat", &gensec_ntlmssp_state->lm_resp.data, &gensec_ntlmssp_state->lm_resp.length); 352 #endif 353 354 /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a 355 client challenge 356 357 However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful. 358 */ 359 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) { 360 if (gensec_ntlmssp_state->nt_resp.length == 24 && gensec_ntlmssp_state->lm_resp.length == 24) { 361 struct MD5Context md5_session_nonce_ctx; 362 SMB_ASSERT(gensec_ntlmssp_state->internal_chal.data 363 && gensec_ntlmssp_state->internal_chal.length == 8); 364 365 gensec_ntlmssp_state->doing_ntlm2 = true; 366 367 memcpy(gensec_ntlmssp_state->crypt.ntlm2.session_nonce, gensec_ntlmssp_state->internal_chal.data, 8); 368 memcpy(&gensec_ntlmssp_state->crypt.ntlm2.session_nonce[8], gensec_ntlmssp_state->lm_resp.data, 8); 369 370 MD5Init(&md5_session_nonce_ctx); 371 MD5Update(&md5_session_nonce_ctx, gensec_ntlmssp_state->crypt.ntlm2.session_nonce, 16); 372 MD5Final(session_nonce_hash, &md5_session_nonce_ctx); 373 374 gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state, 375 session_nonce_hash, 8); 376 377 /* LM response is no longer useful, zero it out */ 378 data_blob_free(&gensec_ntlmssp_state->lm_resp); 379 380 /* We changed the effective challenge - set it */ 381 if (!NT_STATUS_IS_OK(nt_status = 382 gensec_ntlmssp_state->set_challenge(gensec_ntlmssp_state, 383 &gensec_ntlmssp_state->chal))) { 384 /* zero this out */ 385 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); 386 return nt_status; 387 } 388 389 /* LM Key is incompatible... */ 390 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; 391 } 392 } 325 ntlmssp_state->server.dns_name = talloc_strdup(ntlmssp_state, 326 dnsname); 327 NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_name); 328 329 ntlmssp_state->server.dns_domain = talloc_strdup(ntlmssp_state, 330 dnsdomname); 331 NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_domain); 332 } 333 393 334 return NT_STATUS_OK; 394 335 } 395 336 396 /**397 * Next state function for the Authenticate packet398 * (after authentication - figures out the session keys etc)399 *400 * @param gensec_ntlmssp_state NTLMSSP State401 * @return Errors or NT_STATUS_OK.402 */403 404 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,405 DATA_BLOB *user_session_key,406 DATA_BLOB *lm_session_key)407 {408 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;409 NTSTATUS nt_status;410 DATA_BLOB session_key = data_blob(NULL, 0);411 412 if (user_session_key)413 dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length);414 415 if (lm_session_key)416 dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length);417 418 /* Handle the different session key derivation for NTLM2 */419 if (gensec_ntlmssp_state->doing_ntlm2) {420 if (user_session_key && user_session_key->data && user_session_key->length == 16) {421 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);422 hmac_md5(user_session_key->data, gensec_ntlmssp_state->crypt.ntlm2.session_nonce,423 sizeof(gensec_ntlmssp_state->crypt.ntlm2.session_nonce), session_key.data);424 DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));425 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);426 427 } else {428 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));429 session_key = data_blob(NULL, 0);430 }431 } else if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)432 /* Ensure we can never get here on NTLMv2 */433 && (gensec_ntlmssp_state->nt_resp.length == 0 || gensec_ntlmssp_state->nt_resp.length == 24)) {434 435 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {436 if (gensec_ntlmssp_state->lm_resp.data && gensec_ntlmssp_state->lm_resp.length == 24) {437 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);438 SMBsesskeygen_lm_sess_key(lm_session_key->data, gensec_ntlmssp_state->lm_resp.data,439 session_key.data);440 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));441 dump_data_pw("LM session key:\n", session_key.data, session_key.length);442 } else {443 444 /* When there is no LM response, just use zeros */445 static const uint8_t zeros[24];446 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);447 SMBsesskeygen_lm_sess_key(zeros, zeros,448 session_key.data);449 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));450 dump_data_pw("LM session key:\n", session_key.data, session_key.length);451 }452 } else {453 /* LM Key not selected */454 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;455 456 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));457 session_key = data_blob(NULL, 0);458 }459 460 } else if (user_session_key && user_session_key->data) {461 session_key = data_blob_talloc(gensec_ntlmssp_state, user_session_key->data, user_session_key->length);462 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));463 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);464 465 /* LM Key not selected */466 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;467 468 } else if (lm_session_key && lm_session_key->data) {469 /* Very weird to have LM key, but no user session key, but anyway.. */470 session_key = data_blob_talloc(gensec_ntlmssp_state, lm_session_key->data, lm_session_key->length);471 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));472 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);473 474 /* LM Key not selected */475 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;476 477 } else {478 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));479 session_key = data_blob(NULL, 0);480 481 /* LM Key not selected */482 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;483 }484 485 /* With KEY_EXCH, the client supplies the proposed session key,486 but encrypts it with the long-term key */487 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {488 if (!gensec_ntlmssp_state->encrypted_session_key.data489 || gensec_ntlmssp_state->encrypted_session_key.length != 16) {490 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);491 DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",492 (unsigned)gensec_ntlmssp_state->encrypted_session_key.length));493 return NT_STATUS_INVALID_PARAMETER;494 } else if (!session_key.data || session_key.length != 16) {495 DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",496 (unsigned)session_key.length));497 gensec_ntlmssp_state->session_key = session_key;498 } else {499 dump_data_pw("KEY_EXCH session key (enc):\n",500 gensec_ntlmssp_state->encrypted_session_key.data,501 gensec_ntlmssp_state->encrypted_session_key.length);502 arcfour_crypt(gensec_ntlmssp_state->encrypted_session_key.data,503 session_key.data,504 gensec_ntlmssp_state->encrypted_session_key.length);505 gensec_ntlmssp_state->session_key = data_blob_talloc(gensec_ntlmssp_state,506 gensec_ntlmssp_state->encrypted_session_key.data,507 gensec_ntlmssp_state->encrypted_session_key.length);508 dump_data_pw("KEY_EXCH session key:\n", gensec_ntlmssp_state->encrypted_session_key.data,509 gensec_ntlmssp_state->encrypted_session_key.length);510 talloc_free(session_key.data);511 }512 } else {513 gensec_ntlmssp_state->session_key = session_key;514 }515 516 if ((gensec_security->want_features & GENSEC_FEATURE_SIGN)517 || (gensec_security->want_features & GENSEC_FEATURE_SEAL)) {518 nt_status = ntlmssp_sign_init(gensec_ntlmssp_state);519 } else {520 nt_status = NT_STATUS_OK;521 }522 523 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);524 525 /* allow arbitarily many authentications, but watch that this will cause a526 memory leak, until the gensec_ntlmssp_state is shutdown527 */528 529 if (gensec_ntlmssp_state->server_multiple_authentications) {530 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;531 } else {532 gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;533 }534 535 return nt_status;536 }537 538 539 /**540 * Next state function for the Authenticate packet541 *542 * @param gensec_security GENSEC state543 * @param out_mem_ctx Memory context for *out544 * @param in The request, as a DATA_BLOB. reply.data must be NULL545 * @param out The reply, as an allocated DATA_BLOB, caller to free.546 * @return Errors or NT_STATUS_OK if authentication sucessful547 */548 549 NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security,550 TALLOC_CTX *out_mem_ctx,551 const DATA_BLOB in, DATA_BLOB *out)552 {553 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;554 DATA_BLOB user_session_key = data_blob(NULL, 0);555 DATA_BLOB lm_session_key = data_blob(NULL, 0);556 NTSTATUS nt_status;557 558 TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);559 if (!mem_ctx) {560 return NT_STATUS_NO_MEMORY;561 }562 563 /* zero the outbound NTLMSSP packet */564 *out = data_blob_talloc(out_mem_ctx, NULL, 0);565 566 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_preauth(gensec_ntlmssp_state, in))) {567 talloc_free(mem_ctx);568 return nt_status;569 }570 571 /*572 * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth573 * is required (by "ntlm auth = no" and "lm auth = no" being set in the574 * smb.conf file) and no NTLMv2 response was sent then the password check575 * will fail here. JRA.576 */577 578 /* Finally, actually ask if the password is OK */579 580 if (!NT_STATUS_IS_OK(nt_status = gensec_ntlmssp_state->check_password(gensec_ntlmssp_state, mem_ctx,581 &user_session_key, &lm_session_key))) {582 talloc_free(mem_ctx);583 return nt_status;584 }585 586 if (gensec_security->want_features587 & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL|GENSEC_FEATURE_SESSION_KEY)) {588 nt_status = ntlmssp_server_postauth(gensec_security, &user_session_key, &lm_session_key);589 talloc_free(mem_ctx);590 return nt_status;591 } else {592 gensec_ntlmssp_state->session_key = data_blob(NULL, 0);593 talloc_free(mem_ctx);594 return NT_STATUS_OK;595 }596 }597 598 /**599 * Return the challenge as determined by the authentication subsystem600 * @return an 8 byte random challenge601 */602 603 static const uint8_t *auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)604 {605 NTSTATUS status;606 const uint8_t *chal;607 608 status = gensec_ntlmssp_state->auth_context->get_challenge(gensec_ntlmssp_state->auth_context, &chal);609 if (!NT_STATUS_IS_OK(status)) {610 DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n",611 nt_errstr(status)));612 return NULL;613 }614 615 return chal;616 }617 618 /**619 * Some authentication methods 'fix' the challenge, so we may not be able to set it620 *621 * @return If the effective challenge used by the auth subsystem may be modified622 */623 static bool auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)624 {625 return gensec_ntlmssp_state->auth_context->challenge_may_be_modified(gensec_ntlmssp_state->auth_context);626 }627 628 /**629 * NTLM2 authentication modifies the effective challenge,630 * @param challenge The new challenge value631 */632 static NTSTATUS auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *challenge)633 {634 NTSTATUS nt_status;635 struct auth_context *auth_context = gensec_ntlmssp_state->auth_context;636 const uint8_t *chal;637 638 if (challenge->length != 8) {639 return NT_STATUS_INVALID_PARAMETER;640 }641 642 chal = challenge->data;643 644 nt_status = gensec_ntlmssp_state->auth_context->set_challenge(auth_context,645 chal,646 "NTLMSSP callback (NTLM2)");647 648 return nt_status;649 }650 651 /**652 * Check the password on an NTLMSSP login.653 *654 * Return the session keys used on the connection.655 */656 657 static NTSTATUS auth_ntlmssp_check_password(struct gensec_ntlmssp_state *gensec_ntlmssp_state,658 TALLOC_CTX *mem_ctx,659 DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)660 {661 NTSTATUS nt_status;662 struct auth_usersupplied_info *user_info = talloc(mem_ctx, struct auth_usersupplied_info);663 if (!user_info) {664 return NT_STATUS_NO_MEMORY;665 }666 667 user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;668 user_info->flags = 0;669 user_info->mapped_state = false;670 user_info->client.account_name = gensec_ntlmssp_state->user;671 user_info->client.domain_name = gensec_ntlmssp_state->domain;672 user_info->workstation_name = gensec_ntlmssp_state->workstation;673 user_info->remote_host = gensec_get_peer_addr(gensec_ntlmssp_state->gensec_security);674 675 user_info->password_state = AUTH_PASSWORD_RESPONSE;676 user_info->password.response.lanman = gensec_ntlmssp_state->lm_resp;677 user_info->password.response.lanman.data = talloc_steal(user_info, gensec_ntlmssp_state->lm_resp.data);678 user_info->password.response.nt = gensec_ntlmssp_state->nt_resp;679 user_info->password.response.nt.data = talloc_steal(user_info, gensec_ntlmssp_state->nt_resp.data);680 681 nt_status = gensec_ntlmssp_state->auth_context->check_password(gensec_ntlmssp_state->auth_context,682 mem_ctx,683 user_info,684 &gensec_ntlmssp_state->server_info);685 talloc_free(user_info);686 NT_STATUS_NOT_OK_RETURN(nt_status);687 688 talloc_steal(gensec_ntlmssp_state, gensec_ntlmssp_state->server_info);689 690 if (gensec_ntlmssp_state->server_info->user_session_key.length) {691 DEBUG(10, ("Got NT session key of length %u\n",692 (unsigned)gensec_ntlmssp_state->server_info->user_session_key.length));693 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->user_session_key.data)) {694 return NT_STATUS_NO_MEMORY;695 }696 697 *user_session_key = gensec_ntlmssp_state->server_info->user_session_key;698 }699 if (gensec_ntlmssp_state->server_info->lm_session_key.length) {700 DEBUG(10, ("Got LM session key of length %u\n",701 (unsigned)gensec_ntlmssp_state->server_info->lm_session_key.length));702 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->lm_session_key.data)) {703 return NT_STATUS_NO_MEMORY;704 }705 706 *lm_session_key = gensec_ntlmssp_state->server_info->lm_session_key;707 }708 return nt_status;709 }710 711 /**712 * Return the credentials of a logged on user, including session keys713 * etc.714 *715 * Only valid after a successful authentication716 *717 * May only be called once per authentication.718 *719 */720 721 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,722 struct auth_session_info **session_info)723 {724 NTSTATUS nt_status;725 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;726 727 nt_status = auth_generate_session_info(gensec_ntlmssp_state, gensec_security->event_ctx, gensec_security->settings->lp_ctx, gensec_ntlmssp_state->server_info, session_info);728 NT_STATUS_NOT_OK_RETURN(nt_status);729 730 (*session_info)->session_key = data_blob_talloc(*session_info,731 gensec_ntlmssp_state->session_key.data,732 gensec_ntlmssp_state->session_key.length);733 734 return NT_STATUS_OK;735 }736 737 /**738 * Start NTLMSSP on the server side739 *740 */741 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)742 {743 NTSTATUS nt_status;744 struct gensec_ntlmssp_state *gensec_ntlmssp_state;745 746 nt_status = gensec_ntlmssp_start(gensec_security);747 NT_STATUS_NOT_OK_RETURN(nt_status);748 749 gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;750 751 gensec_ntlmssp_state->role = NTLMSSP_SERVER;752 753 gensec_ntlmssp_state->workstation = NULL;754 gensec_ntlmssp_state->server_name = lp_netbios_name(gensec_security->settings->lp_ctx);755 756 gensec_ntlmssp_state->domain = lp_workgroup(gensec_security->settings->lp_ctx);757 758 gensec_ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;759 760 gensec_ntlmssp_state->allow_lm_key = (lp_lanman_auth(gensec_security->settings->lp_ctx)761 && gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "allow_lm_key", false));762 763 gensec_ntlmssp_state->server_multiple_authentications = false;764 765 gensec_ntlmssp_state->neg_flags =766 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_VERSION;767 768 gensec_ntlmssp_state->lm_resp = data_blob(NULL, 0);769 gensec_ntlmssp_state->nt_resp = data_blob(NULL, 0);770 gensec_ntlmssp_state->encrypted_session_key = data_blob(NULL, 0);771 772 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {773 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;774 }775 776 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) {777 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;778 }779 780 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) {781 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;782 }783 784 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) {785 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;786 }787 788 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) {789 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;790 }791 792 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {793 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;794 }795 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {796 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;797 }798 799 gensec_ntlmssp_state->auth_context = gensec_security->auth_context;800 801 gensec_ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;802 gensec_ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;803 gensec_ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;804 gensec_ntlmssp_state->check_password = auth_ntlmssp_check_password;805 gensec_ntlmssp_state->server_role = lp_server_role(gensec_security->settings->lp_ctx);806 807 return NT_STATUS_OK;808 }809
Note:
See TracChangeset
for help on using the changeset viewer.
