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 "param/param.h"
  31
  32 /* Oh, there is so much to keep an eye on when authenticating a user.  Oh my! */
  33 struct pam_auth_crap_state {
  34         struct composite_context *ctx;
  35         struct tevent_context *event_ctx;
  36         struct loadparm_context *lp_ctx;
  37
  38         struct winbind_SamLogon *req;
  39         char *unix_username;
  40
  41         struct netr_NetworkInfo ninfo;
  42         struct netr_LogonSamLogon r;
  43
  44         const char *user_name;
  45         const char *domain_name;
  46
  47         struct netr_UserSessionKey user_session_key;
  48         struct netr_LMSessionKey lm_key;
  49         DATA_BLOB info3;
  50 };
  51
  52 /*
  53  * NTLM authentication.
  54 */
  55
  56 static void pam_auth_crap_recv_logon(struct composite_context *ctx);
  57
  58 struct composite_context *wb_cmd_pam_auth_crap_send(TALLOC_CTX *mem_ctx,
  59                                                     struct wbsrv_service *service,
  60                                                     uint32_t logon_parameters,
  61                                                     const char *domain,
  62                                                     const char *user,
  63                                                     const char *workstation,
  64                                                     DATA_BLOB chal,
  65                                                     DATA_BLOB nt_resp,
  66                                                     DATA_BLOB lm_resp)
  67 {
  68         struct composite_context *result, *ctx;
  69         struct pam_auth_crap_state *state;
  70         struct netr_NetworkInfo *ninfo;
  71         DATA_BLOB tmp_nt_resp, tmp_lm_resp;
  72
  73         result = composite_create(mem_ctx, service->task->event_ctx);
  74         if (result == NULL) goto failed;
  75
  76         state = talloc(result, struct pam_auth_crap_state);
  77         if (state == NULL) goto failed;
  78         state->ctx = result;
  79         state->lp_ctx = service->task->lp_ctx;
  80         result->private_data = state;
  81
  82         state->req = talloc(state, struct winbind_SamLogon);
  83
  84         state->req->in.logon_level = 2;
  85         state->req->in.validation_level = 3;
  86         ninfo = state->req->in.logon.network = talloc(state, struct netr_NetworkInfo);
  87         if (ninfo == NULL) goto failed;
  88
  89         ninfo->identity_info.account_name.string =  talloc_strdup(state, user);
  90         ninfo->identity_info.domain_name.string =  talloc_strdup(state, domain);
  91         ninfo->identity_info.parameter_control = logon_parameters;
  92         ninfo->identity_info.logon_id_low = 0;
  93         ninfo->identity_info.logon_id_high = 0;
  94         ninfo->identity_info.workstation.string = talloc_strdup(state, workstation);
  95
  96         SMB_ASSERT(chal.length == sizeof(ninfo->challenge));
  97         memcpy(ninfo->challenge, chal.data,
  98                sizeof(ninfo->challenge));
  99
 100         tmp_nt_resp = data_blob_talloc(ninfo, nt_resp.data, nt_resp.length);
 101         if ((nt_resp.data != NULL) &&
 102             (tmp_nt_resp.data == NULL)) goto failed;
 103
 104         tmp_lm_resp = data_blob_talloc(ninfo, lm_resp.data, lm_resp.length);
 105         if ((lm_resp.data != NULL) &&
 106             (tmp_lm_resp.data == NULL)) goto failed;
 107
 108         ninfo->nt.length = tmp_nt_resp.length;
 109         ninfo->nt.data = tmp_nt_resp.data;
 110         ninfo->lm.length = tmp_lm_resp.length;
 111         ninfo->lm.data = tmp_lm_resp.data;
 112
 113         state->unix_username = NULL;
 114
 115         ctx = wb_sam_logon_send(mem_ctx, service, state->req);
 116         if (ctx == NULL) goto failed;
 117
 118         composite_continue(result, ctx, pam_auth_crap_recv_logon, state);
 119         return result;
 120
 121  failed:
 122         talloc_free(result);
 123         return NULL;
 124 }
 125
 126 /*
 127     NTLM Authentication
 128
 129     Send of a SamLogon request to authenticate a user.
 130 */
 131 static void pam_auth_crap_recv_logon(struct composite_context *ctx)
 132 {
 133         DATA_BLOB tmp_blob;
 134         enum ndr_err_code ndr_err;
 135         struct netr_SamBaseInfo *base;
 136         struct pam_auth_crap_state *state =
 137                 talloc_get_type(ctx->async.private_data,
 138                                 struct pam_auth_crap_state);
 139
 140         state->ctx->status = wb_sam_logon_recv(ctx, state, state->req);
 141         if (!composite_is_ok(state->ctx)) return;
 142
 143         ndr_err = ndr_push_struct_blob(
 144                 &tmp_blob, state, lp_iconv_convenience(state->lp_ctx),
 145                 state->req->out.validation.sam3,
 146                 (ndr_push_flags_fn_t)ndr_push_netr_SamInfo3);
 147         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 148                 state->ctx->status = ndr_map_error2ntstatus(ndr_err);
 149                 if (!composite_is_ok(state->ctx)) return;
 150         }
 151
 152         /* The Samba3 protocol is a bit broken (due to non-IDL
 153          * heritage, so for compatability we must add a non-zero 4
 154          * bytes to the info3 */
 155         state->info3 = data_blob_talloc(state, NULL, tmp_blob.length+4);
 156         if (composite_nomem(state->info3.data, state->ctx)) return;
 157
 158         SIVAL(state->info3.data, 0, 1);
 159         memcpy(state->info3.data+4, tmp_blob.data, tmp_blob.length);
 160
 161         base = &state->req->out.validation.sam3->base;
 162
 163         state->user_session_key = base->key;
 164         state->lm_key = base->LMSessKey;
 165
 166         /* Give the caller the most accurate username possible.
 167          * Assists where case sensitive comparisons may be done by our
 168          * ntlm_auth callers */
 169         if (base->account_name.string) {
 170                 state->user_name = base->account_name.string;
 171                 talloc_steal(state, base->account_name.string);
 172         }
 173         if (base->domain.string) {
 174                 state->domain_name = base->domain.string;
 175                 talloc_steal(state, base->domain.string);
 176         }
 177
 178         state->unix_username = talloc_asprintf(state, "%s%s%s",
 179                                                state->domain_name,
 180                                                lp_winbind_separator(state->lp_ctx),
 181                                                state->user_name);
 182         if (composite_nomem(state->unix_username, state->ctx)) return;
 183
 184         composite_done(state->ctx);
 185 }
 186
 187 /* Having received a NTLM authentication reply, parse out the useful
 188  * reply data for the caller */
 189 NTSTATUS wb_cmd_pam_auth_crap_recv(struct composite_context *c,
 190                                    TALLOC_CTX *mem_ctx,
 191                                    DATA_BLOB *info3,
 192                                    struct netr_UserSessionKey *user_session_key,
 193                                    struct netr_LMSessionKey *lm_key,
 194                                    char **unix_username)
 195 {
 196         struct pam_auth_crap_state *state =
 197                 talloc_get_type(c->private_data, struct pam_auth_crap_state);
 198         NTSTATUS status = composite_wait(c);
 199         if (NT_STATUS_IS_OK(status)) {
 200                 info3->length = state->info3.length;
 201                 info3->data = talloc_steal(mem_ctx, state->info3.data);
 202                 *user_session_key = state->user_session_key;
 203                 *lm_key = state->lm_key;
 204                 *unix_username = talloc_steal(mem_ctx, state->unix_username);
 205         }
 206         talloc_free(state);
 207         return status;
 208 }
 209
 210 /* Handle plaintext authentication, by encrypting the password and
 211  * then sending via the NTLM calls */
 212
 213 struct composite_context *wb_cmd_pam_auth_send(TALLOC_CTX *mem_ctx,
 214                                                struct wbsrv_service *service,
 215                                                struct cli_credentials *credentials)
 216 {
 217         const char *workstation;
 218         NTSTATUS status;
 219         const char *user, *domain;
 220         DATA_BLOB chal, nt_resp, lm_resp, names_blob;
 221         int flags = CLI_CRED_NTLM_AUTH;
 222         if (lp_client_lanman_auth(service->task->lp_ctx)) {
 223                 flags |= CLI_CRED_LANMAN_AUTH;
 224         }
 225
 226         if (lp_client_ntlmv2_auth(service->task->lp_ctx)) {
 227                 flags |= CLI_CRED_NTLMv2_AUTH;
 228         }
 229
 230         DEBUG(5, ("wbsrv_samba3_pam_auth called\n"));
 231
 232         chal = data_blob_talloc(mem_ctx, NULL, 8);
 233         if (!chal.data) {
 234                 return NULL;
 235         }
 236         generate_random_buffer(chal.data, chal.length);
 237         cli_credentials_get_ntlm_username_domain(credentials, mem_ctx,
 238                                                  &user, &domain);
 239         /* for best compatability with multiple vitual netbios names
 240          * on the host, this should be generated from the
 241          * cli_credentials associated with the machine account */
 242         workstation = cli_credentials_get_workstation(credentials);
 243
 244         names_blob = NTLMv2_generate_names_blob(
 245                 mem_ctx,
 246                 cli_credentials_get_workstation(credentials),
 247                 cli_credentials_get_domain(credentials));
 248
 249         status = cli_credentials_get_ntlm_response(
 250                 credentials, mem_ctx, &flags, chal, names_blob,
 251                 &lm_resp, &nt_resp, NULL, NULL);
 252         if (!NT_STATUS_IS_OK(status)) {
 253                 return NULL;
 254         }
 255         return wb_cmd_pam_auth_crap_send(mem_ctx, service,
 256                                          MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT|MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT /* logon parameters */,
 257                                          domain, user, workstation,
 258                                          chal, nt_resp, lm_resp);
 259 }
 260
 261 NTSTATUS wb_cmd_pam_auth_recv(struct composite_context *c,
 262                               TALLOC_CTX *mem_ctx,
 263                               DATA_BLOB *info3,
 264                               struct netr_UserSessionKey *user_session_key,
 265                               struct netr_LMSessionKey *lm_key,
 266                               char **unix_username)
 267 {
 268         struct pam_auth_crap_state *state =
 269                 talloc_get_type(c->private_data, struct pam_auth_crap_state);
 270         NTSTATUS status = composite_wait(c);
 271         if (NT_STATUS_IS_OK(status)) {
 272                 if (info3) {
 273                         info3->length = state->info3.length;
 274                         info3->data = talloc_steal(mem_ctx, state->info3.data);
 275                 }
 276                 if (user_session_key) {
 277                         *user_session_key = state->user_session_key;
 278                 }
 279                 if (lm_key) {
 280                         *lm_key = state->lm_key;
 281                 }
 282                 if (unix_username) {
 283                         *unix_username = talloc_steal(mem_ctx, state->unix_username);
 284                 }
 285         }
 286         talloc_free(state);
 287         return status;
 288 }