source4/winbind/wb_pam_auth.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Authenticate a user
   5
   6    Copyright (C) Volker Lendecke 2005
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "libcli/composite/composite.h"
  25 #include "winbind/wb_server.h"
  26 #include "smbd/service_task.h"
  27 #include "auth/credentials/credentials.h"
  28 #include "libcli/auth/libcli_auth.h"
  29 #include "librpc/gen_ndr/ndr_netlogon.h"
  30 #include "librpc/gen_ndr/ndr_netlogon_c.h"
  31 #include "librpc/gen_ndr/winbind.h"
  32 #include "param/param.h"
  33
  34 /* Oh, there is so much to keep an eye on when authenticating a user.  Oh my! */
  35 struct pam_auth_crap_state {
  36         struct composite_context *ctx;
  37         struct event_context *event_ctx;
  38         struct loadparm_context *lp_ctx;
  39
  40         struct winbind_SamLogon *req;
  41         char *unix_username;
  42
  43         struct netr_NetworkInfo ninfo;
  44         struct netr_LogonSamLogon r;
  45
  46         const char *user_name;
  47         const char *domain_name;
  48
  49         struct netr_UserSessionKey user_session_key;
  50         struct netr_LMSessionKey lm_key;
  51         DATA_BLOB info3;
  52 };
  53
  54 /*
  55  * NTLM authentication.
  56 */
  57
  58 static void pam_auth_crap_recv_logon(struct composite_context *ctx);
  59
  60 struct composite_context *wb_cmd_pam_auth_crap_send(TALLOC_CTX *mem_ctx,
  61                                                     struct wbsrv_service *service,
  62                                                     uint32_t logon_parameters,
  63                                                     const char *domain,
  64                                                     const char *user,
  65                                                     const char *workstation,
  66                                                     DATA_BLOB chal,
  67                                                     DATA_BLOB nt_resp,
  68                                                     DATA_BLOB lm_resp)
  69 {
  70         struct composite_context *result, *ctx;
  71         struct pam_auth_crap_state *state;
  72         struct netr_NetworkInfo *ninfo;
  73         DATA_BLOB tmp_nt_resp, tmp_lm_resp;
  74
  75         result = composite_create(mem_ctx, service->task->event_ctx);
  76         if (result == NULL) goto failed;
  77
  78         state = talloc(result, struct pam_auth_crap_state);
  79         if (state == NULL) goto failed;
  80         state->ctx = result;
  81         state->lp_ctx = service->task->lp_ctx;
  82         result->private_data = state;
  83
  84         state->req = talloc(state, struct winbind_SamLogon);
  85
  86         state->req->in.logon_level = 2;
  87         state->req->in.validation_level = 3;
  88         ninfo = state->req->in.logon.network = talloc(state, struct netr_NetworkInfo);
  89         if (ninfo == NULL) goto failed;
  90
  91         ninfo->identity_info.account_name.string =  talloc_strdup(state, user);
  92         ninfo->identity_info.domain_name.string =  talloc_strdup(state, domain);
  93         ninfo->identity_info.parameter_control = logon_parameters;
  94         ninfo->identity_info.logon_id_low = 0;
  95         ninfo->identity_info.logon_id_high = 0;
  96         ninfo->identity_info.workstation.string = talloc_strdup(state, workstation);
  97
  98         SMB_ASSERT(chal.length == sizeof(ninfo->challenge));
  99         memcpy(ninfo->challenge, chal.data,
 100                sizeof(ninfo->challenge));
 101
 102         tmp_nt_resp = data_blob_talloc(ninfo, nt_resp.data, nt_resp.length);
 103         if ((nt_resp.data != NULL) &&
 104             (tmp_nt_resp.data == NULL)) goto failed;
 105
 106         tmp_lm_resp = data_blob_talloc(ninfo, lm_resp.data, lm_resp.length);
 107         if ((lm_resp.data != NULL) &&
 108             (tmp_lm_resp.data == NULL)) goto failed;
 109
 110         ninfo->nt.length = tmp_nt_resp.length;
 111         ninfo->nt.data = tmp_nt_resp.data;
 112         ninfo->lm.length = tmp_lm_resp.length;
 113         ninfo->lm.data = tmp_lm_resp.data;
 114
 115         state->unix_username = NULL;
 116
 117         ctx = wb_sam_logon_send(mem_ctx, service, state->req);
 118         if (ctx == NULL) goto failed;
 119
 120         composite_continue(result, ctx, pam_auth_crap_recv_logon, state);
 121         return result;
 122
 123  failed:
 124         talloc_free(result);
 125         return NULL;
 126 }
 127
 128 /*
 129     NTLM Authentication
 130
 131     Send of a SamLogon request to authenticate a user.
 132 */
 133 static void pam_auth_crap_recv_logon(struct composite_context *ctx)
 134 {
 135         DATA_BLOB tmp_blob;
 136         enum ndr_err_code ndr_err;
 137         struct netr_SamBaseInfo *base;
 138         struct pam_auth_crap_state *state =
 139                 talloc_get_type(ctx->async.private_data,
 140                                 struct pam_auth_crap_state);
 141
 142         state->ctx->status = wb_sam_logon_recv(ctx, state, state->req);
 143         if (!composite_is_ok(state->ctx)) return;
 144
 145         ndr_err = ndr_push_struct_blob(
 146                 &tmp_blob, state, state->req->out.validation.sam3,
 147                 (ndr_push_flags_fn_t)ndr_push_netr_SamInfo3);
 148         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 149                 state->ctx->status = ndr_map_error2ntstatus(ndr_err);
 150                 if (!composite_is_ok(state->ctx)) return;
 151         }
 152
 153         /* The Samba3 protocol is a bit broken (due to non-IDL
 154          * heritage, so for compatability we must add a non-zero 4
 155          * bytes to the info3 */
 156         state->info3 = data_blob_talloc(state, NULL, tmp_blob.length+4);
 157         if (composite_nomem(state->info3.data, state->ctx)) return;
 158
 159         SIVAL(state->info3.data, 0, 1);
 160         memcpy(state->info3.data+4, tmp_blob.data, tmp_blob.length);
 161
 162         base = &state->req->out.validation.sam3->base;
 163
 164         state->user_session_key = base->key;
 165         state->lm_key = base->LMSessKey;
 166
 167         /* Give the caller the most accurate username possible.
 168          * Assists where case sensitive comparisons may be done by our
 169          * ntlm_auth callers */
 170         if (base->account_name.string) {
 171                 state->user_name = base->account_name.string;
 172                 talloc_steal(state, base->account_name.string);
 173         }
 174         if (base->domain.string) {
 175                 state->domain_name = base->domain.string;
 176                 talloc_steal(state, base->domain.string);
 177         }
 178
 179         state->unix_username = talloc_asprintf(state, "%s%s%s",
 180                                                state->domain_name,
 181                                                lp_winbind_separator(state->lp_ctx),
 182                                                state->user_name);
 183         if (composite_nomem(state->unix_username, state->ctx)) return;
 184
 185         composite_done(state->ctx);
 186 }
 187
 188 /* Having received a NTLM authentication reply, parse out the useful
 189  * reply data for the caller */
 190 NTSTATUS wb_cmd_pam_auth_crap_recv(struct composite_context *c,
 191                                    TALLOC_CTX *mem_ctx,
 192                                    DATA_BLOB *info3,
 193                                    struct netr_UserSessionKey *user_session_key,
 194                                    struct netr_LMSessionKey *lm_key,
 195                                    char **unix_username)
 196 {
 197         struct pam_auth_crap_state *state =
 198                 talloc_get_type(c->private_data, struct pam_auth_crap_state);
 199         NTSTATUS status = composite_wait(c);
 200         if (NT_STATUS_IS_OK(status)) {
 201                 info3->length = state->info3.length;
 202                 info3->data = talloc_steal(mem_ctx, state->info3.data);
 203                 *user_session_key = state->user_session_key;
 204                 *lm_key = state->lm_key;
 205                 *unix_username = talloc_steal(mem_ctx, state->unix_username);
 206         }
 207         talloc_free(state);
 208         return status;
 209 }
 210
 211 /* Handle plaintext authentication, by encrypting the password and
 212  * then sending via the NTLM calls */
 213
 214 struct composite_context *wb_cmd_pam_auth_send(TALLOC_CTX *mem_ctx,
 215                                                struct wbsrv_service *service,
 216                                                const char *domain,
 217                                                const char *user,
 218                                                const char *password)
 219 {
 220         struct cli_credentials *credentials;
 221         const char *workstation;
 222         NTSTATUS status;
 223
 224         DATA_BLOB chal, nt_resp, lm_resp, names_blob;
 225         int flags = CLI_CRED_NTLM_AUTH;
 226         if (lp_client_lanman_auth(service->task->lp_ctx)) {
 227                 flags |= CLI_CRED_LANMAN_AUTH;
 228         }
 229
 230         if (lp_client_ntlmv2_auth(service->task->lp_ctx)) {
 231                 flags |= CLI_CRED_NTLMv2_AUTH;
 232         }
 233
 234         DEBUG(5, ("wbsrv_samba3_pam_auth called\n"));
 235
 236         credentials = cli_credentials_init(mem_ctx);
 237         if (!credentials) {
 238                 return NULL;
 239         }
 240         cli_credentials_set_conf(credentials, service->task->lp_ctx);
 241         cli_credentials_set_domain(credentials, domain, CRED_SPECIFIED);
 242         cli_credentials_set_username(credentials, user, CRED_SPECIFIED);
 243
 244         cli_credentials_set_password(credentials, password, CRED_SPECIFIED);
 245
 246         chal = data_blob_talloc(mem_ctx, NULL, 8);
 247         if (!chal.data) {
 248                 return NULL;
 249         }
 250         generate_random_buffer(chal.data, chal.length);
 251         cli_credentials_get_ntlm_username_domain(credentials, mem_ctx,
 252                                                  &user, &domain);
 253         /* for best compatability with multiple vitual netbios names
 254          * on the host, this should be generated from the
 255          * cli_credentials associated with the machine account */
 256         workstation = cli_credentials_get_workstation(credentials);
 257
 258         names_blob = NTLMv2_generate_names_blob(
 259                 mem_ctx,
 260                 cli_credentials_get_workstation(credentials),
 261                 cli_credentials_get_domain(credentials));
 262
 263         status = cli_credentials_get_ntlm_response(
 264                 credentials, mem_ctx, &flags, chal, names_blob,
 265                 &lm_resp, &nt_resp, NULL, NULL);
 266         if (!NT_STATUS_IS_OK(status)) {
 267                 return NULL;
 268         }
 269         return wb_cmd_pam_auth_crap_send(mem_ctx, service,
 270                                          0 /* logon parameters */,
 271                                          domain, user, workstation,
 272                                          chal, nt_resp, lm_resp);
 273 }
 274
 275 NTSTATUS wb_cmd_pam_auth_recv(struct composite_context *c)
 276 {
 277        struct pam_auth_crap_state *state =
 278                talloc_get_type(c->private_data, struct pam_auth_crap_state);
 279        NTSTATUS status = composite_wait(c);
 280        talloc_free(state);
 281        return status;
 282 }