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- Committer: Björn Påhlsson
- Date: 2008-08-16 17:11:35 UTC
- mfrom: (79 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 80.
- Revision ID: belorn@braxen-20080816171135-w1v8mrtsxs0ghfa6
merge
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
6
*
7
7
* This program is free software: you can redistribute it and/or
8
8
* modify it under the terms of the GNU General Public License as
27
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
28
EXIT_SUCCESS, realloc() */
29
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, fileno(), fprintf(),
31
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
33
stat, waitpid(), WIFEXITED(),
34
34
WEXITSTATUS(), wait(), pid_t,
46
46
fcntl(), setuid(), setgid(),
47
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
48
access(), pipe(), fork(), close()
49
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
50
50
execv(), write(), read(),
51
51
close() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
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
}
118
}
119
120
*new_plugin = (plugin) { .name = copy_name,
108
*new_plugin = (plugin) { .name = name,
121
109
.argc = 1,
110
.envc = 0,
122
111
.disabled = false,
123
.next = plugin_list };
112
.next = *plugin_list };
124
113
125
114
new_plugin->argv = malloc(sizeof(char *) * 2);
126
115
if (new_plugin->argv == NULL){
127
free(copy_name);
128
116
free(new_plugin);
129
117
return NULL;
130
118
}
131
new_plugin->argv[0] = copy_name;
119
new_plugin->argv[0] = name;
132
120
new_plugin->argv[1] = NULL;
133
121
134
122
new_plugin->environ = malloc(sizeof(char *));
135
123
if(new_plugin->environ == NULL){
136
free(copy_name);
137
124
free(new_plugin->argv);
138
125
free(new_plugin);
139
126
return NULL;
140
127
}
141
128
new_plugin->environ[0] = NULL;
142
143
129
/* Append the new plugin to the list */
144
plugin_list = new_plugin;
130
*plugin_list = new_plugin;
145
131
return new_plugin;
146
132
}
147
133
177
163
}
178
164
179
165
/* Add to a plugin's environment */
180
static bool add_environment(plugin *p, const char *def, bool replace){
166
static bool add_environment(plugin *p, const char *def){
181
167
if(p == NULL){
182
168
return false;
183
169
}
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
170
return add_to_char_array(def, &(p->environ), &(p->envc));
202
171
}
203
172
173
204
174
/*
205
175
* Based on the example in the GNU LibC manual chapter 13.13 "File
206
176
* Descriptor Flags".
207
177
* *Note File Descriptor Flags:(libc)Descriptor Flags.
208
178
*/
209
static int set_cloexec_flag(int fd){
179
static int set_cloexec_flag(int fd)
180
{
210
181
int ret = fcntl(fd, F_GETFD, 0);
211
182
/* If reading the flags failed, return error indication now. */
212
183
if(ret < 0){
216
187
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
217
188
}
218
189
190
process *process_list = NULL;
219
191
220
/* Mark processes as completed when they exit, and save their exit
192
/* Mark a process as completed when it exits, and save its exit
221
193
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
}
194
void handle_sigchld(__attribute__((unused)) int sig){
195
process *proc = process_list;
196
int status;
197
pid_t pid = wait(&status);
198
if(pid == -1){
199
perror("wait");
200
return;
201
}
202
while(proc != NULL and proc->pid != pid){
203
proc = proc->next;
204
}
205
if(proc == NULL){
206
/* Process not found in process list */
207
return;
208
}
209
proc->status = status;
210
proc->completed = true;
250
211
}
251
212
252
/* Prints out a password to stdout */
253
static bool print_out_password(const char *buffer, size_t length){
213
bool print_out_password(const char *buffer, size_t length){
254
214
ssize_t ret;
215
if(length>0 and buffer[length-1] == '\n'){
216
length--;
217
}
255
218
for(size_t written = 0; written < length; written += (size_t)ret){
256
219
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
257
220
length - written));
262
225
return true;
263
226
}
264
227
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
}
228
char **add_to_argv(char **argv, int *argc, char *arg){
229
if (argv == NULL){
230
*argc = 1;
231
argv = malloc(sizeof(char*) * 2);
232
if(argv == NULL){
233
return NULL;
289
234
}
290
}
291
292
free(plugin_node);
293
}
294
295
static void free_plugin_list(void){
296
while(plugin_list != NULL){
297
free_plugin(plugin_list);
298
}
235
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
236
argv[1] = NULL;
237
}
238
*argc += 1;
239
argv = realloc(argv, sizeof(char *)
240
* ((unsigned int) *argc + 1));
241
if(argv == NULL){
242
return NULL;
243
}
244
argv[*argc-1] = arg;
245
argv[*argc] = NULL;
246
return argv;
299
247
}
300
248
301
249
int main(int argc, char *argv[]){
302
char *plugindir = NULL;
303
char *argfile = NULL;
250
const char *plugindir = "/lib/mandos/plugins.d";
251
const char *argfile = ARGFILE;
304
252
FILE *conffp;
305
253
size_t d_name_len;
306
254
DIR *dir = NULL;
321
269
/* Establish a signal handler */
322
270
sigemptyset(&sigchld_action.sa_mask);
323
271
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
324
if(ret == -1){
272
if(ret < 0){
325
273
perror("sigaddset");
326
exitstatus = EXIT_FAILURE;
327
goto fallback;
274
exit(EXIT_FAILURE);
328
275
}
329
276
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
330
if(ret == -1){
277
if(ret < 0){
331
278
perror("sigaction");
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
279
exit(EXIT_FAILURE);
334
280
}
335
281
336
282
/* The options we understand. */
338
284
{ .name = "global-options", .key = 'g',
339
285
.arg = "OPTION[,OPTION[,...]]",
340
286
.doc = "Options passed to all plugins" },
341
{ .name = "global-env", .key = 'G',
287
{ .name = "global-envs", .key = 'e',
342
288
.arg = "VAR=value",
343
289
.doc = "Environment variable passed to all plugins" },
344
290
{ .name = "options-for", .key = 'o',
345
291
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
346
292
.doc = "Options passed only to specified plugin" },
347
{ .name = "env-for", .key = 'E',
293
{ .name = "envs-for", .key = 'f',
348
294
.arg = "PLUGIN:ENV=value",
349
295
.doc = "Environment variable passed to specified plugin" },
350
296
{ .name = "disable", .key = 'd',
351
297
.arg = "PLUGIN",
352
298
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
354
.arg = "PLUGIN",
355
.doc = "Enable a specific plugin", .group = 1 },
356
299
{ .name = "plugin-dir", .key = 128,
357
300
.arg = "DIRECTORY",
358
301
.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 },
302
{ .name = "userid", .key = 129,
303
.arg = "ID", .flags = 0,
304
.doc = "User ID the plugins will run as", .group = 2 },
305
{ .name = "groupid", .key = 130,
306
.arg = "ID", .flags = 0,
307
.doc = "Group ID the plugins will run as", .group = 2 },
308
{ .name = "debug", .key = 131,
309
.doc = "Debug mode", .group = 3 },
370
310
{ .name = NULL }
371
311
};
372
312
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
313
error_t parse_opt (int key, char *arg, struct argp_state *state) {
314
/* Get the INPUT argument from `argp_parse', which we know is a
315
pointer to our plugin list pointer. */
316
plugin **plugins = state->input;
375
317
switch (key) {
376
case 'g': /* --global-options */
318
case 'g':
377
319
if (arg != NULL){
378
320
char *p;
379
321
while((p = strsep(&arg, ",")) != NULL){
380
322
if(p[0] == '\0'){
381
323
continue;
382
324
}
383
if(not add_argument(getplugin(NULL), p)){
325
if(not add_argument(getplugin(NULL, plugins), p)){
384
326
perror("add_argument");
385
327
return ARGP_ERR_UNKNOWN;
386
328
}
387
329
}
388
330
}
389
331
break;
390
case 'G': /* --global-env */
332
case 'e':
391
333
if(arg == NULL){
392
334
break;
393
335
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
336
{
337
char *envdef = strdup(arg);
338
if(envdef == NULL){
339
break;
340
}
341
if(not add_environment(getplugin(NULL, plugins), envdef)){
342
perror("add_environment");
343
}
396
344
}
397
345
break;
398
case 'o': /* --options-for */
346
case 'o':
399
347
if (arg != NULL){
400
348
char *p_name = strsep(&arg, ":");
401
if(p_name[0] == '\0' or arg == NULL){
349
if(p_name[0] == '\0'){
402
350
break;
403
351
}
404
352
char *opt = strsep(&arg, ":");
405
if(opt[0] == '\0' or opt == NULL){
353
if(opt[0] == '\0'){
406
354
break;
407
355
}
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;
356
if(opt != NULL){
357
char *p;
358
while((p = strsep(&opt, ",")) != NULL){
359
if(p[0] == '\0'){
360
continue;
361
}
362
if(not add_argument(getplugin(p_name, plugins), p)){
363
perror("add_argument");
364
return ARGP_ERR_UNKNOWN;
365
}
416
366
}
417
367
}
418
368
}
419
369
break;
420
case 'E': /* --env-for */
370
case 'f':
421
371
if(arg == NULL){
422
372
break;
423
373
}
426
376
if(envdef == NULL){
427
377
break;
428
378
}
429
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
379
char *p_name = strndup(arg, (size_t) (envdef-arg));
380
if(p_name == NULL){
381
break;
382
}
383
envdef++;
384
if(not add_environment(getplugin(p_name, plugins), envdef)){
431
385
perror("add_environment");
432
386
}
433
387
}
434
388
break;
435
case 'd': /* --disable */
389
case 'd':
436
390
if (arg != NULL){
437
plugin *p = getplugin(arg);
391
plugin *p = getplugin(arg, plugins);
438
392
if(p == NULL){
439
393
return ARGP_ERR_UNKNOWN;
440
394
}
441
395
p->disabled = true;
442
396
}
443
397
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 */
398
case 128:
399
plugindir = arg;
400
break;
401
case 129:
464
402
uid = (uid_t)strtol(arg, NULL, 10);
465
403
break;
466
case 131: /* --groupid */
404
case 130:
467
405
gid = (gid_t)strtol(arg, NULL, 10);
468
406
break;
469
case 132: /* --debug */
407
case 131:
470
408
debug = true;
471
409
break;
472
410
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 = "",
411
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
412
break;
413
case ARGP_KEY_END:
414
break;
415
default:
416
return ARGP_ERR_UNKNOWN;
417
}
418
return 0;
419
}
420
421
plugin *plugin_list = NULL;
422
423
struct argp argp = { .options = options, .parser = parse_opt,
424
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
524
425
.doc = "Mandos plugin runner -- Run plugins" };
525
426
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);
427
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
529
428
if (ret == ARGP_ERR_UNKNOWN){
530
429
fprintf(stderr, "Unknown error while parsing arguments\n");
531
430
exitstatus = EXIT_FAILURE;
532
goto fallback;
431
goto end;
533
432
}
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
}
433
434
conffp = fopen(argfile, "r");
544
435
if(conffp != NULL){
545
436
char *org_line = NULL;
546
char *p, *arg, *new_arg, *line;
547
437
size_t size = 0;
548
438
ssize_t sret;
439
char *p, *arg, *new_arg, *line;
549
440
const char whitespace_delims[] = " \r\t\f\v\n";
550
441
const char comment_delim[] = "#";
551
442
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
443
while(true){
565
444
sret = getline(&org_line, &size, conffp);
566
445
if(sret == -1){
574
453
continue;
575
454
}
576
455
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;
456
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
457
if (custom_argv == NULL){
458
perror("add_to_argv");
459
exitstatus = EXIT_FAILURE;
460
goto end;
461
}
595
462
}
596
463
}
597
464
free(org_line);
598
} else {
465
} else{
599
466
/* Check for harmful errors and go to fallback. Other errors might
600
467
not affect opening plugins */
601
468
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
602
469
perror("fopen");
603
470
exitstatus = EXIT_FAILURE;
604
goto fallback;
471
goto end;
605
472
}
606
473
}
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
474
609
475
if(custom_argv != NULL){
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
476
custom_argv[0] = argv[0];
477
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
612
478
if (ret == ARGP_ERR_UNKNOWN){
613
479
fprintf(stderr, "Unknown error while parsing arguments\n");
614
480
exitstatus = EXIT_FAILURE;
615
goto fallback;
481
goto end;
616
482
}
617
483
}
618
484
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
485
if(debug){
629
486
for(plugin *p = plugin_list; p != NULL; p=p->next){
630
487
fprintf(stderr, "Plugin: %s has %d arguments\n",
639
496
}
640
497
}
641
498
642
/* Strip permissions down to nobody */
643
499
ret = setuid(uid);
644
500
if (ret == -1){
645
501
perror("setuid");
646
}
502
}
503
647
504
setgid(gid);
648
505
if (ret == -1){
649
506
perror("setgid");
650
507
}
651
508
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
509
dir = opendir(plugindir);
658
510
if(dir == NULL){
659
511
perror("Could not open plugin dir");
660
512
exitstatus = EXIT_FAILURE;
661
goto fallback;
513
goto end;
662
514
}
663
515
664
516
/* Set the FD_CLOEXEC flag on the directory, if possible */
669
521
if(ret < 0){
670
522
perror("set_cloexec_flag");
671
523
exitstatus = EXIT_FAILURE;
672
goto fallback;
524
goto end;
673
525
}
674
526
}
675
527
}
676
528
677
529
FD_ZERO(&rfds_all);
678
530
679
/* Read and execute any executable in the plugin directory*/
680
531
while(true){
681
532
dirst = readdir(dir);
682
533
683
/* All directory entries have been processed */
534
// All directory entries have been processed
684
535
if(dirst == NULL){
685
536
if (errno == EBADF){
686
537
perror("readdir");
687
538
exitstatus = EXIT_FAILURE;
688
goto fallback;
539
goto end;
689
540
}
690
541
break;
691
542
}
692
543
693
544
d_name_len = strlen(dirst->d_name);
694
545
695
/* Ignore dotfiles, backup files and other junk */
546
// Ignore dotfiles, backup files and other junk
696
547
{
697
548
bool bad_name = false;
698
549
713
564
break;
714
565
}
715
566
}
567
716
568
if(bad_name){
717
569
continue;
718
570
}
571
719
572
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
720
573
size_t suf_len = strlen(*suf);
721
574
if((d_name_len >= suf_len)
736
589
}
737
590
738
591
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
}
592
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
744
593
if(ret < 0){
745
594
perror("asprintf");
746
595
continue;
752
601
free(filename);
753
602
continue;
754
603
}
755
756
/* Ignore non-executable files */
604
757
605
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
758
606
if(debug){
759
607
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
610
free(filename);
763
611
continue;
764
612
}
765
766
plugin *p = getplugin(dirst->d_name);
613
plugin *p = getplugin(dirst->d_name, &plugin_list);
767
614
if(p == NULL){
768
615
perror("getplugin");
769
616
free(filename);
779
626
}
780
627
{
781
628
/* Add global arguments to argument list for this plugin */
782
plugin *g = getplugin(NULL);
629
plugin *g = getplugin(NULL, &plugin_list);
783
630
if(g != NULL){
784
631
for(char **a = g->argv + 1; *a != NULL; a++){
785
632
if(not add_argument(p, *a)){
788
635
}
789
636
/* Add global environment variables */
790
637
for(char **e = g->environ; *e != NULL; e++){
791
if(not add_environment(p, *e, false)){
638
if(not add_environment(p, *e)){
792
639
perror("add_environment");
793
640
}
794
641
}
799
646
process, too. */
800
647
if(p->environ[0] != NULL){
801
648
for(char **e = environ; *e != NULL; e++){
802
if(not add_environment(p, *e, false)){
649
char *copy = strdup(*e);
650
if(copy == NULL){
651
perror("strdup");
652
continue;
653
}
654
if(not add_environment(p, copy)){
803
655
perror("add_environment");
804
656
}
805
657
}
806
658
}
807
659
808
int pipefd[2];
660
int pipefd[2];
809
661
ret = pipe(pipefd);
810
662
if (ret == -1){
811
663
perror("pipe");
812
664
exitstatus = EXIT_FAILURE;
813
goto fallback;
665
goto end;
814
666
}
815
/* Ask OS to automatic close the pipe on exec */
816
667
ret = set_cloexec_flag(pipefd[0]);
817
668
if(ret < 0){
818
669
perror("set_cloexec_flag");
819
670
exitstatus = EXIT_FAILURE;
820
goto fallback;
671
goto end;
821
672
}
822
673
ret = set_cloexec_flag(pipefd[1]);
823
674
if(ret < 0){
824
675
perror("set_cloexec_flag");
825
676
exitstatus = EXIT_FAILURE;
826
goto fallback;
677
goto end;
827
678
}
828
679
/* Block SIGCHLD until process is safely in process list */
829
680
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
830
681
if(ret < 0){
831
682
perror("sigprocmask");
832
683
exitstatus = EXIT_FAILURE;
833
goto fallback;
684
goto end;
834
685
}
835
/* Starting a new process to be watched */
686
// Starting a new process to be watched
836
687
pid_t pid = fork();
837
688
if(pid == -1){
838
689
perror("fork");
839
690
exitstatus = EXIT_FAILURE;
840
goto fallback;
691
goto end;
841
692
}
842
693
if(pid == 0){
843
694
/* this is the child process */
876
727
}
877
728
/* no return */
878
729
}
879
/* Parent process */
880
close(pipefd[1]); /* Close unused write end of pipe */
730
/* parent process */
881
731
free(filename);
882
plugin *new_plugin = getplugin(dirst->d_name);
883
if (new_plugin == NULL){
884
perror("getplugin");
732
close(pipefd[1]); /* close unused write end of pipe */
733
process *new_process = malloc(sizeof(process));
734
if (new_process == NULL){
735
perror("malloc");
885
736
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
886
737
if(ret < 0){
887
perror("sigprocmask");
738
perror("sigprocmask");
888
739
}
889
740
exitstatus = EXIT_FAILURE;
890
goto fallback;
741
goto end;
891
742
}
892
743
893
new_plugin->pid = pid;
894
new_plugin->fd = pipefd[0];
895
744
*new_process = (struct process){ .pid = pid,
745
.fd = pipefd[0],
746
.next = process_list };
747
// List handling
748
process_list = new_process;
896
749
/* Unblock SIGCHLD so signal handler can be run if this process
897
750
has already completed */
898
751
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
899
752
if(ret < 0){
900
753
perror("sigprocmask");
901
754
exitstatus = EXIT_FAILURE;
902
goto fallback;
903
}
904
905
FD_SET(new_plugin->fd, &rfds_all);
906
907
if (maxfd < new_plugin->fd){
908
maxfd = new_plugin->fd;
909
}
910
755
goto end;
756
}
757
758
FD_SET(new_process->fd, &rfds_all);
759
760
if (maxfd < new_process->fd){
761
maxfd = new_process->fd;
762
}
763
764
}
765
766
/* Free the plugin list */
767
for(plugin *next; plugin_list != NULL; plugin_list = next){
768
next = plugin_list->next;
769
free(plugin_list->argv);
770
if(plugin_list->environ[0] != NULL){
771
for(char **e = plugin_list->environ; *e != NULL; e++){
772
free(*e);
773
}
774
}
775
free(plugin_list);
911
776
}
912
777
913
778
closedir(dir);
914
779
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
}
780
781
if (process_list == NULL){
782
fprintf(stderr, "No plugin processes started. Incorrect plugin"
783
" directory?\n");
784
process_list = NULL;
925
785
}
926
927
/* Main loop while running plugins exist */
928
while(plugin_list){
786
while(process_list){
929
787
fd_set rfds = rfds_all;
930
788
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
931
789
if (select_ret == -1){
932
790
perror("select");
933
791
exitstatus = EXIT_FAILURE;
934
goto fallback;
792
goto end;
935
793
}
936
794
/* OK, now either a process completed, or something can be read
937
795
from one of them */
938
for(plugin *proc = plugin_list; proc != NULL;){
796
for(process *proc = process_list; proc ; proc = proc->next){
939
797
/* Is this process completely done? */
940
798
if(proc->eof and proc->completed){
941
799
/* Only accept the plugin output if it exited cleanly */
942
800
if(not WIFEXITED(proc->status)
943
801
or WEXITSTATUS(proc->status) != 0){
944
802
/* Bad exit by plugin */
945
946
803
if(debug){
947
804
if(WIFEXITED(proc->status)){
948
805
fprintf(stderr, "Plugin %u exited with status %d\n",
957
814
(unsigned int) (proc->pid));
958
815
}
959
816
}
960
961
817
/* Remove the plugin */
962
818
FD_CLR(proc->fd, &rfds_all);
963
964
819
/* Block signal while modifying process_list */
965
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
820
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
966
821
if(ret < 0){
967
822
perror("sigprocmask");
968
823
exitstatus = EXIT_FAILURE;
969
goto fallback;
970
}
971
824
goto end;
825
}
826
/* Delete this process entry from the list */
827
if(process_list == proc){
828
/* First one - simple */
829
process_list = proc->next;
830
} else {
831
/* Second one or later */
832
for(process *p = process_list; p != NULL; p = p->next){
833
if(p->next == proc){
834
p->next = proc->next;
835
break;
836
}
837
}
838
}
972
839
/* We are done modifying process list, so unblock signal */
973
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
974
841
NULL);
975
842
if(ret < 0){
976
843
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;
844
}
845
free(proc->buffer);
846
free(proc);
847
/* We deleted this process from the list, so we can't go
848
proc->next. Therefore, start over from the beginning of
849
the process list */
850
break;
989
851
}
990
991
852
/* This process exited nicely, so print its buffer */
992
853
993
bool bret = print_out_password(proc->buffer,
994
proc->buffer_length);
854
bool bret = print_out_password(proc->buffer, proc->buffer_length);
995
855
if(not bret){
996
856
perror("print_out_password");
997
857
exitstatus = EXIT_FAILURE;
998
858
}
999
goto fallback;
859
goto end;
1000
860
}
1001
1002
861
/* This process has not completed. Does it have any output? */
1003
862
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1004
863
/* This process had nothing to say at this time */
1005
proc = proc->next;
1006
864
continue;
1007
865
}
1008
866
/* Before reading, make the process' data buffer large enough */
1012
870
if (proc->buffer == NULL){
1013
871
perror("malloc");
1014
872
exitstatus = EXIT_FAILURE;
1015
goto fallback;
873
goto end;
1016
874
}
1017
875
proc->buffer_size += BUFFER_SIZE;
1018
876
}
1021
879
BUFFER_SIZE);
1022
880
if(ret < 0){
1023
881
/* Read error from this process; ignore the error */
1024
proc = proc->next;
1025
882
continue;
1026
883
}
1027
884
if(ret == 0){
1034
891
}
1035
892
1036
893
1037
fallback:
894
end:
1038
895
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1040
/* Fallback if all plugins failed, none are found or an error
1041
occured */
896
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
897
/* Fallback if all plugins failed, none are found or an error occured */
1042
898
bool bret;
1043
899
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1044
900
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);
901
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1052
902
if(not bret){
1053
903
perror("print_out_password");
1054
904
exitstatus = EXIT_FAILURE;
905
goto end;
1055
906
}
1056
907
}
1057
908
1058
909
/* Restore old signal handler */
1059
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1060
if(ret == -1){
1061
perror("sigaction");
1062
exitstatus = EXIT_FAILURE;
1063
}
1064
1065
if(custom_argv != NULL){
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1067
free(*arg);
910
sigaction(SIGCHLD, &old_sigchld_action, NULL);
911
912
free(custom_argv);
913
914
/* Free the plugin list */
915
for(plugin *next; plugin_list != NULL; plugin_list = next){
916
next = plugin_list->next;
917
free(plugin_list->argv);
918
if(plugin_list->environ[0] != NULL){
919
for(char **e = plugin_list->environ; *e != NULL; e++){
920
free(*e);
921
}
1068
922
}
1069
free(custom_argv);
923
free(plugin_list->environ);
924
free(plugin_list);
1070
925
}
1071
926
1072
927
if(dir != NULL){
1074
929
}
1075
930
1076
931
/* 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
}
932
for(process *next; process_list != NULL; process_list = next){
933
next = process_list->next;
934
close(process_list->fd);
935
ret = kill(process_list->pid, SIGTERM);
936
if(ret == -1 and errno != ESRCH){
937
/* set-uid proccesses migth not get closed */
938
perror("kill");
1085
939
}
940
free(process_list->buffer);
941
free(process_list);
1086
942
}
1087
943
1088
944
/* Wait for any remaining child processes to terminate */
1092
948
if(errno != ECHILD){
1093
949
perror("wait");
1094
950
}
1095
1096
free_plugin_list();
1097
1098
free(plugindir);
1099
free(argfile);
1100
951
1101
952
return exitstatus;
1102
953
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0