summaryrefslogtreecommitdiff
path: root/src/responder/nss/nsssrv.c
blob: 8fe53a8bbdc7ed1f56fc35535bef7479b3a905f2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
/*
   SSSD

   NSS Responder

   Copyright (C) Simo Sorce <ssorce@redhat.com>	2008

   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 <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <string.h>
#include <sys/time.h>
#include <errno.h>

#include "popt.h"
#include "util/util.h"
#include "responder/nss/nsssrv.h"
#include "responder/common/negcache.h"
#include "db/sysdb.h"
#include "confdb/confdb.h"
#include "dbus/dbus.h"
#include "sbus/sssd_dbus.h"
#include "responder/common/responder_packet.h"
#include "responder/common/responder.h"
#include "providers/data_provider.h"
#include "monitor/monitor_interfaces.h"
#include "sbus/sbus_client.h"

#define SSS_NSS_PIPE_NAME "nss"

#define DEFAULT_PWFIELD "*"

#define SHELL_REALLOC_INCREMENT 5
#define SHELL_REALLOC_MAX       50

struct sbus_method monitor_nss_methods[] = {
    { MON_CLI_METHOD_PING, monitor_common_pong },
    { MON_CLI_METHOD_RES_INIT, monitor_common_res_init },
    { MON_CLI_METHOD_ROTATE, responder_logrotate },
    { NULL, NULL }
};

struct sbus_interface monitor_nss_interface = {
    MONITOR_INTERFACE,
    MONITOR_PATH,
    SBUS_DEFAULT_VTABLE,
    monitor_nss_methods,
    NULL
};

static errno_t nss_get_etc_shells(TALLOC_CTX *mem_ctx, char ***_shells)
{
    int i = 0;
    char *sh;
    char **shells = NULL;
    TALLOC_CTX *tmp_ctx;
    errno_t ret;
    int size;

    tmp_ctx = talloc_new(NULL);
    if (!tmp_ctx) return ENOMEM;

    shells = talloc_array(tmp_ctx, char *, SHELL_REALLOC_INCREMENT);
    if (!shells) {
        ret = ENOMEM;
        goto done;
    }
    size = SHELL_REALLOC_INCREMENT;

    setusershell();
    while ((sh = getusershell())) {
        shells[i] = talloc_strdup(shells, sh);
        if (!shells[i]) {
            endusershell();
            ret = ENOMEM;
            goto done;
        }
        DEBUG(6, ("Found shell %s in /etc/shells\n", shells[i]));
        i++;

        if (i == size) {
            size += SHELL_REALLOC_INCREMENT;
            if (size > SHELL_REALLOC_MAX) {
                DEBUG(0, ("Reached maximum number of shells [%d]. "
                          "Users may be denied access. "
                          "Please check /etc/shells for sanity\n",
                          SHELL_REALLOC_MAX));
                break;
            }
            shells = talloc_realloc(NULL, shells, char *,
                                    size);
            if (!shells) {
                ret = ENOMEM;
                goto done;
            }
        }
    }
    endusershell();

    if (i + 1 < size) {
        shells = talloc_realloc(NULL, shells, char *, i + 1);
        if (!shells) {
            ret = ENOMEM;
            goto done;
        }
    }
    shells[i] = NULL;

    *_shells = talloc_move(mem_ctx, &shells);
    ret = EOK;
done:
    talloc_zfree(tmp_ctx);
    return ret;
}

static int nss_get_config(struct nss_ctx *nctx,
                          struct resp_ctx *rctx,
                          struct confdb_ctx *cdb)
{
    int ret;

    ret = confdb_get_int(cdb, nctx, CONFDB_NSS_CONF_ENTRY,
                         CONFDB_NSS_ENUM_CACHE_TIMEOUT, 120,
                         &nctx->enum_cache_timeout);
    if (ret != EOK) goto done;

    ret = confdb_get_int(cdb, nctx, CONFDB_NSS_CONF_ENTRY,
                         CONFDB_NSS_ENTRY_NEG_TIMEOUT, 15,
                         &nctx->neg_timeout);
    if (ret != EOK) goto done;

    ret = confdb_get_bool(cdb, nctx, CONFDB_NSS_CONF_ENTRY,
                         CONFDB_NSS_FILTER_USERS_IN_GROUPS, true,
                         &nctx->filter_users_in_groups);
    if (ret != EOK) goto done;

    ret = confdb_get_int(cdb, nctx, CONFDB_NSS_CONF_ENTRY,
                         CONFDB_NSS_ENTRY_CACHE_NOWAIT_PERCENTAGE, 0,
                         &nctx->cache_refresh_percent);
    if (ret != EOK) goto done;
    if (nctx->cache_refresh_percent < 0 ||
        nctx->cache_refresh_percent > 99) {
        DEBUG(0,("Configuration error: entry_cache_nowait_percentage is "
                 "invalid. Disabling feature.\n"));
        nctx->cache_refresh_percent = 0;
    }

    ret = sss_ncache_prepopulate(nctx->ncache, cdb, nctx->rctx->names,
                                 nctx->rctx->domains);
    if (ret != EOK) {
        goto done;
    }

    ret = confdb_get_string(cdb, nctx, CONFDB_NSS_CONF_ENTRY,
                            CONFDB_NSS_PWFIELD, DEFAULT_PWFIELD,
                            &nctx->pwfield);
    if (ret != EOK) goto done;

    ret = confdb_get_string(cdb, nctx, CONFDB_NSS_CONF_ENTRY,
                            CONFDB_NSS_OVERRIDE_HOMEDIR, NULL,
                            &nctx->override_homedir);
    if (ret != EOK) goto done;

    ret = confdb_get_string_as_list(cdb, nctx, CONFDB_NSS_CONF_ENTRY,
                                    CONFDB_NSS_ALLOWED_SHELL,
                                    &nctx->allowed_shells);
    if (ret != EOK && ret != ENOENT) goto done;

    ret = confdb_get_string_as_list(cdb, nctx, CONFDB_NSS_CONF_ENTRY,
                                    CONFDB_NSS_VETOED_SHELL,
                                    &nctx->vetoed_shells);
    if (ret != EOK && ret != ENOENT) goto done;
    ret = nss_get_etc_shells(nctx, &nctx->etc_shells);
    if (ret != EOK) goto done;

    ret = confdb_get_string(cdb, nctx, CONFDB_NSS_CONF_ENTRY,
                            CONFDB_NSS_SHELL_FALLBACK,
                            CONFDB_DEFAULT_SHELL_FALLBACK,
                            &nctx->shell_fallback);
    if (ret != EOK) goto done;

    ret = 0;
done:
    return ret;
}

static struct sbus_method nss_dp_methods[] = {
    { NULL, NULL }
};

struct sbus_interface nss_dp_interface = {
    DP_INTERFACE,
    DP_PATH,
    SBUS_DEFAULT_VTABLE,
    nss_dp_methods,
    NULL
};


static void nss_dp_reconnect_init(struct sbus_connection *conn,
                                  int status, void *pvt)
{
    struct be_conn *be_conn = talloc_get_type(pvt, struct be_conn);
    int ret;

    /* Did we reconnect successfully? */
    if (status == SBUS_RECONNECT_SUCCESS) {
        DEBUG(1, ("Reconnected to the Data Provider.\n"));

        /* Identify ourselves to the data provider */
        ret = dp_common_send_id(be_conn->conn,
                                DATA_PROVIDER_VERSION,
                                "NSS");
        /* all fine */
        if (ret == EOK) {
            handle_requests_after_reconnect();
            return;
        }
    }

    /* Failed to reconnect */
    DEBUG(0, ("Could not reconnect to %s provider.\n",
              be_conn->domain->name));

    /* FIXME: kill the frontend and let the monitor restart it ? */
    /* nss_shutdown(rctx); */
}

static int nss_ctx_destructor(void *memctx)
{
    struct nss_ctx *nctx = (struct nss_ctx *) memctx;

    if (nctx->netgroups) {
        hash_destroy(nctx->netgroups);
        nctx->netgroups = NULL;
    }
    return 0;
}

int nss_process_init(TALLOC_CTX *mem_ctx,
                     struct tevent_context *ev,
                     struct confdb_ctx *cdb)
{
    struct sss_cmd_table *nss_cmds;
    struct be_conn *iter;
    struct nss_ctx *nctx;
    int ret, max_retries;
    int hret;

    nctx = talloc_zero(mem_ctx, struct nss_ctx);
    if (!nctx) {
        DEBUG(0, ("fatal error initializing nss_ctx\n"));
        return ENOMEM;
    }
    talloc_set_destructor((TALLOC_CTX *) nctx, nss_ctx_destructor);

    ret = sss_ncache_init(nctx, &nctx->ncache);
    if (ret != EOK) {
        DEBUG(0, ("fatal error initializing negative cache\n"));
        return ret;
    }

    nss_cmds = get_nss_cmds();

    ret = sss_process_init(nctx, ev, cdb,
                           nss_cmds,
                           SSS_NSS_SOCKET_NAME, NULL,
                           CONFDB_NSS_CONF_ENTRY,
                           NSS_SBUS_SERVICE_NAME,
                           NSS_SBUS_SERVICE_VERSION,
                           &monitor_nss_interface,
                           "NSS", &nss_dp_interface,
                           &nctx->rctx);
    if (ret != EOK) {
        return ret;
    }
    nctx->rctx->pvt_ctx = nctx;

    ret = nss_get_config(nctx, nctx->rctx, cdb);
    if (ret != EOK) {
        DEBUG(0, ("fatal error getting nss config\n"));
        return ret;
    }

    /* Enable automatic reconnection to the Data Provider */
    ret = confdb_get_int(nctx->rctx->cdb, nctx->rctx,
                         CONFDB_NSS_CONF_ENTRY,
                         CONFDB_SERVICE_RECON_RETRIES,
                         3, &max_retries);
    if (ret != EOK) {
        DEBUG(0, ("Failed to set up automatic reconnection\n"));
        return ret;
    }

    for (iter = nctx->rctx->be_conns; iter; iter = iter->next) {
        sbus_reconnect_init(iter->conn, max_retries,
                            nss_dp_reconnect_init, iter);
    }

    /* Create the lookup table for netgroup results */
    hret = hash_create(10, &nctx->netgroups, NULL, NULL);
    if (hret != HASH_SUCCESS) {
        DEBUG(0,("Unable to initialize netgroup hash table\n"));
        return EIO;
    }

    DEBUG(1, ("NSS Initialization complete\n"));

    return EOK;
}

int main(int argc, const char *argv[])
{
    int opt;
    poptContext pc;
    struct main_context *main_ctx;
    int ret;

    struct poptOption long_options[] = {
        POPT_AUTOHELP
        SSSD_MAIN_OPTS
        POPT_TABLEEND
    };

    pc = poptGetContext(argv[0], argc, argv, long_options, 0);
    while((opt = poptGetNextOpt(pc)) != -1) {
        switch(opt) {
        default:
            fprintf(stderr, "\nInvalid option %s: %s\n\n",
                  poptBadOption(pc, 0), poptStrerror(opt));
            poptPrintUsage(pc, stderr, 0);
            return 1;
        }
    }

    poptFreeContext(pc);

   /* set up things like debug, signals, daemonization, etc... */
    debug_log_file = "sssd_nss";

    ret = server_setup("sssd[nss]", 0, CONFDB_NSS_CONF_ENTRY, &main_ctx);
    if (ret != EOK) return 2;

    ret = die_if_parent_died();
    if (ret != EOK) {
        /* This is not fatal, don't return */
        DEBUG(2, ("Could not set up to exit when parent process does\n"));
    }

    ret = nss_process_init(main_ctx,
                           main_ctx->event_ctx,
                           main_ctx->confdb_ctx);
    if (ret != EOK) return 3;

    /* loop on main */
    server_loop(main_ctx);

    return 0;
}