summaryrefslogtreecommitdiff
path: root/server/responder/common/responder_dp.c
blob: fd13208fc4707940e5055c9b3316ad36a1cf9ea4 (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
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401

#include <sys/time.h>
#include <time.h>
#include "util/util.h"
#include "responder/common/responder_packet.h"
#include "responder/common/responder.h"
#include "providers/data_provider.h"
#include "sbus/sbus_client.h"
#include "providers/dp_sbus.h"

struct sss_dp_pvt_ctx {
    struct resp_ctx *rctx;
    struct sbus_interface *intf;

    uint16_t cli_type;
    uint16_t cli_version;
    const char *cli_name;
    const char *cli_domain;

    time_t last_retry;
    int retries;
};

static int sss_dp_conn_destructor(void *data);
static void sss_dp_reconnect(struct tevent_context *ev,
                             struct tevent_timer *te,
                             struct timeval tv, void *data);

static void sss_dp_conn_reconnect(struct sss_dp_pvt_ctx *pvt)
{
    struct resp_ctx *rctx;
    struct tevent_timer *te;
    struct timeval tv;
    char *sbus_address;
    time_t now;
    int ret;

    now = time(NULL);

    /* reset retry if last reconnect was > 60 sec. ago */
    if (pvt->last_retry + 60 < now) pvt->retries = 0;
    if (pvt->retries >= 3) {
        DEBUG(4, ("Too many reconnect retries! Giving up\n"));
        return;
    }

    pvt->last_retry = now;
    pvt->retries++;

    rctx = pvt->rctx;

    ret = dp_get_sbus_address(rctx, rctx->cdb, &sbus_address);
    if (ret != EOK) {
        DEBUG(0, ("Could not locate data provider address.\n"));
        return;
    }

    ret = sbus_client_init(rctx, rctx->ev, sbus_address,
                           pvt->intf, &rctx->dp_conn,
                           sss_dp_conn_destructor, pvt);

    if (ret == EOK) {
        /* Identify ourselves to the data provider */
        ret = dp_common_send_id(rctx->dp_conn,
                                pvt->cli_type, pvt->cli_version,
                                pvt->cli_name, pvt->cli_domain);
        if (ret != EOK) {
            DEBUG(0, ("Failed to identify to the data provider!\n"));
        }
    }

    if (ret != EOK) {
        DEBUG(4, ("Failed to reconnect [%d(%s)]!\n", ret, strerror(ret)));

        tv.tv_sec = now +5;
        tv.tv_usec = 0;
        te = tevent_add_timer(rctx->ev, rctx, tv, sss_dp_reconnect, pvt);
        if (te == NULL) {
            DEBUG(4, ("Failed to add timed event! Giving up\n"));
        } else {
            DEBUG(4, ("Retrying in 5 seconds\n"));
        }
    }
}

static void sss_dp_reconnect(struct tevent_context *ev,
                             struct tevent_timer *te,
                             struct timeval tv, void *data)
{
    struct sss_dp_pvt_ctx *pvt;

    pvt = talloc_get_type(data, struct sss_dp_pvt_ctx);

    sss_dp_conn_reconnect(pvt);
}

int sss_dp_conn_destructor(void *data)
{
    struct sss_dp_pvt_ctx *pvt;
    struct sbus_connection *conn;

    conn = talloc_get_type(data, struct sbus_connection);
    if (!conn) return 0;

    /* if this is a regular disconnect just quit */
    if (sbus_conn_disconnecting(conn)) return 0;

    pvt = talloc_get_type(sbus_conn_get_private_data(conn),
                          struct sss_dp_pvt_ctx);
    if (pvt) return 0;

    sss_dp_conn_reconnect(pvt);

    return 0;
}

int sss_dp_init(struct resp_ctx *rctx, struct sbus_interface *dp_intf,
                uint16_t cli_type, uint16_t cli_version,
                const char *cli_name, const char *cli_domain)
{
    struct sss_dp_pvt_ctx *pvt;

    pvt = talloc_zero(rctx, struct sss_dp_pvt_ctx);
    if (!pvt) return ENOMEM;

    pvt->rctx = rctx;
    pvt->intf = dp_intf;
    pvt->cli_type = cli_type;
    pvt->cli_version = cli_version;
    pvt->cli_name = talloc_strdup(pvt, cli_name);
    if (!pvt->cli_name) return ENOMEM;
    pvt->cli_domain = talloc_strdup(pvt, cli_domain);
    if (!pvt->cli_domain) return ENOMEM;

    sss_dp_conn_reconnect(pvt);

    return EOK;
}


struct nss_dp_req {
    nss_dp_callback_t callback;
    void *callback_ctx;
    struct tevent_timer *te;
    DBusPendingCall *pending_reply;
};

static int nss_dp_req_destructor(void *ptr)
{
    struct nss_dp_req *req = talloc_get_type(ptr, struct nss_dp_req);

    if (req->pending_reply) {
        dbus_pending_call_cancel(req->pending_reply);
    }

    return 0;
}

static void nss_dp_send_acct_timeout(struct tevent_context *ev,
                                     struct tevent_timer *te,
                                     struct timeval t, void *data)
{
    struct nss_dp_req *ndp_req;
    dbus_uint16_t err_maj = DP_ERR_TIMEOUT;
    dbus_uint32_t err_min = EIO;
    const char *err_msg = "Request timed out";

    ndp_req = talloc_get_type(data, struct nss_dp_req);

    ndp_req->callback(err_maj, err_min, err_msg, ndp_req->callback_ctx);

    talloc_free(ndp_req);
}

static int nss_dp_get_reply(DBusPendingCall *pending,
                            dbus_uint16_t *err_maj,
                            dbus_uint32_t *err_min,
                            const char **err_msg);

static void nss_dp_send_acct_callback(DBusPendingCall *pending, void *ptr)
{
    struct nss_dp_req *ndp_req;
    dbus_uint16_t err_maj;
    dbus_uint32_t err_min;
    const char *err_msg;
    int ret;

    ndp_req = talloc_get_type(ptr, struct nss_dp_req);

    /* free timeout event and remove request destructor */
    talloc_free(ndp_req->te);
    talloc_set_destructor(ndp_req, NULL);

    ret = nss_dp_get_reply(pending, &err_maj, &err_min, &err_msg);
    if (ret != EOK) {
        err_maj = DP_ERR_FATAL;
        err_min = ret;
        err_msg = "Failed to get reply from Data Provider";
    }

    ndp_req->callback(err_maj, err_min, err_msg, ndp_req->callback_ctx);

    talloc_free(ndp_req);
}

int nss_dp_send_acct_req(struct resp_ctx *rctx, TALLOC_CTX *memctx,
                         nss_dp_callback_t callback, void *callback_ctx,
                         int timeout, const char *domain, int type,
                         const char *opt_name, uint32_t opt_id)
{
    struct nss_dp_req *ndp_req;
    DBusMessage *msg;
    DBusPendingCall *pending_reply;
    DBusConnection *dbus_conn;
    dbus_bool_t ret;
    uint32_t be_type;
    const char *attrs = "core";
    char *filter;
    struct timeval tv;

    /* either, or, not both */
    if (opt_name && opt_id) {
        return EINVAL;
    }

    if (!domain) {
        return EINVAL;
    }

    switch (type) {
    case NSS_DP_USER:
        be_type = BE_REQ_USER;
        break;
    case NSS_DP_GROUP:
        be_type = BE_REQ_GROUP;
        break;
    case NSS_DP_INITGROUPS:
        be_type = BE_REQ_INITGROUPS;
        break;
    default:
        return EINVAL;
    }

    if (opt_name) {
        filter = talloc_asprintf(memctx, "name=%s", opt_name);
    } else if (opt_id) {
        filter = talloc_asprintf(memctx, "idnumber=%u", opt_id);
    } else {
        filter = talloc_strdup(memctx, "name=*");
    }
    if (!filter) {
        return ENOMEM;
    }

    /* double check dp_ctx has actually been initialized.
     * in some pathological cases it may happen that nss starts up before
     * dp connection code is actually able to establish a connection.
     */
    if (!rctx->dp_conn) {
        DEBUG(1, ("The Data Provider connection is not available yet!"
                  " This maybe a bug, it shouldn't happen!\n"));
        return EIO;
    }
    dbus_conn = sbus_get_connection(rctx->dp_conn);

    /* create the message */
    msg = dbus_message_new_method_call(NULL,
                                       DP_CLI_PATH,
                                       DP_CLI_INTERFACE,
                                       DP_SRV_METHOD_GETACCTINFO);
    if (msg == NULL) {
        DEBUG(0,("Out of memory?!\n"));
        return ENOMEM;
    }

    DEBUG(4, ("Sending request for [%s][%u][%s][%s]\n",
              domain, be_type, attrs, filter));

    ret = dbus_message_append_args(msg,
                                   DBUS_TYPE_STRING, &domain,
                                   DBUS_TYPE_UINT32, &be_type,
                                   DBUS_TYPE_STRING, &attrs,
                                   DBUS_TYPE_STRING, &filter,
                                   DBUS_TYPE_INVALID);
    if (!ret) {
        DEBUG(1,("Failed to build message\n"));
        return EIO;
    }

    ret = dbus_connection_send_with_reply(dbus_conn, msg, &pending_reply,
                                            600000 /* TODO: set timeout */);
    if (!ret || pending_reply == NULL) {
        /*
         * Critical Failure
         * We can't communicate on this connection
         * We'll drop it using the default destructor.
         */
        DEBUG(0, ("D-BUS send failed.\n"));
        dbus_message_unref(msg);
        return EIO;
    }

    ndp_req = talloc_zero(memctx, struct nss_dp_req);
    if (!ndp_req) {
        dbus_message_unref(msg);
        return ENOMEM;
    }
    ndp_req->callback = callback;
    ndp_req->callback_ctx = callback_ctx;

    /* set up destructor */
    ndp_req->pending_reply = pending_reply;
    talloc_set_destructor((TALLOC_CTX *)ndp_req, nss_dp_req_destructor);

    /* setup the timeout handler */
    gettimeofday(&tv, NULL);
    tv.tv_sec += timeout/1000;
    tv.tv_usec += (timeout%1000) * 1000;
    ndp_req->te = tevent_add_timer(rctx->ev, memctx, tv,
                                   nss_dp_send_acct_timeout, ndp_req);

    /* Set up the reply handler */
    dbus_pending_call_set_notify(pending_reply,
                                 nss_dp_send_acct_callback,
                                 ndp_req, NULL);
    dbus_message_unref(msg);

    return EOK;
}

static int nss_dp_get_reply(DBusPendingCall *pending,
                            dbus_uint16_t *err_maj,
                            dbus_uint32_t *err_min,
                            const char **err_msg)
{
    DBusMessage *reply;
    DBusError dbus_error;
    dbus_bool_t ret;
    int type;
    int err = EOK;

    dbus_error_init(&dbus_error);

    reply = dbus_pending_call_steal_reply(pending);
    if (!reply) {
        /* reply should never be null. This function shouldn't be called
         * until reply is valid or timeout has occurred. If reply is NULL
         * here, something is seriously wrong and we should bail out.
         */
        DEBUG(0, ("Severe error. A reply callback was called but no reply was received and no timeout occurred\n"));

        /* FIXME: Destroy this connection ? */
        err = EIO;
        goto done;
    }

    type = dbus_message_get_type(reply);
    switch (type) {
    case DBUS_MESSAGE_TYPE_METHOD_RETURN:
        ret = dbus_message_get_args(reply, &dbus_error,
                                    DBUS_TYPE_UINT16, err_maj,
                                    DBUS_TYPE_UINT32, err_min,
                                    DBUS_TYPE_STRING, err_msg,
                                    DBUS_TYPE_INVALID);
        if (!ret) {
            DEBUG(1,("Filed to parse message\n"));
            /* FIXME: Destroy this connection ? */
            if (dbus_error_is_set(&dbus_error)) dbus_error_free(&dbus_error);
            err = EIO;
            goto done;
        }

        DEBUG(4, ("Got reply (%u, %u, %s) from Data Provider\n",
                  (unsigned int)*err_maj, (unsigned int)*err_min, *err_msg));

        break;

    case DBUS_MESSAGE_TYPE_ERROR:
        DEBUG(0,("The Data Provider returned an error [%s]\n",
                 dbus_message_get_error_name(reply)));
        /* Falling through to default intentionally*/
    default:
        /*
         * Timeout or other error occurred or something
         * unexpected happened.
         * It doesn't matter which, because either way we
         * know that this connection isn't trustworthy.
         * We'll destroy it now.
         */

        /* FIXME: Destroy this connection ? */
        err = EIO;
    }

done:
    dbus_pending_call_unref(pending);
    dbus_message_unref(reply);

    return err;
}