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