summaryrefslogtreecommitdiff
path: root/src/sss_client/sss_cli.h
blob: b0d7b82122dea216e9b356b432c5328b391de5b8 (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
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
/*
   SSSD

   Client Interface for NSS and PAM.

   Authors:
        Simo Sorce <ssorce@redhat.com>

   Copyright (C) Red Hat, Inc 2007

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU Lesser 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 Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef _SSSCLI_H
#define _SSSCLI_H

#include <nss.h>
#include <pwd.h>
#include <grp.h>
#include <string.h>
#include <stdint.h>
#include <limits.h>

#ifndef HAVE_ERRNO_T
#define HAVE_ERRNO_T
typedef int errno_t;
#endif


#ifndef EOK
#define EOK 0
#endif

#define SSS_NSS_PROTOCOL_VERSION 1
#define SSS_PAM_PROTOCOL_VERSION 3
#define SSS_SUDO_PROTOCOL_VERSION 1
#define SSS_AUTOFS_PROTOCOL_VERSION 1
#define SSS_SSH_PROTOCOL_VERSION 0
#define SSS_PAC_PROTOCOL_VERSION 1

#ifdef LOGIN_NAME_MAX
#define SSS_NAME_MAX LOGIN_NAME_MAX
#else
#define SSS_NAME_MAX 256
#endif

/**
 * @defgroup sss_cli_command SSS client commands
 * @{
 */

/** The allowed commands a SSS client can send to the SSSD */

enum sss_cli_command {
/* null */
    SSS_CLI_NULL           = 0x0000,

/* version */
    SSS_GET_VERSION    = 0x0001,

/* passwd */

    SSS_NSS_GETPWNAM       = 0x0011,
    SSS_NSS_GETPWUID       = 0x0012,
    SSS_NSS_SETPWENT       = 0x0013,
    SSS_NSS_GETPWENT       = 0x0014,
    SSS_NSS_ENDPWENT       = 0x0015,

/* group */

    SSS_NSS_GETGRNAM       = 0x0021,
    SSS_NSS_GETGRGID       = 0x0022,
    SSS_NSS_SETGRENT       = 0x0023,
    SSS_NSS_GETGRENT       = 0x0024,
    SSS_NSS_ENDGRENT       = 0x0025,
    SSS_NSS_INITGR         = 0x0026,

#if 0
/* aliases */

    SSS_NSS_GETALIASBYNAME = 0x0031,
    SSS_NSS_GETALIASBYPORT = 0x0032,
    SSS_NSS_SETALIASENT    = 0x0033,
    SSS_NSS_GETALIASENT    = 0x0034,
    SSS_NSS_ENDALIASENT    = 0x0035,

/* ethers */

    SSS_NSS_GETHOSTTON     = 0x0041,
    SSS_NSS_GETNTOHOST     = 0x0042,
    SSS_NSS_SETETHERENT    = 0x0043,
    SSS_NSS_GETETHERENT    = 0x0044,
    SSS_NSS_ENDETHERENT    = 0x0045,

/* hosts */

    SSS_NSS_GETHOSTBYNAME  = 0x0051,
    SSS_NSS_GETHOSTBYNAME2 = 0x0052,
    SSS_NSS_GETHOSTBYADDR  = 0x0053,
    SSS_NSS_SETHOSTENT     = 0x0054,
    SSS_NSS_GETHOSTENT     = 0x0055,
    SSS_NSS_ENDHOSTENT     = 0x0056,
#endif
/* netgroup */

    SSS_NSS_SETNETGRENT    = 0x0061,
    SSS_NSS_GETNETGRENT    = 0x0062,
    SSS_NSS_ENDNETGRENT    = 0x0063,
    /* SSS_NSS_INNETGR     = 0x0064, */
#if 0
/* networks */

    SSS_NSS_GETNETBYNAME   = 0x0071,
    SSS_NSS_GETNETBYADDR   = 0x0072,
    SSS_NSS_SETNETENT      = 0x0073,
    SSS_NSS_GETNETENT      = 0x0074,
    SSS_NSS_ENDNETENT      = 0x0075,

/* protocols */

    SSS_NSS_GETPROTOBYNAME = 0x0081,
    SSS_NSS_GETPROTOBYNUM  = 0x0082,
    SSS_NSS_SETPROTOENT    = 0x0083,
    SSS_NSS_GETPROTOENT    = 0x0084,
    SSS_NSS_ENDPROTOENT    = 0x0085,

/* rpc */

    SSS_NSS_GETRPCBYNAME   = 0x0091,
    SSS_NSS_GETRPCBYNUM    = 0x0092,
    SSS_NSS_SETRPCENT      = 0x0093,
    SSS_NSS_GETRPCENT      = 0x0094,
    SSS_NSS_ENDRPCENT      = 0x0095,
#endif

/* services */

    SSS_NSS_GETSERVBYNAME  = 0x00A1,
    SSS_NSS_GETSERVBYPORT  = 0x00A2,
    SSS_NSS_SETSERVENT     = 0x00A3,
    SSS_NSS_GETSERVENT     = 0x00A4,
    SSS_NSS_ENDSERVENT     = 0x00A5,

#if 0
/* shadow */

    SSS_NSS_GETSPNAM       = 0x00B1,
    SSS_NSS_GETSPUID       = 0x00B2,
    SSS_NSS_SETSPENT       = 0x00B3,
    SSS_NSS_GETSPENT       = 0x00B4,
    SSS_NSS_ENDSPENT       = 0x00B5,
#endif

/* SUDO */
    SSS_SUDO_GET_SUDORULES = 0x00C1,
    SSS_SUDO_GET_DEFAULTS  = 0x00C2,

/* autofs */
    SSS_AUTOFS_SETAUTOMNTENT    = 0x00D1,
    SSS_AUTOFS_GETAUTOMNTENT    = 0x00D2,
    SSS_AUTOFS_GETAUTOMNTBYNAME  = 0x00D3,
    SSS_AUTOFS_ENDAUTOMNTENT    = 0x00D4,

/* SSH */
    SSS_SSH_GET_USER_PUBKEYS = 0x00E1,
    SSS_SSH_GET_HOST_PUBKEYS = 0x00E2,

/* PAM related calls */
    SSS_PAM_AUTHENTICATE     = 0x00F1, /**< see pam_sm_authenticate(3) for
                                        * details.
                                        *
                                        * Additionally we allow sssd to send
                                        * the return code PAM_NEW_AUTHTOK_REQD
                                        * during authentication if the
                                        * authentication was successful but
                                        * the authentication token is expired.
                                        * To meet the standards of libpam we
                                        * return PAM_SUCCESS for
                                        * authentication and set a flag so
                                        * that the account management module
                                        * can return PAM_NEW_AUTHTOK_REQD if
                                        * sssd return success for account
                                        * management. We do this to reduce the
                                        * communication with external servers,
                                        * because there are cases, e.g.
                                        * Kerberos authentication, where the
                                        * information that the password is
                                        * expired is already available during
                                        * authentication. */
    SSS_PAM_SETCRED          = 0x00F2, /**< see pam_sm_setcred(3) for
                                        * details */
    SSS_PAM_ACCT_MGMT        = 0x00F3, /**< see pam_sm_acct_mgmt(3) for
                                        * details */
    SSS_PAM_OPEN_SESSION     = 0x00F4, /**< see pam_sm_open_session(3) for
                                        * details */
    SSS_PAM_CLOSE_SESSION    = 0x00F5, /**< see pam_sm_close_session(3) for
                                        *details */
    SSS_PAM_CHAUTHTOK        = 0x00F6, /**< second run of the password change
                                        * operation where the PAM_UPDATE_AUTHTOK
                                        * flag is set and the real change may
                                        * happen, see pam_sm_chauthtok(3) for
                                        * details */
    SSS_PAM_CHAUTHTOK_PRELIM = 0x00F7, /**< first run of the password change
                                        * operation where the PAM_PRELIM_CHECK
                                        * flag is set, see pam_sm_chauthtok(3)
                                        * for details */
    SSS_CMD_RENEW            = 0x00F8, /**< Renew a credential with a limited
                                        * lifetime, e.g. a Kerberos Ticket
                                        * Granting Ticket (TGT) */

/* PAC responder calls */
    SSS_PAC_ADD_PAC_USER     = 0x0101,

};

/**
 * @}
 */ /* end of group sss_cli_command */


/**
 * @defgroup sss_pam SSSD and PAM
 *
 * SSSD offers authentication and authorization via PAM
 *
 * The SSSD provides a PAM client modules pam_sss which can be called from the
 * PAM stack of the operation system. pam_sss will collect all the data about
 * the user from the PAM stack and sends them via a socket to the PAM
 * responder of the SSSD. The PAM responder selects the appropriate backend
 * and forwards the data via DBUS to the backend. The backend preforms the
 * requested operation and sends the result expressed by a PAM return value
 * and optional additional information back to the PAM responder. Finally the
 * PAM responder forwards the response back to the client.
 *
 * @{
 */

/**
 * @}
 */ /* end of group sss_pam */

/**
 * @defgroup sss_authtok_type Authentication Tokens
 * @ingroup sss_pam
 *
 * To indicate to the components of the SSSD how to handle the authentication
 * token the client sends the type of the authentication token to the SSSD.
 *
 * @{
 */

/** The different types of authentication tokens */

enum sss_authtok_type {
    SSS_AUTHTOK_TYPE_EMPTY    =  0x0000, /**< No authentication token
                                          * available */
    SSS_AUTHTOK_TYPE_PASSWORD =  0x0001, /**< Authentication token is a
                                          * password, it may or may no contain
                                          * a trailing \\0 */
    SSS_AUTHTOK_TYPE_CCFILE =    0x0002, /**< Authentication token is a path to
                                          * a Kerberos credential cache file,
                                          * it may or may no contain
                                          * a trailing \\0 */
};

/**
 * @}
 */ /* end of group sss_authtok_type */

#define SSS_START_OF_PAM_REQUEST 0x4d415049
#define SSS_END_OF_PAM_REQUEST 0x4950414d

enum pam_item_type {
    SSS_PAM_ITEM_EMPTY = 0x0000,
    SSS_PAM_ITEM_USER,
    SSS_PAM_ITEM_SERVICE,
    SSS_PAM_ITEM_TTY,
    SSS_PAM_ITEM_RUSER,
    SSS_PAM_ITEM_RHOST,
    SSS_PAM_ITEM_AUTHTOK,
    SSS_PAM_ITEM_NEWAUTHTOK,
    SSS_PAM_ITEM_CLI_LOCALE,
    SSS_PAM_ITEM_CLI_PID,
};

#define SSS_NSS_MAX_ENTRIES 256
#define SSS_NSS_HEADER_SIZE (sizeof(uint32_t) * 4)
struct sss_cli_req_data {
    size_t len;
    const void *data;
};

/* this is in milliseconds, wait up to 300 seconds */
#define SSS_CLI_SOCKET_TIMEOUT 300000

enum sss_status {
    SSS_STATUS_TRYAGAIN,
    SSS_STATUS_UNAVAIL,
    SSS_STATUS_SUCCESS
};

/**
 * @defgroup sss_pam_cli Responses to the PAM client
 * @ingroup sss_pam
 * @{
 */

/**
 * @defgroup response_type Messages from the server
 * @ingroup sss_pam_cli
 *
 * SSSD can send different kind of information back to the client.
 * A response from the SSSD can contain 0 or more messages. Each message
 * contains a type tag and the size of the message data, both are unsigned
 * 32-bit integer values, followed be the message specific data.
 *
 * If the message is generated by a backend it is send back to the PAM
 * responder via a D-BUS message in an array of D-BUS structs. The struct
 * consists of a DBUS_TYPE_UINT32 for the tag and a DBUS_TYPE_ARRAY to hold
 * the message.
 *
 * Examples:
 *  - #SSS_PAM_ENV_ITEM,
 *    <pre>
 *    ------------------------------------
 *    | uint32_t | uint32_t | uint8_t[4] |
 *    | 0x03     | 0x04     | a=b\\0      |
 *    ------------------------------------
 *    </pre>
 * @{
 */

/** Types of different messages */

enum response_type {
    SSS_PAM_SYSTEM_INFO = 0x01, /**< Message for the system log.
                                 * @param String, zero terminated. */
    SSS_PAM_DOMAIN_NAME, /**< Name of the domain the user belongs too.
                          * This messages is generated by the PAM responder.
                          * @param String, zero terminated, with the domain
                          * name. */
    SSS_PAM_ENV_ITEM,    /**< Set and environment variable with pam_putenv(3).
                          * @param String, zero terminated, of the form
                          * name=value. See pam_putenv(3) for details. */
    SSS_ENV_ITEM,        /**< Set and environment variable with putenv(3).
                          * @param String, zero terminated, of the form
                          * name=value. See putenv(3) for details. */
    SSS_ALL_ENV_ITEM,    /**< Set and environment variable with putenv(3) and
                          * pam_putenv(3).
                          * @param String, zero terminated, of the form
                          * name=value. See putenv(3) and pam_putenv(3) for
                          * details. */
    SSS_PAM_USER_INFO,   /**< A message which should be displayed to the user.
                          * @param User info message, see #user_info_type
                          * for details. */
    SSS_PAM_TEXT_MSG,    /**< A plain text message which should be displayed to
                          * the user.This should only be used in the case where
                          * it is not possile to use SSS_PAM_USER_INFO.
                          * @param A zero terminated string. */
    SSS_OTP,             /**< Indicates that the autotok was a OTP, so don't
                          * cache it. There is no message.
                          * @param None. */
};

/**
 * @defgroup user_info_type User info messages
 * @ingroup response_type
 *
 * To achieve a consistent user experience and to facilitate
 * internationalization all messages show to the user are generate by the PAM
 * client and not by the SSSD server components. To indicate what message the
 * client should display to the user SSSD can send a #SSS_PAM_USER_INFO message
 * where the data part contains one of the following tags as an unsigned
 * 32-bit integer value and optional data.
 *
 * Examples:
 *  - #SSS_PAM_USER_INFO_OFFLINE_CHPASS
 *    <pre>
 *    ----------------------------------
 *    | uint32_t | uint32_t | uint32_t |
 *    | 0x06     | 0x01     | 0x03     |
 *    ----------------------------------
 *    </pre>
 *  - #SSS_PAM_USER_INFO_CHPASS_ERROR
 *    <pre>
 *    ----------------------------------------------------------
 *    | uint32_t | uint32_t | uint32_t | uint32_t | uint8_t[3] |
 *    | 0x06     | 0x05     | 0x04     | 0x03     | abc        |
 *    ----------------------------------------------------------
 *    </pre>
 * @{
 */

/** Different types of user messages */

enum user_info_type {
    SSS_PAM_USER_INFO_OFFLINE_AUTH = 0x01, /**< Inform the user that the
                                            * authentication happened offline.
                                            * This message is generated by the
                                            * PAM responder.
                                            * @param Time when the cached
                                            * password will expire in seconds
                                            * since the UNIX Epoch as returned
                                            * by time(2) as int64_t. A value
                                            * of zero indicates that the
                                            * cached password will never
                                            * expire. */
    SSS_PAM_USER_INFO_OFFLINE_AUTH_DELAYED, /**< Tell the user how low a new
                                             * authentication is delayed. This
                                             * message is generated by the PAM
                                             * responder.
                                             * @param Time when an
                                             * authentication is allowed again
                                             * in seconds since the UNIX Epoch
                                             * as returned by time(2) as
                                             * int64_t. */
    SSS_PAM_USER_INFO_OFFLINE_CHPASS, /**< * Tell the user that it is not
                                       * possible to change the password while
                                       * the system is offline. This message
                                       * is generated by the PAM responder. */
    SSS_PAM_USER_INFO_CHPASS_ERROR, /**< Tell the user that a password change
                                     * failed and optionally give a reason.
                                     * @param Size of the message as unsigned
                                     * 32-bit integer value. A value of 0
                                     * indicates that no message is following.
                                     * @param String with the specified
                                     * length. */
    SSS_PAM_USER_INFO_GRACE_LOGIN, /**< Warn the user that the password is
                                    * expired and inform about the remaining
                                    * number of grace logins.
                                    * @param The number of remaining grace
                                    * logins as uint32_t */
    SSS_PAM_USER_INFO_EXPIRE_WARN /**< Warn the user that the password will
                                   * expire soon.
                                   * @param Number of seconds before the user's
                                   * password will expire. */
};
/**
 * @}
 */ /* end of group user_info_type */

/**
 * @}
 */ /* end of group response_type */

/**
 * @}
 */ /* end of group sss_pam_cli */

enum sss_netgr_rep_type {
    SSS_NETGR_REP_TRIPLE = 1,
    SSS_NETGR_REP_GROUP
};

enum sss_cli_error_codes {
    ESSS_SSS_CLI_ERROR_START = 0x1000,
    ESSS_BAD_PRIV_SOCKET,
    ESSS_BAD_PUB_SOCKET,
    ESSS_BAD_CRED_MSG,
    ESSS_SERVER_NOT_TRUSTED,

    ESS_SSS_CLI_ERROR_MAX
};

const char *ssscli_err2string(int err);

enum nss_status sss_nss_make_request(enum sss_cli_command cmd,
                                     struct sss_cli_req_data *rd,
                                     uint8_t **repbuf, size_t *replen,
                                     int *errnop);

int sss_pam_make_request(enum sss_cli_command cmd,
                         struct sss_cli_req_data *rd,
                         uint8_t **repbuf, size_t *replen,
                         int *errnop);
void sss_pam_close_fd(void);

int sss_pac_make_request(enum sss_cli_command cmd,
                         struct sss_cli_req_data *rd,
                         uint8_t **repbuf, size_t *replen,
                         int *errnop);

int sss_sudo_make_request(enum sss_cli_command cmd,
                          struct sss_cli_req_data *rd,
                          uint8_t **repbuf, size_t *replen,
                          int *errnop);

int sss_autofs_make_request(enum sss_cli_command cmd,
                            struct sss_cli_req_data *rd,
                            uint8_t **repbuf, size_t *replen,
                            int *errnop);

int sss_ssh_make_request(enum sss_cli_command cmd,
                         struct sss_cli_req_data *rd,
                         uint8_t **repbuf, size_t *replen,
                         int *errnop);

#ifndef SAFEALIGN_COPY_UINT32
static inline void
safealign_memcpy(void *dest, const void *src, size_t n, size_t *counter)
{
    memcpy(dest, src, n);
    if (counter) {
        *counter += n;
    }
}

#define SAFEALIGN_SET_VALUE(dest, value, type, pctr) do { \
    type CV_MACRO_val = (type)(value); \
    safealign_memcpy(dest, &CV_MACRO_val, sizeof(type), pctr); \
} while(0)

#ifndef SAFEALIGN_SET_UINT32
#define SAFEALIGN_SET_UINT32(dest, value, pctr) \
    SAFEALIGN_SET_VALUE(dest, value, uint32_t, pctr)
#endif

#define SAFEALIGN_COPY_UINT32(dest, src, pctr) \
    safealign_memcpy(dest, src, sizeof(uint32_t), pctr)
#endif

#ifndef SAFEALIGN_SET_UINT16
#define SAFEALIGN_SET_UINT16(dest, value, pctr) \
    SAFEALIGN_SET_VALUE(dest, value, uint16_t, pctr)
#endif

#ifndef SAFEALIGN_COPY_UINT16
#define SAFEALIGN_COPY_UINT16(dest, src, pctr) \
    safealign_memcpy(dest, src, sizeof(uint16_t), pctr)
#endif

#if 0

/* GETSPNAM Request:
 *
 * 0-X: string with name
 *
 * Replies:
 *
 * 0-3: 32bit unsigned number of results
 * 4-7: 32bit unsigned (reserved/padding)
 * For each result:
 *  0-7: 64bit unsigned with Date of last change
 *  8-15: 64bit unsigned with Min #days between changes
 *  16-23: 64bit unsigned with Max #days between changes
 *  24-31: 64bit unsigned with #days before pwd expires
 *  32-39: 64bit unsigned with #days after pwd expires until account is disabled
 *  40-47: 64bit unsigned with expiration date in days since 1970-01-01
 *  48-55: 64bit unsigned (flags/reserved)
 *  56-X: sequence of 2, 0 terminated, strings (name, pwd) 64bit padded
 */
#endif

/* Return strlen(str) or maxlen, whichever is shorter
 * Returns EINVAL if str is NULL, EFBIG if str is longer than maxlen
 * _len will return the result
 */
errno_t sss_strnlen(const char *str, size_t maxlen, size_t *len);

void sss_nss_lock(void);
void sss_nss_unlock(void);
void sss_pam_lock(void);
void sss_pam_unlock(void);

errno_t sss_readrep_copy_string(const char *in,
                                size_t *offset,
                                size_t *slen,
                                size_t *dlen,
                                char **out,
                                size_t *size);

#endif /* _SSSCLI_H */