To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 87
- compare with another revision
- download diff
- download tarball
- view history from revision 87
- Committer: Teddy Hogeborn
- Date: 2008-08-18 05:24:20 UTC
- Revision ID: teddy@fukt.bsnet.se-20080818052420-ab5eurrioz8n2qy6
* Makefile: Bug fix: fixed creation of man pages in "plugins.d".
* mandos-keygen Bug fix: make the --expire option modify
KEYEXPIRE, not KEYCOMMENT. Use the "--no-options"
option to gpg when exporting keys from the temporary
key ring files.
* mandos-keygen.xml (EXIT STATUS): Filled in.
(ENVIRONMENT): New section, documenting use of TMPDIR.
(FILES): Document use of key files and /tmp.
(BUGS): Filled in.
(EXAMPLE): Added two examples.
(SECURITY): Added some text.
* plugins.d/password-prompt.xml (NOTES): Removed, since this is
created automatically for
footnotes.
(ENVIRONMENT, FILES): Added empty sections.
(EXAMPLES): Renamed to "EXAMPLE", as per man-pages(7).
* plugins.d/password-request.xml: Reordered sections.
(ENVIRONMENT): New empty section.
(EXAMPLES): Renamed to "EXAMPLE", as per man-pages(7).
* mandos-keygen Bug fix: make the --expire option modify
KEYEXPIRE, not KEYCOMMENT. Use the "--no-options"
option to gpg when exporting keys from the temporary
key ring files.
* mandos-keygen.xml (EXIT STATUS): Filled in.
(ENVIRONMENT): New section, documenting use of TMPDIR.
(FILES): Document use of key files and /tmp.
(BUGS): Filled in.
(EXAMPLE): Added two examples.
(SECURITY): Added some text.
* plugins.d/password-prompt.xml (NOTES): Removed, since this is
created automatically for
footnotes.
(ENVIRONMENT, FILES): Added empty sections.
(EXAMPLES): Renamed to "EXAMPLE", as per man-pages(7).
* plugins.d/password-request.xml: Reordered sections.
(ENVIRONMENT): New empty section.
(EXAMPLES): Renamed to "EXAMPLE", as per man-pages(7).
- files removed:
- .bzr-builddeb
- debian
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
56
56
#include <argp.h> /* struct argp_option, struct
57
57
argp_state, struct argp,
58
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
61
60
#include <signal.h> /* struct sigaction, sigemptyset(),
62
61
sigaddset(), sigaction(),
63
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
64
#include <errno.h> /* errno, EBADF */
66
65
67
66
#define BUFFER_SIZE 256
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
68
72
69
const char *argp_program_version = "plugin-runner 1.0";
73
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
71
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
75
86
typedef struct plugin{
76
87
char *name; /* can be NULL or any plugin name */
77
88
char **argv;
79
90
char **environ;
80
91
int envc;
81
92
bool disabled;
82
83
/* Variables used for running processes*/
84
pid_t pid;
85
int fd;
86
char *buffer;
87
size_t buffer_size;
88
size_t buffer_length;
89
bool eof;
90
volatile bool completed;
91
volatile int status;
92
93
struct plugin *next;
93
94
} plugin;
94
95
95
static plugin *plugin_list = NULL;
96
97
/* Gets an existing plugin based on name,
98
or if none is found, creates a new one */
99
static plugin *getplugin(char *name){
100
/* Check for exiting plugin with that name */
101
for (plugin *p = plugin_list; p != NULL; p = p->next){
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
102
98
if ((p->name == name)
103
99
or (p->name and name and (strcmp(p->name, name) == 0))){
104
100
return p;
109
105
if (new_plugin == NULL){
110
106
return NULL;
111
107
}
112
char *copy_name = NULL;
113
if(name != NULL){
114
copy_name = strdup(name);
115
if(copy_name == NULL){
116
return NULL;
117
}
108
char *copy_name = strdup(name);
109
if(copy_name == NULL){
110
return NULL;
118
111
}
119
112
120
113
*new_plugin = (plugin) { .name = copy_name,
121
114
.argc = 1,
115
.envc = 0,
122
116
.disabled = false,
123
.next = plugin_list };
117
.next = *plugin_list };
124
118
125
119
new_plugin->argv = malloc(sizeof(char *) * 2);
126
120
if (new_plugin->argv == NULL){
127
free(copy_name);
128
121
free(new_plugin);
129
122
return NULL;
130
123
}
131
124
new_plugin->argv[0] = copy_name;
132
125
new_plugin->argv[1] = NULL;
133
126
134
127
new_plugin->environ = malloc(sizeof(char *));
135
128
if(new_plugin->environ == NULL){
136
free(copy_name);
137
129
free(new_plugin->argv);
138
130
free(new_plugin);
139
131
return NULL;
140
132
}
141
133
new_plugin->environ[0] = NULL;
142
143
134
/* Append the new plugin to the list */
144
plugin_list = new_plugin;
135
*plugin_list = new_plugin;
145
136
return new_plugin;
146
137
}
147
138
177
168
}
178
169
179
170
/* Add to a plugin's environment */
180
static bool add_environment(plugin *p, const char *def, bool replace){
171
static bool add_environment(plugin *p, const char *def){
181
172
if(p == NULL){
182
173
return false;
183
174
}
184
/* namelen = length of name of environment variable */
185
size_t namelen = (size_t)(strchrnul(def, '=') - def);
186
/* Search for this environment variable */
187
for(char **e = p->environ; *e != NULL; e++){
188
if(strncmp(*e, def, namelen + 1) == 0){
189
/* It already exists */
190
if(replace){
191
char *new = realloc(*e, strlen(def) + 1);
192
if(new == NULL){
193
return false;
194
}
195
*e = new;
196
strcpy(*e, def);
197
}
198
return true;
199
}
200
}
201
175
return add_to_char_array(def, &(p->environ), &(p->envc));
202
176
}
203
177
178
204
179
/*
205
180
* Based on the example in the GNU LibC manual chapter 13.13 "File
206
181
* Descriptor Flags".
207
182
* *Note File Descriptor Flags:(libc)Descriptor Flags.
208
183
*/
209
static int set_cloexec_flag(int fd){
184
static int set_cloexec_flag(int fd)
185
{
210
186
int ret = fcntl(fd, F_GETFD, 0);
211
187
/* If reading the flags failed, return error indication now. */
212
188
if(ret < 0){
216
192
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
217
193
}
218
194
195
process *process_list = NULL;
219
196
220
/* Mark processes as completed when they exit, and save their exit
197
/* Mark a process as completed when it exits, and save its exit
221
198
status. */
222
static void handle_sigchld(__attribute__((unused)) int sig){
223
while(true){
224
plugin *proc = plugin_list;
225
int status;
226
pid_t pid = waitpid(-1, &status, WNOHANG);
227
if(pid == 0){
228
/* Only still running child processes */
229
break;
230
}
231
if(pid == -1){
232
if (errno != ECHILD){
233
perror("waitpid");
234
}
235
/* No child processes */
236
break;
237
}
238
239
/* A child exited, find it in process_list */
240
while(proc != NULL and proc->pid != pid){
241
proc = proc->next;
242
}
243
if(proc == NULL){
244
/* Process not found in process list */
245
continue;
246
}
247
proc->status = status;
248
proc->completed = true;
249
}
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;
250
216
}
251
217
252
/* Prints out a password to stdout */
253
static bool print_out_password(const char *buffer, size_t length){
218
bool print_out_password(const char *buffer, size_t length){
254
219
ssize_t ret;
220
if(length>0 and buffer[length-1] == '\n'){
221
length--;
222
}
255
223
for(size_t written = 0; written < length; written += (size_t)ret){
256
224
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
257
225
length - written));
262
230
return true;
263
231
}
264
232
265
/* Removes and free a plugin from the plugin list */
266
static void free_plugin(plugin *plugin_node){
267
268
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
269
free(*arg);
270
}
271
free(plugin_node->argv);
272
for(char **env = plugin_node->environ; *env != NULL; env++){
273
free(*env);
274
}
275
free(plugin_node->environ);
276
free(plugin_node->buffer);
277
278
/* Removes the plugin from the singly-linked list */
279
if(plugin_node == plugin_list){
280
/* First one - simple */
281
plugin_list = plugin_list->next;
282
} else {
283
/* Second one or later */
284
for(plugin *p = plugin_list; p != NULL; p = p->next){
285
if(p->next == plugin_node){
286
p->next = plugin_node->next;
287
break;
288
}
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;
289
239
}
290
}
291
292
free(plugin_node);
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;
293
252
}
294
253
295
static void free_plugin_list(void){
296
while(plugin_list != NULL){
297
free_plugin(plugin_list);
298
}
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
}
299
268
}
300
269
301
270
int main(int argc, char *argv[]){
302
char *plugindir = NULL;
303
char *argfile = NULL;
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
304
273
FILE *conffp;
305
274
size_t d_name_len;
306
275
DIR *dir = NULL;
329
298
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
330
299
if(ret == -1){
331
300
perror("sigaction");
332
exitstatus = EXIT_FAILURE;
301
exitstatus = EXIT_FAILURE;
333
302
goto fallback;
334
303
}
335
304
338
307
{ .name = "global-options", .key = 'g',
339
308
.arg = "OPTION[,OPTION[,...]]",
340
309
.doc = "Options passed to all plugins" },
341
{ .name = "global-env", .key = 'G',
310
{ .name = "global-envs", .key = 'e',
342
311
.arg = "VAR=value",
343
312
.doc = "Environment variable passed to all plugins" },
344
313
{ .name = "options-for", .key = 'o',
345
314
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
346
315
.doc = "Options passed only to specified plugin" },
347
{ .name = "env-for", .key = 'E',
316
{ .name = "envs-for", .key = 'f',
348
317
.arg = "PLUGIN:ENV=value",
349
318
.doc = "Environment variable passed to specified plugin" },
350
319
{ .name = "disable", .key = 'd',
351
320
.arg = "PLUGIN",
352
321
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
354
.arg = "PLUGIN",
355
.doc = "Enable a specific plugin", .group = 1 },
356
322
{ .name = "plugin-dir", .key = 128,
357
323
.arg = "DIRECTORY",
358
324
.doc = "Specify a different plugin directory", .group = 2 },
359
{ .name = "config-file", .key = 129,
360
.arg = "FILE",
361
.doc = "Specify a different configuration file", .group = 2 },
362
{ .name = "userid", .key = 130,
363
.arg = "ID", .flags = 0,
364
.doc = "User ID the plugins will run as", .group = 3 },
365
{ .name = "groupid", .key = 131,
366
.arg = "ID", .flags = 0,
367
.doc = "Group ID the plugins will run as", .group = 3 },
368
{ .name = "debug", .key = 132,
369
.doc = "Debug mode", .group = 4 },
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 },
370
333
{ .name = NULL }
371
334
};
372
335
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
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;
375
340
switch (key) {
376
case 'g': /* --global-options */
341
case 'g':
377
342
if (arg != NULL){
378
343
char *p;
379
344
while((p = strsep(&arg, ",")) != NULL){
380
345
if(p[0] == '\0'){
381
346
continue;
382
347
}
383
if(not add_argument(getplugin(NULL), p)){
348
if(not add_argument(getplugin(NULL, plugins), p)){
384
349
perror("add_argument");
385
350
return ARGP_ERR_UNKNOWN;
386
351
}
387
352
}
388
353
}
389
354
break;
390
case 'G': /* --global-env */
355
case 'e':
391
356
if(arg == NULL){
392
357
break;
393
358
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
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
}
396
367
}
397
368
break;
398
case 'o': /* --options-for */
369
case 'o':
399
370
if (arg != NULL){
400
371
char *p_name = strsep(&arg, ":");
401
if(p_name[0] == '\0' or arg == NULL){
372
if(p_name[0] == '\0'){
402
373
break;
403
374
}
404
375
char *opt = strsep(&arg, ":");
405
if(opt[0] == '\0' or opt == NULL){
376
if(opt[0] == '\0'){
406
377
break;
407
378
}
408
char *p;
409
while((p = strsep(&opt, ",")) != NULL){
410
if(p[0] == '\0'){
411
continue;
412
}
413
if(not add_argument(getplugin(p_name), p)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
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
}
416
389
}
417
390
}
418
391
}
419
392
break;
420
case 'E': /* --env-for */
393
case 'f':
421
394
if(arg == NULL){
422
395
break;
423
396
}
426
399
if(envdef == NULL){
427
400
break;
428
401
}
429
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
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
408
perror("add_environment");
432
409
}
433
410
}
434
411
break;
435
case 'd': /* --disable */
412
case 'd':
436
413
if (arg != NULL){
437
plugin *p = getplugin(arg);
414
plugin *p = getplugin(arg, plugins);
438
415
if(p == NULL){
439
416
return ARGP_ERR_UNKNOWN;
440
417
}
441
418
p->disabled = true;
442
419
}
443
420
break;
444
case 'e': /* --enable */
445
if (arg != NULL){
446
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
449
}
450
p->disabled = false;
451
}
452
break;
453
case 128: /* --plugin-dir */
454
free(plugindir);
455
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
459
break;
460
case 129: /* --config-file */
461
/* This is already done by parse_opt_config_file() */
462
break;
463
case 130: /* --userid */
421
case 128:
422
plugindir = arg;
423
break;
424
case 129:
464
425
uid = (uid_t)strtol(arg, NULL, 10);
465
426
break;
466
case 131: /* --groupid */
427
case 130:
467
428
gid = (gid_t)strtol(arg, NULL, 10);
468
429
break;
469
case 132: /* --debug */
430
case 131:
470
431
debug = true;
471
432
break;
472
433
case ARGP_KEY_ARG:
473
/* Cryptsetup always passes an argument, which is an empty
474
string if "none" was specified in /etc/crypttab. So if
475
argument was empty, we ignore it silently. */
476
if(arg[0] != '\0'){
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
478
}
479
break;
480
case ARGP_KEY_END:
481
break;
482
default:
483
return ARGP_ERR_UNKNOWN;
484
}
485
return 0;
486
}
487
488
/* This option parser is the same as parse_opt() above, except it
489
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
494
case 'g': /* --global-options */
495
case 'G': /* --global-env */
496
case 'o': /* --options-for */
497
case 'E': /* --env-for */
498
case 'd': /* --disable */
499
case 'e': /* --enable */
500
case 128: /* --plugin-dir */
501
break;
502
case 129: /* --config-file */
503
free(argfile);
504
argfile = strdup(arg);
505
if(argfile == NULL){
506
perror("strdup");
507
}
508
break;
509
case 130: /* --userid */
510
case 131: /* --groupid */
511
case 132: /* --debug */
512
case ARGP_KEY_ARG:
513
case ARGP_KEY_END:
514
break;
515
default:
516
return ARGP_ERR_UNKNOWN;
517
}
518
return 0;
519
}
520
521
struct argp argp = { .options = options,
522
.parser = parse_opt_config_file,
523
.args_doc = "",
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]",
524
448
.doc = "Mandos plugin runner -- Run plugins" };
525
449
526
/* Parse using the parse_opt_config_file in order to get the custom
527
config file location, if any. */
528
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
529
451
if (ret == ARGP_ERR_UNKNOWN){
530
452
fprintf(stderr, "Unknown error while parsing arguments\n");
531
453
exitstatus = EXIT_FAILURE;
532
454
goto fallback;
533
455
}
534
535
/* Reset to the normal argument parser */
536
argp.parser = parse_opt;
537
538
/* Open the configfile if available */
539
if (argfile == NULL){
540
conffp = fopen(AFILE, "r");
541
} else {
542
conffp = fopen(argfile, "r");
543
}
456
457
conffp = fopen(argfile, "r");
544
458
if(conffp != NULL){
545
459
char *org_line = NULL;
546
460
char *p, *arg, *new_arg, *line;
549
463
const char whitespace_delims[] = " \r\t\f\v\n";
550
464
const char comment_delim[] = "#";
551
465
552
custom_argc = 1;
553
custom_argv = malloc(sizeof(char*) * 2);
554
if(custom_argv == NULL){
555
perror("malloc");
556
exitstatus = EXIT_FAILURE;
557
goto fallback;
558
}
559
custom_argv[0] = argv[0];
560
custom_argv[1] = NULL;
561
562
/* for each line in the config file, strip whitespace and ignore
563
commented text */
564
466
while(true){
565
467
sret = getline(&org_line, &size, conffp);
566
468
if(sret == -1){
574
476
continue;
575
477
}
576
478
new_arg = strdup(p);
577
if(new_arg == NULL){
578
perror("strdup");
579
exitstatus = EXIT_FAILURE;
580
free(org_line);
581
goto fallback;
582
}
583
584
custom_argc += 1;
585
custom_argv = realloc(custom_argv, sizeof(char *)
586
* ((unsigned int) custom_argc + 1));
587
if(custom_argv == NULL){
588
perror("realloc");
589
exitstatus = EXIT_FAILURE;
590
free(org_line);
591
goto fallback;
592
}
593
custom_argv[custom_argc-1] = new_arg;
594
custom_argv[custom_argc] = NULL;
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
}
595
485
}
596
486
}
597
487
free(org_line);
598
} else {
488
} else{
599
489
/* Check for harmful errors and go to fallback. Other errors might
600
490
not affect opening plugins */
601
491
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
604
494
goto fallback;
605
495
}
606
496
}
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
497
609
498
if(custom_argv != NULL){
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
499
custom_argv[0] = argv[0];
500
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
612
501
if (ret == ARGP_ERR_UNKNOWN){
613
502
fprintf(stderr, "Unknown error while parsing arguments\n");
614
503
exitstatus = EXIT_FAILURE;
616
505
}
617
506
}
618
507
619
/* Parse actual command line arguments, to let them override the
620
config file */
621
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
622
if (ret == ARGP_ERR_UNKNOWN){
623
fprintf(stderr, "Unknown error while parsing arguments\n");
624
exitstatus = EXIT_FAILURE;
625
goto fallback;
626
}
627
628
508
if(debug){
629
509
for(plugin *p = plugin_list; p != NULL; p=p->next){
630
510
fprintf(stderr, "Plugin: %s has %d arguments\n",
639
519
}
640
520
}
641
521
642
/* Strip permissions down to nobody */
643
522
ret = setuid(uid);
644
523
if (ret == -1){
645
524
perror("setuid");
646
}
525
}
526
647
527
setgid(gid);
648
528
if (ret == -1){
649
529
perror("setgid");
650
530
}
651
531
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
532
dir = opendir(plugindir);
658
533
if(dir == NULL){
659
534
perror("Could not open plugin dir");
660
535
exitstatus = EXIT_FAILURE;
676
551
677
552
FD_ZERO(&rfds_all);
678
553
679
/* Read and execute any executable in the plugin directory*/
680
554
while(true){
681
555
dirst = readdir(dir);
682
556
683
/* All directory entries have been processed */
557
// All directory entries have been processed
684
558
if(dirst == NULL){
685
559
if (errno == EBADF){
686
560
perror("readdir");
692
566
693
567
d_name_len = strlen(dirst->d_name);
694
568
695
/* Ignore dotfiles, backup files and other junk */
569
// Ignore dotfiles, backup files and other junk
696
570
{
697
571
bool bad_name = false;
698
572
713
587
break;
714
588
}
715
589
}
590
716
591
if(bad_name){
717
592
continue;
718
593
}
594
719
595
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
720
596
size_t suf_len = strlen(*suf);
721
597
if((d_name_len >= suf_len)
736
612
}
737
613
738
614
char *filename;
739
if(plugindir == NULL){
740
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
741
} else {
742
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
743
}
615
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
744
616
if(ret < 0){
745
617
perror("asprintf");
746
618
continue;
752
624
free(filename);
753
625
continue;
754
626
}
755
756
/* Ignore non-executable files */
627
757
628
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
758
629
if(debug){
759
630
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
633
free(filename);
763
634
continue;
764
635
}
765
766
plugin *p = getplugin(dirst->d_name);
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
767
637
if(p == NULL){
768
638
perror("getplugin");
769
639
free(filename);
779
649
}
780
650
{
781
651
/* Add global arguments to argument list for this plugin */
782
plugin *g = getplugin(NULL);
652
plugin *g = getplugin(NULL, &plugin_list);
783
653
if(g != NULL){
784
654
for(char **a = g->argv + 1; *a != NULL; a++){
785
655
if(not add_argument(p, *a)){
788
658
}
789
659
/* Add global environment variables */
790
660
for(char **e = g->environ; *e != NULL; e++){
791
if(not add_environment(p, *e, false)){
661
if(not add_environment(p, *e)){
792
662
perror("add_environment");
793
663
}
794
664
}
799
669
process, too. */
800
670
if(p->environ[0] != NULL){
801
671
for(char **e = environ; *e != NULL; e++){
802
if(not add_environment(p, *e, false)){
672
char *copy = strdup(*e);
673
if(copy == NULL){
674
perror("strdup");
675
continue;
676
}
677
if(not add_environment(p, copy)){
803
678
perror("add_environment");
804
679
}
805
680
}
806
681
}
807
682
808
int pipefd[2];
683
int pipefd[2];
809
684
ret = pipe(pipefd);
810
685
if (ret == -1){
811
686
perror("pipe");
812
687
exitstatus = EXIT_FAILURE;
813
688
goto fallback;
814
689
}
815
/* Ask OS to automatic close the pipe on exec */
816
690
ret = set_cloexec_flag(pipefd[0]);
817
691
if(ret < 0){
818
692
perror("set_cloexec_flag");
832
706
exitstatus = EXIT_FAILURE;
833
707
goto fallback;
834
708
}
835
/* Starting a new process to be watched */
709
// Starting a new process to be watched
836
710
pid_t pid = fork();
837
711
if(pid == -1){
838
712
perror("fork");
876
750
}
877
751
/* no return */
878
752
}
879
/* Parent process */
880
close(pipefd[1]); /* Close unused write end of pipe */
753
/* parent process */
881
754
free(filename);
882
plugin *new_plugin = getplugin(dirst->d_name);
883
if (new_plugin == NULL){
884
perror("getplugin");
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");
885
759
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
886
760
if(ret < 0){
887
perror("sigprocmask");
761
perror("sigprocmask");
888
762
}
889
763
exitstatus = EXIT_FAILURE;
890
764
goto fallback;
891
765
}
892
766
893
new_plugin->pid = pid;
894
new_plugin->fd = pipefd[0];
895
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
process_list = new_process;
896
772
/* Unblock SIGCHLD so signal handler can be run if this process
897
773
has already completed */
898
774
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
902
778
goto fallback;
903
779
}
904
780
905
FD_SET(new_plugin->fd, &rfds_all);
781
FD_SET(new_process->fd, &rfds_all);
906
782
907
if (maxfd < new_plugin->fd){
908
maxfd = new_plugin->fd;
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
909
785
}
910
786
911
787
}
912
788
789
free_plugin_list(plugin_list);
790
913
791
closedir(dir);
914
792
dir = NULL;
915
916
for(plugin *p = plugin_list; p != NULL; p = p->next){
917
if(p->pid != 0){
918
break;
919
}
920
if(p->next == NULL){
921
fprintf(stderr, "No plugin processes started. Incorrect plugin"
922
" directory?\n");
923
free_plugin_list();
924
}
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
process_list = NULL;
925
798
}
926
927
/* Main loop while running plugins exist */
928
while(plugin_list){
799
while(process_list){
929
800
fd_set rfds = rfds_all;
930
801
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
931
802
if (select_ret == -1){
935
806
}
936
807
/* OK, now either a process completed, or something can be read
937
808
from one of them */
938
for(plugin *proc = plugin_list; proc != NULL;){
809
for(process *proc = process_list; proc ; proc = proc->next){
939
810
/* Is this process completely done? */
940
811
if(proc->eof and proc->completed){
941
812
/* Only accept the plugin output if it exited cleanly */
942
813
if(not WIFEXITED(proc->status)
943
814
or WEXITSTATUS(proc->status) != 0){
944
815
/* Bad exit by plugin */
945
946
816
if(debug){
947
817
if(WIFEXITED(proc->status)){
948
818
fprintf(stderr, "Plugin %u exited with status %d\n",
957
827
(unsigned int) (proc->pid));
958
828
}
959
829
}
960
961
830
/* Remove the plugin */
962
831
FD_CLR(proc->fd, &rfds_all);
963
964
832
/* Block signal while modifying process_list */
965
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
966
834
if(ret < 0){
967
835
perror("sigprocmask");
968
836
exitstatus = EXIT_FAILURE;
969
837
goto fallback;
970
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
852
/* We are done modifying process list, so unblock signal */
973
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
974
854
NULL);
975
855
if(ret < 0){
976
856
perror("sigprocmask");
977
exitstatus = EXIT_FAILURE;
978
goto fallback;
979
}
980
981
if(plugin_list == NULL){
982
break;
983
}
984
985
plugin *next_plugin = proc->next;
986
free_plugin(proc);
987
proc = next_plugin;
988
continue;
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;
989
864
}
990
991
865
/* This process exited nicely, so print its buffer */
992
866
993
bool bret = print_out_password(proc->buffer,
994
proc->buffer_length);
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
995
868
if(not bret){
996
869
perror("print_out_password");
997
870
exitstatus = EXIT_FAILURE;
998
871
}
999
872
goto fallback;
1000
873
}
1001
1002
874
/* This process has not completed. Does it have any output? */
1003
875
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1004
876
/* This process had nothing to say at this time */
1005
proc = proc->next;
1006
877
continue;
1007
878
}
1008
879
/* Before reading, make the process' data buffer large enough */
1021
892
BUFFER_SIZE);
1022
893
if(ret < 0){
1023
894
/* Read error from this process; ignore the error */
1024
proc = proc->next;
1025
895
continue;
1026
896
}
1027
897
if(ret == 0){
1036
906
1037
907
fallback:
1038
908
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1040
/* Fallback if all plugins failed, none are found or an error
1041
occured */
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1042
911
bool bret;
1043
912
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1044
913
char *passwordbuffer = getpass("Password: ");
1045
size_t len = strlen(passwordbuffer);
1046
/* Strip trailing newline */
1047
if(len > 0 and passwordbuffer[len-1] == '\n'){
1048
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1049
len--;
1050
}
1051
bret = print_out_password(passwordbuffer, len);
914
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1052
915
if(not bret){
1053
916
perror("print_out_password");
1054
917
exitstatus = EXIT_FAILURE;
1063
926
}
1064
927
1065
928
if(custom_argv != NULL){
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1067
930
free(*arg);
1068
931
}
1069
932
free(custom_argv);
1070
933
}
934
free_plugin_list(plugin_list);
1071
935
1072
936
if(dir != NULL){
1073
937
closedir(dir);
1074
938
}
1075
939
1076
940
/* Free the process list and kill the processes */
1077
for(plugin *p = plugin_list; p != NULL; p = p->next){
1078
if(p->pid != 0){
1079
close(p->fd);
1080
ret = kill(p->pid, SIGTERM);
1081
if(ret == -1 and errno != ESRCH){
1082
/* Set-uid proccesses might not get closed */
1083
perror("kill");
1084
}
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");
1085
948
}
949
free(process_list->buffer);
950
free(process_list);
1086
951
}
1087
952
1088
953
/* Wait for any remaining child processes to terminate */
1092
957
if(errno != ECHILD){
1093
958
perror("wait");
1094
959
}
1095
1096
free_plugin_list();
1097
1098
free(plugindir);
1099
free(argfile);
1100
960
1101
961
return exitstatus;
1102
962
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0