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- Committer: Teddy Hogeborn
- Date: 2009-05-21 20:04:06 UTC
- Revision ID: teddy@fukt.bsnet.se-20090521200406-2d5yqwuelzai5si8
* Makefile (GNUTLS_CFLAGS, GNUTLS_LIBS): Use "pkg-config" instead of
"libgnutls-config".
"libgnutls-config".
- files added:
- .bzr-builddeb
- debian
- debian/po
- 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:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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
27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
32
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
46
47
fcntl(), setuid(), setgid(),
47
48
F_GETFD, F_SETFD, FD_CLOEXEC,
48
49
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
dup2(), STDOUT_FILENO, _exit(),
50
51
execv(), write(), read(),
51
52
close() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
61
62
#include <signal.h> /* struct sigaction, sigemptyset(),
62
63
sigaddset(), sigaction(),
63
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
65
67
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
66
69
67
70
#define BUFFER_SIZE 256
68
71
69
72
#define PDIR "/lib/mandos/plugins.d"
70
73
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
74
72
const char *argp_program_version = "plugin-runner 1.0";
75
const char *argp_program_version = "plugin-runner " VERSION;
73
76
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
77
75
struct process;
76
77
typedef struct process{
78
pid_t pid;
79
int fd;
80
char *buffer;
81
size_t buffer_size;
82
size_t buffer_length;
83
bool eof;
84
volatile bool completed;
85
volatile int status;
86
struct process *next;
87
} process;
88
89
78
typedef struct plugin{
90
79
char *name; /* can be NULL or any plugin name */
91
80
char **argv;
93
82
char **environ;
94
83
int envc;
95
84
bool disabled;
85
86
/* Variables used for running processes*/
87
pid_t pid;
88
int fd;
89
char *buffer;
90
size_t buffer_size;
91
size_t buffer_length;
92
bool eof;
93
volatile sig_atomic_t completed;
94
int status;
96
95
struct plugin *next;
97
96
} plugin;
98
97
99
static plugin *getplugin(char *name, plugin **plugin_list){
100
for (plugin *p = *plugin_list; p != NULL; p = p->next){
101
if ((p->name == name)
102
or (p->name and name and (strcmp(p->name, name) == 0))){
98
static plugin *plugin_list = NULL;
99
100
/* Gets an existing plugin based on name,
101
or if none is found, creates a new one */
102
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
if((p->name == name)
106
or (p->name and name and (strcmp(p->name, name) == 0))){
103
107
return p;
104
108
}
105
109
}
106
110
/* Create a new plugin */
107
111
plugin *new_plugin = malloc(sizeof(plugin));
108
if (new_plugin == NULL){
112
if(new_plugin == NULL){
109
113
return NULL;
110
114
}
111
115
char *copy_name = NULL;
112
116
if(name != NULL){
113
117
copy_name = strdup(name);
114
118
if(copy_name == NULL){
119
free(new_plugin);
115
120
return NULL;
116
121
}
117
122
}
118
123
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
124
*new_plugin = (plugin){ .name = copy_name,
125
.argc = 1,
126
.disabled = false,
127
.next = plugin_list };
124
128
125
129
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
130
if(new_plugin->argv == NULL){
127
131
free(copy_name);
128
132
free(new_plugin);
129
133
return NULL;
130
134
}
131
135
new_plugin->argv[0] = copy_name;
132
136
new_plugin->argv[1] = NULL;
133
137
134
138
new_plugin->environ = malloc(sizeof(char *));
135
139
if(new_plugin->environ == NULL){
136
140
free(copy_name);
139
143
return NULL;
140
144
}
141
145
new_plugin->environ[0] = NULL;
146
142
147
/* Append the new plugin to the list */
143
*plugin_list = new_plugin;
148
plugin_list = new_plugin;
144
149
return new_plugin;
145
150
}
146
151
176
181
}
177
182
178
183
/* Add to a plugin's environment */
179
static bool add_environment(plugin *p, const char *def){
184
static bool add_environment(plugin *p, const char *def, bool replace){
180
185
if(p == NULL){
181
186
return false;
182
187
}
188
/* namelen = length of name of environment variable */
189
size_t namelen = (size_t)(strchrnul(def, '=') - def);
190
/* Search for this environment variable */
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
193
/* It already exists */
194
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
196
if(new == NULL){
197
return false;
198
}
199
*e = new;
200
strcpy(*e, def);
201
}
202
return true;
203
}
204
}
183
205
return add_to_char_array(def, &(p->environ), &(p->envc));
184
206
}
185
207
186
187
208
/*
188
209
* Based on the example in the GNU LibC manual chapter 13.13 "File
189
210
* Descriptor Flags".
190
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
191
212
*/
192
static int set_cloexec_flag(int fd)
193
{
213
static int set_cloexec_flag(int fd){
194
214
int ret = fcntl(fd, F_GETFD, 0);
195
215
/* If reading the flags failed, return error indication now. */
196
216
if(ret < 0){
200
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
201
221
}
202
222
203
process *process_list = NULL;
204
223
205
224
/* Mark processes as completed when they exit, and save their exit
206
225
status. */
207
void handle_sigchld(__attribute__((unused)) int sig){
226
static void handle_sigchld(__attribute__((unused)) int sig){
227
int old_errno = errno;
208
228
while(true){
209
process *proc = process_list;
229
plugin *proc = plugin_list;
210
230
int status;
211
231
pid_t pid = waitpid(-1, &status, WNOHANG);
212
232
if(pid == 0){
214
234
break;
215
235
}
216
236
if(pid == -1){
217
if (errno != ECHILD){
218
perror("waitpid");
237
if(errno == ECHILD){
238
/* No child processes */
239
break;
219
240
}
220
/* No child processes */
221
break;
241
perror("waitpid");
222
242
}
223
243
224
244
/* A child exited, find it in process_list */
225
245
while(proc != NULL and proc->pid != pid){
226
246
proc = proc->next;
230
250
continue;
231
251
}
232
252
proc->status = status;
233
proc->completed = true;
253
proc->completed = 1;
234
254
}
255
errno = old_errno;
235
256
}
236
257
237
bool print_out_password(const char *buffer, size_t length){
258
/* Prints out a password to stdout */
259
static bool print_out_password(const char *buffer, size_t length){
238
260
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
242
261
for(size_t written = 0; written < length; written += (size_t)ret){
243
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
244
263
length - written));
249
268
return true;
250
269
}
251
270
252
static void free_plugin_list(plugin *plugin_list){
253
for(plugin *next; plugin_list != NULL; plugin_list = next){
254
next = plugin_list->next;
255
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
256
free(*arg);
257
}
258
free(plugin_list->argv);
259
for(char **env = plugin_list->environ; *env != NULL; env++){
260
free(*env);
261
}
262
free(plugin_list->environ);
263
free(plugin_list);
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
295
}
296
}
297
298
free(plugin_node);
299
}
300
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
264
304
}
265
305
}
266
306
274
314
struct stat st;
275
315
fd_set rfds_all;
276
316
int ret, maxfd = 0;
317
ssize_t sret;
318
intmax_t tmpmax;
277
319
uid_t uid = 65534;
278
320
gid_t gid = 65534;
279
321
bool debug = false;
304
346
{ .name = "global-options", .key = 'g',
305
347
.arg = "OPTION[,OPTION[,...]]",
306
348
.doc = "Options passed to all plugins" },
307
{ .name = "global-envs", .key = 'e',
349
{ .name = "global-env", .key = 'G',
308
350
.arg = "VAR=value",
309
351
.doc = "Environment variable passed to all plugins" },
310
352
{ .name = "options-for", .key = 'o',
311
353
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
312
354
.doc = "Options passed only to specified plugin" },
313
{ .name = "envs-for", .key = 'f',
355
{ .name = "env-for", .key = 'E',
314
356
.arg = "PLUGIN:ENV=value",
315
357
.doc = "Environment variable passed to specified plugin" },
316
358
{ .name = "disable", .key = 'd',
317
359
.arg = "PLUGIN",
318
360
.doc = "Disable a specific plugin", .group = 1 },
361
{ .name = "enable", .key = 'e',
362
.arg = "PLUGIN",
363
.doc = "Enable a specific plugin", .group = 1 },
319
364
{ .name = "plugin-dir", .key = 128,
320
365
.arg = "DIRECTORY",
321
366
.doc = "Specify a different plugin directory", .group = 2 },
333
378
{ .name = NULL }
334
379
};
335
380
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
340
switch (key) {
341
case 'g':
342
if (arg != NULL){
343
char *p;
344
while((p = strsep(&arg, ",")) != NULL){
345
if(p[0] == '\0'){
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
383
char *tmp;
384
switch(key){
385
case 'g': /* --global-options */
386
if(arg != NULL){
387
char *plugin_option;
388
while((plugin_option = strsep(&arg, ",")) != NULL){
389
if(plugin_option[0] == '\0'){
346
390
continue;
347
391
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
392
if(not add_argument(getplugin(NULL), plugin_option)){
349
393
perror("add_argument");
350
394
return ARGP_ERR_UNKNOWN;
351
395
}
352
396
}
353
397
}
354
398
break;
355
case 'e':
399
case 'G': /* --global-env */
356
400
if(arg == NULL){
357
401
break;
358
402
}
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
403
if(not add_environment(getplugin(NULL), arg, true)){
404
perror("add_environment");
367
405
}
368
406
break;
369
case 'o':
370
if (arg != NULL){
371
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
373
break;
374
}
375
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
377
break;
378
}
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
407
case 'o': /* --options-for */
408
if(arg != NULL){
409
char *plugin_name = strsep(&arg, ":");
410
if(plugin_name[0] == '\0'){
411
break;
412
}
413
char *plugin_option;
414
while((plugin_option = strsep(&arg, ",")) != NULL){
415
if(not add_argument(getplugin(plugin_name), plugin_option)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
389
418
}
390
419
}
391
420
}
392
421
break;
393
case 'f':
422
case 'E': /* --env-for */
394
423
if(arg == NULL){
395
424
break;
396
425
}
399
428
if(envdef == NULL){
400
429
break;
401
430
}
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
406
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
431
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
408
433
perror("add_environment");
409
434
}
410
435
}
411
436
break;
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
437
case 'd': /* --disable */
438
if(arg != NULL){
439
plugin *p = getplugin(arg);
415
440
if(p == NULL){
416
441
return ARGP_ERR_UNKNOWN;
417
442
}
418
443
p->disabled = true;
419
444
}
420
445
break;
421
case 128:
446
case 'e': /* --enable */
447
if(arg != NULL){
448
plugin *p = getplugin(arg);
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
451
}
452
p->disabled = false;
453
}
454
break;
455
case 128: /* --plugin-dir */
456
free(plugindir);
422
457
plugindir = strdup(arg);
423
458
if(plugindir == NULL){
424
459
perror("strdup");
425
460
}
426
461
break;
427
case 129:
462
case 129: /* --config-file */
463
/* This is already done by parse_opt_config_file() */
464
break;
465
case 130: /* --userid */
466
errno = 0;
467
tmpmax = strtoimax(arg, &tmp, 10);
468
if(errno != 0 or tmp == arg or *tmp != '\0'
469
or tmpmax != (uid_t)tmpmax){
470
fprintf(stderr, "Bad user ID number: \"%s\", using %"
471
PRIdMAX "\n", arg, (intmax_t)uid);
472
} else {
473
uid = (uid_t)tmpmax;
474
}
475
break;
476
case 131: /* --groupid */
477
errno = 0;
478
tmpmax = strtoimax(arg, &tmp, 10);
479
if(errno != 0 or tmp == arg or *tmp != '\0'
480
or tmpmax != (gid_t)tmpmax){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
gid = (gid_t)tmpmax;
485
}
486
break;
487
case 132: /* --debug */
488
debug = true;
489
break;
490
/*
491
* When adding more options before this line, remember to also add a
492
* "case" to the "parse_opt_config_file" function below.
493
*/
494
case ARGP_KEY_ARG:
495
/* Cryptsetup always passes an argument, which is an empty
496
string if "none" was specified in /etc/crypttab. So if
497
argument was empty, we ignore it silently. */
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
500
}
501
break;
502
case ARGP_KEY_END:
503
break;
504
default:
505
return ARGP_ERR_UNKNOWN;
506
}
507
return 0;
508
}
509
510
/* This option parser is the same as parse_opt() above, except it
511
ignores everything but the --config-file option. */
512
error_t parse_opt_config_file(int key, char *arg,
513
__attribute__((unused))
514
struct argp_state *state){
515
switch(key){
516
case 'g': /* --global-options */
517
case 'G': /* --global-env */
518
case 'o': /* --options-for */
519
case 'E': /* --env-for */
520
case 'd': /* --disable */
521
case 'e': /* --enable */
522
case 128: /* --plugin-dir */
523
break;
524
case 129: /* --config-file */
525
free(argfile);
428
526
argfile = strdup(arg);
429
527
if(argfile == NULL){
430
528
perror("strdup");
431
529
}
432
530
break;
433
case 130:
434
uid = (uid_t)strtol(arg, NULL, 10);
435
break;
436
case 131:
437
gid = (gid_t)strtol(arg, NULL, 10);
438
break;
439
case 132:
440
debug = true;
441
break;
531
case 130: /* --userid */
532
case 131: /* --groupid */
533
case 132: /* --debug */
442
534
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
445
535
case ARGP_KEY_END:
446
536
break;
447
537
default:
450
540
return 0;
451
541
}
452
542
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
543
struct argp argp = { .options = options,
544
.parser = parse_opt_config_file,
545
.args_doc = "",
457
546
.doc = "Mandos plugin runner -- Run plugins" };
458
547
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
548
/* Parse using parse_opt_config_file() in order to get the custom
549
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
461
552
fprintf(stderr, "Unknown error while parsing arguments\n");
462
553
exitstatus = EXIT_FAILURE;
463
554
goto fallback;
464
555
}
465
466
if (argfile == NULL){
556
557
/* Reset to the normal argument parser */
558
argp.parser = parse_opt;
559
560
/* Open the configfile if available */
561
if(argfile == NULL){
467
562
conffp = fopen(AFILE, "r");
468
563
} else {
469
564
conffp = fopen(argfile, "r");
470
}
471
565
}
472
566
if(conffp != NULL){
473
567
char *org_line = NULL;
474
568
char *p, *arg, *new_arg, *line;
475
569
size_t size = 0;
476
ssize_t sret;
477
570
const char whitespace_delims[] = " \r\t\f\v\n";
478
571
const char comment_delim[] = "#";
479
572
480
573
custom_argc = 1;
481
574
custom_argv = malloc(sizeof(char*) * 2);
482
575
if(custom_argv == NULL){
487
580
custom_argv[0] = argv[0];
488
581
custom_argv[1] = NULL;
489
582
583
/* for each line in the config file, strip whitespace and ignore
584
commented text */
490
585
while(true){
491
586
sret = getline(&org_line, &size, conffp);
492
587
if(sret == -1){
493
588
break;
494
589
}
495
590
496
591
line = org_line;
497
592
arg = strsep(&line, comment_delim);
498
593
while((p = strsep(&arg, whitespace_delims)) != NULL){
521
616
}
522
617
}
523
618
free(org_line);
524
} else{
619
} else {
525
620
/* Check for harmful errors and go to fallback. Other errors might
526
621
not affect opening plugins */
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
528
623
perror("fopen");
529
624
exitstatus = EXIT_FAILURE;
530
625
goto fallback;
531
626
}
532
627
}
533
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
534
630
if(custom_argv != NULL){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
537
634
fprintf(stderr, "Unknown error while parsing arguments\n");
538
635
exitstatus = EXIT_FAILURE;
539
636
goto fallback;
540
637
}
541
638
}
542
639
640
/* Parse actual command line arguments, to let them override the
641
config file */
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
646
goto fallback;
647
}
648
543
649
if(debug){
544
650
for(plugin *p = plugin_list; p != NULL; p=p->next){
545
651
fprintf(stderr, "Plugin: %s has %d arguments\n",
547
653
for(char **a = p->argv; *a != NULL; a++){
548
654
fprintf(stderr, "\tArg: %s\n", *a);
549
655
}
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
551
657
for(char **a = p->environ; *a != NULL; a++){
552
658
fprintf(stderr, "\t%s\n", *a);
553
659
}
554
660
}
555
661
}
556
662
663
/* Strip permissions down to nobody */
664
setgid(gid);
665
if(ret == -1){
666
perror("setgid");
667
}
557
668
ret = setuid(uid);
558
if (ret == -1){
669
if(ret == -1){
559
670
perror("setuid");
560
671
}
561
672
562
setgid(gid);
563
if (ret == -1){
564
perror("setgid");
565
}
566
567
if (plugindir == NULL){
673
if(plugindir == NULL){
568
674
dir = opendir(PDIR);
569
675
} else {
570
676
dir = opendir(plugindir);
591
697
592
698
FD_ZERO(&rfds_all);
593
699
700
/* Read and execute any executable in the plugin directory*/
594
701
while(true){
595
702
dirst = readdir(dir);
596
703
597
// All directory entries have been processed
704
/* All directory entries have been processed */
598
705
if(dirst == NULL){
599
if (errno == EBADF){
706
if(errno == EBADF){
600
707
perror("readdir");
601
708
exitstatus = EXIT_FAILURE;
602
709
goto fallback;
606
713
607
714
d_name_len = strlen(dirst->d_name);
608
715
609
// Ignore dotfiles, backup files and other junk
716
/* Ignore dotfiles, backup files and other junk */
610
717
{
611
718
bool bad_name = false;
612
719
614
721
615
722
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
616
723
".dpkg-old",
724
".dpkg-bak",
617
725
".dpkg-divert", NULL };
618
726
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
619
727
size_t pre_len = strlen(*pre);
627
735
break;
628
736
}
629
737
}
630
631
738
if(bad_name){
632
739
continue;
633
740
}
634
635
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
636
742
size_t suf_len = strlen(*suf);
637
743
if((d_name_len >= suf_len)
650
756
continue;
651
757
}
652
758
}
653
759
654
760
char *filename;
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
761
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
763
} else {
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
765
}
656
766
if(ret < 0){
657
767
perror("asprintf");
658
768
continue;
659
769
}
660
770
661
771
ret = stat(filename, &st);
662
if (ret == -1){
772
if(ret == -1){
663
773
perror("stat");
664
774
free(filename);
665
775
continue;
666
776
}
667
777
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
778
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
669
780
if(debug){
670
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
671
782
" with bad type or mode\n", filename);
673
784
free(filename);
674
785
continue;
675
786
}
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
787
788
plugin *p = getplugin(dirst->d_name);
677
789
if(p == NULL){
678
790
perror("getplugin");
679
791
free(filename);
689
801
}
690
802
{
691
803
/* Add global arguments to argument list for this plugin */
692
plugin *g = getplugin(NULL, &plugin_list);
804
plugin *g = getplugin(NULL);
693
805
if(g != NULL){
694
806
for(char **a = g->argv + 1; *a != NULL; a++){
695
807
if(not add_argument(p, *a)){
698
810
}
699
811
/* Add global environment variables */
700
812
for(char **e = g->environ; *e != NULL; e++){
701
if(not add_environment(p, *e)){
813
if(not add_environment(p, *e, false)){
702
814
perror("add_environment");
703
815
}
704
816
}
709
821
process, too. */
710
822
if(p->environ[0] != NULL){
711
823
for(char **e = environ; *e != NULL; e++){
712
char *copy = strdup(*e);
713
if(copy == NULL){
714
perror("strdup");
715
continue;
716
}
717
if(not add_environment(p, copy)){
824
if(not add_environment(p, *e, false)){
718
825
perror("add_environment");
719
826
}
720
827
}
722
829
723
830
int pipefd[2];
724
831
ret = pipe(pipefd);
725
if (ret == -1){
832
if(ret == -1){
726
833
perror("pipe");
727
834
exitstatus = EXIT_FAILURE;
728
835
goto fallback;
729
836
}
837
/* Ask OS to automatic close the pipe on exec */
730
838
ret = set_cloexec_flag(pipefd[0]);
731
839
if(ret < 0){
732
840
perror("set_cloexec_flag");
740
848
goto fallback;
741
849
}
742
850
/* Block SIGCHLD until process is safely in process list */
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
744
852
if(ret < 0){
745
853
perror("sigprocmask");
746
854
exitstatus = EXIT_FAILURE;
747
855
goto fallback;
748
856
}
749
// Starting a new process to be watched
857
/* Starting a new process to be watched */
750
858
pid_t pid = fork();
751
859
if(pid == -1){
752
860
perror("fork");
760
868
perror("sigaction");
761
869
_exit(EXIT_FAILURE);
762
870
}
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
764
872
if(ret < 0){
765
873
perror("sigprocmask");
766
874
_exit(EXIT_FAILURE);
767
875
}
768
876
769
877
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
770
878
if(ret == -1){
771
879
perror("dup2");
790
898
}
791
899
/* no return */
792
900
}
793
/* parent process */
901
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
794
903
free(filename);
795
close(pipefd[1]); /* close unused write end of pipe */
796
process *new_process = malloc(sizeof(process));
797
if (new_process == NULL){
798
perror("malloc");
799
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
904
plugin *new_plugin = getplugin(dirst->d_name);
905
if(new_plugin == NULL){
906
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
800
908
if(ret < 0){
801
perror("sigprocmask");
909
perror("sigprocmask");
802
910
}
803
911
exitstatus = EXIT_FAILURE;
804
912
goto fallback;
805
913
}
806
914
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
917
812
918
/* Unblock SIGCHLD so signal handler can be run if this process
813
919
has already completed */
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
815
921
if(ret < 0){
816
922
perror("sigprocmask");
817
923
exitstatus = EXIT_FAILURE;
818
924
goto fallback;
819
925
}
820
926
821
FD_SET(new_process->fd, &rfds_all);
927
FD_SET(new_plugin->fd, &rfds_all);
822
928
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
929
if(maxfd < new_plugin->fd){
930
maxfd = new_plugin->fd;
825
931
}
826
827
932
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
831
933
832
934
closedir(dir);
833
935
dir = NULL;
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
936
free_plugin(getplugin(NULL));
937
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
if(p->pid != 0){
940
break;
941
}
942
if(p->next == NULL){
943
fprintf(stderr, "No plugin processes started. Incorrect plugin"
944
" directory?\n");
945
free_plugin_list();
946
}
839
947
}
840
while(process_list){
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
841
951
fd_set rfds = rfds_all;
842
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
843
if (select_ret == -1){
953
if(select_ret == -1){
844
954
perror("select");
845
955
exitstatus = EXIT_FAILURE;
846
956
goto fallback;
847
957
}
848
958
/* OK, now either a process completed, or something can be read
849
959
from one of them */
850
for(process *proc = process_list; proc ; proc = proc->next){
960
for(plugin *proc = plugin_list; proc != NULL;){
851
961
/* Is this process completely done? */
852
if(proc->eof and proc->completed){
962
if(proc->completed and proc->eof){
853
963
/* Only accept the plugin output if it exited cleanly */
854
964
if(not WIFEXITED(proc->status)
855
965
or WEXITSTATUS(proc->status) != 0){
856
966
/* Bad exit by plugin */
967
857
968
if(debug){
858
969
if(WIFEXITED(proc->status)){
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
970
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
971
" status %d\n", proc->name,
972
(intmax_t) (proc->pid),
861
973
WEXITSTATUS(proc->status));
862
} else if(WIFSIGNALED(proc->status)) {
863
fprintf(stderr, "Plugin %u killed by signal %d\n",
864
(unsigned int) (proc->pid),
974
} else if(WIFSIGNALED(proc->status)){
975
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
976
" signal %d\n", proc->name,
977
(intmax_t) (proc->pid),
865
978
WTERMSIG(proc->status));
866
979
} else if(WCOREDUMP(proc->status)){
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
981
" core\n", proc->name, (intmax_t) (proc->pid));
869
982
}
870
983
}
984
871
985
/* Remove the plugin */
872
986
FD_CLR(proc->fd, &rfds_all);
987
873
988
/* Block signal while modifying process_list */
874
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
875
990
if(ret < 0){
877
992
exitstatus = EXIT_FAILURE;
878
993
goto fallback;
879
994
}
880
/* Delete this process entry from the list */
881
if(process_list == proc){
882
/* First one - simple */
883
process_list = proc->next;
884
} else {
885
/* Second one or later */
886
for(process *p = process_list; p != NULL; p = p->next){
887
if(p->next == proc){
888
p->next = proc->next;
889
break;
890
}
891
}
892
}
995
996
plugin *next_plugin = proc->next;
997
free_plugin(proc);
998
proc = next_plugin;
999
893
1000
/* We are done modifying process list, so unblock signal */
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
896
1003
if(ret < 0){
897
1004
perror("sigprocmask");
898
}
899
free(proc->buffer);
900
free(proc);
901
/* We deleted this process from the list, so we can't go
902
proc->next. Therefore, start over from the beginning of
903
the process list */
904
break;
1005
exitstatus = EXIT_FAILURE;
1006
goto fallback;
1007
}
1008
1009
if(plugin_list == NULL){
1010
break;
1011
}
1012
1013
continue;
905
1014
}
1015
906
1016
/* This process exited nicely, so print its buffer */
907
1017
908
1018
bool bret = print_out_password(proc->buffer,
909
1019
proc->buffer_length);
910
1020
if(not bret){
913
1023
}
914
1024
goto fallback;
915
1025
}
1026
916
1027
/* This process has not completed. Does it have any output? */
917
1028
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
918
1029
/* This process had nothing to say at this time */
1030
proc = proc->next;
919
1031
continue;
920
1032
}
921
1033
/* Before reading, make the process' data buffer large enough */
922
1034
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
923
1035
proc->buffer = realloc(proc->buffer, proc->buffer_size
924
1036
+ (size_t) BUFFER_SIZE);
925
if (proc->buffer == NULL){
1037
if(proc->buffer == NULL){
926
1038
perror("malloc");
927
1039
exitstatus = EXIT_FAILURE;
928
1040
goto fallback;
930
1042
proc->buffer_size += BUFFER_SIZE;
931
1043
}
932
1044
/* Read from the process */
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1047
if(sret < 0){
936
1048
/* Read error from this process; ignore the error */
1049
proc = proc->next;
937
1050
continue;
938
1051
}
939
if(ret == 0){
1052
if(sret == 0){
940
1053
/* got EOF */
941
1054
proc->eof = true;
942
1055
} else {
943
proc->buffer_length += (size_t) ret;
1056
proc->buffer_length += (size_t) sret;
944
1057
}
945
1058
}
946
1059
}
947
948
1060
1061
949
1062
fallback:
950
1063
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
952
1065
/* Fallback if all plugins failed, none are found or an error
953
1066
occured */
954
1067
bool bret;
955
1068
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
956
1069
char *passwordbuffer = getpass("Password: ");
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1070
size_t len = strlen(passwordbuffer);
1071
/* Strip trailing newline */
1072
if(len > 0 and passwordbuffer[len-1] == '\n'){
1073
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1074
len--;
1075
}
1076
bret = print_out_password(passwordbuffer, len);
958
1077
if(not bret){
959
1078
perror("print_out_password");
960
1079
exitstatus = EXIT_FAILURE;
967
1086
perror("sigaction");
968
1087
exitstatus = EXIT_FAILURE;
969
1088
}
970
1089
971
1090
if(custom_argv != NULL){
972
1091
for(char **arg = custom_argv+1; *arg != NULL; arg++){
973
1092
free(*arg);
974
1093
}
975
1094
free(custom_argv);
976
1095
}
977
free_plugin_list(plugin_list);
978
1096
979
1097
if(dir != NULL){
980
1098
closedir(dir);
981
1099
}
982
1100
983
/* Free the process list and kill the processes */
984
for(process *next; process_list != NULL; process_list = next){
985
next = process_list->next;
986
close(process_list->fd);
987
ret = kill(process_list->pid, SIGTERM);
988
if(ret == -1 and errno != ESRCH){
989
/* set-uid proccesses migth not get closed */
990
perror("kill");
1101
/* Kill the processes */
1102
for(plugin *p = plugin_list; p != NULL; p = p->next){
1103
if(p->pid != 0){
1104
close(p->fd);
1105
ret = kill(p->pid, SIGTERM);
1106
if(ret == -1 and errno != ESRCH){
1107
/* Set-uid proccesses might not get closed */
1108
perror("kill");
1109
}
991
1110
}
992
free(process_list->buffer);
993
free(process_list);
994
1111
}
995
1112
996
1113
/* Wait for any remaining child processes to terminate */
1000
1117
if(errno != ECHILD){
1001
1118
perror("wait");
1002
1119
}
1003
1120
1121
free_plugin_list();
1122
1004
1123
free(plugindir);
1005
1124
free(argfile);
1006
1125
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0