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 239
- compare with another revision
- download diff
- download tarball
- view history from revision 239
- Committer: Teddy Hogeborn
- Date: 2009-01-06 00:58:17 UTC
- Revision ID: teddy@fukt.bsnet.se-20090106005817-lnxyism0yjkmmlj1
Tags: version-1.0.3-1
* Makefile (version): Changed to "1.0.3".
* NEWS (Version 1.0.3): New entry.
* debian/changelog (1.0.3-1): New entry.
* NEWS (Version 1.0.3): New entry.
* debian/changelog (1.0.3-1): New entry.
- 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,
56
57
#include <argp.h> /* struct argp_option, struct
57
58
argp_state, struct argp,
58
59
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
60
62
#include <signal.h> /* struct sigaction, sigemptyset(),
61
63
sigaddset(), sigaction(),
62
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
66
#include <errno.h> /* errno, EBADF */
65
67
66
68
#define BUFFER_SIZE 256
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
69
70
#define PDIR "/lib/mandos/plugins.d"
71
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
73
const char *argp_program_version = "plugin-runner " VERSION;
70
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
75
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
86
76
typedef struct plugin{
87
77
char *name; /* can be NULL or any plugin name */
88
78
char **argv;
90
80
char **environ;
91
81
int envc;
92
82
bool disabled;
83
84
/* Variables used for running processes*/
85
pid_t pid;
86
int fd;
87
char *buffer;
88
size_t buffer_size;
89
size_t buffer_length;
90
bool eof;
91
volatile bool completed;
92
volatile int status;
93
93
struct plugin *next;
94
94
} plugin;
95
95
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
static plugin *plugin_list = NULL;
97
98
/* Gets an existing plugin based on name,
99
or if none is found, creates a new one */
100
static plugin *getplugin(char *name){
101
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
98
103
if ((p->name == name)
99
104
or (p->name and name and (strcmp(p->name, name) == 0))){
100
105
return p;
105
110
if (new_plugin == NULL){
106
111
return NULL;
107
112
}
108
char *copy_name = strdup(name);
109
if(copy_name == NULL){
110
return NULL;
113
char *copy_name = NULL;
114
if(name != NULL){
115
copy_name = strdup(name);
116
if(copy_name == NULL){
117
return NULL;
118
}
111
119
}
112
120
113
121
*new_plugin = (plugin) { .name = copy_name,
114
122
.argc = 1,
115
.envc = 0,
116
123
.disabled = false,
117
.next = *plugin_list };
124
.next = plugin_list };
118
125
119
126
new_plugin->argv = malloc(sizeof(char *) * 2);
120
127
if (new_plugin->argv == NULL){
128
free(copy_name);
121
129
free(new_plugin);
122
130
return NULL;
123
131
}
124
132
new_plugin->argv[0] = copy_name;
125
133
new_plugin->argv[1] = NULL;
126
134
127
135
new_plugin->environ = malloc(sizeof(char *));
128
136
if(new_plugin->environ == NULL){
137
free(copy_name);
129
138
free(new_plugin->argv);
130
139
free(new_plugin);
131
140
return NULL;
132
141
}
133
142
new_plugin->environ[0] = NULL;
143
134
144
/* Append the new plugin to the list */
135
*plugin_list = new_plugin;
145
plugin_list = new_plugin;
136
146
return new_plugin;
137
147
}
138
148
168
178
}
169
179
170
180
/* Add to a plugin's environment */
171
static bool add_environment(plugin *p, const char *def){
181
static bool add_environment(plugin *p, const char *def, bool replace){
172
182
if(p == NULL){
173
183
return false;
174
184
}
185
/* namelen = length of name of environment variable */
186
size_t namelen = (size_t)(strchrnul(def, '=') - def);
187
/* Search for this environment variable */
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
190
/* It already exists */
191
if(replace){
192
char *new = realloc(*e, strlen(def) + 1);
193
if(new == NULL){
194
return false;
195
}
196
*e = new;
197
strcpy(*e, def);
198
}
199
return true;
200
}
201
}
175
202
return add_to_char_array(def, &(p->environ), &(p->envc));
176
203
}
177
204
178
179
205
/*
180
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
181
207
* Descriptor Flags".
182
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
183
209
*/
184
static int set_cloexec_flag(int fd)
185
{
210
static int set_cloexec_flag(int fd){
186
211
int ret = fcntl(fd, F_GETFD, 0);
187
212
/* If reading the flags failed, return error indication now. */
188
213
if(ret < 0){
192
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
193
218
}
194
219
195
process *process_list = NULL;
196
220
197
/* Mark a process as completed when it exits, and save its exit
221
/* Mark processes as completed when they exit, and save their exit
198
222
status. */
199
void handle_sigchld(__attribute__((unused)) int sig){
200
process *proc = process_list;
201
int status;
202
pid_t pid = wait(&status);
203
if(pid == -1){
204
perror("wait");
205
return;
206
}
207
while(proc != NULL and proc->pid != pid){
208
proc = proc->next;
209
}
210
if(proc == NULL){
211
/* Process not found in process list */
212
return;
213
}
214
proc->status = status;
215
proc->completed = true;
223
static void handle_sigchld(__attribute__((unused)) int sig){
224
while(true){
225
plugin *proc = plugin_list;
226
int status;
227
pid_t pid = waitpid(-1, &status, WNOHANG);
228
if(pid == 0){
229
/* Only still running child processes */
230
break;
231
}
232
if(pid == -1){
233
if (errno != ECHILD){
234
perror("waitpid");
235
}
236
/* No child processes */
237
break;
238
}
239
240
/* A child exited, find it in process_list */
241
while(proc != NULL and proc->pid != pid){
242
proc = proc->next;
243
}
244
if(proc == NULL){
245
/* Process not found in process list */
246
continue;
247
}
248
proc->status = status;
249
proc->completed = true;
250
}
216
251
}
217
252
218
bool print_out_password(const char *buffer, size_t length){
253
/* Prints out a password to stdout */
254
static bool print_out_password(const char *buffer, size_t length){
219
255
ssize_t ret;
220
if(length>0 and buffer[length-1] == '\n'){
221
length--;
222
}
223
256
for(size_t written = 0; written < length; written += (size_t)ret){
224
257
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
225
258
length - written));
230
263
return true;
231
264
}
232
265
233
char **add_to_argv(char **argv, int *argc, char *arg){
234
if (argv == NULL){
235
*argc = 1;
236
argv = malloc(sizeof(char*) * 2);
237
if(argv == NULL){
238
return NULL;
266
/* Removes and free a plugin from the plugin list */
267
static void free_plugin(plugin *plugin_node){
268
269
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
270
free(*arg);
271
}
272
free(plugin_node->argv);
273
for(char **env = plugin_node->environ; *env != NULL; env++){
274
free(*env);
275
}
276
free(plugin_node->environ);
277
free(plugin_node->buffer);
278
279
/* Removes the plugin from the singly-linked list */
280
if(plugin_node == plugin_list){
281
/* First one - simple */
282
plugin_list = plugin_list->next;
283
} else {
284
/* Second one or later */
285
for(plugin *p = plugin_list; p != NULL; p = p->next){
286
if(p->next == plugin_node){
287
p->next = plugin_node->next;
288
break;
289
}
239
290
}
240
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
241
argv[1] = NULL;
242
}
243
*argc += 1;
244
argv = realloc(argv, sizeof(char *)
245
* ((unsigned int) *argc + 1));
246
if(argv == NULL){
247
return NULL;
248
}
249
argv[*argc-1] = arg;
250
argv[*argc] = NULL;
251
return argv;
291
}
292
293
free(plugin_node);
252
294
}
253
295
254
static void free_plugin_list(plugin *plugin_list){
255
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
256
next = plugin_list->next;
257
free(plugin_list->name);
258
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
259
free(*arg);
260
}
261
free(plugin_list->argv);
262
for(char **env = plugin_list->environ; *env != NULL; env++){
263
free(*env);
264
}
265
free(plugin_list->environ);
266
free(plugin_list);
267
}
296
static void free_plugin_list(void){
297
while(plugin_list != NULL){
298
free_plugin(plugin_list);
299
}
268
300
}
269
301
270
302
int main(int argc, char *argv[]){
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
303
char *plugindir = NULL;
304
char *argfile = NULL;
273
305
FILE *conffp;
274
306
size_t d_name_len;
275
307
DIR *dir = NULL;
298
330
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
299
331
if(ret == -1){
300
332
perror("sigaction");
301
exitstatus = EXIT_FAILURE;
333
exitstatus = EXIT_FAILURE;
302
334
goto fallback;
303
335
}
304
336
307
339
{ .name = "global-options", .key = 'g',
308
340
.arg = "OPTION[,OPTION[,...]]",
309
341
.doc = "Options passed to all plugins" },
310
{ .name = "global-envs", .key = 'e',
342
{ .name = "global-env", .key = 'G',
311
343
.arg = "VAR=value",
312
344
.doc = "Environment variable passed to all plugins" },
313
345
{ .name = "options-for", .key = 'o',
314
346
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
315
347
.doc = "Options passed only to specified plugin" },
316
{ .name = "envs-for", .key = 'f',
348
{ .name = "env-for", .key = 'E',
317
349
.arg = "PLUGIN:ENV=value",
318
350
.doc = "Environment variable passed to specified plugin" },
319
351
{ .name = "disable", .key = 'd',
320
352
.arg = "PLUGIN",
321
353
.doc = "Disable a specific plugin", .group = 1 },
354
{ .name = "enable", .key = 'e',
355
.arg = "PLUGIN",
356
.doc = "Enable a specific plugin", .group = 1 },
322
357
{ .name = "plugin-dir", .key = 128,
323
358
.arg = "DIRECTORY",
324
359
.doc = "Specify a different plugin directory", .group = 2 },
325
{ .name = "userid", .key = 129,
326
.arg = "ID", .flags = 0,
327
.doc = "User ID the plugins will run as", .group = 2 },
328
{ .name = "groupid", .key = 130,
329
.arg = "ID", .flags = 0,
330
.doc = "Group ID the plugins will run as", .group = 2 },
331
{ .name = "debug", .key = 131,
332
.doc = "Debug mode", .group = 3 },
360
{ .name = "config-file", .key = 129,
361
.arg = "FILE",
362
.doc = "Specify a different configuration file", .group = 2 },
363
{ .name = "userid", .key = 130,
364
.arg = "ID", .flags = 0,
365
.doc = "User ID the plugins will run as", .group = 3 },
366
{ .name = "groupid", .key = 131,
367
.arg = "ID", .flags = 0,
368
.doc = "Group ID the plugins will run as", .group = 3 },
369
{ .name = "debug", .key = 132,
370
.doc = "Debug mode", .group = 4 },
333
371
{ .name = NULL }
334
372
};
335
373
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;
374
error_t parse_opt (int key, char *arg, __attribute__((unused))
375
struct argp_state *state) {
340
376
switch (key) {
341
case 'g':
377
case 'g': /* --global-options */
342
378
if (arg != NULL){
343
379
char *p;
344
380
while((p = strsep(&arg, ",")) != NULL){
345
381
if(p[0] == '\0'){
346
382
continue;
347
383
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
384
if(not add_argument(getplugin(NULL), p)){
349
385
perror("add_argument");
350
386
return ARGP_ERR_UNKNOWN;
351
387
}
352
388
}
353
389
}
354
390
break;
355
case 'e':
391
case 'G': /* --global-env */
356
392
if(arg == NULL){
357
393
break;
358
394
}
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
}
395
if(not add_environment(getplugin(NULL), arg, true)){
396
perror("add_environment");
367
397
}
368
398
break;
369
case 'o':
399
case 'o': /* --options-for */
370
400
if (arg != NULL){
371
401
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
402
if(p_name[0] == '\0' or arg == NULL){
373
403
break;
374
404
}
375
405
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
406
if(opt[0] == '\0' or opt == NULL){
377
407
break;
378
408
}
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
}
409
char *p;
410
while((p = strsep(&opt, ",")) != NULL){
411
if(p[0] == '\0'){
412
continue;
413
}
414
if(not add_argument(getplugin(p_name), p)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
389
417
}
390
418
}
391
419
}
392
420
break;
393
case 'f':
421
case 'E': /* --env-for */
394
422
if(arg == NULL){
395
423
break;
396
424
}
399
427
if(envdef == NULL){
400
428
break;
401
429
}
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)){
430
*envdef = '\0';
431
if(not add_environment(getplugin(arg), envdef+1, true)){
408
432
perror("add_environment");
409
433
}
410
434
}
411
435
break;
412
case 'd':
436
case 'd': /* --disable */
413
437
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
438
plugin *p = getplugin(arg);
415
439
if(p == NULL){
416
440
return ARGP_ERR_UNKNOWN;
417
441
}
418
442
p->disabled = true;
419
443
}
420
444
break;
421
case 128:
422
plugindir = arg;
423
break;
424
case 129:
445
case 'e': /* --enable */
446
if (arg != NULL){
447
plugin *p = getplugin(arg);
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
450
}
451
p->disabled = false;
452
}
453
break;
454
case 128: /* --plugin-dir */
455
free(plugindir);
456
plugindir = strdup(arg);
457
if(plugindir == NULL){
458
perror("strdup");
459
}
460
break;
461
case 129: /* --config-file */
462
/* This is already done by parse_opt_config_file() */
463
break;
464
case 130: /* --userid */
425
465
uid = (uid_t)strtol(arg, NULL, 10);
426
466
break;
427
case 130:
467
case 131: /* --groupid */
428
468
gid = (gid_t)strtol(arg, NULL, 10);
429
469
break;
430
case 131:
470
case 132: /* --debug */
431
471
debug = true;
432
472
break;
433
473
case ARGP_KEY_ARG:
434
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
435
break;
436
case ARGP_KEY_END:
437
break;
438
default:
439
return ARGP_ERR_UNKNOWN;
440
}
441
return 0;
442
}
443
444
plugin *plugin_list = NULL;
445
446
struct argp argp = { .options = options, .parser = parse_opt,
447
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
474
/* Cryptsetup always passes an argument, which is an empty
475
string if "none" was specified in /etc/crypttab. So if
476
argument was empty, we ignore it silently. */
477
if(arg[0] != '\0'){
478
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
479
}
480
break;
481
case ARGP_KEY_END:
482
break;
483
default:
484
return ARGP_ERR_UNKNOWN;
485
}
486
return 0;
487
}
488
489
/* This option parser is the same as parse_opt() above, except it
490
ignores everything but the --config-file option. */
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
494
switch (key) {
495
case 'g': /* --global-options */
496
case 'G': /* --global-env */
497
case 'o': /* --options-for */
498
case 'E': /* --env-for */
499
case 'd': /* --disable */
500
case 'e': /* --enable */
501
case 128: /* --plugin-dir */
502
break;
503
case 129: /* --config-file */
504
free(argfile);
505
argfile = strdup(arg);
506
if(argfile == NULL){
507
perror("strdup");
508
}
509
break;
510
case 130: /* --userid */
511
case 131: /* --groupid */
512
case 132: /* --debug */
513
case ARGP_KEY_ARG:
514
case ARGP_KEY_END:
515
break;
516
default:
517
return ARGP_ERR_UNKNOWN;
518
}
519
return 0;
520
}
521
522
struct argp argp = { .options = options,
523
.parser = parse_opt_config_file,
524
.args_doc = "",
448
525
.doc = "Mandos plugin runner -- Run plugins" };
449
526
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
527
/* Parse using the parse_opt_config_file in order to get the custom
528
config file location, if any. */
529
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
451
530
if (ret == ARGP_ERR_UNKNOWN){
452
531
fprintf(stderr, "Unknown error while parsing arguments\n");
453
532
exitstatus = EXIT_FAILURE;
454
533
goto fallback;
455
534
}
456
457
conffp = fopen(argfile, "r");
535
536
/* Reset to the normal argument parser */
537
argp.parser = parse_opt;
538
539
/* Open the configfile if available */
540
if (argfile == NULL){
541
conffp = fopen(AFILE, "r");
542
} else {
543
conffp = fopen(argfile, "r");
544
}
458
545
if(conffp != NULL){
459
546
char *org_line = NULL;
460
547
char *p, *arg, *new_arg, *line;
463
550
const char whitespace_delims[] = " \r\t\f\v\n";
464
551
const char comment_delim[] = "#";
465
552
553
custom_argc = 1;
554
custom_argv = malloc(sizeof(char*) * 2);
555
if(custom_argv == NULL){
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
558
goto fallback;
559
}
560
custom_argv[0] = argv[0];
561
custom_argv[1] = NULL;
562
563
/* for each line in the config file, strip whitespace and ignore
564
commented text */
466
565
while(true){
467
566
sret = getline(&org_line, &size, conffp);
468
567
if(sret == -1){
476
575
continue;
477
576
}
478
577
new_arg = strdup(p);
479
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
480
if (custom_argv == NULL){
481
perror("add_to_argv");
482
exitstatus = EXIT_FAILURE;
483
goto fallback;
484
}
578
if(new_arg == NULL){
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
581
free(org_line);
582
goto fallback;
583
}
584
585
custom_argc += 1;
586
custom_argv = realloc(custom_argv, sizeof(char *)
587
* ((unsigned int) custom_argc + 1));
588
if(custom_argv == NULL){
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
591
free(org_line);
592
goto fallback;
593
}
594
custom_argv[custom_argc-1] = new_arg;
595
custom_argv[custom_argc] = NULL;
485
596
}
486
597
}
487
598
free(org_line);
488
} else{
599
} else {
489
600
/* Check for harmful errors and go to fallback. Other errors might
490
601
not affect opening plugins */
491
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
494
605
goto fallback;
495
606
}
496
607
}
497
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
498
610
if(custom_argv != NULL){
499
custom_argv[0] = argv[0];
500
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
501
613
if (ret == ARGP_ERR_UNKNOWN){
502
614
fprintf(stderr, "Unknown error while parsing arguments\n");
503
615
exitstatus = EXIT_FAILURE;
505
617
}
506
618
}
507
619
620
/* Parse actual command line arguments, to let them override the
621
config file */
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
627
}
628
508
629
if(debug){
509
630
for(plugin *p = plugin_list; p != NULL; p=p->next){
510
631
fprintf(stderr, "Plugin: %s has %d arguments\n",
519
640
}
520
641
}
521
642
643
/* Strip permissions down to nobody */
522
644
ret = setuid(uid);
523
645
if (ret == -1){
524
646
perror("setuid");
525
}
526
647
}
527
648
setgid(gid);
528
649
if (ret == -1){
529
650
perror("setgid");
530
651
}
531
652
532
dir = opendir(plugindir);
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
533
659
if(dir == NULL){
534
660
perror("Could not open plugin dir");
535
661
exitstatus = EXIT_FAILURE;
551
677
552
678
FD_ZERO(&rfds_all);
553
679
680
/* Read and execute any executable in the plugin directory*/
554
681
while(true){
555
682
dirst = readdir(dir);
556
683
557
// All directory entries have been processed
684
/* All directory entries have been processed */
558
685
if(dirst == NULL){
559
686
if (errno == EBADF){
560
687
perror("readdir");
566
693
567
694
d_name_len = strlen(dirst->d_name);
568
695
569
// Ignore dotfiles, backup files and other junk
696
/* Ignore dotfiles, backup files and other junk */
570
697
{
571
698
bool bad_name = false;
572
699
574
701
575
702
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
576
703
".dpkg-old",
704
".dpkg-bak",
577
705
".dpkg-divert", NULL };
578
706
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
579
707
size_t pre_len = strlen(*pre);
587
715
break;
588
716
}
589
717
}
590
591
718
if(bad_name){
592
719
continue;
593
720
}
594
595
721
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
596
722
size_t suf_len = strlen(*suf);
597
723
if((d_name_len >= suf_len)
612
738
}
613
739
614
740
char *filename;
615
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
741
if(plugindir == NULL){
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
743
} else {
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
745
}
616
746
if(ret < 0){
617
747
perror("asprintf");
618
748
continue;
624
754
free(filename);
625
755
continue;
626
756
}
627
757
758
/* Ignore non-executable files */
628
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
629
760
if(debug){
630
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
633
764
free(filename);
634
765
continue;
635
766
}
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
767
768
plugin *p = getplugin(dirst->d_name);
637
769
if(p == NULL){
638
770
perror("getplugin");
639
771
free(filename);
649
781
}
650
782
{
651
783
/* Add global arguments to argument list for this plugin */
652
plugin *g = getplugin(NULL, &plugin_list);
784
plugin *g = getplugin(NULL);
653
785
if(g != NULL){
654
786
for(char **a = g->argv + 1; *a != NULL; a++){
655
787
if(not add_argument(p, *a)){
658
790
}
659
791
/* Add global environment variables */
660
792
for(char **e = g->environ; *e != NULL; e++){
661
if(not add_environment(p, *e)){
793
if(not add_environment(p, *e, false)){
662
794
perror("add_environment");
663
795
}
664
796
}
669
801
process, too. */
670
802
if(p->environ[0] != NULL){
671
803
for(char **e = environ; *e != NULL; e++){
672
char *copy = strdup(*e);
673
if(copy == NULL){
674
perror("strdup");
675
continue;
676
}
677
if(not add_environment(p, copy)){
804
if(not add_environment(p, *e, false)){
678
805
perror("add_environment");
679
806
}
680
807
}
681
808
}
682
809
683
int pipefd[2];
810
int pipefd[2];
684
811
ret = pipe(pipefd);
685
812
if (ret == -1){
686
813
perror("pipe");
687
814
exitstatus = EXIT_FAILURE;
688
815
goto fallback;
689
816
}
817
/* Ask OS to automatic close the pipe on exec */
690
818
ret = set_cloexec_flag(pipefd[0]);
691
819
if(ret < 0){
692
820
perror("set_cloexec_flag");
706
834
exitstatus = EXIT_FAILURE;
707
835
goto fallback;
708
836
}
709
// Starting a new process to be watched
837
/* Starting a new process to be watched */
710
838
pid_t pid = fork();
711
839
if(pid == -1){
712
840
perror("fork");
720
848
perror("sigaction");
721
849
_exit(EXIT_FAILURE);
722
850
}
723
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
724
852
if(ret < 0){
725
853
perror("sigprocmask");
726
854
_exit(EXIT_FAILURE);
727
855
}
728
856
729
857
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
730
858
if(ret == -1){
731
859
perror("dup2");
750
878
}
751
879
/* no return */
752
880
}
753
/* parent process */
881
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
754
883
free(filename);
755
close(pipefd[1]); /* close unused write end of pipe */
756
process *new_process = malloc(sizeof(process));
757
if (new_process == NULL){
758
perror("malloc");
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
759
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
760
888
if(ret < 0){
761
perror("sigprocmask");
889
perror("sigprocmask");
762
890
}
763
891
exitstatus = EXIT_FAILURE;
764
892
goto fallback;
765
893
}
766
894
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
process_list = new_process;
895
new_plugin->pid = pid;
896
new_plugin->fd = pipefd[0];
897
772
898
/* Unblock SIGCHLD so signal handler can be run if this process
773
899
has already completed */
774
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
778
904
goto fallback;
779
905
}
780
906
781
FD_SET(new_process->fd, &rfds_all);
907
FD_SET(new_plugin->fd, &rfds_all);
782
908
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
909
if (maxfd < new_plugin->fd){
910
maxfd = new_plugin->fd;
785
911
}
786
787
912
}
788
913
789
free_plugin_list(plugin_list);
790
791
914
closedir(dir);
792
915
dir = NULL;
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
process_list = NULL;
916
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
918
if(p->pid != 0){
919
break;
920
}
921
if(p->next == NULL){
922
fprintf(stderr, "No plugin processes started. Incorrect plugin"
923
" directory?\n");
924
free_plugin_list();
925
}
798
926
}
799
while(process_list){
927
928
/* Main loop while running plugins exist */
929
while(plugin_list){
800
930
fd_set rfds = rfds_all;
801
931
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
802
932
if (select_ret == -1){
806
936
}
807
937
/* OK, now either a process completed, or something can be read
808
938
from one of them */
809
for(process *proc = process_list; proc ; proc = proc->next){
939
for(plugin *proc = plugin_list; proc != NULL;){
810
940
/* Is this process completely done? */
811
941
if(proc->eof and proc->completed){
812
942
/* Only accept the plugin output if it exited cleanly */
813
943
if(not WIFEXITED(proc->status)
814
944
or WEXITSTATUS(proc->status) != 0){
815
945
/* Bad exit by plugin */
946
816
947
if(debug){
817
948
if(WIFEXITED(proc->status)){
818
949
fprintf(stderr, "Plugin %u exited with status %d\n",
827
958
(unsigned int) (proc->pid));
828
959
}
829
960
}
961
830
962
/* Remove the plugin */
831
963
FD_CLR(proc->fd, &rfds_all);
964
832
965
/* Block signal while modifying process_list */
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
834
967
if(ret < 0){
835
968
perror("sigprocmask");
836
969
exitstatus = EXIT_FAILURE;
837
970
goto fallback;
838
971
}
839
/* Delete this process entry from the list */
840
if(process_list == proc){
841
/* First one - simple */
842
process_list = proc->next;
843
} else {
844
/* Second one or later */
845
for(process *p = process_list; p != NULL; p = p->next){
846
if(p->next == proc){
847
p->next = proc->next;
848
break;
849
}
850
}
851
}
972
973
plugin *next_plugin = proc->next;
974
free_plugin(proc);
975
proc = next_plugin;
976
852
977
/* We are done modifying process list, so unblock signal */
853
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
854
979
NULL);
855
980
if(ret < 0){
856
981
perror("sigprocmask");
857
}
858
free(proc->buffer);
859
free(proc);
860
/* We deleted this process from the list, so we can't go
861
proc->next. Therefore, start over from the beginning of
862
the process list */
863
break;
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
990
continue;
864
991
}
992
865
993
/* This process exited nicely, so print its buffer */
866
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
994
995
bool bret = print_out_password(proc->buffer,
996
proc->buffer_length);
868
997
if(not bret){
869
998
perror("print_out_password");
870
999
exitstatus = EXIT_FAILURE;
871
1000
}
872
1001
goto fallback;
873
1002
}
1003
874
1004
/* This process has not completed. Does it have any output? */
875
1005
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
876
1006
/* This process had nothing to say at this time */
1007
proc = proc->next;
877
1008
continue;
878
1009
}
879
1010
/* Before reading, make the process' data buffer large enough */
892
1023
BUFFER_SIZE);
893
1024
if(ret < 0){
894
1025
/* Read error from this process; ignore the error */
1026
proc = proc->next;
895
1027
continue;
896
1028
}
897
1029
if(ret == 0){
906
1038
907
1039
fallback:
908
1040
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1042
/* Fallback if all plugins failed, none are found or an error
1043
occured */
911
1044
bool bret;
912
1045
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
913
1046
char *passwordbuffer = getpass("Password: ");
914
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1047
size_t len = strlen(passwordbuffer);
1048
/* Strip trailing newline */
1049
if(len > 0 and passwordbuffer[len-1] == '\n'){
1050
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1051
len--;
1052
}
1053
bret = print_out_password(passwordbuffer, len);
915
1054
if(not bret){
916
1055
perror("print_out_password");
917
1056
exitstatus = EXIT_FAILURE;
924
1063
perror("sigaction");
925
1064
exitstatus = EXIT_FAILURE;
926
1065
}
927
1066
928
1067
if(custom_argv != NULL){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1068
for(char **arg = custom_argv+1; *arg != NULL; arg++){
930
1069
free(*arg);
931
1070
}
932
1071
free(custom_argv);
933
1072
}
934
free_plugin_list(plugin_list);
935
1073
936
1074
if(dir != NULL){
937
1075
closedir(dir);
938
1076
}
939
1077
940
/* Free the process list and kill the processes */
941
for(process *next; process_list != NULL; process_list = next){
942
next = process_list->next;
943
close(process_list->fd);
944
ret = kill(process_list->pid, SIGTERM);
945
if(ret == -1 and errno != ESRCH){
946
/* set-uid proccesses migth not get closed */
947
perror("kill");
1078
/* Kill the processes */
1079
for(plugin *p = plugin_list; p != NULL; p = p->next){
1080
if(p->pid != 0){
1081
close(p->fd);
1082
ret = kill(p->pid, SIGTERM);
1083
if(ret == -1 and errno != ESRCH){
1084
/* Set-uid proccesses might not get closed */
1085
perror("kill");
1086
}
948
1087
}
949
free(process_list->buffer);
950
free(process_list);
951
1088
}
952
1089
953
1090
/* Wait for any remaining child processes to terminate */
958
1095
perror("wait");
959
1096
}
960
1097
1098
free_plugin_list();
1099
1100
free(plugindir);
1101
free(argfile);
1102
961
1103
return exitstatus;
962
1104
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0