To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 133
- compare with another revision
- download diff
- download tarball
- view history from revision 133
- Committer: Teddy Hogeborn
- Date: 2008-08-31 20:01:03 UTC
- Revision ID: teddy@fukt.bsnet.se-20080831200103-wvjp5oagtxj7s25g
* plugin-runner.c: Break a couple of long lines.
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
23
22
*/
24
23
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
25
asprintf() */
27
26
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
36
35
uid_t, gid_t, getuid(), getgid(),
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
40
WEXITSTATUS() */
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
44
readdir(), closedir(), dirfd() */
47
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
53
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
53
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
SIG_UNBLOCK, kill() */
69
65
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
66
74
67
#define BUFFER_SIZE 256
75
68
76
69
#define PDIR "/lib/mandos/plugins.d"
77
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
78
71
79
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
80
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
81
74
75
struct plugin;
76
82
77
typedef struct plugin{
83
78
char *name; /* can be NULL or any plugin name */
84
79
char **argv;
86
81
char **environ;
87
82
int envc;
88
83
bool disabled;
89
84
90
85
/* Variables used for running processes*/
91
86
pid_t pid;
92
87
int fd;
94
89
size_t buffer_size;
95
90
size_t buffer_length;
96
91
bool eof;
97
volatile sig_atomic_t completed;
98
int status;
92
volatile bool completed;
93
volatile int status;
99
94
struct plugin *next;
100
95
} plugin;
101
96
102
97
static plugin *plugin_list = NULL;
103
98
104
/* Gets an existing plugin based on name,
99
/* Gets a existing plugin based on name,
105
100
or if none is found, creates a new one */
106
101
static plugin *getplugin(char *name){
107
/* Check for existing plugin with that name */
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
109
if((p->name == name)
110
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
111
106
return p;
112
107
}
113
108
}
114
109
/* Create a new plugin */
115
plugin *new_plugin = NULL;
116
do {
117
new_plugin = malloc(sizeof(plugin));
118
} while(new_plugin == NULL and errno == EINTR);
119
if(new_plugin == NULL){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
120
112
return NULL;
121
113
}
122
114
char *copy_name = NULL;
123
115
if(name != NULL){
124
do {
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
127
117
if(copy_name == NULL){
128
int e = errno;
129
free(new_plugin);
130
errno = e;
131
118
return NULL;
132
119
}
133
120
}
134
135
*new_plugin = (plugin){ .name = copy_name,
136
.argc = 1,
137
.disabled = false,
138
.next = plugin_list };
139
140
do {
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
143
if(new_plugin->argv == NULL){
144
int e = errno;
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){
145
129
free(copy_name);
146
130
free(new_plugin);
147
errno = e;
148
131
return NULL;
149
132
}
150
133
new_plugin->argv[0] = copy_name;
151
134
new_plugin->argv[1] = NULL;
152
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
135
136
new_plugin->environ = malloc(sizeof(char *));
156
137
if(new_plugin->environ == NULL){
157
int e = errno;
158
138
free(copy_name);
159
139
free(new_plugin->argv);
160
140
free(new_plugin);
161
errno = e;
162
141
return NULL;
163
142
}
164
143
new_plugin->environ[0] = NULL;
165
144
166
145
/* Append the new plugin to the list */
167
146
plugin_list = new_plugin;
168
147
return new_plugin;
172
151
static bool add_to_char_array(const char *new, char ***array,
173
152
int *len){
174
153
/* Resize the pointed-to array to hold one more pointer */
175
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
179
156
/* Malloc check */
180
157
if(*array == NULL){
181
158
return false;
182
159
}
183
160
/* Make a copy of the new string */
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
188
162
if(copy == NULL){
189
163
return false;
190
164
}
205
179
}
206
180
207
181
/* Add to a plugin's environment */
208
static bool add_environment(plugin *p, const char *def, bool replace){
182
static bool add_environment(plugin *p, const char *def){
209
183
if(p == NULL){
210
184
return false;
211
185
}
212
/* namelen = length of name of environment variable */
213
size_t namelen = (size_t)(strchrnul(def, '=') - def);
214
/* Search for this environment variable */
215
for(char **e = p->environ; *e != NULL; e++){
216
if(strncmp(*e, def, namelen + 1) == 0){
217
/* It already exists */
218
if(replace){
219
char *new;
220
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
223
if(new == NULL){
224
return false;
225
}
226
*e = new;
227
strcpy(*e, def);
228
}
229
return true;
230
}
231
}
232
186
return add_to_char_array(def, &(p->environ), &(p->envc));
233
187
}
234
188
235
189
/*
236
190
* Based on the example in the GNU LibC manual chapter 13.13 "File
237
191
* Descriptor Flags".
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
192
* *Note File Descriptor Flags:(libc)Descriptor Flags.
239
193
*/
240
static int set_cloexec_flag(int fd){
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
194
static int set_cloexec_flag(int fd)
195
{
196
int ret = fcntl(fd, F_GETFD, 0);
242
197
/* If reading the flags failed, return error indication now. */
243
198
if(ret < 0){
244
199
return ret;
245
200
}
246
201
/* Store modified flag word in the descriptor. */
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
202
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
203
}
250
204
251
205
252
206
/* Mark processes as completed when they exit, and save their exit
253
207
status. */
254
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
208
void handle_sigchld(__attribute__((unused)) int sig){
256
209
while(true){
257
210
plugin *proc = plugin_list;
258
211
int status;
262
215
break;
263
216
}
264
217
if(pid == -1){
265
if(errno == ECHILD){
266
/* No child processes */
267
break;
218
if (errno != ECHILD){
219
perror("waitpid");
268
220
}
269
perror("waitpid");
221
/* No child processes */
222
break;
270
223
}
271
224
272
225
/* A child exited, find it in process_list */
273
226
while(proc != NULL and proc->pid != pid){
274
227
proc = proc->next;
278
231
continue;
279
232
}
280
233
proc->status = status;
281
proc->completed = 1;
234
proc->completed = true;
282
235
}
283
errno = old_errno;
284
236
}
285
237
286
238
/* Prints out a password to stdout */
287
static bool print_out_password(const char *buffer, size_t length){
239
bool print_out_password(const char *buffer, size_t length){
288
240
ssize_t ret;
241
if(length>0 and buffer[length-1] == '\n'){
242
length--;
243
}
289
244
for(size_t written = 0; written < length; written += (size_t)ret){
290
245
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
291
246
length - written));
308
263
}
309
264
free(plugin_node->environ);
310
265
free(plugin_node->buffer);
311
266
312
267
/* Removes the plugin from the singly-linked list */
313
268
if(plugin_node == plugin_list){
314
269
/* First one - simple */
342
297
struct stat st;
343
298
fd_set rfds_all;
344
299
int ret, maxfd = 0;
345
ssize_t sret;
346
300
uid_t uid = 65534;
347
301
gid_t gid = 65534;
348
302
bool debug = false;
358
312
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
359
313
if(ret == -1){
360
314
perror("sigaddset");
361
exitstatus = EX_OSERR;
315
exitstatus = EXIT_FAILURE;
362
316
goto fallback;
363
317
}
364
318
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
365
319
if(ret == -1){
366
320
perror("sigaction");
367
exitstatus = EX_OSERR;
321
exitstatus = EXIT_FAILURE;
368
322
goto fallback;
369
323
}
370
324
373
327
{ .name = "global-options", .key = 'g',
374
328
.arg = "OPTION[,OPTION[,...]]",
375
329
.doc = "Options passed to all plugins" },
376
{ .name = "global-env", .key = 'G',
330
{ .name = "global-envs", .key = 'e',
377
331
.arg = "VAR=value",
378
332
.doc = "Environment variable passed to all plugins" },
379
333
{ .name = "options-for", .key = 'o',
380
334
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
381
335
.doc = "Options passed only to specified plugin" },
382
{ .name = "env-for", .key = 'E',
336
{ .name = "envs-for", .key = 'f',
383
337
.arg = "PLUGIN:ENV=value",
384
338
.doc = "Environment variable passed to specified plugin" },
385
339
{ .name = "disable", .key = 'd',
386
340
.arg = "PLUGIN",
387
341
.doc = "Disable a specific plugin", .group = 1 },
388
{ .name = "enable", .key = 'e',
389
.arg = "PLUGIN",
390
.doc = "Enable a specific plugin", .group = 1 },
391
342
{ .name = "plugin-dir", .key = 128,
392
343
.arg = "DIRECTORY",
393
344
.doc = "Specify a different plugin directory", .group = 2 },
402
353
.doc = "Group ID the plugins will run as", .group = 3 },
403
354
{ .name = "debug", .key = 132,
404
355
.doc = "Debug mode", .group = 4 },
405
/*
406
* These reproduce what we would get without ARGP_NO_HELP
407
*/
408
{ .name = "help", .key = '?',
409
.doc = "Give this help list", .group = -1 },
410
{ .name = "usage", .key = -3,
411
.doc = "Give a short usage message", .group = -1 },
412
{ .name = "version", .key = 'V',
413
.doc = "Print program version", .group = -1 },
414
356
{ .name = NULL }
415
357
};
416
358
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
418
errno = 0;
419
switch(key){
420
char *tmp;
421
intmax_t tmpmax;
359
error_t parse_opt (int key, char *arg, __attribute__((unused))
360
struct argp_state *state) {
361
/* Get the INPUT argument from `argp_parse', which we know is a
362
pointer to our plugin list pointer. */
363
switch (key) {
422
364
case 'g': /* --global-options */
365
if (arg != NULL){
366
char *p;
367
while((p = strsep(&arg, ",")) != NULL){
368
if(p[0] == '\0'){
369
continue;
370
}
371
if(not add_argument(getplugin(NULL), p)){
372
perror("add_argument");
373
return ARGP_ERR_UNKNOWN;
374
}
375
}
376
}
377
break;
378
case 'e': /* --global-envs */
379
if(arg == NULL){
380
break;
381
}
423
382
{
424
char *plugin_option;
425
while((plugin_option = strsep(&arg, ",")) != NULL){
426
if(not add_argument(getplugin(NULL), plugin_option)){
427
break;
428
}
383
char *envdef = strdup(arg);
384
if(envdef == NULL){
385
break;
386
}
387
if(not add_environment(getplugin(NULL), envdef)){
388
perror("add_environment");
429
389
}
430
390
}
431
391
break;
432
case 'G': /* --global-env */
433
add_environment(getplugin(NULL), arg, true);
434
break;
435
392
case 'o': /* --options-for */
436
{
437
char *option_list = strchr(arg, ':');
438
if(option_list == NULL){
439
argp_error(state, "No colon in \"%s\"", arg);
440
errno = EINVAL;
441
break;
442
}
443
*option_list = '\0';
444
option_list++;
445
if(arg[0] == '\0'){
446
argp_error(state, "Empty plugin name");
447
errno = EINVAL;
448
break;
449
}
450
char *option;
451
while((option = strsep(&option_list, ",")) != NULL){
452
if(not add_argument(getplugin(arg), option)){
453
break;
393
if (arg != NULL){
394
char *p_name = strsep(&arg, ":");
395
if(p_name[0] == '\0'){
396
break;
397
}
398
char *opt = strsep(&arg, ":");
399
if(opt[0] == '\0'){
400
break;
401
}
402
if(opt != NULL){
403
char *p;
404
while((p = strsep(&opt, ",")) != NULL){
405
if(p[0] == '\0'){
406
continue;
407
}
408
if(not add_argument(getplugin(p_name), p)){
409
perror("add_argument");
410
return ARGP_ERR_UNKNOWN;
411
}
454
412
}
455
413
}
456
414
}
457
415
break;
458
case 'E': /* --env-for */
416
case 'f': /* --envs-for */
417
if(arg == NULL){
418
break;
419
}
459
420
{
460
421
char *envdef = strchr(arg, ':');
461
422
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
break;
465
}
466
*envdef = '\0';
423
break;
424
}
425
char *p_name = strndup(arg, (size_t) (envdef-arg));
426
if(p_name == NULL){
427
break;
428
}
467
429
envdef++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
430
if(not add_environment(getplugin(p_name), envdef)){
431
perror("add_environment");
472
432
}
473
add_environment(getplugin(arg), envdef, true);
474
433
}
475
434
break;
476
435
case 'd': /* --disable */
477
{
478
plugin *p = getplugin(arg);
479
if(p != NULL){
480
p->disabled = true;
481
}
482
}
483
break;
484
case 'e': /* --enable */
485
{
486
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = false;
489
}
436
if (arg != NULL){
437
plugin *p = getplugin(arg);
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
440
}
441
p->disabled = true;
490
442
}
491
443
break;
492
444
case 128: /* --plugin-dir */
493
free(plugindir);
494
445
plugindir = strdup(arg);
446
if(plugindir == NULL){
447
perror("strdup");
448
}
495
449
break;
496
450
case 129: /* --config-file */
497
/* This is already done by parse_opt_config_file() */
498
break;
451
argfile = strdup(arg);
452
if(argfile == NULL){
453
perror("strdup");
454
}
455
break;
499
456
case 130: /* --userid */
500
tmpmax = strtoimax(arg, &tmp, 10);
501
if(errno != 0 or tmp == arg or *tmp != '\0'
502
or tmpmax != (uid_t)tmpmax){
503
argp_error(state, "Bad user ID number: \"%s\", using %"
504
PRIdMAX, arg, (intmax_t)uid);
505
break;
506
}
507
uid = (uid_t)tmpmax;
457
uid = (uid_t)strtol(arg, NULL, 10);
508
458
break;
509
459
case 131: /* --groupid */
510
tmpmax = strtoimax(arg, &tmp, 10);
511
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmpmax != (gid_t)tmpmax){
513
argp_error(state, "Bad group ID number: \"%s\", using %"
514
PRIdMAX, arg, (intmax_t)gid);
515
break;
516
}
517
gid = (gid_t)tmpmax;
460
gid = (gid_t)strtol(arg, NULL, 10);
518
461
break;
519
462
case 132: /* --debug */
520
463
debug = true;
521
464
break;
522
/*
523
* These reproduce what we would get without ARGP_NO_HELP
524
*/
525
case '?': /* --help */
526
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
527
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
528
case -3: /* --usage */
529
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
530
argp_state_help(state, state->out_stream,
531
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
532
case 'V': /* --version */
533
fprintf(state->out_stream, "%s\n", argp_program_version);
534
exit(EXIT_SUCCESS);
535
break;
536
/*
537
* When adding more options before this line, remember to also add a
538
* "case" to the "parse_opt_config_file" function below.
539
*/
540
case ARGP_KEY_ARG:
541
/* Cryptsetup always passes an argument, which is an empty
542
string if "none" was specified in /etc/crypttab. So if
543
argument was empty, we ignore it silently. */
544
if(arg[0] == '\0'){
545
break;
546
}
547
default:
548
return ARGP_ERR_UNKNOWN;
549
}
550
return errno; /* Set to 0 at start */
551
}
552
553
/* This option parser is the same as parse_opt() above, except it
554
ignores everything but the --config-file option. */
555
error_t parse_opt_config_file(int key, char *arg,
556
__attribute__((unused))
557
struct argp_state *state){
558
errno = 0;
559
switch(key){
560
case 'g': /* --global-options */
561
case 'G': /* --global-env */
562
case 'o': /* --options-for */
563
case 'E': /* --env-for */
564
case 'd': /* --disable */
565
case 'e': /* --enable */
566
case 128: /* --plugin-dir */
567
break;
568
case 129: /* --config-file */
569
free(argfile);
570
argfile = strdup(arg);
571
break;
572
case 130: /* --userid */
573
case 131: /* --groupid */
574
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
578
case ARGP_KEY_ARG:
579
break;
580
default:
581
return ARGP_ERR_UNKNOWN;
582
}
583
return errno;
584
}
585
586
struct argp argp = { .options = options,
587
.parser = parse_opt_config_file,
588
.args_doc = "",
465
case ARGP_KEY_ARG:
466
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
467
break;
468
case ARGP_KEY_END:
469
break;
470
default:
471
return ARGP_ERR_UNKNOWN;
472
}
473
return 0;
474
}
475
476
struct argp argp = { .options = options, .parser = parse_opt,
477
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
589
478
.doc = "Mandos plugin runner -- Run plugins" };
590
479
591
/* Parse using parse_opt_config_file() in order to get the custom
592
config file location, if any. */
593
ret = argp_parse(&argp, argc, argv,
594
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
595
NULL, NULL);
596
switch(ret){
597
case 0:
598
break;
599
case ENOMEM:
600
default:
601
errno = ret;
602
perror("argp_parse");
603
exitstatus = EX_OSERR;
604
goto fallback;
605
case EINVAL:
606
exitstatus = EX_USAGE;
480
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
481
if (ret == ARGP_ERR_UNKNOWN){
482
fprintf(stderr, "Unknown error while parsing arguments\n");
483
exitstatus = EXIT_FAILURE;
607
484
goto fallback;
608
485
}
609
610
/* Reset to the normal argument parser */
611
argp.parser = parse_opt;
612
613
/* Open the configfile if available */
614
if(argfile == NULL){
486
487
/* Opens the configfile if aviable */
488
if (argfile == NULL){
615
489
conffp = fopen(AFILE, "r");
616
490
} else {
617
491
conffp = fopen(argfile, "r");
618
}
492
}
619
493
if(conffp != NULL){
620
494
char *org_line = NULL;
621
495
char *p, *arg, *new_arg, *line;
622
496
size_t size = 0;
497
ssize_t sret;
623
498
const char whitespace_delims[] = " \r\t\f\v\n";
624
499
const char comment_delim[] = "#";
625
500
626
501
custom_argc = 1;
627
502
custom_argv = malloc(sizeof(char*) * 2);
628
503
if(custom_argv == NULL){
629
504
perror("malloc");
630
exitstatus = EX_OSERR;
505
exitstatus = EXIT_FAILURE;
631
506
goto fallback;
632
507
}
633
508
custom_argv[0] = argv[0];
634
509
custom_argv[1] = NULL;
635
510
636
511
/* for each line in the config file, strip whitespace and ignore
637
512
commented text */
638
513
while(true){
640
515
if(sret == -1){
641
516
break;
642
517
}
643
518
644
519
line = org_line;
645
520
arg = strsep(&line, comment_delim);
646
521
while((p = strsep(&arg, whitespace_delims)) != NULL){
650
525
new_arg = strdup(p);
651
526
if(new_arg == NULL){
652
527
perror("strdup");
653
exitstatus = EX_OSERR;
528
exitstatus = EXIT_FAILURE;
654
529
free(org_line);
655
530
goto fallback;
656
531
}
660
535
* ((unsigned int) custom_argc + 1));
661
536
if(custom_argv == NULL){
662
537
perror("realloc");
663
exitstatus = EX_OSERR;
538
exitstatus = EXIT_FAILURE;
664
539
free(org_line);
665
540
goto fallback;
666
541
}
667
542
custom_argv[custom_argc-1] = new_arg;
668
custom_argv[custom_argc] = NULL;
543
custom_argv[custom_argc] = NULL;
669
544
}
670
545
}
671
do {
672
ret = fclose(conffp);
673
} while(ret == EOF and errno == EINTR);
674
if(ret == EOF){
675
perror("fclose");
676
exitstatus = EX_IOERR;
677
goto fallback;
678
}
679
546
free(org_line);
680
} else {
547
} else{
681
548
/* Check for harmful errors and go to fallback. Other errors might
682
549
not affect opening plugins */
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
550
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
551
perror("fopen");
685
exitstatus = EX_OSERR;
552
exitstatus = EXIT_FAILURE;
686
553
goto fallback;
687
554
}
688
555
}
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
556
/* If there was any arguments from configuration file,
557
pass them to parser as command arguments */
691
558
if(custom_argv != NULL){
692
ret = argp_parse(&argp, custom_argc, custom_argv,
693
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
694
NULL, NULL);
695
switch(ret){
696
case 0:
697
break;
698
case ENOMEM:
699
default:
700
errno = ret;
701
perror("argp_parse");
702
exitstatus = EX_OSERR;
703
goto fallback;
704
case EINVAL:
705
exitstatus = EX_CONFIG;
559
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
560
if (ret == ARGP_ERR_UNKNOWN){
561
fprintf(stderr, "Unknown error while parsing arguments\n");
562
exitstatus = EXIT_FAILURE;
706
563
goto fallback;
707
564
}
708
565
}
709
566
710
/* Parse actual command line arguments, to let them override the
711
config file */
712
ret = argp_parse(&argp, argc, argv,
713
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
714
NULL, NULL);
715
switch(ret){
716
case 0:
717
break;
718
case ENOMEM:
719
default:
720
errno = ret;
721
perror("argp_parse");
722
exitstatus = EX_OSERR;
723
goto fallback;
724
case EINVAL:
725
exitstatus = EX_USAGE;
726
goto fallback;
727
}
728
729
567
if(debug){
730
568
for(plugin *p = plugin_list; p != NULL; p=p->next){
731
569
fprintf(stderr, "Plugin: %s has %d arguments\n",
733
571
for(char **a = p->argv; *a != NULL; a++){
734
572
fprintf(stderr, "\tArg: %s\n", *a);
735
573
}
736
fprintf(stderr, "...and %d environment variables\n", p->envc);
574
fprintf(stderr, "...and %u environment variables\n", p->envc);
737
575
for(char **a = p->environ; *a != NULL; a++){
738
576
fprintf(stderr, "\t%s\n", *a);
739
577
}
740
578
}
741
579
}
742
580
743
581
/* Strip permissions down to nobody */
582
ret = setuid(uid);
583
if (ret == -1){
584
perror("setuid");
585
}
744
586
setgid(gid);
745
if(ret == -1){
587
if (ret == -1){
746
588
perror("setgid");
747
589
}
748
ret = setuid(uid);
749
if(ret == -1){
750
perror("setuid");
751
}
752
753
/* Open plugin directory with close_on_exec flag */
590
591
if (plugindir == NULL){
592
dir = opendir(PDIR);
593
} else {
594
dir = opendir(plugindir);
595
}
596
597
if(dir == NULL){
598
perror("Could not open plugin dir");
599
exitstatus = EXIT_FAILURE;
600
goto fallback;
601
}
602
603
/* Set the FD_CLOEXEC flag on the directory, if possible */
754
604
{
755
int dir_fd = -1;
756
if(plugindir == NULL){
757
dir_fd = open(PDIR, O_RDONLY |
758
#ifdef O_CLOEXEC
759
O_CLOEXEC
760
#else /* not O_CLOEXEC */
761
0
762
#endif /* not O_CLOEXEC */
763
);
764
} else {
765
dir_fd = open(plugindir, O_RDONLY |
766
#ifdef O_CLOEXEC
767
O_CLOEXEC
768
#else /* not O_CLOEXEC */
769
0
770
#endif /* not O_CLOEXEC */
771
);
772
}
773
if(dir_fd == -1){
774
perror("Could not open plugin dir");
775
exitstatus = EX_UNAVAILABLE;
776
goto fallback;
777
}
778
779
#ifndef O_CLOEXEC
780
/* Set the FD_CLOEXEC flag on the directory */
781
ret = set_cloexec_flag(dir_fd);
782
if(ret < 0){
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
785
exitstatus = EX_OSERR;
786
goto fallback;
787
}
788
#endif /* O_CLOEXEC */
789
790
dir = fdopendir(dir_fd);
791
if(dir == NULL){
792
perror("Could not open plugin dir");
793
TEMP_FAILURE_RETRY(close(dir_fd));
794
exitstatus = EX_OSERR;
795
goto fallback;
605
int dir_fd = dirfd(dir);
606
if(dir_fd >= 0){
607
ret = set_cloexec_flag(dir_fd);
608
if(ret < 0){
609
perror("set_cloexec_flag");
610
exitstatus = EXIT_FAILURE;
611
goto fallback;
612
}
796
613
}
797
614
}
798
615
799
616
FD_ZERO(&rfds_all);
800
617
801
618
/* Read and execute any executable in the plugin directory*/
802
619
while(true){
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
620
dirst = readdir(dir);
806
621
807
/* All directory entries have been processed */
622
// All directory entries have been processed
808
623
if(dirst == NULL){
809
if(errno == EBADF){
624
if (errno == EBADF){
810
625
perror("readdir");
811
exitstatus = EX_IOERR;
626
exitstatus = EXIT_FAILURE;
812
627
goto fallback;
813
628
}
814
629
break;
816
631
817
632
d_name_len = strlen(dirst->d_name);
818
633
819
/* Ignore dotfiles, backup files and other junk */
634
// Ignore dotfiles, backup files and other junk
820
635
{
821
636
bool bad_name = false;
822
637
824
639
825
640
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
826
641
".dpkg-old",
827
".dpkg-bak",
828
642
".dpkg-divert", NULL };
829
643
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
830
644
size_t pre_len = strlen(*pre);
859
673
continue;
860
674
}
861
675
}
862
676
863
677
char *filename;
864
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
867
} else {
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
871
}
678
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
872
679
if(ret < 0){
873
680
perror("asprintf");
874
681
continue;
875
682
}
876
683
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
878
if(ret == -1){
684
ret = stat(filename, &st);
685
if (ret == -1){
879
686
perror("stat");
880
687
free(filename);
881
688
continue;
882
689
}
883
690
884
691
/* Ignore non-executable files */
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
692
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
693
if(debug){
888
694
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
695
" with bad type or mode\n", filename);
917
723
}
918
724
/* Add global environment variables */
919
725
for(char **e = g->environ; *e != NULL; e++){
920
if(not add_environment(p, *e, false)){
726
if(not add_environment(p, *e)){
921
727
perror("add_environment");
922
728
}
923
729
}
928
734
process, too. */
929
735
if(p->environ[0] != NULL){
930
736
for(char **e = environ; *e != NULL; e++){
931
if(not add_environment(p, *e, false)){
737
char *copy = strdup(*e);
738
if(copy == NULL){
739
perror("strdup");
740
continue;
741
}
742
if(not add_environment(p, copy)){
932
743
perror("add_environment");
933
744
}
934
745
}
935
746
}
936
747
937
748
int pipefd[2];
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
939
if(ret == -1){
749
ret = pipe(pipefd);
750
if (ret == -1){
940
751
perror("pipe");
941
exitstatus = EX_OSERR;
752
exitstatus = EXIT_FAILURE;
942
753
goto fallback;
943
754
}
944
755
/* Ask OS to automatic close the pipe on exec */
945
756
ret = set_cloexec_flag(pipefd[0]);
946
757
if(ret < 0){
947
758
perror("set_cloexec_flag");
948
exitstatus = EX_OSERR;
759
exitstatus = EXIT_FAILURE;
949
760
goto fallback;
950
761
}
951
762
ret = set_cloexec_flag(pipefd[1]);
952
763
if(ret < 0){
953
764
perror("set_cloexec_flag");
954
exitstatus = EX_OSERR;
765
exitstatus = EXIT_FAILURE;
955
766
goto fallback;
956
767
}
957
768
/* Block SIGCHLD until process is safely in process list */
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
&sigchld_action.sa_mask,
960
NULL));
769
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
961
770
if(ret < 0){
962
771
perror("sigprocmask");
963
exitstatus = EX_OSERR;
772
exitstatus = EXIT_FAILURE;
964
773
goto fallback;
965
774
}
966
/* Starting a new process to be watched */
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
775
// Starting a new process to be watched
776
pid_t pid = fork();
971
777
if(pid == -1){
972
778
perror("fork");
973
exitstatus = EX_OSERR;
779
exitstatus = EXIT_FAILURE;
974
780
goto fallback;
975
781
}
976
782
if(pid == 0){
978
784
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
785
if(ret < 0){
980
786
perror("sigaction");
981
_exit(EX_OSERR);
787
_exit(EXIT_FAILURE);
982
788
}
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
789
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
790
if(ret < 0){
985
791
perror("sigprocmask");
986
_exit(EX_OSERR);
792
_exit(EXIT_FAILURE);
987
793
}
988
794
989
795
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
796
if(ret == -1){
991
797
perror("dup2");
992
_exit(EX_OSERR);
798
_exit(EXIT_FAILURE);
993
799
}
994
800
995
801
if(dirfd(dir) < 0){
1000
806
if(p->environ[0] == NULL){
1001
807
if(execv(filename, p->argv) < 0){
1002
808
perror("execv");
1003
_exit(EX_OSERR);
809
_exit(EXIT_FAILURE);
1004
810
}
1005
811
} else {
1006
812
if(execve(filename, p->argv, p->environ) < 0){
1007
813
perror("execve");
1008
_exit(EX_OSERR);
814
_exit(EXIT_FAILURE);
1009
815
}
1010
816
}
1011
817
/* no return */
1012
818
}
1013
819
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
820
close(pipefd[1]); /* Close unused write end of pipe */
1016
821
free(filename);
1017
822
plugin *new_plugin = getplugin(dirst->d_name);
1018
if(new_plugin == NULL){
823
if (new_plugin == NULL){
1019
824
perror("getplugin");
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
NULL)));
825
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1023
826
if(ret < 0){
1024
827
perror("sigprocmask");
1025
828
}
1026
exitstatus = EX_OSERR;
829
exitstatus = EXIT_FAILURE;
1027
830
goto fallback;
1028
831
}
1029
832
1032
835
1033
836
/* Unblock SIGCHLD so signal handler can be run if this process
1034
837
has already completed */
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
838
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1038
839
if(ret < 0){
1039
840
perror("sigprocmask");
1040
exitstatus = EX_OSERR;
841
exitstatus = EXIT_FAILURE;
1041
842
goto fallback;
1042
843
}
1043
844
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
845
FD_SET(new_plugin->fd, &rfds_all);
1046
846
1047
if(maxfd < new_plugin->fd){
847
if (maxfd < new_plugin->fd){
1048
848
maxfd = new_plugin->fd;
1049
849
}
850
1050
851
}
1051
852
1052
TEMP_FAILURE_RETRY(closedir(dir));
853
closedir(dir);
1053
854
dir = NULL;
1054
free_plugin(getplugin(NULL));
1055
855
1056
856
for(plugin *p = plugin_list; p != NULL; p = p->next){
1057
857
if(p->pid != 0){
1058
858
break;
1063
863
free_plugin_list();
1064
864
}
1065
865
}
1066
866
1067
867
/* Main loop while running plugins exist */
1068
868
while(plugin_list){
1069
869
fd_set rfds = rfds_all;
1070
870
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
if(select_ret == -1 and errno != EINTR){
871
if (select_ret == -1){
1072
872
perror("select");
1073
exitstatus = EX_OSERR;
873
exitstatus = EXIT_FAILURE;
1074
874
goto fallback;
1075
875
}
1076
876
/* OK, now either a process completed, or something can be read
1077
877
from one of them */
1078
for(plugin *proc = plugin_list; proc != NULL;){
878
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1079
879
/* Is this process completely done? */
1080
if(proc->completed and proc->eof){
880
if(proc->eof and proc->completed){
1081
881
/* Only accept the plugin output if it exited cleanly */
1082
882
if(not WIFEXITED(proc->status)
1083
883
or WEXITSTATUS(proc->status) != 0){
1084
884
/* Bad exit by plugin */
1085
885
1086
886
if(debug){
1087
887
if(WIFEXITED(proc->status)){
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
888
fprintf(stderr, "Plugin %u exited with status %d\n",
889
(unsigned int) (proc->pid),
1091
890
WEXITSTATUS(proc->status));
1092
} else if(WIFSIGNALED(proc->status)){
1093
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1094
" signal %d: %s\n", proc->name,
1095
(intmax_t) (proc->pid),
1096
WTERMSIG(proc->status),
1097
strsignal(WTERMSIG(proc->status)));
891
} else if(WIFSIGNALED(proc->status)) {
892
fprintf(stderr, "Plugin %u killed by signal %d\n",
893
(unsigned int) (proc->pid),
894
WTERMSIG(proc->status));
1098
895
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
896
fprintf(stderr, "Plugin %d dumped core\n",
897
(unsigned int) (proc->pid));
1101
898
}
1102
899
}
1103
900
1104
901
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
902
FD_CLR(proc->fd, &rfds_all);
903
1108
904
/* Block signal while modifying process_list */
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
(SIG_BLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
905
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1113
906
if(ret < 0){
1114
907
perror("sigprocmask");
1115
exitstatus = EX_OSERR;
908
exitstatus = EXIT_FAILURE;
1116
909
goto fallback;
1117
910
}
1118
1119
plugin *next_plugin = proc->next;
1120
911
free_plugin(proc);
1121
proc = next_plugin;
1122
1123
912
/* We are done modifying process list, so unblock signal */
1124
ret = (int)(TEMP_FAILURE_RETRY
1125
(sigprocmask(SIG_UNBLOCK,
1126
&sigchld_action.sa_mask, NULL)));
913
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
914
NULL);
1127
915
if(ret < 0){
1128
916
perror("sigprocmask");
1129
exitstatus = EX_OSERR;
917
exitstatus = EXIT_FAILURE;
1130
918
goto fallback;
1131
919
}
1132
920
1133
921
if(plugin_list == NULL){
1134
922
break;
1135
923
}
1136
1137
924
continue;
1138
925
}
1139
926
1140
927
/* This process exited nicely, so print its buffer */
1141
928
1142
929
bool bret = print_out_password(proc->buffer,
1143
930
proc->buffer_length);
1144
931
if(not bret){
1145
932
perror("print_out_password");
1146
exitstatus = EX_IOERR;
933
exitstatus = EXIT_FAILURE;
1147
934
}
1148
935
goto fallback;
1149
936
}
1150
937
1151
938
/* This process has not completed. Does it have any output? */
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
939
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
940
/* This process had nothing to say at this time */
1156
proc = proc->next;
1157
941
continue;
1158
942
}
1159
943
/* Before reading, make the process' data buffer large enough */
1160
944
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1161
945
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
946
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
947
if (proc->buffer == NULL){
1164
948
perror("malloc");
1165
exitstatus = EX_OSERR;
949
exitstatus = EXIT_FAILURE;
1166
950
goto fallback;
1167
951
}
1168
952
proc->buffer_size += BUFFER_SIZE;
1169
953
}
1170
954
/* Read from the process */
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
proc->buffer
1173
+ proc->buffer_length,
1174
BUFFER_SIZE));
1175
if(sret < 0){
955
ret = read(proc->fd, proc->buffer + proc->buffer_length,
956
BUFFER_SIZE);
957
if(ret < 0){
1176
958
/* Read error from this process; ignore the error */
1177
proc = proc->next;
1178
959
continue;
1179
960
}
1180
if(sret == 0){
961
if(ret == 0){
1181
962
/* got EOF */
1182
963
proc->eof = true;
1183
964
} else {
1184
proc->buffer_length += (size_t) sret;
965
proc->buffer_length += (size_t) ret;
1185
966
}
1186
967
}
1187
968
}
1188
1189
969
970
1190
971
fallback:
1191
972
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
973
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1194
974
/* Fallback if all plugins failed, none are found or an error
1195
975
occured */
1196
976
bool bret;
1197
977
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1198
978
char *passwordbuffer = getpass("Password: ");
1199
size_t len = strlen(passwordbuffer);
1200
/* Strip trailing newline */
1201
if(len > 0 and passwordbuffer[len-1] == '\n'){
1202
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1203
len--;
1204
}
1205
bret = print_out_password(passwordbuffer, len);
979
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1206
980
if(not bret){
1207
981
perror("print_out_password");
1208
exitstatus = EX_IOERR;
982
exitstatus = EXIT_FAILURE;
1209
983
}
1210
984
}
1211
985
1213
987
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
988
if(ret == -1){
1215
989
perror("sigaction");
1216
exitstatus = EX_OSERR;
990
exitstatus = EXIT_FAILURE;
1217
991
}
1218
992
1219
993
if(custom_argv != NULL){
1220
994
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1221
995
free(*arg);
1227
1001
closedir(dir);
1228
1002
}
1229
1003
1230
/* Kill the processes */
1004
/* Free the process list and kill the processes */
1231
1005
for(plugin *p = plugin_list; p != NULL; p = p->next){
1232
1006
if(p->pid != 0){
1233
1007
close(p->fd);
1240
1014
}
1241
1015
1242
1016
/* Wait for any remaining child processes to terminate */
1243
do {
1017
do{
1244
1018
ret = wait(NULL);
1245
1019
} while(ret >= 0);
1246
1020
if(errno != ECHILD){
1247
1021
perror("wait");
1248
1022
}
1249
1023
1250
1024
free_plugin_list();
1251
1025
1252
1026
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0