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- Committer: Teddy Hogeborn
- Date: 2008-10-18 10:58:29 UTC
- Revision ID: teddy@fukt.bsnet.se-20081018105829-qaav4114v6pengqr
* Makefile (all): Also depend on "mandos.lsm".
(mandos.lsm): New; update version and date fields.
* mandos.lsm: New; for submission to ibiblio.org, and possibly others.
(mandos.lsm): New; update version and date fields.
* mandos.lsm: New; for submission to ibiblio.org, and possibly others.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- network-protocol.txt
- 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 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, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, fileno(), fprintf(),
31
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, error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
60
61
#include <signal.h> /* struct sigaction, sigemptyset(),
61
62
sigaddset(), sigaction(),
62
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
65
#include <errno.h> /* errno, EBADF */
65
66
66
67
#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";
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
72
const char *argp_program_version = "plugin-runner " VERSION;
70
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
74
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
75
typedef struct plugin{
87
76
char *name; /* can be NULL or any plugin name */
88
77
char **argv;
90
79
char **environ;
91
80
int envc;
92
81
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;
93
92
struct plugin *next;
94
93
} plugin;
95
94
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
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){
98
102
if ((p->name == name)
99
103
or (p->name and name and (strcmp(p->name, name) == 0))){
100
104
return p;
105
109
if (new_plugin == NULL){
106
110
return NULL;
107
111
}
108
*new_plugin = (plugin) { .name = name,
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,
109
121
.argc = 1,
110
.envc = 0,
111
122
.disabled = false,
112
.next = *plugin_list };
123
.next = plugin_list };
113
124
114
125
new_plugin->argv = malloc(sizeof(char *) * 2);
115
126
if (new_plugin->argv == NULL){
127
free(copy_name);
116
128
free(new_plugin);
117
129
return NULL;
118
130
}
119
new_plugin->argv[0] = name;
131
new_plugin->argv[0] = copy_name;
120
132
new_plugin->argv[1] = NULL;
121
133
122
134
new_plugin->environ = malloc(sizeof(char *));
123
135
if(new_plugin->environ == NULL){
136
free(copy_name);
124
137
free(new_plugin->argv);
125
138
free(new_plugin);
126
139
return NULL;
127
140
}
128
141
new_plugin->environ[0] = NULL;
142
129
143
/* Append the new plugin to the list */
130
*plugin_list = new_plugin;
144
plugin_list = new_plugin;
131
145
return new_plugin;
132
146
}
133
147
163
177
}
164
178
165
179
/* Add to a plugin's environment */
166
static bool add_environment(plugin *p, const char *def){
180
static bool add_environment(plugin *p, const char *def, bool replace){
167
181
if(p == NULL){
168
182
return false;
169
183
}
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
}
170
201
return add_to_char_array(def, &(p->environ), &(p->envc));
171
202
}
172
203
173
174
204
/*
175
205
* Based on the example in the GNU LibC manual chapter 13.13 "File
176
206
* Descriptor Flags".
177
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
178
208
*/
179
static int set_cloexec_flag(int fd)
180
{
209
static int set_cloexec_flag(int fd){
181
210
int ret = fcntl(fd, F_GETFD, 0);
182
211
/* If reading the flags failed, return error indication now. */
183
212
if(ret < 0){
187
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
188
217
}
189
218
190
process *process_list = NULL;
191
219
192
/* Mark a process as completed when it exits, and save its exit
220
/* Mark processes as completed when they exit, and save their exit
193
221
status. */
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;
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
}
211
250
}
212
251
213
bool print_out_password(const char *buffer, size_t length){
252
/* Prints out a password to stdout */
253
static bool print_out_password(const char *buffer, size_t length){
214
254
ssize_t ret;
215
if(length>0 and buffer[length-1] == '\n'){
216
length--;
217
}
218
255
for(size_t written = 0; written < length; written += (size_t)ret){
219
256
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
220
257
length - written));
225
262
return true;
226
263
}
227
264
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;
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
}
234
289
}
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;
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
}
247
299
}
248
300
249
301
int main(int argc, char *argv[]){
250
const char *plugindir = "/lib/mandos/plugins.d";
251
const char *argfile = ARGFILE;
302
char *plugindir = NULL;
303
char *argfile = NULL;
252
304
FILE *conffp;
253
305
size_t d_name_len;
254
306
DIR *dir = NULL;
269
321
/* Establish a signal handler */
270
322
sigemptyset(&sigchld_action.sa_mask);
271
323
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
272
if(ret < 0){
324
if(ret == -1){
273
325
perror("sigaddset");
274
exit(EXIT_FAILURE);
326
exitstatus = EXIT_FAILURE;
327
goto fallback;
275
328
}
276
329
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
277
if(ret < 0){
330
if(ret == -1){
278
331
perror("sigaction");
279
exit(EXIT_FAILURE);
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
280
334
}
281
335
282
336
/* The options we understand. */
284
338
{ .name = "global-options", .key = 'g',
285
339
.arg = "OPTION[,OPTION[,...]]",
286
340
.doc = "Options passed to all plugins" },
287
{ .name = "global-envs", .key = 'e',
341
{ .name = "global-env", .key = 'G',
288
342
.arg = "VAR=value",
289
343
.doc = "Environment variable passed to all plugins" },
290
344
{ .name = "options-for", .key = 'o',
291
345
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
292
346
.doc = "Options passed only to specified plugin" },
293
{ .name = "envs-for", .key = 'f',
347
{ .name = "env-for", .key = 'E',
294
348
.arg = "PLUGIN:ENV=value",
295
349
.doc = "Environment variable passed to specified plugin" },
296
350
{ .name = "disable", .key = 'd',
297
351
.arg = "PLUGIN",
298
352
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
354
.arg = "PLUGIN",
355
.doc = "Enable a specific plugin", .group = 1 },
299
356
{ .name = "plugin-dir", .key = 128,
300
357
.arg = "DIRECTORY",
301
358
.doc = "Specify a different plugin directory", .group = 2 },
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 },
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 },
310
370
{ .name = NULL }
311
371
};
312
372
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;
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
317
375
switch (key) {
318
case 'g':
376
case 'g': /* --global-options */
319
377
if (arg != NULL){
320
378
char *p;
321
379
while((p = strsep(&arg, ",")) != NULL){
322
380
if(p[0] == '\0'){
323
381
continue;
324
382
}
325
if(not add_argument(getplugin(NULL, plugins), p)){
383
if(not add_argument(getplugin(NULL), p)){
326
384
perror("add_argument");
327
385
return ARGP_ERR_UNKNOWN;
328
386
}
329
387
}
330
388
}
331
389
break;
332
case 'e':
390
case 'G': /* --global-env */
333
391
if(arg == NULL){
334
392
break;
335
393
}
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
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
344
396
}
345
397
break;
346
case 'o':
398
case 'o': /* --options-for */
347
399
if (arg != NULL){
348
400
char *p_name = strsep(&arg, ":");
349
if(p_name[0] == '\0'){
401
if(p_name[0] == '\0' or arg == NULL){
350
402
break;
351
403
}
352
404
char *opt = strsep(&arg, ":");
353
if(opt[0] == '\0'){
405
if(opt[0] == '\0' or opt == NULL){
354
406
break;
355
407
}
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
}
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;
366
416
}
367
417
}
368
418
}
369
419
break;
370
case 'f':
420
case 'E': /* --env-for */
371
421
if(arg == NULL){
372
422
break;
373
423
}
376
426
if(envdef == NULL){
377
427
break;
378
428
}
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)){
429
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
385
431
perror("add_environment");
386
432
}
387
433
}
388
434
break;
389
case 'd':
435
case 'd': /* --disable */
390
436
if (arg != NULL){
391
plugin *p = getplugin(arg, plugins);
437
plugin *p = getplugin(arg);
392
438
if(p == NULL){
393
439
return ARGP_ERR_UNKNOWN;
394
440
}
395
441
p->disabled = true;
396
442
}
397
443
break;
398
case 128:
399
plugindir = arg;
400
break;
401
case 129:
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 */
402
464
uid = (uid_t)strtol(arg, NULL, 10);
403
465
break;
404
case 130:
466
case 131: /* --groupid */
405
467
gid = (gid_t)strtol(arg, NULL, 10);
406
468
break;
407
case 131:
469
case 132: /* --debug */
408
470
debug = true;
409
471
break;
410
472
case ARGP_KEY_ARG:
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]",
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 = "",
425
524
.doc = "Mandos plugin runner -- Run plugins" };
426
525
427
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
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);
428
529
if (ret == ARGP_ERR_UNKNOWN){
429
530
fprintf(stderr, "Unknown error while parsing arguments\n");
430
531
exitstatus = EXIT_FAILURE;
431
goto end;
532
goto fallback;
432
533
}
433
434
conffp = fopen(argfile, "r");
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
}
435
544
if(conffp != NULL){
436
545
char *org_line = NULL;
546
char *p, *arg, *new_arg, *line;
437
547
size_t size = 0;
438
548
ssize_t sret;
439
char *p, *arg, *new_arg, *line;
440
549
const char whitespace_delims[] = " \r\t\f\v\n";
441
550
const char comment_delim[] = "#";
442
551
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 */
443
564
while(true){
444
565
sret = getline(&org_line, &size, conffp);
445
566
if(sret == -1){
453
574
continue;
454
575
}
455
576
new_arg = strdup(p);
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
}
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;
462
595
}
463
596
}
464
597
free(org_line);
465
} else{
598
} else {
466
599
/* Check for harmful errors and go to fallback. Other errors might
467
600
not affect opening plugins */
468
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
469
602
perror("fopen");
470
603
exitstatus = EXIT_FAILURE;
471
goto end;
604
goto fallback;
472
605
}
473
606
}
474
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
475
609
if(custom_argv != NULL){
476
custom_argv[0] = argv[0];
477
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
478
612
if (ret == ARGP_ERR_UNKNOWN){
479
613
fprintf(stderr, "Unknown error while parsing arguments\n");
480
614
exitstatus = EXIT_FAILURE;
481
goto end;
615
goto fallback;
482
616
}
483
617
}
484
618
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
485
628
if(debug){
486
629
for(plugin *p = plugin_list; p != NULL; p=p->next){
487
630
fprintf(stderr, "Plugin: %s has %d arguments\n",
496
639
}
497
640
}
498
641
642
/* Strip permissions down to nobody */
499
643
ret = setuid(uid);
500
644
if (ret == -1){
501
645
perror("setuid");
502
}
503
646
}
504
647
setgid(gid);
505
648
if (ret == -1){
506
649
perror("setgid");
507
650
}
508
651
509
dir = opendir(plugindir);
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
510
658
if(dir == NULL){
511
659
perror("Could not open plugin dir");
512
660
exitstatus = EXIT_FAILURE;
513
goto end;
661
goto fallback;
514
662
}
515
663
516
664
/* Set the FD_CLOEXEC flag on the directory, if possible */
521
669
if(ret < 0){
522
670
perror("set_cloexec_flag");
523
671
exitstatus = EXIT_FAILURE;
524
goto end;
672
goto fallback;
525
673
}
526
674
}
527
675
}
528
676
529
677
FD_ZERO(&rfds_all);
530
678
679
/* Read and execute any executable in the plugin directory*/
531
680
while(true){
532
681
dirst = readdir(dir);
533
682
534
// All directory entries have been processed
683
/* All directory entries have been processed */
535
684
if(dirst == NULL){
536
685
if (errno == EBADF){
537
686
perror("readdir");
538
687
exitstatus = EXIT_FAILURE;
539
goto end;
688
goto fallback;
540
689
}
541
690
break;
542
691
}
543
692
544
693
d_name_len = strlen(dirst->d_name);
545
694
546
// Ignore dotfiles, backup files and other junk
695
/* Ignore dotfiles, backup files and other junk */
547
696
{
548
697
bool bad_name = false;
549
698
564
713
break;
565
714
}
566
715
}
567
568
716
if(bad_name){
569
717
continue;
570
718
}
571
572
719
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
573
720
size_t suf_len = strlen(*suf);
574
721
if((d_name_len >= suf_len)
589
736
}
590
737
591
738
char *filename;
592
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
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
}
593
744
if(ret < 0){
594
745
perror("asprintf");
595
746
continue;
601
752
free(filename);
602
753
continue;
603
754
}
604
755
756
/* Ignore non-executable files */
605
757
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
606
758
if(debug){
607
759
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
610
762
free(filename);
611
763
continue;
612
764
}
613
plugin *p = getplugin(dirst->d_name, &plugin_list);
765
766
plugin *p = getplugin(dirst->d_name);
614
767
if(p == NULL){
615
768
perror("getplugin");
616
769
free(filename);
626
779
}
627
780
{
628
781
/* Add global arguments to argument list for this plugin */
629
plugin *g = getplugin(NULL, &plugin_list);
782
plugin *g = getplugin(NULL);
630
783
if(g != NULL){
631
784
for(char **a = g->argv + 1; *a != NULL; a++){
632
785
if(not add_argument(p, *a)){
635
788
}
636
789
/* Add global environment variables */
637
790
for(char **e = g->environ; *e != NULL; e++){
638
if(not add_environment(p, *e)){
791
if(not add_environment(p, *e, false)){
639
792
perror("add_environment");
640
793
}
641
794
}
646
799
process, too. */
647
800
if(p->environ[0] != NULL){
648
801
for(char **e = environ; *e != NULL; e++){
649
char *copy = strdup(*e);
650
if(copy == NULL){
651
perror("strdup");
652
continue;
653
}
654
if(not add_environment(p, copy)){
802
if(not add_environment(p, *e, false)){
655
803
perror("add_environment");
656
804
}
657
805
}
658
806
}
659
807
660
int pipefd[2];
808
int pipefd[2];
661
809
ret = pipe(pipefd);
662
810
if (ret == -1){
663
811
perror("pipe");
664
812
exitstatus = EXIT_FAILURE;
665
goto end;
813
goto fallback;
666
814
}
815
/* Ask OS to automatic close the pipe on exec */
667
816
ret = set_cloexec_flag(pipefd[0]);
668
817
if(ret < 0){
669
818
perror("set_cloexec_flag");
670
819
exitstatus = EXIT_FAILURE;
671
goto end;
820
goto fallback;
672
821
}
673
822
ret = set_cloexec_flag(pipefd[1]);
674
823
if(ret < 0){
675
824
perror("set_cloexec_flag");
676
825
exitstatus = EXIT_FAILURE;
677
goto end;
826
goto fallback;
678
827
}
679
828
/* Block SIGCHLD until process is safely in process list */
680
829
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
681
830
if(ret < 0){
682
831
perror("sigprocmask");
683
832
exitstatus = EXIT_FAILURE;
684
goto end;
833
goto fallback;
685
834
}
686
// Starting a new process to be watched
835
/* Starting a new process to be watched */
687
836
pid_t pid = fork();
688
837
if(pid == -1){
689
838
perror("fork");
690
839
exitstatus = EXIT_FAILURE;
691
goto end;
840
goto fallback;
692
841
}
693
842
if(pid == 0){
694
843
/* this is the child process */
697
846
perror("sigaction");
698
847
_exit(EXIT_FAILURE);
699
848
}
700
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
849
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
701
850
if(ret < 0){
702
851
perror("sigprocmask");
703
852
_exit(EXIT_FAILURE);
704
853
}
705
854
706
855
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
707
856
if(ret == -1){
708
857
perror("dup2");
727
876
}
728
877
/* no return */
729
878
}
730
/* parent process */
879
/* Parent process */
880
close(pipefd[1]); /* Close unused write end of pipe */
731
881
free(filename);
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");
882
plugin *new_plugin = getplugin(dirst->d_name);
883
if (new_plugin == NULL){
884
perror("getplugin");
736
885
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
737
886
if(ret < 0){
738
perror("sigprocmask");
887
perror("sigprocmask");
739
888
}
740
889
exitstatus = EXIT_FAILURE;
741
goto end;
890
goto fallback;
742
891
}
743
892
744
*new_process = (struct process){ .pid = pid,
745
.fd = pipefd[0],
746
.next = process_list };
747
// List handling
748
process_list = new_process;
893
new_plugin->pid = pid;
894
new_plugin->fd = pipefd[0];
895
749
896
/* Unblock SIGCHLD so signal handler can be run if this process
750
897
has already completed */
751
898
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
752
899
if(ret < 0){
753
900
perror("sigprocmask");
754
901
exitstatus = EXIT_FAILURE;
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);
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
}
776
910
}
777
911
778
912
closedir(dir);
779
913
dir = NULL;
780
781
if (process_list == NULL){
782
fprintf(stderr, "No plugin processes started. Incorrect plugin"
783
" directory?\n");
784
process_list = NULL;
914
915
for(plugin *p = plugin_list; p != NULL; p = p->next){
916
if(p->pid != 0){
917
break;
918
}
919
if(p->next == NULL){
920
fprintf(stderr, "No plugin processes started. Incorrect plugin"
921
" directory?\n");
922
free_plugin_list();
923
}
785
924
}
786
while(process_list){
925
926
/* Main loop while running plugins exist */
927
while(plugin_list){
787
928
fd_set rfds = rfds_all;
788
929
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
789
930
if (select_ret == -1){
790
931
perror("select");
791
932
exitstatus = EXIT_FAILURE;
792
goto end;
933
goto fallback;
793
934
}
794
935
/* OK, now either a process completed, or something can be read
795
936
from one of them */
796
for(process *proc = process_list; proc ; proc = proc->next){
937
for(plugin *proc = plugin_list; proc != NULL;){
797
938
/* Is this process completely done? */
798
939
if(proc->eof and proc->completed){
799
940
/* Only accept the plugin output if it exited cleanly */
800
941
if(not WIFEXITED(proc->status)
801
942
or WEXITSTATUS(proc->status) != 0){
802
943
/* Bad exit by plugin */
944
803
945
if(debug){
804
946
if(WIFEXITED(proc->status)){
805
947
fprintf(stderr, "Plugin %u exited with status %d\n",
814
956
(unsigned int) (proc->pid));
815
957
}
816
958
}
959
817
960
/* Remove the plugin */
818
961
FD_CLR(proc->fd, &rfds_all);
962
819
963
/* Block signal while modifying process_list */
820
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
964
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
821
965
if(ret < 0){
822
966
perror("sigprocmask");
823
967
exitstatus = EXIT_FAILURE;
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
}
968
goto fallback;
969
}
970
971
plugin *next_plugin = proc->next;
972
free_plugin(proc);
973
proc = next_plugin;
974
839
975
/* We are done modifying process list, so unblock signal */
840
976
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
841
977
NULL);
842
978
if(ret < 0){
843
979
perror("sigprocmask");
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;
980
exitstatus = EXIT_FAILURE;
981
goto fallback;
982
}
983
984
if(plugin_list == NULL){
985
break;
986
}
987
988
continue;
851
989
}
990
852
991
/* This process exited nicely, so print its buffer */
853
854
bool bret = print_out_password(proc->buffer, proc->buffer_length);
992
993
bool bret = print_out_password(proc->buffer,
994
proc->buffer_length);
855
995
if(not bret){
856
996
perror("print_out_password");
857
997
exitstatus = EXIT_FAILURE;
858
998
}
859
goto end;
999
goto fallback;
860
1000
}
1001
861
1002
/* This process has not completed. Does it have any output? */
862
1003
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
863
1004
/* This process had nothing to say at this time */
1005
proc = proc->next;
864
1006
continue;
865
1007
}
866
1008
/* Before reading, make the process' data buffer large enough */
870
1012
if (proc->buffer == NULL){
871
1013
perror("malloc");
872
1014
exitstatus = EXIT_FAILURE;
873
goto end;
1015
goto fallback;
874
1016
}
875
1017
proc->buffer_size += BUFFER_SIZE;
876
1018
}
879
1021
BUFFER_SIZE);
880
1022
if(ret < 0){
881
1023
/* Read error from this process; ignore the error */
1024
proc = proc->next;
882
1025
continue;
883
1026
}
884
1027
if(ret == 0){
891
1034
}
892
1035
893
1036
894
end:
1037
fallback:
895
1038
896
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
897
/* Fallback if all plugins failed, none are found or an error occured */
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1040
/* Fallback if all plugins failed, none are found or an error
1041
occured */
898
1042
bool bret;
899
1043
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
900
1044
char *passwordbuffer = getpass("Password: ");
901
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
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);
902
1052
if(not bret){
903
1053
perror("print_out_password");
904
1054
exitstatus = EXIT_FAILURE;
905
goto end;
906
1055
}
907
1056
}
908
1057
909
1058
/* Restore old signal handler */
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
}
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);
922
1068
}
923
free(plugin_list->environ);
924
free(plugin_list);
1069
free(custom_argv);
925
1070
}
926
1071
927
1072
if(dir != NULL){
928
1073
closedir(dir);
929
1074
}
930
1075
931
/* Free the process list and kill the processes */
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");
1076
/* 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
}
939
1085
}
940
free(process_list->buffer);
941
free(process_list);
942
1086
}
943
1087
944
1088
/* Wait for any remaining child processes to terminate */
949
1093
perror("wait");
950
1094
}
951
1095
1096
free_plugin_list();
1097
1098
free(plugindir);
1099
free(argfile);
1100
952
1101
return exitstatus;
953
1102
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0