/* Unix SMB/CIFS implementation. Authenticate a user Copyright (C) Volker Lendecke 2005 Copyright (C) Andrew Bartlett <abartlet@samba.org> 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 "libcli/composite/composite.h" #include "winbind/wb_server.h" #include "smbd/service_task.h" #include "auth/credentials/credentials.h" #include "libcli/auth/libcli_auth.h" #include "librpc/gen_ndr/ndr_netlogon.h" #include "librpc/gen_ndr/ndr_netlogon_c.h" #include "librpc/gen_ndr/winbind.h" #include "param/param.h" /* Oh, there is so much to keep an eye on when authenticating a user. Oh my! */ struct pam_auth_crap_state { struct composite_context *ctx; struct event_context *event_ctx; struct loadparm_context *lp_ctx; struct winbind_SamLogon *req; char *unix_username; struct netr_NetworkInfo ninfo; struct netr_LogonSamLogon r; const char *user_name; const char *domain_name; struct netr_UserSessionKey user_session_key; struct netr_LMSessionKey lm_key; DATA_BLOB info3; }; /* * NTLM authentication. */ static void pam_auth_crap_recv_logon(struct composite_context *ctx); struct composite_context *wb_cmd_pam_auth_crap_send(TALLOC_CTX *mem_ctx, struct wbsrv_service *service, uint32_t logon_parameters, const char *domain, const char *user, const char *workstation, DATA_BLOB chal, DATA_BLOB nt_resp, DATA_BLOB lm_resp) { struct composite_context *result, *ctx; struct pam_auth_crap_state *state; struct netr_NetworkInfo *ninfo; DATA_BLOB tmp_nt_resp, tmp_lm_resp; result = composite_create(mem_ctx, service->task->event_ctx); if (result == NULL) goto failed; state = talloc(result, struct pam_auth_crap_state); if (state == NULL) goto failed; state->ctx = result; state->lp_ctx = service->task->lp_ctx; result->private_data = state; state->req = talloc(state, struct winbind_SamLogon); state->req->in.logon_level = 2; state->req->in.validation_level = 3; ninfo = state->req->in.logon.network = talloc(state, struct netr_NetworkInfo); if (ninfo == NULL) goto failed; ninfo->identity_info.account_name.string = talloc_strdup(state, user); ninfo->identity_info.domain_name.string = talloc_strdup(state, domain); ninfo->identity_info.parameter_control = logon_parameters; ninfo->identity_info.logon_id_low = 0; ninfo->identity_info.logon_id_high = 0; ninfo->identity_info.workstation.string = talloc_strdup(state, workstation); SMB_ASSERT(chal.length == sizeof(ninfo->challenge)); memcpy(ninfo->challenge, chal.data, sizeof(ninfo->challenge)); tmp_nt_resp = data_blob_talloc(ninfo, nt_resp.data, nt_resp.length); if ((nt_resp.data != NULL) && (tmp_nt_resp.data == NULL)) goto failed; tmp_lm_resp = data_blob_talloc(ninfo, lm_resp.data, lm_resp.length); if ((lm_resp.data != NULL) && (tmp_lm_resp.data == NULL)) goto failed; ninfo->nt.length = tmp_nt_resp.length; ninfo->nt.data = tmp_nt_resp.data; ninfo->lm.length = tmp_lm_resp.length; ninfo->lm.data = tmp_lm_resp.data; state->unix_username = NULL; ctx = wb_sam_logon_send(mem_ctx, service, state->req); if (ctx == NULL) goto failed; composite_continue(result, ctx, pam_auth_crap_recv_logon, state); return result; failed: talloc_free(result); return NULL; } /* NTLM Authentication Send of a SamLogon request to authenticate a user. */ static void pam_auth_crap_recv_logon(struct composite_context *ctx) { DATA_BLOB tmp_blob; enum ndr_err_code ndr_err; struct netr_SamBaseInfo *base; struct pam_auth_crap_state *state = talloc_get_type(ctx->async.private_data, struct pam_auth_crap_state); state->ctx->status = wb_sam_logon_recv(ctx, state, state->req); if (!composite_is_ok(state->ctx)) return; ndr_err = ndr_push_struct_blob( &tmp_blob, state, lp_iconv_convenience(global_loadparm), state->req->out.validation.sam3, (ndr_push_flags_fn_t)ndr_push_netr_SamInfo3); if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { state->ctx->status = ndr_map_error2ntstatus(ndr_err); if (!composite_is_ok(state->ctx)) return; } /* The Samba3 protocol is a bit broken (due to non-IDL * heritage, so for compatability we must add a non-zero 4 * bytes to the info3 */ state->info3 = data_blob_talloc(state, NULL, tmp_blob.length+4); if (composite_nomem(state->info3.data, state->ctx)) return; SIVAL(state->info3.data, 0, 1); memcpy(state->info3.data+4, tmp_blob.data, tmp_blob.length); base = &state->req->out.validation.sam3->base; state->user_session_key = base->key; state->lm_key = base->LMSessKey; /* Give the caller the most accurate username possible. * Assists where case sensitive comparisons may be done by our * ntlm_auth callers */ if (base->account_name.string) { state->user_name = base->account_name.string; talloc_steal(state, base->account_name.string); } if (base->domain.string) { state->domain_name = base->domain.string; talloc_steal(state, base->domain.string); } state->unix_username = talloc_asprintf(state, "%s%s%s", state->domain_name, lp_winbind_separator(state->lp_ctx), state->user_name); if (composite_nomem(state->unix_username, state->ctx)) return; composite_done(state->ctx); } /* Having received a NTLM authentication reply, parse out the useful * reply data for the caller */ NTSTATUS wb_cmd_pam_auth_crap_recv(struct composite_context *c, TALLOC_CTX *mem_ctx, DATA_BLOB *info3, struct netr_UserSessionKey *user_session_key, struct netr_LMSessionKey *lm_key, char **unix_username) { struct pam_auth_crap_state *state = talloc_get_type(c->private_data, struct pam_auth_crap_state); NTSTATUS status = composite_wait(c); if (NT_STATUS_IS_OK(status)) { info3->length = state->info3.length; info3->data = talloc_steal(mem_ctx, state->info3.data); *user_session_key = state->user_session_key; *lm_key = state->lm_key; *unix_username = talloc_steal(mem_ctx, state->unix_username); } talloc_free(state); return status; } /* Handle plaintext authentication, by encrypting the password and * then sending via the NTLM calls */ struct composite_context *wb_cmd_pam_auth_send(TALLOC_CTX *mem_ctx, struct wbsrv_service *service, const char *domain, const char *user, const char *password) { struct cli_credentials *credentials; const char *workstation; NTSTATUS status; DATA_BLOB chal, nt_resp, lm_resp, names_blob; int flags = CLI_CRED_NTLM_AUTH; if (lp_client_lanman_auth(service->task->lp_ctx)) { flags |= CLI_CRED_LANMAN_AUTH; } if (lp_client_ntlmv2_auth(service->task->lp_ctx)) { flags |= CLI_CRED_NTLMv2_AUTH; } DEBUG(5, ("wbsrv_samba3_pam_auth called\n")); credentials = cli_credentials_init(mem_ctx); if (!credentials) { return NULL; } cli_credentials_set_conf(credentials, service->task->lp_ctx); cli_credentials_set_domain(credentials, domain, CRED_SPECIFIED); cli_credentials_set_username(credentials, user, CRED_SPECIFIED); cli_credentials_set_password(credentials, password, CRED_SPECIFIED); chal = data_blob_talloc(mem_ctx, NULL, 8); if (!chal.data) { return NULL; } generate_random_buffer(chal.data, chal.length); cli_credentials_get_ntlm_username_domain(credentials, mem_ctx, &user, &domain); /* for best compatability with multiple vitual netbios names * on the host, this should be generated from the * cli_credentials associated with the machine account */ workstation = cli_credentials_get_workstation(credentials); names_blob = NTLMv2_generate_names_blob( mem_ctx, lp_iconv_convenience(service->task->lp_ctx), cli_credentials_get_workstation(credentials), cli_credentials_get_domain(credentials)); status = cli_credentials_get_ntlm_response( credentials, mem_ctx, &flags, chal, names_blob, &lm_resp, &nt_resp, NULL, NULL); if (!NT_STATUS_IS_OK(status)) { return NULL; } return wb_cmd_pam_auth_crap_send(mem_ctx, service, 0 /* logon parameters */, domain, user, workstation, chal, nt_resp, lm_resp); } NTSTATUS wb_cmd_pam_auth_recv(struct composite_context *c) { struct pam_auth_crap_state *state = talloc_get_type(c->private_data, struct pam_auth_crap_state); NTSTATUS status = composite_wait(c); talloc_free(state); return status; }