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- Committer: Teddy Hogeborn
- Date: 2015-03-10 18:52:09 UTC
- Revision ID: teddy@recompile.se-20150310185209-lxuovbu09zwyk9bx
Automatically determine the number of DH bits in the TLS handshake.
Instead of using a default value of 1024, check the OpenPGP key and
determine an appropriate number of DH bits to use, (using GnuTLS
functions made for this). Document this new default behavior.
* plugins.d/mandos-client.c (safe_string): New function.
(init_gnutls_global): If not specified, determine the number of DH
bits to use, based on the OpenPGP key.
* plugins.d/mandos-client.xml (OPTIONS): Document this new default of
the --dh-bits option.
Thanks to Andreas Fischer <af@bantuX.org> for reporting this issue.
Instead of using a default value of 1024, check the OpenPGP key and
determine an appropriate number of DH bits to use, (using GnuTLS
functions made for this). Document this new default behavior.
* plugins.d/mandos-client.c (safe_string): New function.
(init_gnutls_global): If not specified, determine the number of DH
bits to use, based on the OpenPGP key.
* plugins.d/mandos-client.xml (OPTIONS): Document this new default of
the --dh-bits option.
Thanks to Andreas Fischer <af@bantuX.org> for reporting this issue.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
20
21
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
O_CLOEXEC, pipe2() */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
37
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
38
FD_SET(), FD_ISSET(), FD_CLR */
39
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
40
WEXITSTATUS(), WTERMSIG(),
41
WCOREDUMP() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
43
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
57
#include <errno.h> /* errno */
56
58
#include <argp.h> /* struct argp_option, struct
57
59
argp_state, struct argp,
61
63
#include <signal.h> /* struct sigaction, sigemptyset(),
62
64
sigaddset(), sigaction(),
63
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
68
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
69
78
#define PDIR "/lib/mandos/plugins.d"
70
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
80
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
83
77
84
typedef struct plugin{
78
85
char *name; /* can be NULL or any plugin name */
81
88
char **environ;
82
89
int envc;
83
90
bool disabled;
84
91
85
92
/* Variables used for running processes*/
86
93
pid_t pid;
87
94
int fd;
89
96
size_t buffer_size;
90
97
size_t buffer_length;
91
98
bool eof;
92
volatile bool completed;
93
volatile int status;
99
volatile sig_atomic_t completed;
100
int status;
94
101
struct plugin *next;
95
102
} plugin;
96
103
97
104
static plugin *plugin_list = NULL;
98
105
99
/* Gets a existing plugin based on name,
106
/* Gets an existing plugin based on name,
100
107
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
101
109
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
110
/* Check for existing plugin with that name */
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
if((p->name == name)
113
or (p->name and name and (strcmp(p->name, name) == 0))){
106
114
return p;
107
115
}
108
116
}
109
117
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
118
plugin *new_plugin = NULL;
119
do {
120
new_plugin = malloc(sizeof(plugin));
121
} while(new_plugin == NULL and errno == EINTR);
122
if(new_plugin == NULL){
112
123
return NULL;
113
124
}
114
125
char *copy_name = NULL;
115
126
if(name != NULL){
116
copy_name = strdup(name);
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
117
130
if(copy_name == NULL){
131
int e = errno;
132
free(new_plugin);
133
errno = e;
118
134
return NULL;
119
135
}
120
136
}
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
137
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
142
143
do {
144
new_plugin->argv = malloc(sizeof(char *) * 2);
145
} while(new_plugin->argv == NULL and errno == EINTR);
146
if(new_plugin->argv == NULL){
147
int e = errno;
129
148
free(copy_name);
130
149
free(new_plugin);
150
errno = e;
131
151
return NULL;
132
152
}
133
153
new_plugin->argv[0] = copy_name;
134
154
new_plugin->argv[1] = NULL;
135
155
136
new_plugin->environ = malloc(sizeof(char *));
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
137
159
if(new_plugin->environ == NULL){
160
int e = errno;
138
161
free(copy_name);
139
162
free(new_plugin->argv);
140
163
free(new_plugin);
164
errno = e;
141
165
return NULL;
142
166
}
143
167
new_plugin->environ[0] = NULL;
148
172
}
149
173
150
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
151
176
static bool add_to_char_array(const char *new, char ***array,
152
177
int *len){
153
178
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
179
char **new_array = NULL;
180
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
156
184
/* Malloc check */
157
if(*array == NULL){
185
if(new_array == NULL){
158
186
return false;
159
187
}
188
*array = new_array;
160
189
/* Make a copy of the new string */
161
char *copy = strdup(new);
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
162
194
if(copy == NULL){
163
195
return false;
164
196
}
171
203
}
172
204
173
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
174
207
static bool add_argument(plugin *p, const char *arg){
175
208
if(p == NULL){
176
209
return false;
179
212
}
180
213
181
214
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
182
216
static bool add_environment(plugin *p, const char *def, bool replace){
183
217
if(p == NULL){
184
218
return false;
186
220
/* namelen = length of name of environment variable */
187
221
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
222
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
191
225
/* It already exists */
192
226
if(replace){
193
char *new = realloc(*e, strlen(def));
194
if(new == NULL){
227
char *new_envdef;
228
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
195
232
return false;
196
233
}
197
*e = new;
198
strcpy(*e, def);
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
199
236
}
200
237
return true;
201
238
}
203
240
return add_to_char_array(def, &(p->environ), &(p->envc));
204
241
}
205
242
243
#ifndef O_CLOEXEC
206
244
/*
207
245
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
246
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
248
*/
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
249
__attribute__((warn_unused_result))
250
static int set_cloexec_flag(int fd){
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
252
/* If reading the flags failed, return error indication now. */
215
253
if(ret < 0){
216
254
return ret;
217
255
}
218
256
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
ret | FD_CLOEXEC));
220
259
}
260
#endif /* not O_CLOEXEC */
221
261
222
262
223
263
/* Mark processes as completed when they exit, and save their exit
224
264
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
265
static void handle_sigchld(__attribute__((unused)) int sig){
266
int old_errno = errno;
226
267
while(true){
227
268
plugin *proc = plugin_list;
228
269
int status;
232
273
break;
233
274
}
234
275
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
276
if(errno == ECHILD){
277
/* No child processes */
278
break;
237
279
}
238
/* No child processes */
239
break;
280
error(0, errno, "waitpid");
240
281
}
241
282
242
283
/* A child exited, find it in process_list */
243
284
while(proc != NULL and proc->pid != pid){
244
285
proc = proc->next;
248
289
continue;
249
290
}
250
291
proc->status = status;
251
proc->completed = true;
292
proc->completed = 1;
252
293
}
294
errno = old_errno;
253
295
}
254
296
255
297
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
298
__attribute__((nonnull, warn_unused_result))
299
static bool print_out_password(const char *buffer, size_t length){
257
300
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
261
301
for(size_t written = 0; written < length; written += (size_t)ret){
262
302
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
303
length - written));
269
309
}
270
310
271
311
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
272
313
static void free_plugin(plugin *plugin_node){
273
314
274
315
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
280
321
}
281
322
free(plugin_node->environ);
282
323
free(plugin_node->buffer);
283
324
284
325
/* Removes the plugin from the singly-linked list */
285
326
if(plugin_node == plugin_list){
286
327
/* First one - simple */
308
349
char *plugindir = NULL;
309
350
char *argfile = NULL;
310
351
FILE *conffp;
311
size_t d_name_len;
312
DIR *dir = NULL;
313
struct dirent *dirst;
352
struct dirent **direntries = NULL;
314
353
struct stat st;
315
354
fd_set rfds_all;
316
355
int ret, maxfd = 0;
356
ssize_t sret;
317
357
uid_t uid = 65534;
318
358
gid_t gid = 65534;
319
359
bool debug = false;
323
363
.sa_flags = SA_NOCLDSTOP };
324
364
char **custom_argv = NULL;
325
365
int custom_argc = 0;
366
int dir_fd = -1;
326
367
327
368
/* Establish a signal handler */
328
369
sigemptyset(&sigchld_action.sa_mask);
329
370
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
330
371
if(ret == -1){
331
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
333
374
goto fallback;
334
375
}
335
376
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
336
377
if(ret == -1){
337
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
339
380
goto fallback;
340
381
}
341
382
373
414
.doc = "Group ID the plugins will run as", .group = 3 },
374
415
{ .name = "debug", .key = 132,
375
416
.doc = "Debug mode", .group = 4 },
417
/*
418
* These reproduce what we would get without ARGP_NO_HELP
419
*/
420
{ .name = "help", .key = '?',
421
.doc = "Give this help list", .group = -1 },
422
{ .name = "usage", .key = -3,
423
.doc = "Give a short usage message", .group = -1 },
424
{ .name = "version", .key = 'V',
425
.doc = "Print program version", .group = -1 },
376
426
{ .name = NULL }
377
427
};
378
428
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
381
switch (key) {
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
431
errno = 0;
432
switch(key){
433
char *tmp;
434
intmax_t tmp_id;
382
435
case 'g': /* --global-options */
383
if (arg != NULL){
384
char *p;
385
while((p = strsep(&arg, ",")) != NULL){
386
if(p[0] == '\0'){
387
continue;
388
}
389
if(not add_argument(getplugin(NULL), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
436
{
437
char *plugin_option;
438
while((plugin_option = strsep(&arg, ",")) != NULL){
439
if(not add_argument(getplugin(NULL), plugin_option)){
440
break;
392
441
}
393
442
}
443
errno = 0;
394
444
}
395
445
break;
396
446
case 'G': /* --global-env */
397
if(arg == NULL){
398
break;
399
}
400
{
401
char *envdef = strdup(arg);
402
if(envdef == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), envdef, true)){
406
perror("add_environment");
407
}
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
408
449
}
409
450
break;
410
451
case 'o': /* --options-for */
411
if (arg != NULL){
412
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0'){
414
break;
415
}
416
char *opt = strsep(&arg, ":");
417
if(opt[0] == '\0'){
418
break;
419
}
420
if(opt != NULL){
421
char *p;
422
while((p = strsep(&opt, ",")) != NULL){
423
if(p[0] == '\0'){
424
continue;
425
}
426
if(not add_argument(getplugin(p_name), p)){
427
perror("add_argument");
428
return ARGP_ERR_UNKNOWN;
429
}
452
{
453
char *option_list = strchr(arg, ':');
454
if(option_list == NULL){
455
argp_error(state, "No colon in \"%s\"", arg);
456
errno = EINVAL;
457
break;
458
}
459
*option_list = '\0';
460
option_list++;
461
if(arg[0] == '\0'){
462
argp_error(state, "Empty plugin name");
463
errno = EINVAL;
464
break;
465
}
466
char *option;
467
while((option = strsep(&option_list, ",")) != NULL){
468
if(not add_argument(getplugin(arg), option)){
469
break;
430
470
}
431
471
}
472
errno = 0;
432
473
}
433
474
break;
434
475
case 'E': /* --env-for */
435
if(arg == NULL){
436
break;
437
}
438
476
{
439
477
char *envdef = strchr(arg, ':');
440
478
if(envdef == NULL){
441
break;
442
}
443
char *p_name = strndup(arg, (size_t) (envdef-arg));
444
if(p_name == NULL){
445
break;
446
}
479
argp_error(state, "No colon in \"%s\"", arg);
480
errno = EINVAL;
481
break;
482
}
483
*envdef = '\0';
447
484
envdef++;
448
if(not add_environment(getplugin(p_name), envdef, true)){
449
perror("add_environment");
485
if(arg[0] == '\0'){
486
argp_error(state, "Empty plugin name");
487
errno = EINVAL;
488
break;
489
}
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
450
492
}
451
493
}
452
494
break;
453
495
case 'd': /* --disable */
454
if (arg != NULL){
496
{
455
497
plugin *p = getplugin(arg);
456
if(p == NULL){
457
return ARGP_ERR_UNKNOWN;
498
if(p != NULL){
499
p->disabled = true;
500
errno = 0;
458
501
}
459
p->disabled = true;
460
502
}
461
503
break;
462
504
case 'e': /* --enable */
463
if (arg != NULL){
505
{
464
506
plugin *p = getplugin(arg);
465
if(p == NULL){
466
return ARGP_ERR_UNKNOWN;
507
if(p != NULL){
508
p->disabled = false;
509
errno = 0;
467
510
}
468
p->disabled = false;
469
511
}
470
512
break;
471
513
case 128: /* --plugin-dir */
514
free(plugindir);
472
515
plugindir = strdup(arg);
473
if(plugindir == NULL){
474
perror("strdup");
475
}
516
if(plugindir != NULL){
517
errno = 0;
518
}
476
519
break;
477
520
case 129: /* --config-file */
478
521
/* This is already done by parse_opt_config_file() */
479
522
break;
480
523
case 130: /* --userid */
481
uid = (uid_t)strtol(arg, NULL, 10);
524
tmp_id = strtoimax(arg, &tmp, 10);
525
if(errno != 0 or tmp == arg or *tmp != '\0'
526
or tmp_id != (uid_t)tmp_id){
527
argp_error(state, "Bad user ID number: \"%s\", using %"
528
PRIdMAX, arg, (intmax_t)uid);
529
break;
530
}
531
uid = (uid_t)tmp_id;
532
errno = 0;
482
533
break;
483
534
case 131: /* --groupid */
484
gid = (gid_t)strtol(arg, NULL, 10);
535
tmp_id = strtoimax(arg, &tmp, 10);
536
if(errno != 0 or tmp == arg or *tmp != '\0'
537
or tmp_id != (gid_t)tmp_id){
538
argp_error(state, "Bad group ID number: \"%s\", using %"
539
PRIdMAX, arg, (intmax_t)gid);
540
break;
541
}
542
gid = (gid_t)tmp_id;
543
errno = 0;
485
544
break;
486
545
case 132: /* --debug */
487
546
debug = true;
488
547
break;
548
/*
549
* These reproduce what we would get without ARGP_NO_HELP
550
*/
551
case '?': /* --help */
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
554
case -3: /* --usage */
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
556
argp_state_help(state, state->out_stream,
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
558
case 'V': /* --version */
559
fprintf(state->out_stream, "%s\n", argp_program_version);
560
exit(EXIT_SUCCESS);
561
break;
562
/*
563
* When adding more options before this line, remember to also add a
564
* "case" to the "parse_opt_config_file" function below.
565
*/
489
566
case ARGP_KEY_ARG:
490
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
491
break;
492
case ARGP_KEY_END:
493
break;
567
/* Cryptsetup always passes an argument, which is an empty
568
string if "none" was specified in /etc/crypttab. So if
569
argument was empty, we ignore it silently. */
570
if(arg[0] == '\0'){
571
break;
572
}
494
573
default:
495
574
return ARGP_ERR_UNKNOWN;
496
575
}
497
return 0;
576
return errno; /* Set to 0 at start */
498
577
}
499
578
500
579
/* This option parser is the same as parse_opt() above, except it
501
580
ignores everything but the --config-file option. */
502
error_t parse_opt_config_file (int key, char *arg,
503
__attribute__((unused))
504
struct argp_state *state) {
505
switch (key) {
581
error_t parse_opt_config_file(int key, char *arg,
582
__attribute__((unused))
583
struct argp_state *state){
584
errno = 0;
585
switch(key){
506
586
case 'g': /* --global-options */
507
587
case 'G': /* --global-env */
508
588
case 'o': /* --options-for */
512
592
case 128: /* --plugin-dir */
513
593
break;
514
594
case 129: /* --config-file */
595
free(argfile);
515
596
argfile = strdup(arg);
516
if(argfile == NULL){
517
perror("strdup");
597
if(argfile != NULL){
598
errno = 0;
518
599
}
519
break;
600
break;
520
601
case 130: /* --userid */
521
602
case 131: /* --groupid */
522
603
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
523
607
case ARGP_KEY_ARG:
524
case ARGP_KEY_END:
525
608
break;
526
609
default:
527
610
return ARGP_ERR_UNKNOWN;
528
611
}
529
return 0;
612
return errno;
530
613
}
531
614
532
615
struct argp argp = { .options = options,
534
617
.args_doc = "",
535
618
.doc = "Mandos plugin runner -- Run plugins" };
536
619
537
/* Parse using the parse_opt_config_file in order to get the custom
620
/* Parse using parse_opt_config_file() in order to get the custom
538
621
config file location, if any. */
539
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
540
if (ret == ARGP_ERR_UNKNOWN){
541
fprintf(stderr, "Unknown error while parsing arguments\n");
542
exitstatus = EXIT_FAILURE;
622
ret = argp_parse(&argp, argc, argv,
623
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
624
NULL, NULL);
625
switch(ret){
626
case 0:
627
break;
628
case ENOMEM:
629
default:
630
errno = ret;
631
error(0, errno, "argp_parse");
632
exitstatus = EX_OSERR;
633
goto fallback;
634
case EINVAL:
635
exitstatus = EX_USAGE;
543
636
goto fallback;
544
637
}
545
638
547
640
argp.parser = parse_opt;
548
641
549
642
/* Open the configfile if available */
550
if (argfile == NULL){
643
if(argfile == NULL){
551
644
conffp = fopen(AFILE, "r");
552
645
} else {
553
646
conffp = fopen(argfile, "r");
554
}
647
}
555
648
if(conffp != NULL){
556
649
char *org_line = NULL;
557
650
char *p, *arg, *new_arg, *line;
558
651
size_t size = 0;
559
ssize_t sret;
560
652
const char whitespace_delims[] = " \r\t\f\v\n";
561
653
const char comment_delim[] = "#";
562
654
563
655
custom_argc = 1;
564
656
custom_argv = malloc(sizeof(char*) * 2);
565
657
if(custom_argv == NULL){
566
perror("malloc");
567
exitstatus = EXIT_FAILURE;
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
568
660
goto fallback;
569
661
}
570
662
custom_argv[0] = argv[0];
571
663
custom_argv[1] = NULL;
572
664
573
665
/* for each line in the config file, strip whitespace and ignore
574
666
commented text */
575
667
while(true){
577
669
if(sret == -1){
578
670
break;
579
671
}
580
672
581
673
line = org_line;
582
674
arg = strsep(&line, comment_delim);
583
675
while((p = strsep(&arg, whitespace_delims)) != NULL){
586
678
}
587
679
new_arg = strdup(p);
588
680
if(new_arg == NULL){
589
perror("strdup");
590
exitstatus = EXIT_FAILURE;
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
591
683
free(org_line);
592
684
goto fallback;
593
685
}
594
686
595
687
custom_argc += 1;
596
custom_argv = realloc(custom_argv, sizeof(char *)
597
* ((unsigned int) custom_argc + 1));
598
if(custom_argv == NULL){
599
perror("realloc");
600
exitstatus = EXIT_FAILURE;
601
free(org_line);
602
goto fallback;
688
{
689
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
695
free(new_arg);
696
free(org_line);
697
goto fallback;
698
} else {
699
custom_argv = new_argv;
700
}
603
701
}
604
702
custom_argv[custom_argc-1] = new_arg;
605
custom_argv[custom_argc] = NULL;
703
custom_argv[custom_argc] = NULL;
606
704
}
607
705
}
706
do {
707
ret = fclose(conffp);
708
} while(ret == EOF and errno == EINTR);
709
if(ret == EOF){
710
error(0, errno, "fclose");
711
exitstatus = EX_IOERR;
712
goto fallback;
713
}
608
714
free(org_line);
609
715
} else {
610
716
/* Check for harmful errors and go to fallback. Other errors might
611
717
not affect opening plugins */
612
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
613
perror("fopen");
614
exitstatus = EXIT_FAILURE;
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
615
721
goto fallback;
616
722
}
617
723
}
618
/* If there was any arguments from configuration file,
619
pass them to parser as command arguments */
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
620
726
if(custom_argv != NULL){
621
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
622
0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
727
ret = argp_parse(&argp, custom_argc, custom_argv,
728
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
729
NULL, NULL);
730
switch(ret){
731
case 0:
732
break;
733
case ENOMEM:
734
default:
735
errno = ret;
736
error(0, errno, "argp_parse");
737
exitstatus = EX_OSERR;
738
goto fallback;
739
case EINVAL:
740
exitstatus = EX_CONFIG;
626
741
goto fallback;
627
742
}
628
743
}
629
744
630
745
/* Parse actual command line arguments, to let them override the
631
746
config file */
632
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
633
if (ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
747
ret = argp_parse(&argp, argc, argv,
748
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
749
NULL, NULL);
750
switch(ret){
751
case 0:
752
break;
753
case ENOMEM:
754
default:
755
errno = ret;
756
error(0, errno, "argp_parse");
757
exitstatus = EX_OSERR;
758
goto fallback;
759
case EINVAL:
760
exitstatus = EX_USAGE;
636
761
goto fallback;
637
762
}
638
763
643
768
for(char **a = p->argv; *a != NULL; a++){
644
769
fprintf(stderr, "\tArg: %s\n", *a);
645
770
}
646
fprintf(stderr, "...and %u environment variables\n", p->envc);
771
fprintf(stderr, "...and %d environment variables\n", p->envc);
647
772
for(char **a = p->environ; *a != NULL; a++){
648
773
fprintf(stderr, "\t%s\n", *a);
649
774
}
650
775
}
651
776
}
652
777
653
/* Strip permissions down to nobody */
778
if(getuid() == 0){
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
786
} else {
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
788
if(ret == -1){
789
error(0, errno, "fstat");
790
} else {
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
793
if(ret == -1){
794
error(0, errno, "fchown");
795
}
796
}
797
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
799
}
800
}
801
802
/* Lower permissions */
803
ret = setgid(gid);
804
if(ret == -1){
805
error(0, errno, "setgid");
806
}
654
807
ret = setuid(uid);
655
if (ret == -1){
656
perror("setuid");
657
}
658
setgid(gid);
659
if (ret == -1){
660
perror("setgid");
661
}
662
663
if (plugindir == NULL){
664
dir = opendir(PDIR);
665
} else {
666
dir = opendir(plugindir);
667
}
668
669
if(dir == NULL){
670
perror("Could not open plugin dir");
671
exitstatus = EXIT_FAILURE;
672
goto fallback;
673
}
674
675
/* Set the FD_CLOEXEC flag on the directory, if possible */
808
if(ret == -1){
809
error(0, errno, "setuid");
810
}
811
812
/* Open plugin directory with close_on_exec flag */
676
813
{
677
int dir_fd = dirfd(dir);
678
if(dir_fd >= 0){
679
ret = set_cloexec_flag(dir_fd);
680
if(ret < 0){
681
perror("set_cloexec_flag");
682
exitstatus = EXIT_FAILURE;
683
goto fallback;
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
815
#ifdef O_CLOEXEC
816
O_CLOEXEC
817
#else /* not O_CLOEXEC */
818
0
819
#endif /* not O_CLOEXEC */
820
);
821
if(dir_fd == -1){
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
824
goto fallback;
825
}
826
827
#ifndef O_CLOEXEC
828
/* Set the FD_CLOEXEC flag on the directory */
829
ret = set_cloexec_flag(dir_fd);
830
if(ret < 0){
831
error(0, errno, "set_cloexec_flag");
832
exitstatus = EX_OSERR;
833
goto fallback;
834
}
835
#endif /* O_CLOEXEC */
836
}
837
838
int good_name(const struct dirent * const dirent){
839
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
840
"*.dpkg-old", "*.dpkg-bak",
841
"*.dpkg-divert", NULL };
842
#ifdef __GNUC__
843
#pragma GCC diagnostic push
844
#pragma GCC diagnostic ignored "-Wcast-qual"
845
#endif
846
for(const char **pat = (const char **)patterns;
847
*pat != NULL; pat++){
848
#ifdef __GNUC__
849
#pragma GCC diagnostic pop
850
#endif
851
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
852
!= FNM_NOMATCH){
853
if(debug){
854
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
855
" matching pattern %s\n", dirent->d_name, *pat);
856
}
857
return 0;
684
858
}
685
859
}
860
return 1;
861
}
862
863
#ifdef __GLIBC__
864
#if __GLIBC_PREREQ(2, 15)
865
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
866
alphasort);
867
#else /* not __GLIBC_PREREQ(2, 15) */
868
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
869
&direntries, good_name, alphasort);
870
#endif /* not __GLIBC_PREREQ(2, 15) */
871
#else /* not __GLIBC__ */
872
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
873
&direntries, good_name, alphasort);
874
#endif /* not __GLIBC__ */
875
if(numplugins == -1){
876
error(0, errno, "Could not scan plugin dir");
877
direntries = NULL;
878
exitstatus = EX_OSERR;
879
goto fallback;
686
880
}
687
881
688
882
FD_ZERO(&rfds_all);
689
883
690
884
/* Read and execute any executable in the plugin directory*/
691
while(true){
692
dirst = readdir(dir);
693
694
/* All directory entries have been processed */
695
if(dirst == NULL){
696
if (errno == EBADF){
697
perror("readdir");
698
exitstatus = EXIT_FAILURE;
699
goto fallback;
700
}
701
break;
702
}
703
704
d_name_len = strlen(dirst->d_name);
705
706
/* Ignore dotfiles, backup files and other junk */
707
{
708
bool bad_name = false;
709
710
const char const *bad_prefixes[] = { ".", "#", NULL };
711
712
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
713
".dpkg-old",
714
".dpkg-divert", NULL };
715
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
716
size_t pre_len = strlen(*pre);
717
if((d_name_len >= pre_len)
718
and strncmp((dirst->d_name), *pre, pre_len) == 0){
719
if(debug){
720
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
721
" with bad prefix %s\n", dirst->d_name, *pre);
722
}
723
bad_name = true;
724
break;
725
}
726
}
727
if(bad_name){
728
continue;
729
}
730
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
731
size_t suf_len = strlen(*suf);
732
if((d_name_len >= suf_len)
733
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
734
== 0)){
735
if(debug){
736
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
737
" with bad suffix %s\n", dirst->d_name, *suf);
738
}
739
bad_name = true;
740
break;
741
}
742
}
743
744
if(bad_name){
745
continue;
746
}
747
}
748
749
char *filename;
750
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
751
if(ret < 0){
752
perror("asprintf");
753
continue;
754
}
755
756
ret = stat(filename, &st);
757
if (ret == -1){
758
perror("stat");
759
free(filename);
760
continue;
761
}
762
885
for(int i = 0; i < numplugins; i++){
886
887
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
888
if(plugin_fd == -1){
889
error(0, errno, "Could not open plugin");
890
free(direntries[i]);
891
continue;
892
}
893
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
894
if(ret == -1){
895
error(0, errno, "stat");
896
TEMP_FAILURE_RETRY(close(plugin_fd));
897
free(direntries[i]);
898
continue;
899
}
900
763
901
/* Ignore non-executable files */
764
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
902
if(not S_ISREG(st.st_mode)
903
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
904
X_OK, 0)) != 0)){
765
905
if(debug){
766
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
767
" with bad type or mode\n", filename);
906
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
907
" with bad type or mode\n",
908
plugindir != NULL ? plugindir : PDIR,
909
direntries[i]->d_name);
768
910
}
769
free(filename);
911
TEMP_FAILURE_RETRY(close(plugin_fd));
912
free(direntries[i]);
770
913
continue;
771
914
}
772
915
773
plugin *p = getplugin(dirst->d_name);
916
plugin *p = getplugin(direntries[i]->d_name);
774
917
if(p == NULL){
775
perror("getplugin");
776
free(filename);
918
error(0, errno, "getplugin");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
920
free(direntries[i]);
777
921
continue;
778
922
}
779
923
if(p->disabled){
780
924
if(debug){
781
925
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
782
dirst->d_name);
926
direntries[i]->d_name);
783
927
}
784
free(filename);
928
TEMP_FAILURE_RETRY(close(plugin_fd));
929
free(direntries[i]);
785
930
continue;
786
931
}
787
932
{
790
935
if(g != NULL){
791
936
for(char **a = g->argv + 1; *a != NULL; a++){
792
937
if(not add_argument(p, *a)){
793
perror("add_argument");
938
error(0, errno, "add_argument");
794
939
}
795
940
}
796
941
/* Add global environment variables */
797
942
for(char **e = g->environ; *e != NULL; e++){
798
943
if(not add_environment(p, *e, false)){
799
perror("add_environment");
944
error(0, errno, "add_environment");
800
945
}
801
946
}
802
947
}
803
948
}
804
/* If this plugin has any environment variables, we will call
805
using execve and need to duplicate the environment from this
806
process, too. */
949
/* If this plugin has any environment variables, we need to
950
duplicate the environment from this process, too. */
807
951
if(p->environ[0] != NULL){
808
952
for(char **e = environ; *e != NULL; e++){
809
953
if(not add_environment(p, *e, false)){
810
perror("add_environment");
954
error(0, errno, "add_environment");
811
955
}
812
956
}
813
957
}
814
958
815
959
int pipefd[2];
816
ret = pipe(pipefd);
817
if (ret == -1){
818
perror("pipe");
819
exitstatus = EXIT_FAILURE;
820
goto fallback;
821
}
960
#ifndef O_CLOEXEC
961
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
962
#else /* O_CLOEXEC */
963
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
964
#endif /* O_CLOEXEC */
965
if(ret == -1){
966
error(0, errno, "pipe");
967
exitstatus = EX_OSERR;
968
free(direntries[i]);
969
goto fallback;
970
}
971
if(pipefd[0] >= FD_SETSIZE){
972
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
973
FD_SETSIZE);
974
TEMP_FAILURE_RETRY(close(pipefd[0]));
975
TEMP_FAILURE_RETRY(close(pipefd[1]));
976
exitstatus = EX_OSERR;
977
free(direntries[i]);
978
goto fallback;
979
}
980
#ifndef O_CLOEXEC
822
981
/* Ask OS to automatic close the pipe on exec */
823
982
ret = set_cloexec_flag(pipefd[0]);
824
983
if(ret < 0){
825
perror("set_cloexec_flag");
826
exitstatus = EXIT_FAILURE;
984
error(0, errno, "set_cloexec_flag");
985
TEMP_FAILURE_RETRY(close(pipefd[0]));
986
TEMP_FAILURE_RETRY(close(pipefd[1]));
987
exitstatus = EX_OSERR;
988
free(direntries[i]);
827
989
goto fallback;
828
990
}
829
991
ret = set_cloexec_flag(pipefd[1]);
830
992
if(ret < 0){
831
perror("set_cloexec_flag");
832
exitstatus = EXIT_FAILURE;
993
error(0, errno, "set_cloexec_flag");
994
TEMP_FAILURE_RETRY(close(pipefd[0]));
995
TEMP_FAILURE_RETRY(close(pipefd[1]));
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
833
998
goto fallback;
834
999
}
1000
#endif /* not O_CLOEXEC */
835
1001
/* Block SIGCHLD until process is safely in process list */
836
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1002
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1003
&sigchld_action.sa_mask,
1004
NULL));
837
1005
if(ret < 0){
838
perror("sigprocmask");
839
exitstatus = EXIT_FAILURE;
1006
error(0, errno, "sigprocmask");
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
840
1009
goto fallback;
841
1010
}
842
1011
/* Starting a new process to be watched */
843
pid_t pid = fork();
1012
pid_t pid;
1013
do {
1014
pid = fork();
1015
} while(pid == -1 and errno == EINTR);
844
1016
if(pid == -1){
845
perror("fork");
846
exitstatus = EXIT_FAILURE;
1017
error(0, errno, "fork");
1018
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1019
&sigchld_action.sa_mask, NULL));
1020
TEMP_FAILURE_RETRY(close(pipefd[0]));
1021
TEMP_FAILURE_RETRY(close(pipefd[1]));
1022
exitstatus = EX_OSERR;
1023
free(direntries[i]);
847
1024
goto fallback;
848
1025
}
849
1026
if(pid == 0){
850
1027
/* this is the child process */
851
1028
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
852
1029
if(ret < 0){
853
perror("sigaction");
854
_exit(EXIT_FAILURE);
1030
error(0, errno, "sigaction");
1031
_exit(EX_OSERR);
855
1032
}
856
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1033
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
857
1034
if(ret < 0){
858
perror("sigprocmask");
859
_exit(EXIT_FAILURE);
1035
error(0, errno, "sigprocmask");
1036
_exit(EX_OSERR);
860
1037
}
861
1038
862
1039
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
863
1040
if(ret == -1){
864
perror("dup2");
865
_exit(EXIT_FAILURE);
1041
error(0, errno, "dup2");
1042
_exit(EX_OSERR);
866
1043
}
867
1044
868
if(dirfd(dir) < 0){
869
/* If dir has no file descriptor, we could not set FD_CLOEXEC
870
above and must now close it manually here. */
871
closedir(dir);
872
}
873
if(p->environ[0] == NULL){
874
if(execv(filename, p->argv) < 0){
875
perror("execv");
876
_exit(EXIT_FAILURE);
877
}
878
} else {
879
if(execve(filename, p->argv, p->environ) < 0){
880
perror("execve");
881
_exit(EXIT_FAILURE);
882
}
1045
if(fexecve(plugin_fd, p->argv,
1046
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1047
error(0, errno, "fexecve for %s/%s",
1048
plugindir != NULL ? plugindir : PDIR,
1049
direntries[i]->d_name);
1050
_exit(EX_OSERR);
883
1051
}
884
1052
/* no return */
885
1053
}
886
1054
/* Parent process */
887
close(pipefd[1]); /* Close unused write end of pipe */
888
free(filename);
889
plugin *new_plugin = getplugin(dirst->d_name);
890
if (new_plugin == NULL){
891
perror("getplugin");
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1055
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1056
pipe */
1057
TEMP_FAILURE_RETRY(close(plugin_fd));
1058
plugin *new_plugin = getplugin(direntries[i]->d_name);
1059
if(new_plugin == NULL){
1060
error(0, errno, "getplugin");
1061
ret = (int)(TEMP_FAILURE_RETRY
1062
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1063
NULL)));
893
1064
if(ret < 0){
894
perror("sigprocmask");
1065
error(0, errno, "sigprocmask");
895
1066
}
896
exitstatus = EXIT_FAILURE;
1067
exitstatus = EX_OSERR;
1068
free(direntries[i]);
897
1069
goto fallback;
898
1070
}
1071
free(direntries[i]);
899
1072
900
1073
new_plugin->pid = pid;
901
1074
new_plugin->fd = pipefd[0];
902
1075
903
1076
/* Unblock SIGCHLD so signal handler can be run if this process
904
1077
has already completed */
905
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1078
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1079
&sigchld_action.sa_mask,
1080
NULL));
906
1081
if(ret < 0){
907
perror("sigprocmask");
908
exitstatus = EXIT_FAILURE;
1082
error(0, errno, "sigprocmask");
1083
exitstatus = EX_OSERR;
909
1084
goto fallback;
910
1085
}
911
1086
912
FD_SET(new_plugin->fd, &rfds_all);
1087
#if defined (__GNUC__) and defined (__GLIBC__)
1088
#if not __GLIBC_PREREQ(2, 16)
1089
#pragma GCC diagnostic push
1090
#pragma GCC diagnostic ignored "-Wsign-conversion"
1091
#endif
1092
#endif
1093
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1094
-Wconversion in GNU libc
1095
before 2.16 */
1096
#if defined (__GNUC__) and defined (__GLIBC__)
1097
#if not __GLIBC_PREREQ(2, 16)
1098
#pragma GCC diagnostic pop
1099
#endif
1100
#endif
913
1101
914
if (maxfd < new_plugin->fd){
1102
if(maxfd < new_plugin->fd){
915
1103
maxfd = new_plugin->fd;
916
1104
}
917
918
1105
}
919
1106
920
closedir(dir);
921
dir = NULL;
922
1107
free(direntries);
1108
direntries = NULL;
1109
TEMP_FAILURE_RETRY(close(dir_fd));
1110
dir_fd = -1;
1111
free_plugin(getplugin(NULL));
1112
923
1113
for(plugin *p = plugin_list; p != NULL; p = p->next){
924
1114
if(p->pid != 0){
925
1115
break;
930
1120
free_plugin_list();
931
1121
}
932
1122
}
933
1123
934
1124
/* Main loop while running plugins exist */
935
1125
while(plugin_list){
936
1126
fd_set rfds = rfds_all;
937
1127
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
938
if (select_ret == -1){
939
perror("select");
940
exitstatus = EXIT_FAILURE;
1128
if(select_ret == -1 and errno != EINTR){
1129
error(0, errno, "select");
1130
exitstatus = EX_OSERR;
941
1131
goto fallback;
942
1132
}
943
1133
/* OK, now either a process completed, or something can be read
944
1134
from one of them */
945
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1135
for(plugin *proc = plugin_list; proc != NULL;){
946
1136
/* Is this process completely done? */
947
if(proc->eof and proc->completed){
1137
if(proc->completed and proc->eof){
948
1138
/* Only accept the plugin output if it exited cleanly */
949
1139
if(not WIFEXITED(proc->status)
950
1140
or WEXITSTATUS(proc->status) != 0){
951
1141
/* Bad exit by plugin */
952
1142
953
1143
if(debug){
954
1144
if(WIFEXITED(proc->status)){
955
fprintf(stderr, "Plugin %u exited with status %d\n",
956
(unsigned int) (proc->pid),
1145
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1146
" status %d\n", proc->name,
1147
(intmax_t) (proc->pid),
957
1148
WEXITSTATUS(proc->status));
958
} else if(WIFSIGNALED(proc->status)) {
959
fprintf(stderr, "Plugin %u killed by signal %d\n",
960
(unsigned int) (proc->pid),
961
WTERMSIG(proc->status));
1149
} else if(WIFSIGNALED(proc->status)){
1150
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1151
" signal %d: %s\n", proc->name,
1152
(intmax_t) (proc->pid),
1153
WTERMSIG(proc->status),
1154
strsignal(WTERMSIG(proc->status)));
962
1155
} else if(WCOREDUMP(proc->status)){
963
fprintf(stderr, "Plugin %d dumped core\n",
964
(unsigned int) (proc->pid));
1156
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1157
" core\n", proc->name, (intmax_t) (proc->pid));
965
1158
}
966
1159
}
967
1160
968
1161
/* Remove the plugin */
969
FD_CLR(proc->fd, &rfds_all);
970
1162
#if defined (__GNUC__) and defined (__GLIBC__)
1163
#if not __GLIBC_PREREQ(2, 16)
1164
#pragma GCC diagnostic push
1165
#pragma GCC diagnostic ignored "-Wsign-conversion"
1166
#endif
1167
#endif
1168
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1169
-Wconversion in GNU libc
1170
before 2.16 */
1171
#if defined (__GNUC__) and defined (__GLIBC__)
1172
#if not __GLIBC_PREREQ(2, 16)
1173
#pragma GCC diagnostic pop
1174
#endif
1175
#endif
1176
971
1177
/* Block signal while modifying process_list */
972
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1178
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1179
(SIG_BLOCK,
1180
&sigchld_action.sa_mask,
1181
NULL));
973
1182
if(ret < 0){
974
perror("sigprocmask");
975
exitstatus = EXIT_FAILURE;
1183
error(0, errno, "sigprocmask");
1184
exitstatus = EX_OSERR;
976
1185
goto fallback;
977
1186
}
1187
1188
plugin *next_plugin = proc->next;
978
1189
free_plugin(proc);
1190
proc = next_plugin;
1191
979
1192
/* We are done modifying process list, so unblock signal */
980
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
981
NULL);
1193
ret = (int)(TEMP_FAILURE_RETRY
1194
(sigprocmask(SIG_UNBLOCK,
1195
&sigchld_action.sa_mask, NULL)));
982
1196
if(ret < 0){
983
perror("sigprocmask");
984
exitstatus = EXIT_FAILURE;
1197
error(0, errno, "sigprocmask");
1198
exitstatus = EX_OSERR;
985
1199
goto fallback;
986
1200
}
987
1201
988
1202
if(plugin_list == NULL){
989
1203
break;
990
1204
}
1205
991
1206
continue;
992
1207
}
993
1208
994
1209
/* This process exited nicely, so print its buffer */
995
1210
996
1211
bool bret = print_out_password(proc->buffer,
997
1212
proc->buffer_length);
998
1213
if(not bret){
999
perror("print_out_password");
1000
exitstatus = EXIT_FAILURE;
1214
error(0, errno, "print_out_password");
1215
exitstatus = EX_IOERR;
1001
1216
}
1002
1217
goto fallback;
1003
1218
}
1004
1219
1005
1220
/* This process has not completed. Does it have any output? */
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1221
#if defined (__GNUC__) and defined (__GLIBC__)
1222
#if not __GLIBC_PREREQ(2, 16)
1223
#pragma GCC diagnostic push
1224
#pragma GCC diagnostic ignored "-Wsign-conversion"
1225
#endif
1226
#endif
1227
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1228
warning from
1229
-Wconversion
1230
in GNU libc
1231
before
1232
2.16 */
1233
#if defined (__GNUC__) and defined (__GLIBC__)
1234
#if not __GLIBC_PREREQ(2, 16)
1235
#pragma GCC diagnostic pop
1236
#endif
1237
#endif
1007
1238
/* This process had nothing to say at this time */
1239
proc = proc->next;
1008
1240
continue;
1009
1241
}
1010
1242
/* Before reading, make the process' data buffer large enough */
1011
1243
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1015
perror("malloc");
1016
exitstatus = EXIT_FAILURE;
1244
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1245
+ (size_t) BUFFER_SIZE);
1246
if(new_buffer == NULL){
1247
error(0, errno, "malloc");
1248
exitstatus = EX_OSERR;
1017
1249
goto fallback;
1018
1250
}
1251
proc->buffer = new_buffer;
1019
1252
proc->buffer_size += BUFFER_SIZE;
1020
1253
}
1021
1254
/* Read from the process */
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1255
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1256
proc->buffer
1257
+ proc->buffer_length,
1258
BUFFER_SIZE));
1259
if(sret < 0){
1025
1260
/* Read error from this process; ignore the error */
1261
proc = proc->next;
1026
1262
continue;
1027
1263
}
1028
if(ret == 0){
1264
if(sret == 0){
1029
1265
/* got EOF */
1030
1266
proc->eof = true;
1031
1267
} else {
1032
proc->buffer_length += (size_t) ret;
1268
proc->buffer_length += (size_t) sret;
1033
1269
}
1034
1270
}
1035
1271
}
1036
1037
1272
1273
1038
1274
fallback:
1039
1275
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1276
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1277
and exitstatus != EX_OK)){
1041
1278
/* Fallback if all plugins failed, none are found or an error
1042
1279
occured */
1043
1280
bool bret;
1044
1281
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1045
1282
char *passwordbuffer = getpass("Password: ");
1046
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1283
size_t len = strlen(passwordbuffer);
1284
/* Strip trailing newline */
1285
if(len > 0 and passwordbuffer[len-1] == '\n'){
1286
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1287
len--;
1288
}
1289
bret = print_out_password(passwordbuffer, len);
1047
1290
if(not bret){
1048
perror("print_out_password");
1049
exitstatus = EXIT_FAILURE;
1291
error(0, errno, "print_out_password");
1292
exitstatus = EX_IOERR;
1050
1293
}
1051
1294
}
1052
1295
1053
1296
/* Restore old signal handler */
1054
1297
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1055
1298
if(ret == -1){
1056
perror("sigaction");
1057
exitstatus = EXIT_FAILURE;
1299
error(0, errno, "sigaction");
1300
exitstatus = EX_OSERR;
1058
1301
}
1059
1302
1060
1303
if(custom_argv != NULL){
1061
1304
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1062
1305
free(*arg);
1064
1307
free(custom_argv);
1065
1308
}
1066
1309
1067
if(dir != NULL){
1068
closedir(dir);
1310
free(direntries);
1311
1312
if(dir_fd != -1){
1313
TEMP_FAILURE_RETRY(close(dir_fd));
1069
1314
}
1070
1315
1071
/* Free the process list and kill the processes */
1316
/* Kill the processes */
1072
1317
for(plugin *p = plugin_list; p != NULL; p = p->next){
1073
1318
if(p->pid != 0){
1074
1319
close(p->fd);
1075
1320
ret = kill(p->pid, SIGTERM);
1076
1321
if(ret == -1 and errno != ESRCH){
1077
1322
/* Set-uid proccesses might not get closed */
1078
perror("kill");
1323
error(0, errno, "kill");
1079
1324
}
1080
1325
}
1081
1326
}
1082
1327
1083
1328
/* Wait for any remaining child processes to terminate */
1084
do{
1329
do {
1085
1330
ret = wait(NULL);
1086
1331
} while(ret >= 0);
1087
1332
if(errno != ECHILD){
1088
perror("wait");
1333
error(0, errno, "wait");
1089
1334
}
1090
1335
1091
1336
free_plugin_list();
1092
1337
1093
1338
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0