summaryrefslogtreecommitdiff
path: root/src/responder/sudo/sudosrv_query.c
blob: 824f682c6c753bc47f303af09f03363ad79af987 (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
/*
    Authors:
        Pavel Březina <pbrezina@redhat.com>

    Copyright (C) 2011 Red Hat

    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 <string.h>
#include <stdint.h>
#include <errno.h>
#include <talloc.h>

#include "util/util.h"
#include "responder/sudo/sudosrv_private.h"

static int sudosrv_response_append_string(TALLOC_CTX *mem_ctx,
                                          const char *str,
                                          size_t str_len,
                                          uint8_t **_response_body,
                                          size_t *_response_len)
{
    size_t response_len = *_response_len;
    uint8_t *response_body = *_response_body;

    response_body = talloc_realloc(mem_ctx, response_body, uint8_t,
                                   response_len + (str_len * sizeof(char)));
    if (response_body == NULL) {
        DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_realloc() failed\n"));
        return ENOMEM;
    }
    memcpy(response_body + response_len, str, str_len);
    response_len += str_len;

    *_response_body = response_body;
    *_response_len = response_len;

    return EOK;
}

static int sudosrv_response_append_uint32(TALLOC_CTX *mem_ctx,
                                          uint32_t number,
                                          uint8_t **_response_body,
                                          size_t *_response_len)
{
    size_t response_len = *_response_len;
    uint8_t *response_body = *_response_body;

    response_body = talloc_realloc(mem_ctx, response_body, uint8_t,
                                   response_len + sizeof(int));
    if (response_body == NULL) {
        DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_realloc() failed\n"));
        return ENOMEM;
    }
    SAFEALIGN_SET_UINT32(response_body + response_len, number, &response_len);

    *_response_body = response_body;
    *_response_len = response_len;

    return EOK;
}

static int sudosrv_response_append_attr(TALLOC_CTX *mem_ctx,
                                        const char *name,
                                        unsigned int values_num,
                                        struct ldb_val *values,
                                        uint8_t **_response_body,
                                        size_t *_response_len)
{
    uint8_t *response_body = *_response_body;
    size_t response_len = *_response_len;
    TALLOC_CTX *tmp_ctx = NULL;
    int i = 0;
    int ret = EOK;

    tmp_ctx = talloc_new(NULL);
    if (tmp_ctx == NULL) {
        DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_new() failed\n"));
        return ENOMEM;
    }

    /* attr name */
    ret = sudosrv_response_append_string(tmp_ctx, name, strlen(name) + 1,
                                         &response_body, &response_len);
    if (ret != EOK) {
        goto done;
    }

    /* values count */
    ret = sudosrv_response_append_uint32(tmp_ctx, values_num,
                                         &response_body, &response_len);
    if (ret != EOK) {
        goto done;
    }

    /* values */
    for (i = 0; i < values_num; i++) {
        if (strlen((char*)(values[i].data)) != values[i].length) {
            DEBUG(SSSDBG_CRIT_FAILURE, ("value is not a string"));
            ret = EINVAL;
            goto done;
        }

        ret = sudosrv_response_append_string(tmp_ctx,
                                             (const char*)values[i].data,
                                             values[i].length + 1,
                                             &response_body, &response_len);
        if (ret != EOK) {
            goto done;
        }
    }

    *_response_body = talloc_steal(mem_ctx, response_body);
    *_response_len = response_len;

    ret = EOK;

done:
    talloc_free(tmp_ctx);
    return ret;
}

static int sudosrv_response_append_rule(TALLOC_CTX *mem_ctx,
                                        int attrs_num,
                                        struct ldb_message_element *attrs,
                                        uint8_t **_response_body,
                                        size_t *_response_len)
{
    uint8_t *response_body = *_response_body;
    size_t response_len = *_response_len;
    TALLOC_CTX *tmp_ctx = NULL;
    int i = 0;
    int ret = EOK;

    tmp_ctx = talloc_new(NULL);
    if (tmp_ctx == NULL) {
        DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_new() failed\n"));
        return ENOMEM;
    }

    /* attrs count */
    ret = sudosrv_response_append_uint32(tmp_ctx, attrs_num,
                                         &response_body, &response_len);
    if (ret != EOK) {
        goto done;
    }

    /* attrs */
    for (i = 0; i < attrs_num; i++) {
        ret = sudosrv_response_append_attr(tmp_ctx, attrs[i].name,
                                           attrs[i].num_values, attrs[i].values,
                                           &response_body, &response_len);
        if (ret != EOK) {
            goto done;
        }
    }

    *_response_body = talloc_steal(mem_ctx, response_body);
    *_response_len = response_len;

    ret = EOK;

done:
    talloc_free(tmp_ctx);
    return ret;
}

/*
 * Response format:
 * <error_code(uint32_t)><domain(char*)>\0<num_entries(uint32_t)><rule1><rule2>...
 * <ruleN> = <num_attrs(uint32_t)><attr1><attr2>...
 * <attrN>  = <name(char*)>\0<num_values(uint32_t)><value1(char*)>\0<value2(char*)>\0...
 *
 * if <error_code> is not SSS_SUDO_ERROR_OK, the rest of the data is skipped.
 */
errno_t sudosrv_build_response(TALLOC_CTX *mem_ctx,
                               uint32_t error,
                               const char *domain,
                               int rules_num,
                               struct sysdb_attrs **rules,
                               uint8_t **_response_body,
                               size_t *_response_len)
{
    uint8_t *response_body = NULL;
    size_t response_len = 0;
    TALLOC_CTX *tmp_ctx = NULL;
    int i = 0;
    errno_t ret = EOK;

    tmp_ctx = talloc_new(NULL);
    if (tmp_ctx == NULL) {
        DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_new() failed\n"));
        return ENOMEM;
    }

    /* error code */
    ret = sudosrv_response_append_uint32(tmp_ctx, error,
                                         &response_body, &response_len);
    if (ret != EOK) {
        goto fail;
    }

    if (error != SSS_SUDO_ERROR_OK) {
        goto done;
    }

    /* domain name */
    ret = sudosrv_response_append_string(tmp_ctx, domain, strlen(domain) + 1,
                                         &response_body, &response_len);
    if (ret != EOK) {
        goto fail;
    }

    /* rules count */
    ret = sudosrv_response_append_uint32(tmp_ctx, (uint32_t)rules_num,
                                         &response_body, &response_len);
    if (ret != EOK) {
        goto fail;
    }

    /* rules */
    for (i = 0; i < rules_num; i++) {
        ret = sudosrv_response_append_rule(tmp_ctx, rules[i]->num, rules[i]->a,
                                           &response_body, &response_len);
        if (ret != EOK) {
            goto fail;
        }
    }

done:
    *_response_body = talloc_steal(mem_ctx, response_body);
    *_response_len = response_len;

    ret = EOK;

fail:
    talloc_free(tmp_ctx);
    return ret;
}

/*
 * Query format:
 * <uid><username[@domain]>
 */
errno_t sudosrv_parse_query(TALLOC_CTX *mem_ctx,
                            struct resp_ctx *rctx,
                            uint8_t *query_body,
                            size_t query_len,
                            uid_t *_uid,
                            char **_username,
                            struct sss_domain_info **_domain)
{
    TALLOC_CTX *tmp_ctx = NULL;
    struct sss_domain_info *domain = NULL;
    size_t offset = 0;
    size_t rawname_len = 0;
    char *rawname = NULL;
    char *domainname = NULL;
    char *username = NULL;
    uid_t uid;
    errno_t ret;

    tmp_ctx = talloc_new(NULL);
    if (tmp_ctx == NULL) {
        DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_new() failed\n"));
        return ENOMEM;
    }

    /* uid */

    if (query_len < sizeof(uid_t)) {
        DEBUG(SSSDBG_CRIT_FAILURE, ("Query is too small\n"));
        ret = EINVAL;
        goto done;
    }
    safealign_memcpy(&uid, query_body, sizeof(uid_t), &offset);

    /* username[@domain] */

    rawname = (char*)(query_body + offset);
    rawname_len = query_len - offset; /* strlen + zero */

    if (rawname[rawname_len - 1] != '\0') {
        DEBUG(SSSDBG_CRIT_FAILURE, ("Username is not zero terminated\n"));
        ret = EINVAL;
        goto done;
    }

    if (rawname_len < 2) { /* at least one character and zero */
        DEBUG(SSSDBG_CRIT_FAILURE, ("Query does not contain username\n"));
        ret = EINVAL;
        goto done;
    }

    if (!sss_utf8_check((uint8_t*)rawname, rawname_len - 1)) {
        DEBUG(SSSDBG_CRIT_FAILURE, ("Supplied data is not valid UTF-8 string\n"));
        ret = EINVAL;
        goto done;
    }

    /* parse username */

    ret = sss_parse_name_for_domains(tmp_ctx, rctx->domains,
                                     rctx->default_domain, rawname,
                                     &domainname, &username);
    if (ret != EOK) {
        DEBUG(SSSDBG_CRIT_FAILURE, ("Invalid name received [%s]\n", rawname));
        goto done;
    }

    if (domainname != NULL) {
        /* mem_ctx because it duplicates only subdomains not domains
         * so I cannot easily steal it */
        domain = responder_get_domain(mem_ctx, rctx, domainname);
        if (domain == NULL) {
            ret = ENOENT;
            goto done;
        }
    }

    *_uid = uid;
    *_username = talloc_steal(mem_ctx, username);
    *_domain = domain; /* do not steal on mem_ctx */

    ret = EOK;

done:
    talloc_free(tmp_ctx);
    return ret;
}