diff options
Diffstat (limited to 'source4/winbind/wb_pam_auth.c')
| -rw-r--r-- | source4/winbind/wb_pam_auth.c | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/source4/winbind/wb_pam_auth.c b/source4/winbind/wb_pam_auth.c new file mode 100644 index 0000000000..ee54bcd58f --- /dev/null +++ b/source4/winbind/wb_pam_auth.c @@ -0,0 +1,271 @@ +/* + 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(state->lp_ctx), + 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, + struct cli_credentials *credentials) +{ + const char *workstation; + NTSTATUS status; + const char *user, *domain; + 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")); + + 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, + MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT|MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT /* 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; +} |