diff options
Diffstat (limited to 'source4/auth/ntlmssp/ntlmssp_server.c')
| -rw-r--r-- | source4/auth/ntlmssp/ntlmssp_server.c | 821 |
1 files changed, 821 insertions, 0 deletions
diff --git a/source4/auth/ntlmssp/ntlmssp_server.c b/source4/auth/ntlmssp/ntlmssp_server.c new file mode 100644 index 0000000000..838596ee98 --- /dev/null +++ b/source4/auth/ntlmssp/ntlmssp_server.c @@ -0,0 +1,821 @@ +/* + Unix SMB/Netbios implementation. + Version 3.0 + handle NLTMSSP, client server side parsing + + Copyright (C) Andrew Tridgell 2001 + Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005 + Copyright (C) Stefan Metzmacher 2005 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include "includes.h" +#include "auth/ntlmssp/ntlmssp.h" +#include "auth/ntlmssp/msrpc_parse.h" +#include "lib/crypto/crypto.h" +#include "system/filesys.h" +#include "libcli/auth/libcli_auth.h" +#include "auth/credentials/credentials.h" +#include "auth/gensec/gensec.h" +#include "auth/auth.h" +#include "auth/ntlm/auth_proto.h" +#include "param/param.h" +#include "auth/session_proto.h" + +/** + * Set a username on an NTLMSSP context - ensures it is talloc()ed + * + */ + +static NTSTATUS ntlmssp_set_username(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *user) +{ + if (!user) { + /* it should be at least "" */ + DEBUG(1, ("NTLMSSP failed to set username - cannot accept NULL username\n")); + return NT_STATUS_INVALID_PARAMETER; + } + gensec_ntlmssp_state->user = talloc_strdup(gensec_ntlmssp_state, user); + if (!gensec_ntlmssp_state->user) { + return NT_STATUS_NO_MEMORY; + } + return NT_STATUS_OK; +} + +/** + * Set a domain on an NTLMSSP context - ensures it is talloc()ed + * + */ +static NTSTATUS ntlmssp_set_domain(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *domain) +{ + gensec_ntlmssp_state->domain = talloc_strdup(gensec_ntlmssp_state, domain); + if (!gensec_ntlmssp_state->domain) { + return NT_STATUS_NO_MEMORY; + } + return NT_STATUS_OK; +} + +/** + * Set a workstation on an NTLMSSP context - ensures it is talloc()ed + * + */ +static NTSTATUS ntlmssp_set_workstation(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *workstation) +{ + gensec_ntlmssp_state->workstation = talloc_strdup(gensec_ntlmssp_state, workstation); + if (!gensec_ntlmssp_state->workstation) { + return NT_STATUS_NO_MEMORY; + } + return NT_STATUS_OK; +} + +/** + * Determine correct target name flags for reply, given server role + * and negotiated flags + * + * @param gensec_ntlmssp_state NTLMSSP State + * @param neg_flags The flags from the packet + * @param chal_flags The flags to be set in the reply packet + * @return The 'target name' string. + */ + +static const char *ntlmssp_target_name(struct gensec_ntlmssp_state *gensec_ntlmssp_state, + uint32_t neg_flags, uint32_t *chal_flags) +{ + if (neg_flags & NTLMSSP_REQUEST_TARGET) { + *chal_flags |= NTLMSSP_CHAL_TARGET_INFO; + *chal_flags |= NTLMSSP_REQUEST_TARGET; + if (gensec_ntlmssp_state->server_role == ROLE_STANDALONE) { + *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER; + return gensec_ntlmssp_state->server_name; + } else { + *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN; + return gensec_ntlmssp_state->domain; + }; + } else { + return ""; + } +} + + + +/** + * Next state function for the Negotiate packet + * + * @param gensec_security GENSEC state + * @param out_mem_ctx Memory context for *out + * @param in The request, as a DATA_BLOB. reply.data must be NULL + * @param out The reply, as an allocated DATA_BLOB, caller to free. + * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required. + */ + +NTSTATUS ntlmssp_server_negotiate(struct gensec_security *gensec_security, + TALLOC_CTX *out_mem_ctx, + const DATA_BLOB in, DATA_BLOB *out) +{ + struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data; + DATA_BLOB struct_blob; + char dnsname[MAXHOSTNAMELEN], dnsdomname[MAXHOSTNAMELEN]; + const char *p; + uint32_t neg_flags = 0; + uint32_t ntlmssp_command, chal_flags; + const uint8_t *cryptkey; + const char *target_name; + + /* parse the NTLMSSP packet */ +#if 0 + file_save("ntlmssp_negotiate.dat", request.data, request.length); +#endif + + if (in.length) { + if ((in.length < 16) || !msrpc_parse(out_mem_ctx, + lp_iconv_convenience(gensec_security->lp_ctx), + &in, "Cdd", + "NTLMSSP", + &ntlmssp_command, + &neg_flags)) { + DEBUG(1, ("ntlmssp_server_negotiate: failed to parse " + "NTLMSSP Negotiate of length %u:\n", + (unsigned int)in.length )); + dump_data(2, in.data, in.length); + return NT_STATUS_INVALID_PARAMETER; + } + debug_ntlmssp_flags(neg_flags); + } + + ntlmssp_handle_neg_flags(gensec_ntlmssp_state, neg_flags, gensec_ntlmssp_state->allow_lm_key); + + /* Ask our caller what challenge they would like in the packet */ + cryptkey = gensec_ntlmssp_state->get_challenge(gensec_ntlmssp_state); + if (!cryptkey) { + DEBUG(1, ("ntlmssp_server_negotiate: backend doesn't give a challenge\n")); + return NT_STATUS_INTERNAL_ERROR; + } + + /* Check if we may set the challenge */ + if (!gensec_ntlmssp_state->may_set_challenge(gensec_ntlmssp_state)) { + gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2; + } + + /* The flags we send back are not just the negotiated flags, + * they are also 'what is in this packet'. Therfore, we + * operate on 'chal_flags' from here on + */ + + chal_flags = gensec_ntlmssp_state->neg_flags; + + /* get the right name to fill in as 'target' */ + target_name = ntlmssp_target_name(gensec_ntlmssp_state, + neg_flags, &chal_flags); + if (target_name == NULL) + return NT_STATUS_INVALID_PARAMETER; + + gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8); + gensec_ntlmssp_state->internal_chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8); + + dnsname[0] = '\0'; + if (gethostname(dnsname, sizeof(dnsname)) == -1) { + DEBUG(0,("gethostname failed\n")); + return NT_STATUS_UNSUCCESSFUL; + } + + /* This should be a 'netbios domain -> DNS domain' mapping */ + p = strchr(dnsname, '.'); + if (p != NULL) { + safe_strcpy(dnsdomname, p+1, sizeof(dnsdomname)); + strlower_m(dnsdomname); + } else { + dnsdomname[0] = '\0'; + } + + /* This creates the 'blob' of names that appears at the end of the packet */ + if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) + { + const char *target_name_dns = ""; + if (chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN) { + target_name_dns = dnsdomname; + } else if (chal_flags |= NTLMSSP_TARGET_TYPE_SERVER) { + target_name_dns = dnsname; + } + + msrpc_gen(out_mem_ctx, + lp_iconv_convenience(gensec_security->lp_ctx), + &struct_blob, "aaaaa", + NTLMSSP_NAME_TYPE_DOMAIN, target_name, + NTLMSSP_NAME_TYPE_SERVER, gensec_ntlmssp_state->server_name, + NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname, + NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname, + 0, ""); + } else { + struct_blob = data_blob(NULL, 0); + } + + { + /* Marshel the packet in the right format, be it unicode or ASCII */ + const char *gen_string; + if (gensec_ntlmssp_state->unicode) { + gen_string = "CdUdbddB"; + } else { + gen_string = "CdAdbddB"; + } + + msrpc_gen(out_mem_ctx, + lp_iconv_convenience(gensec_security->lp_ctx), + out, gen_string, + "NTLMSSP", + NTLMSSP_CHALLENGE, + target_name, + chal_flags, + cryptkey, 8, + 0, 0, + struct_blob.data, struct_blob.length); + } + + gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH; + + return NT_STATUS_MORE_PROCESSING_REQUIRED; +} + +/** + * Next state function for the Authenticate packet + * + * @param gensec_ntlmssp_state NTLMSSP State + * @param request The request, as a DATA_BLOB + * @return Errors or NT_STATUS_OK. + */ + +static NTSTATUS ntlmssp_server_preauth(struct gensec_ntlmssp_state *gensec_ntlmssp_state, + const DATA_BLOB request) +{ + uint32_t ntlmssp_command, auth_flags; + NTSTATUS nt_status; + + uint8_t session_nonce_hash[16]; + + const char *parse_string; + char *domain = NULL; + char *user = NULL; + char *workstation = NULL; + +#if 0 + file_save("ntlmssp_auth.dat", request.data, request.length); +#endif + + if (gensec_ntlmssp_state->unicode) { + parse_string = "CdBBUUUBd"; + } else { + parse_string = "CdBBAAABd"; + } + + /* zero these out */ + data_blob_free(&gensec_ntlmssp_state->lm_resp); + data_blob_free(&gensec_ntlmssp_state->nt_resp); + data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); + + gensec_ntlmssp_state->user = NULL; + gensec_ntlmssp_state->domain = NULL; + gensec_ntlmssp_state->workstation = NULL; + + /* now the NTLMSSP encoded auth hashes */ + if (!msrpc_parse(gensec_ntlmssp_state, + lp_iconv_convenience(gensec_ntlmssp_state->gensec_security->lp_ctx), + &request, parse_string, + "NTLMSSP", + &ntlmssp_command, + &gensec_ntlmssp_state->lm_resp, + &gensec_ntlmssp_state->nt_resp, + &domain, + &user, + &workstation, + &gensec_ntlmssp_state->encrypted_session_key, + &auth_flags)) { + DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n")); + dump_data(10, request.data, request.length); + + /* zero this out */ + data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); + auth_flags = 0; + + /* Try again with a shorter string (Win9X truncates this packet) */ + if (gensec_ntlmssp_state->unicode) { + parse_string = "CdBBUUU"; + } else { + parse_string = "CdBBAAA"; + } + + /* now the NTLMSSP encoded auth hashes */ + if (!msrpc_parse(gensec_ntlmssp_state, + lp_iconv_convenience(gensec_ntlmssp_state->gensec_security->lp_ctx), + &request, parse_string, + "NTLMSSP", + &ntlmssp_command, + &gensec_ntlmssp_state->lm_resp, + &gensec_ntlmssp_state->nt_resp, + &domain, + &user, + &workstation)) { + DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n")); + dump_data(2, request.data, request.length); + + return NT_STATUS_INVALID_PARAMETER; + } + } + + if (auth_flags) + ntlmssp_handle_neg_flags(gensec_ntlmssp_state, auth_flags, gensec_ntlmssp_state->allow_lm_key); + + if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(gensec_ntlmssp_state, domain))) { + /* zero this out */ + data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); + return nt_status; + } + + if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(gensec_ntlmssp_state, user))) { + /* zero this out */ + data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); + return nt_status; + } + + if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(gensec_ntlmssp_state, workstation))) { + /* zero this out */ + data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); + return nt_status; + } + + DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n", + 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)); + +#if 0 + file_save("nthash1.dat", &gensec_ntlmssp_state->nt_resp.data, &gensec_ntlmssp_state->nt_resp.length); + file_save("lmhash1.dat", &gensec_ntlmssp_state->lm_resp.data, &gensec_ntlmssp_state->lm_resp.length); +#endif + + /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a + client challenge + + However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful. + */ + if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) { + if (gensec_ntlmssp_state->nt_resp.length == 24 && gensec_ntlmssp_state->lm_resp.length == 24) { + struct MD5Context md5_session_nonce_ctx; + SMB_ASSERT(gensec_ntlmssp_state->internal_chal.data + && gensec_ntlmssp_state->internal_chal.length == 8); + + gensec_ntlmssp_state->doing_ntlm2 = true; + + memcpy(gensec_ntlmssp_state->crypt.ntlm2.session_nonce, gensec_ntlmssp_state->internal_chal.data, 8); + memcpy(&gensec_ntlmssp_state->crypt.ntlm2.session_nonce[8], gensec_ntlmssp_state->lm_resp.data, 8); + + MD5Init(&md5_session_nonce_ctx); + MD5Update(&md5_session_nonce_ctx, gensec_ntlmssp_state->crypt.ntlm2.session_nonce, 16); + MD5Final(session_nonce_hash, &md5_session_nonce_ctx); + + gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state, + session_nonce_hash, 8); + + /* LM response is no longer useful, zero it out */ + data_blob_free(&gensec_ntlmssp_state->lm_resp); + + /* We changed the effective challenge - set it */ + if (!NT_STATUS_IS_OK(nt_status = + gensec_ntlmssp_state->set_challenge(gensec_ntlmssp_state, + &gensec_ntlmssp_state->chal))) { + /* zero this out */ + data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); + return nt_status; + } + + /* LM Key is incompatible... */ + gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; + } + } + return NT_STATUS_OK; +} + +/** + * Next state function for the Authenticate packet + * (after authentication - figures out the session keys etc) + * + * @param gensec_ntlmssp_state NTLMSSP State + * @return Errors or NT_STATUS_OK. + */ + +static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security, + DATA_BLOB *user_session_key, + DATA_BLOB *lm_session_key) +{ + struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data; + NTSTATUS nt_status; + DATA_BLOB session_key = data_blob(NULL, 0); + + if (user_session_key) + dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length); + + if (lm_session_key) + dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length); + + /* Handle the different session key derivation for NTLM2 */ + if (gensec_ntlmssp_state->doing_ntlm2) { + if (user_session_key && user_session_key->data && user_session_key->length == 16) { + session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16); + hmac_md5(user_session_key->data, gensec_ntlmssp_state->crypt.ntlm2.session_nonce, + sizeof(gensec_ntlmssp_state->crypt.ntlm2.session_nonce), session_key.data); + DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n")); + dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length); + + } else { + DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n")); + session_key = data_blob(NULL, 0); + } + } else if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) + /* Ensure we can never get here on NTLMv2 */ + && (gensec_ntlmssp_state->nt_resp.length == 0 || gensec_ntlmssp_state->nt_resp.length == 24)) { + + if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) { + if (gensec_ntlmssp_state->lm_resp.data && gensec_ntlmssp_state->lm_resp.length == 24) { + session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16); + SMBsesskeygen_lm_sess_key(lm_session_key->data, gensec_ntlmssp_state->lm_resp.data, + session_key.data); + DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n")); + dump_data_pw("LM session key:\n", session_key.data, session_key.length); + } else { + + /* When there is no LM response, just use zeros */ + static const uint8_t zeros[24]; + session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16); + SMBsesskeygen_lm_sess_key(zeros, zeros, + session_key.data); + DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n")); + dump_data_pw("LM session key:\n", session_key.data, session_key.length); + } + } else { + /* LM Key not selected */ + gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; + + DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n")); + session_key = data_blob(NULL, 0); + } + + } else if (user_session_key && user_session_key->data) { + session_key = *user_session_key; + DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n")); + dump_data_pw("unmodified session key:\n", session_key.data, session_key.length); + + /* LM Key not selected */ + gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; + + } else if (lm_session_key && lm_session_key->data) { + /* Very weird to have LM key, but no user session key, but anyway.. */ + session_key = *lm_session_key; + DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n")); + dump_data_pw("unmodified session key:\n", session_key.data, session_key.length); + + /* LM Key not selected */ + gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; + + } else { + DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n")); + session_key = data_blob(NULL, 0); + + /* LM Key not selected */ + gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; + } + + /* With KEY_EXCH, the client supplies the proposed session key, + but encrypts it with the long-term key */ + if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) { + if (!gensec_ntlmssp_state->encrypted_session_key.data + || gensec_ntlmssp_state->encrypted_session_key.length != 16) { + data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); + DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n", + (unsigned)gensec_ntlmssp_state->encrypted_session_key.length)); + return NT_STATUS_INVALID_PARAMETER; + } else if (!session_key.data || session_key.length != 16) { + DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n", + (unsigned)session_key.length)); + gensec_ntlmssp_state->session_key = session_key; + } else { + dump_data_pw("KEY_EXCH session key (enc):\n", + gensec_ntlmssp_state->encrypted_session_key.data, + gensec_ntlmssp_state->encrypted_session_key.length); + arcfour_crypt(gensec_ntlmssp_state->encrypted_session_key.data, + session_key.data, + gensec_ntlmssp_state->encrypted_session_key.length); + gensec_ntlmssp_state->session_key = data_blob_talloc(gensec_ntlmssp_state, + gensec_ntlmssp_state->encrypted_session_key.data, + gensec_ntlmssp_state->encrypted_session_key.length); + dump_data_pw("KEY_EXCH session key:\n", gensec_ntlmssp_state->encrypted_session_key.data, + gensec_ntlmssp_state->encrypted_session_key.length); + } + } else { + gensec_ntlmssp_state->session_key = session_key; + } + + /* keep the session key around on the new context */ + talloc_steal(gensec_ntlmssp_state, session_key.data); + + if ((gensec_security->want_features & GENSEC_FEATURE_SIGN) + || (gensec_security->want_features & GENSEC_FEATURE_SEAL)) { + nt_status = ntlmssp_sign_init(gensec_ntlmssp_state); + } else { + nt_status = NT_STATUS_OK; + } + + data_blob_free(&gensec_ntlmssp_state->encrypted_session_key); + + /* allow arbitarily many authentications, but watch that this will cause a + memory leak, until the gensec_ntlmssp_state is shutdown + */ + + if (gensec_ntlmssp_state->server_multiple_authentications) { + gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH; + } else { + gensec_ntlmssp_state->expected_state = NTLMSSP_DONE; + } + + return nt_status; +} + + +/** + * Next state function for the Authenticate packet + * + * @param gensec_security GENSEC state + * @param out_mem_ctx Memory context for *out + * @param in The request, as a DATA_BLOB. reply.data must be NULL + * @param out The reply, as an allocated DATA_BLOB, caller to free. + * @return Errors or NT_STATUS_OK if authentication sucessful + */ + +NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security, + TALLOC_CTX *out_mem_ctx, + const DATA_BLOB in, DATA_BLOB *out) +{ + struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data; + DATA_BLOB user_session_key = data_blob(NULL, 0); + DATA_BLOB lm_session_key = data_blob(NULL, 0); + NTSTATUS nt_status; + + TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx); + if (!mem_ctx) { + return NT_STATUS_NO_MEMORY; + } + + /* zero the outbound NTLMSSP packet */ + *out = data_blob_talloc(out_mem_ctx, NULL, 0); + + if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_preauth(gensec_ntlmssp_state, in))) { + talloc_free(mem_ctx); + return nt_status; + } + + /* + * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth + * is required (by "ntlm auth = no" and "lm auth = no" being set in the + * smb.conf file) and no NTLMv2 response was sent then the password check + * will fail here. JRA. + */ + + /* Finally, actually ask if the password is OK */ + + if (!NT_STATUS_IS_OK(nt_status = gensec_ntlmssp_state->check_password(gensec_ntlmssp_state, mem_ctx, + &user_session_key, &lm_session_key))) { + talloc_free(mem_ctx); + return nt_status; + } + + if (gensec_security->want_features + & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL|GENSEC_FEATURE_SESSION_KEY)) { + nt_status = ntlmssp_server_postauth(gensec_security, &user_session_key, &lm_session_key); + talloc_free(mem_ctx); + return nt_status; + } else { + gensec_ntlmssp_state->session_key = data_blob(NULL, 0); + talloc_free(mem_ctx); + return NT_STATUS_OK; + } +} + +/** + * Return the challenge as determined by the authentication subsystem + * @return an 8 byte random challenge + */ + +static const uint8_t *auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state) +{ + NTSTATUS status; + const uint8_t *chal; + + status = auth_get_challenge(gensec_ntlmssp_state->auth_context, &chal); + if (!NT_STATUS_IS_OK(status)) { + DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n", + nt_errstr(status))); + return NULL; + } + + return chal; +} + +/** + * Some authentication methods 'fix' the challenge, so we may not be able to set it + * + * @return If the effective challenge used by the auth subsystem may be modified + */ +static bool auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state) +{ + return auth_challenge_may_be_modified(gensec_ntlmssp_state->auth_context); +} + +/** + * NTLM2 authentication modifies the effective challenge, + * @param challenge The new challenge value + */ +static NTSTATUS auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *challenge) +{ + NTSTATUS nt_status; + struct auth_context *auth_context = gensec_ntlmssp_state->auth_context; + const uint8_t *chal; + + if (challenge->length != 8) { + return NT_STATUS_INVALID_PARAMETER; + } + + chal = challenge->data; + + nt_status = auth_context_set_challenge(auth_context, chal, "NTLMSSP callback (NTLM2)"); + + return nt_status; +} + +/** + * Check the password on an NTLMSSP login. + * + * Return the session keys used on the connection. + */ + +static NTSTATUS auth_ntlmssp_check_password(struct gensec_ntlmssp_state *gensec_ntlmssp_state, + TALLOC_CTX *mem_ctx, + DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key) +{ + NTSTATUS nt_status; + struct auth_usersupplied_info *user_info = talloc(mem_ctx, struct auth_usersupplied_info); + if (!user_info) { + return NT_STATUS_NO_MEMORY; + } + + user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT; + user_info->flags = 0; + user_info->mapped_state = false; + user_info->client.account_name = gensec_ntlmssp_state->user; + user_info->client.domain_name = gensec_ntlmssp_state->domain; + user_info->workstation_name = gensec_ntlmssp_state->workstation; + user_info->remote_host = gensec_get_peer_addr(gensec_ntlmssp_state->gensec_security); + + user_info->password_state = AUTH_PASSWORD_RESPONSE; + user_info->password.response.lanman = gensec_ntlmssp_state->lm_resp; + user_info->password.response.lanman.data = talloc_steal(user_info, gensec_ntlmssp_state->lm_resp.data); + user_info->password.response.nt = gensec_ntlmssp_state->nt_resp; + user_info->password.response.nt.data = talloc_steal(user_info, gensec_ntlmssp_state->nt_resp.data); + + nt_status = auth_check_password(gensec_ntlmssp_state->auth_context, mem_ctx, + user_info, &gensec_ntlmssp_state->server_info); + talloc_free(user_info); + NT_STATUS_NOT_OK_RETURN(nt_status); + + talloc_steal(gensec_ntlmssp_state, gensec_ntlmssp_state->server_info); + + if (gensec_ntlmssp_state->server_info->user_session_key.length) { + DEBUG(10, ("Got NT session key of length %u\n", + (unsigned)gensec_ntlmssp_state->server_info->user_session_key.length)); + if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->user_session_key.data)) { + return NT_STATUS_NO_MEMORY; + } + + *user_session_key = gensec_ntlmssp_state->server_info->user_session_key; + } + if (gensec_ntlmssp_state->server_info->lm_session_key.length) { + DEBUG(10, ("Got LM session key of length %u\n", + (unsigned)gensec_ntlmssp_state->server_info->lm_session_key.length)); + if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->lm_session_key.data)) { + return NT_STATUS_NO_MEMORY; + } + + *lm_session_key = gensec_ntlmssp_state->server_info->lm_session_key; + } + return nt_status; +} + +/** + * Return the credentials of a logged on user, including session keys + * etc. + * + * Only valid after a successful authentication + * + * May only be called once per authentication. + * + */ + +NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security, + struct auth_session_info **session_info) +{ + NTSTATUS nt_status; + struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data; + + nt_status = auth_generate_session_info(gensec_ntlmssp_state, gensec_security->event_ctx, gensec_security->lp_ctx, gensec_ntlmssp_state->server_info, session_info); + NT_STATUS_NOT_OK_RETURN(nt_status); + + (*session_info)->session_key = data_blob_talloc(*session_info, + gensec_ntlmssp_state->session_key.data, + gensec_ntlmssp_state->session_key.length); + + return NT_STATUS_OK; +} + +/** + * Start NTLMSSP on the server side + * + */ +NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security) +{ + NTSTATUS nt_status; + struct gensec_ntlmssp_state *gensec_ntlmssp_state; + + nt_status = gensec_ntlmssp_start(gensec_security); + NT_STATUS_NOT_OK_RETURN(nt_status); + + gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data; + + gensec_ntlmssp_state->role = NTLMSSP_SERVER; + + gensec_ntlmssp_state->workstation = NULL; + gensec_ntlmssp_state->server_name = lp_netbios_name(gensec_security->lp_ctx); + + gensec_ntlmssp_state->domain = lp_workgroup(gensec_security->lp_ctx); + + gensec_ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE; + + gensec_ntlmssp_state->allow_lm_key = (lp_lanman_auth(gensec_security->lp_ctx) + && lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "allow_lm_key", false)); + + gensec_ntlmssp_state->server_multiple_authentications = false; + + gensec_ntlmssp_state->neg_flags = + NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_UNKNOWN_02000000; + + gensec_ntlmssp_state->lm_resp = data_blob(NULL, 0); + gensec_ntlmssp_state->nt_resp = data_blob(NULL, 0); + gensec_ntlmssp_state->encrypted_session_key = data_blob(NULL, 0); + + if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "128bit", true)) { + gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128; + } + + if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "56bit", true)) { + gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56; + } + + if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "keyexchange", true)) { + gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH; + } + + if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "alwayssign", true)) { + gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN; + } + + if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "ntlm2", true)) { + gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2; + } + + if (gensec_security->want_features & GENSEC_FEATURE_SIGN) { + gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN; + } + if (gensec_security->want_features & GENSEC_FEATURE_SEAL) { + gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL; + } + + nt_status = auth_context_create(gensec_ntlmssp_state, + gensec_security->event_ctx, + gensec_security->msg_ctx, + gensec_security->lp_ctx, + &gensec_ntlmssp_state->auth_context); + NT_STATUS_NOT_OK_RETURN(nt_status); + + gensec_ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge; + gensec_ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge; + gensec_ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge; + gensec_ntlmssp_state->check_password = auth_ntlmssp_check_password; + gensec_ntlmssp_state->server_role = lp_server_role(gensec_security->lp_ctx); + + return NT_STATUS_OK; +} + |