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- Committer: Teddy Hogeborn
- Date: 2009-01-13 04:45:33 UTC
- Revision ID: teddy@fukt.bsnet.se-20090113044533-de691yv0fa5w6quw
* plugins.d/mandos-client.c: Only comment changes.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
32
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
46
47
fcntl(), setuid(), setgid(),
47
48
F_GETFD, F_SETFD, FD_CLOEXEC,
48
49
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
dup2(), STDOUT_FILENO, _exit(),
50
51
execv(), write(), read(),
51
52
close() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
56
57
#include <argp.h> /* struct argp_option, struct
57
58
argp_state, struct argp,
58
59
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
60
62
#include <signal.h> /* struct sigaction, sigemptyset(),
61
63
sigaddset(), sigaction(),
62
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
66
#include <errno.h> /* errno, EBADF */
65
67
66
68
#define BUFFER_SIZE 256
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
69
70
#define PDIR "/lib/mandos/plugins.d"
71
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
73
const char *argp_program_version = "plugin-runner " VERSION;
70
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
75
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
86
76
typedef struct plugin{
87
77
char *name; /* can be NULL or any plugin name */
88
78
char **argv;
90
80
char **environ;
91
81
int envc;
92
82
bool disabled;
83
84
/* Variables used for running processes*/
85
pid_t pid;
86
int fd;
87
char *buffer;
88
size_t buffer_size;
89
size_t buffer_length;
90
bool eof;
91
volatile bool completed;
92
volatile int status;
93
93
struct plugin *next;
94
94
} plugin;
95
95
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
if ((p->name == name)
99
or (p->name and name and (strcmp(p->name, name) == 0))){
96
static plugin *plugin_list = NULL;
97
98
/* Gets an existing plugin based on name,
99
or if none is found, creates a new one */
100
static plugin *getplugin(char *name){
101
/* Check for exiting plugin with that name */
102
for(plugin *p = plugin_list; p != NULL; p = p->next){
103
if((p->name == name)
104
or (p->name and name and (strcmp(p->name, name) == 0))){
100
105
return p;
101
106
}
102
107
}
103
108
/* Create a new plugin */
104
109
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
110
if(new_plugin == NULL){
106
111
return NULL;
107
112
}
108
113
char *copy_name = NULL;
115
120
116
121
*new_plugin = (plugin) { .name = copy_name,
117
122
.argc = 1,
118
.envc = 0,
119
123
.disabled = false,
120
.next = *plugin_list };
124
.next = plugin_list };
121
125
122
126
new_plugin->argv = malloc(sizeof(char *) * 2);
123
if (new_plugin->argv == NULL){
127
if(new_plugin->argv == NULL){
124
128
free(copy_name);
125
129
free(new_plugin);
126
130
return NULL;
127
131
}
128
132
new_plugin->argv[0] = copy_name;
129
133
new_plugin->argv[1] = NULL;
130
134
131
135
new_plugin->environ = malloc(sizeof(char *));
132
136
if(new_plugin->environ == NULL){
133
137
free(copy_name);
136
140
return NULL;
137
141
}
138
142
new_plugin->environ[0] = NULL;
143
139
144
/* Append the new plugin to the list */
140
*plugin_list = new_plugin;
145
plugin_list = new_plugin;
141
146
return new_plugin;
142
147
}
143
148
173
178
}
174
179
175
180
/* Add to a plugin's environment */
176
static bool add_environment(plugin *p, const char *def){
181
static bool add_environment(plugin *p, const char *def, bool replace){
177
182
if(p == NULL){
178
183
return false;
179
184
}
185
/* namelen = length of name of environment variable */
186
size_t namelen = (size_t)(strchrnul(def, '=') - def);
187
/* Search for this environment variable */
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
190
/* It already exists */
191
if(replace){
192
char *new = realloc(*e, strlen(def) + 1);
193
if(new == NULL){
194
return false;
195
}
196
*e = new;
197
strcpy(*e, def);
198
}
199
return true;
200
}
201
}
180
202
return add_to_char_array(def, &(p->environ), &(p->envc));
181
203
}
182
204
183
184
205
/*
185
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
186
207
* Descriptor Flags".
187
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
188
209
*/
189
static int set_cloexec_flag(int fd)
190
{
210
static int set_cloexec_flag(int fd){
191
211
int ret = fcntl(fd, F_GETFD, 0);
192
212
/* If reading the flags failed, return error indication now. */
193
213
if(ret < 0){
197
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
198
218
}
199
219
200
process *process_list = NULL;
201
220
202
/* Mark a process as completed when it exits, and save its exit
221
/* Mark processes as completed when they exit, and save their exit
203
222
status. */
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
206
int status;
207
pid_t pid = wait(&status);
208
if(pid == -1){
209
perror("wait");
210
return;
211
}
212
while(proc != NULL and proc->pid != pid){
213
proc = proc->next;
214
}
215
if(proc == NULL){
216
/* Process not found in process list */
217
return;
218
}
219
proc->status = status;
220
proc->completed = true;
223
static void handle_sigchld(__attribute__((unused)) int sig){
224
while(true){
225
plugin *proc = plugin_list;
226
int status;
227
pid_t pid = waitpid(-1, &status, WNOHANG);
228
if(pid == 0){
229
/* Only still running child processes */
230
break;
231
}
232
if(pid == -1){
233
if(errno != ECHILD){
234
perror("waitpid");
235
}
236
/* No child processes */
237
break;
238
}
239
240
/* A child exited, find it in process_list */
241
while(proc != NULL and proc->pid != pid){
242
proc = proc->next;
243
}
244
if(proc == NULL){
245
/* Process not found in process list */
246
continue;
247
}
248
proc->status = status;
249
proc->completed = true;
250
}
221
251
}
222
252
223
bool print_out_password(const char *buffer, size_t length){
253
/* Prints out a password to stdout */
254
static bool print_out_password(const char *buffer, size_t length){
224
255
ssize_t ret;
225
if(length>0 and buffer[length-1] == '\n'){
226
length--;
227
}
228
256
for(size_t written = 0; written < length; written += (size_t)ret){
229
257
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
230
258
length - written));
235
263
return true;
236
264
}
237
265
238
char **add_to_argv(char **argv, int *argc, char *arg){
239
if (argv == NULL){
240
*argc = 1;
241
argv = malloc(sizeof(char*) * 2);
242
if(argv == NULL){
243
return NULL;
266
/* Removes and free a plugin from the plugin list */
267
static void free_plugin(plugin *plugin_node){
268
269
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
270
free(*arg);
271
}
272
free(plugin_node->argv);
273
for(char **env = plugin_node->environ; *env != NULL; env++){
274
free(*env);
275
}
276
free(plugin_node->environ);
277
free(plugin_node->buffer);
278
279
/* Removes the plugin from the singly-linked list */
280
if(plugin_node == plugin_list){
281
/* First one - simple */
282
plugin_list = plugin_list->next;
283
} else {
284
/* Second one or later */
285
for(plugin *p = plugin_list; p != NULL; p = p->next){
286
if(p->next == plugin_node){
287
p->next = plugin_node->next;
288
break;
289
}
244
290
}
245
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
246
argv[1] = NULL;
247
}
248
*argc += 1;
249
argv = realloc(argv, sizeof(char *)
250
* ((unsigned int) *argc + 1));
251
if(argv == NULL){
252
return NULL;
253
}
254
argv[*argc-1] = arg;
255
argv[*argc] = NULL;
256
return argv;
291
}
292
293
free(plugin_node);
257
294
}
258
295
259
static void free_plugin_list(plugin *plugin_list){
260
for(plugin *next; plugin_list != NULL; plugin_list = next){
261
next = plugin_list->next;
262
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
263
free(*arg);
264
}
265
free(plugin_list->argv);
266
for(char **env = plugin_list->environ; *env != NULL; env++){
267
free(*env);
268
}
269
free(plugin_list->environ);
270
free(plugin_list);
296
static void free_plugin_list(void){
297
while(plugin_list != NULL){
298
free_plugin(plugin_list);
271
299
}
272
300
}
273
301
274
302
int main(int argc, char *argv[]){
275
const char *plugindir = "/lib/mandos/plugins.d";
276
const char *argfile = ARGFILE;
303
char *plugindir = NULL;
304
char *argfile = NULL;
277
305
FILE *conffp;
278
306
size_t d_name_len;
279
307
DIR *dir = NULL;
281
309
struct stat st;
282
310
fd_set rfds_all;
283
311
int ret, maxfd = 0;
312
ssize_t sret;
284
313
uid_t uid = 65534;
285
314
gid_t gid = 65534;
286
315
bool debug = false;
311
340
{ .name = "global-options", .key = 'g',
312
341
.arg = "OPTION[,OPTION[,...]]",
313
342
.doc = "Options passed to all plugins" },
314
{ .name = "global-envs", .key = 'e',
343
{ .name = "global-env", .key = 'G',
315
344
.arg = "VAR=value",
316
345
.doc = "Environment variable passed to all plugins" },
317
346
{ .name = "options-for", .key = 'o',
318
347
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
319
348
.doc = "Options passed only to specified plugin" },
320
{ .name = "envs-for", .key = 'f',
349
{ .name = "env-for", .key = 'E',
321
350
.arg = "PLUGIN:ENV=value",
322
351
.doc = "Environment variable passed to specified plugin" },
323
352
{ .name = "disable", .key = 'd',
324
353
.arg = "PLUGIN",
325
354
.doc = "Disable a specific plugin", .group = 1 },
355
{ .name = "enable", .key = 'e',
356
.arg = "PLUGIN",
357
.doc = "Enable a specific plugin", .group = 1 },
326
358
{ .name = "plugin-dir", .key = 128,
327
359
.arg = "DIRECTORY",
328
360
.doc = "Specify a different plugin directory", .group = 2 },
329
{ .name = "userid", .key = 129,
330
.arg = "ID", .flags = 0,
331
.doc = "User ID the plugins will run as", .group = 2 },
332
{ .name = "groupid", .key = 130,
333
.arg = "ID", .flags = 0,
334
.doc = "Group ID the plugins will run as", .group = 2 },
335
{ .name = "debug", .key = 131,
336
.doc = "Debug mode", .group = 3 },
361
{ .name = "config-file", .key = 129,
362
.arg = "FILE",
363
.doc = "Specify a different configuration file", .group = 2 },
364
{ .name = "userid", .key = 130,
365
.arg = "ID", .flags = 0,
366
.doc = "User ID the plugins will run as", .group = 3 },
367
{ .name = "groupid", .key = 131,
368
.arg = "ID", .flags = 0,
369
.doc = "Group ID the plugins will run as", .group = 3 },
370
{ .name = "debug", .key = 132,
371
.doc = "Debug mode", .group = 4 },
337
372
{ .name = NULL }
338
373
};
339
374
340
error_t parse_opt (int key, char *arg, struct argp_state *state) {
341
/* Get the INPUT argument from `argp_parse', which we know is a
342
pointer to our plugin list pointer. */
343
plugin **plugins = state->input;
344
switch (key) {
345
case 'g':
346
if (arg != NULL){
375
error_t parse_opt(int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
377
switch(key) {
378
case 'g': /* --global-options */
379
if(arg != NULL){
347
380
char *p;
348
381
while((p = strsep(&arg, ",")) != NULL){
349
382
if(p[0] == '\0'){
350
383
continue;
351
384
}
352
if(not add_argument(getplugin(NULL, plugins), p)){
385
if(not add_argument(getplugin(NULL), p)){
353
386
perror("add_argument");
354
387
return ARGP_ERR_UNKNOWN;
355
388
}
356
389
}
357
390
}
358
391
break;
359
case 'e':
392
case 'G': /* --global-env */
360
393
if(arg == NULL){
361
394
break;
362
395
}
363
{
364
char *envdef = strdup(arg);
365
if(envdef == NULL){
366
break;
367
}
368
if(not add_environment(getplugin(NULL, plugins), envdef)){
369
perror("add_environment");
370
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
371
398
}
372
399
break;
373
case 'o':
374
if (arg != NULL){
400
case 'o': /* --options-for */
401
if(arg != NULL){
375
402
char *p_name = strsep(&arg, ":");
376
if(p_name[0] == '\0'){
403
if(p_name[0] == '\0' or arg == NULL){
377
404
break;
378
405
}
379
406
char *opt = strsep(&arg, ":");
380
if(opt[0] == '\0'){
407
if(opt[0] == '\0' or opt == NULL){
381
408
break;
382
409
}
383
if(opt != NULL){
384
char *p;
385
while((p = strsep(&opt, ",")) != NULL){
386
if(p[0] == '\0'){
387
continue;
388
}
389
if(not add_argument(getplugin(p_name, plugins), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
392
}
410
char *p;
411
while((p = strsep(&opt, ",")) != NULL){
412
if(p[0] == '\0'){
413
continue;
414
}
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
393
418
}
394
419
}
395
420
}
396
421
break;
397
case 'f':
422
case 'E': /* --env-for */
398
423
if(arg == NULL){
399
424
break;
400
425
}
403
428
if(envdef == NULL){
404
429
break;
405
430
}
406
char *p_name = strndup(arg, (size_t) (envdef-arg));
407
if(p_name == NULL){
408
break;
409
}
410
envdef++;
411
if(not add_environment(getplugin(p_name, plugins), envdef)){
431
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
412
433
perror("add_environment");
413
434
}
414
435
}
415
436
break;
416
case 'd':
417
if (arg != NULL){
418
plugin *p = getplugin(arg, plugins);
437
case 'd': /* --disable */
438
if(arg != NULL){
439
plugin *p = getplugin(arg);
419
440
if(p == NULL){
420
441
return ARGP_ERR_UNKNOWN;
421
442
}
422
443
p->disabled = true;
423
444
}
424
445
break;
425
case 128:
426
plugindir = arg;
427
break;
428
case 129:
429
uid = (uid_t)strtol(arg, NULL, 10);
430
break;
431
case 130:
432
gid = (gid_t)strtol(arg, NULL, 10);
433
break;
434
case 131:
446
case 'e': /* --enable */
447
if(arg != NULL){
448
plugin *p = getplugin(arg);
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
451
}
452
p->disabled = false;
453
}
454
break;
455
case 128: /* --plugin-dir */
456
free(plugindir);
457
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
461
break;
462
case 129: /* --config-file */
463
/* This is already done by parse_opt_config_file() */
464
break;
465
case 130: /* --userid */
466
/* In the GNU C library, uid_t is always unsigned int */
467
ret = sscanf(arg, "%u", &uid);
468
if(ret != 1){
469
fprintf(stderr, "Bad user ID number: \"%s\", using %u\n", arg,
470
uid);
471
}
472
break;
473
case 131: /* --groupid */
474
/* In the GNU C library, gid_t is always unsigned int */
475
ret = sscanf(arg, "%u", &gid);
476
if(ret != 1){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %u\n",
478
arg, gid);
479
}
480
break;
481
case 132: /* --debug */
435
482
debug = true;
436
483
break;
437
case ARGP_KEY_ARG:
438
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
439
break;
440
case ARGP_KEY_END:
441
break;
442
default:
443
return ARGP_ERR_UNKNOWN;
444
}
445
return 0;
446
}
447
448
plugin *plugin_list = NULL;
449
450
struct argp argp = { .options = options, .parser = parse_opt,
451
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
484
/*
485
* When adding more options before this line, remember to also add a
486
* "case" to the "parse_opt_config_file" function below.
487
*/
488
case ARGP_KEY_ARG:
489
/* Cryptsetup always passes an argument, which is an empty
490
string if "none" was specified in /etc/crypttab. So if
491
argument was empty, we ignore it silently. */
492
if(arg[0] != '\0'){
493
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
494
}
495
break;
496
case ARGP_KEY_END:
497
break;
498
default:
499
return ARGP_ERR_UNKNOWN;
500
}
501
return 0;
502
}
503
504
/* This option parser is the same as parse_opt() above, except it
505
ignores everything but the --config-file option. */
506
error_t parse_opt_config_file(int key, char *arg,
507
__attribute__((unused))
508
struct argp_state *state) {
509
switch(key) {
510
case 'g': /* --global-options */
511
case 'G': /* --global-env */
512
case 'o': /* --options-for */
513
case 'E': /* --env-for */
514
case 'd': /* --disable */
515
case 'e': /* --enable */
516
case 128: /* --plugin-dir */
517
break;
518
case 129: /* --config-file */
519
free(argfile);
520
argfile = strdup(arg);
521
if(argfile == NULL){
522
perror("strdup");
523
}
524
break;
525
case 130: /* --userid */
526
case 131: /* --groupid */
527
case 132: /* --debug */
528
case ARGP_KEY_ARG:
529
case ARGP_KEY_END:
530
break;
531
default:
532
return ARGP_ERR_UNKNOWN;
533
}
534
return 0;
535
}
536
537
struct argp argp = { .options = options,
538
.parser = parse_opt_config_file,
539
.args_doc = "",
452
540
.doc = "Mandos plugin runner -- Run plugins" };
453
541
454
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
455
if (ret == ARGP_ERR_UNKNOWN){
542
/* Parse using parse_opt_config_file() in order to get the custom
543
config file location, if any. */
544
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
545
if(ret == ARGP_ERR_UNKNOWN){
456
546
fprintf(stderr, "Unknown error while parsing arguments\n");
457
547
exitstatus = EXIT_FAILURE;
458
548
goto fallback;
459
549
}
460
461
conffp = fopen(argfile, "r");
550
551
/* Reset to the normal argument parser */
552
argp.parser = parse_opt;
553
554
/* Open the configfile if available */
555
if(argfile == NULL){
556
conffp = fopen(AFILE, "r");
557
} else {
558
conffp = fopen(argfile, "r");
559
}
462
560
if(conffp != NULL){
463
561
char *org_line = NULL;
464
562
char *p, *arg, *new_arg, *line;
465
563
size_t size = 0;
466
ssize_t sret;
467
564
const char whitespace_delims[] = " \r\t\f\v\n";
468
565
const char comment_delim[] = "#";
469
566
567
custom_argc = 1;
568
custom_argv = malloc(sizeof(char*) * 2);
569
if(custom_argv == NULL){
570
perror("malloc");
571
exitstatus = EXIT_FAILURE;
572
goto fallback;
573
}
574
custom_argv[0] = argv[0];
575
custom_argv[1] = NULL;
576
577
/* for each line in the config file, strip whitespace and ignore
578
commented text */
470
579
while(true){
471
580
sret = getline(&org_line, &size, conffp);
472
581
if(sret == -1){
480
589
continue;
481
590
}
482
591
new_arg = strdup(p);
483
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
484
if (custom_argv == NULL){
485
perror("add_to_argv");
486
exitstatus = EXIT_FAILURE;
487
goto fallback;
488
}
592
if(new_arg == NULL){
593
perror("strdup");
594
exitstatus = EXIT_FAILURE;
595
free(org_line);
596
goto fallback;
597
}
598
599
custom_argc += 1;
600
custom_argv = realloc(custom_argv, sizeof(char *)
601
* ((unsigned int) custom_argc + 1));
602
if(custom_argv == NULL){
603
perror("realloc");
604
exitstatus = EXIT_FAILURE;
605
free(org_line);
606
goto fallback;
607
}
608
custom_argv[custom_argc-1] = new_arg;
609
custom_argv[custom_argc] = NULL;
489
610
}
490
611
}
491
612
free(org_line);
492
} else{
613
} else {
493
614
/* Check for harmful errors and go to fallback. Other errors might
494
615
not affect opening plugins */
495
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
616
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
496
617
perror("fopen");
497
618
exitstatus = EXIT_FAILURE;
498
619
goto fallback;
499
620
}
500
621
}
501
622
/* If there was any arguments from configuration file,
623
pass them to parser as command arguments */
502
624
if(custom_argv != NULL){
503
custom_argv[0] = argv[0];
504
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
505
if (ret == ARGP_ERR_UNKNOWN){
625
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
626
0, NULL);
627
if(ret == ARGP_ERR_UNKNOWN){
506
628
fprintf(stderr, "Unknown error while parsing arguments\n");
507
629
exitstatus = EXIT_FAILURE;
508
630
goto fallback;
509
631
}
510
632
}
511
633
634
/* Parse actual command line arguments, to let them override the
635
config file */
636
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
637
if(ret == ARGP_ERR_UNKNOWN){
638
fprintf(stderr, "Unknown error while parsing arguments\n");
639
exitstatus = EXIT_FAILURE;
640
goto fallback;
641
}
642
512
643
if(debug){
513
644
for(plugin *p = plugin_list; p != NULL; p=p->next){
514
645
fprintf(stderr, "Plugin: %s has %d arguments\n",
523
654
}
524
655
}
525
656
657
/* Strip permissions down to nobody */
526
658
ret = setuid(uid);
527
if (ret == -1){
659
if(ret == -1){
528
660
perror("setuid");
529
}
530
661
}
531
662
setgid(gid);
532
if (ret == -1){
663
if(ret == -1){
533
664
perror("setgid");
534
665
}
535
666
536
dir = opendir(plugindir);
667
if(plugindir == NULL){
668
dir = opendir(PDIR);
669
} else {
670
dir = opendir(plugindir);
671
}
672
537
673
if(dir == NULL){
538
674
perror("Could not open plugin dir");
539
675
exitstatus = EXIT_FAILURE;
555
691
556
692
FD_ZERO(&rfds_all);
557
693
694
/* Read and execute any executable in the plugin directory*/
558
695
while(true){
559
696
dirst = readdir(dir);
560
697
561
// All directory entries have been processed
698
/* All directory entries have been processed */
562
699
if(dirst == NULL){
563
if (errno == EBADF){
700
if(errno == EBADF){
564
701
perror("readdir");
565
702
exitstatus = EXIT_FAILURE;
566
703
goto fallback;
570
707
571
708
d_name_len = strlen(dirst->d_name);
572
709
573
// Ignore dotfiles, backup files and other junk
710
/* Ignore dotfiles, backup files and other junk */
574
711
{
575
712
bool bad_name = false;
576
713
578
715
579
716
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
580
717
".dpkg-old",
718
".dpkg-bak",
581
719
".dpkg-divert", NULL };
582
720
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
583
721
size_t pre_len = strlen(*pre);
591
729
break;
592
730
}
593
731
}
594
595
732
if(bad_name){
596
733
continue;
597
734
}
598
599
735
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
600
736
size_t suf_len = strlen(*suf);
601
737
if((d_name_len >= suf_len)
616
752
}
617
753
618
754
char *filename;
619
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
755
if(plugindir == NULL){
756
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
757
} else {
758
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
759
}
620
760
if(ret < 0){
621
761
perror("asprintf");
622
762
continue;
623
763
}
624
764
625
765
ret = stat(filename, &st);
626
if (ret == -1){
766
if(ret == -1){
627
767
perror("stat");
628
768
free(filename);
629
769
continue;
630
770
}
631
632
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
771
772
/* Ignore non-executable files */
773
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
633
774
if(debug){
634
775
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
635
776
" with bad type or mode\n", filename);
637
778
free(filename);
638
779
continue;
639
780
}
640
plugin *p = getplugin(dirst->d_name, &plugin_list);
781
782
plugin *p = getplugin(dirst->d_name);
641
783
if(p == NULL){
642
784
perror("getplugin");
643
785
free(filename);
653
795
}
654
796
{
655
797
/* Add global arguments to argument list for this plugin */
656
plugin *g = getplugin(NULL, &plugin_list);
798
plugin *g = getplugin(NULL);
657
799
if(g != NULL){
658
800
for(char **a = g->argv + 1; *a != NULL; a++){
659
801
if(not add_argument(p, *a)){
662
804
}
663
805
/* Add global environment variables */
664
806
for(char **e = g->environ; *e != NULL; e++){
665
if(not add_environment(p, *e)){
807
if(not add_environment(p, *e, false)){
666
808
perror("add_environment");
667
809
}
668
810
}
673
815
process, too. */
674
816
if(p->environ[0] != NULL){
675
817
for(char **e = environ; *e != NULL; e++){
676
char *copy = strdup(*e);
677
if(copy == NULL){
678
perror("strdup");
679
continue;
680
}
681
if(not add_environment(p, copy)){
818
if(not add_environment(p, *e, false)){
682
819
perror("add_environment");
683
820
}
684
821
}
686
823
687
824
int pipefd[2];
688
825
ret = pipe(pipefd);
689
if (ret == -1){
826
if(ret == -1){
690
827
perror("pipe");
691
828
exitstatus = EXIT_FAILURE;
692
829
goto fallback;
693
830
}
831
/* Ask OS to automatic close the pipe on exec */
694
832
ret = set_cloexec_flag(pipefd[0]);
695
833
if(ret < 0){
696
834
perror("set_cloexec_flag");
704
842
goto fallback;
705
843
}
706
844
/* Block SIGCHLD until process is safely in process list */
707
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
845
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
708
846
if(ret < 0){
709
847
perror("sigprocmask");
710
848
exitstatus = EXIT_FAILURE;
711
849
goto fallback;
712
850
}
713
// Starting a new process to be watched
851
/* Starting a new process to be watched */
714
852
pid_t pid = fork();
715
853
if(pid == -1){
716
854
perror("fork");
724
862
perror("sigaction");
725
863
_exit(EXIT_FAILURE);
726
864
}
727
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
865
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
728
866
if(ret < 0){
729
867
perror("sigprocmask");
730
868
_exit(EXIT_FAILURE);
731
869
}
732
870
733
871
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
734
872
if(ret == -1){
735
873
perror("dup2");
754
892
}
755
893
/* no return */
756
894
}
757
/* parent process */
895
/* Parent process */
896
close(pipefd[1]); /* Close unused write end of pipe */
758
897
free(filename);
759
close(pipefd[1]); /* close unused write end of pipe */
760
process *new_process = malloc(sizeof(process));
761
if (new_process == NULL){
762
perror("malloc");
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
898
plugin *new_plugin = getplugin(dirst->d_name);
899
if(new_plugin == NULL){
900
perror("getplugin");
901
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
764
902
if(ret < 0){
765
perror("sigprocmask");
903
perror("sigprocmask");
766
904
}
767
905
exitstatus = EXIT_FAILURE;
768
906
goto fallback;
769
907
}
770
908
771
*new_process = (struct process){ .pid = pid,
772
.fd = pipefd[0],
773
.next = process_list };
774
// List handling
775
process_list = new_process;
909
new_plugin->pid = pid;
910
new_plugin->fd = pipefd[0];
911
776
912
/* Unblock SIGCHLD so signal handler can be run if this process
777
913
has already completed */
778
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
914
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
779
915
if(ret < 0){
780
916
perror("sigprocmask");
781
917
exitstatus = EXIT_FAILURE;
782
918
goto fallback;
783
919
}
784
920
785
FD_SET(new_process->fd, &rfds_all);
921
FD_SET(new_plugin->fd, &rfds_all);
786
922
787
if (maxfd < new_process->fd){
788
maxfd = new_process->fd;
923
if(maxfd < new_plugin->fd){
924
maxfd = new_plugin->fd;
789
925
}
790
791
926
}
792
927
793
free_plugin_list(plugin_list);
794
plugin_list = NULL;
795
796
928
closedir(dir);
797
929
dir = NULL;
798
799
if (process_list == NULL){
800
fprintf(stderr, "No plugin processes started. Incorrect plugin"
801
" directory?\n");
802
process_list = NULL;
930
931
for(plugin *p = plugin_list; p != NULL; p = p->next){
932
if(p->pid != 0){
933
break;
934
}
935
if(p->next == NULL){
936
fprintf(stderr, "No plugin processes started. Incorrect plugin"
937
" directory?\n");
938
free_plugin_list();
939
}
803
940
}
804
while(process_list){
941
942
/* Main loop while running plugins exist */
943
while(plugin_list){
805
944
fd_set rfds = rfds_all;
806
945
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
807
if (select_ret == -1){
946
if(select_ret == -1){
808
947
perror("select");
809
948
exitstatus = EXIT_FAILURE;
810
949
goto fallback;
811
950
}
812
951
/* OK, now either a process completed, or something can be read
813
952
from one of them */
814
for(process *proc = process_list; proc ; proc = proc->next){
953
for(plugin *proc = plugin_list; proc != NULL;){
815
954
/* Is this process completely done? */
816
955
if(proc->eof and proc->completed){
817
956
/* Only accept the plugin output if it exited cleanly */
818
957
if(not WIFEXITED(proc->status)
819
958
or WEXITSTATUS(proc->status) != 0){
820
959
/* Bad exit by plugin */
960
821
961
if(debug){
822
962
if(WIFEXITED(proc->status)){
823
963
fprintf(stderr, "Plugin %u exited with status %d\n",
828
968
(unsigned int) (proc->pid),
829
969
WTERMSIG(proc->status));
830
970
} else if(WCOREDUMP(proc->status)){
831
fprintf(stderr, "Plugin %d dumped core\n",
971
fprintf(stderr, "Plugin %u dumped core\n",
832
972
(unsigned int) (proc->pid));
833
973
}
834
974
}
975
835
976
/* Remove the plugin */
836
977
FD_CLR(proc->fd, &rfds_all);
978
837
979
/* Block signal while modifying process_list */
838
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
980
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
839
981
if(ret < 0){
840
982
perror("sigprocmask");
841
983
exitstatus = EXIT_FAILURE;
842
984
goto fallback;
843
985
}
844
/* Delete this process entry from the list */
845
if(process_list == proc){
846
/* First one - simple */
847
process_list = proc->next;
848
} else {
849
/* Second one or later */
850
for(process *p = process_list; p != NULL; p = p->next){
851
if(p->next == proc){
852
p->next = proc->next;
853
break;
854
}
855
}
856
}
986
987
plugin *next_plugin = proc->next;
988
free_plugin(proc);
989
proc = next_plugin;
990
857
991
/* We are done modifying process list, so unblock signal */
858
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
859
NULL);
992
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
993
NULL);
860
994
if(ret < 0){
861
995
perror("sigprocmask");
862
}
863
free(proc->buffer);
864
free(proc);
865
/* We deleted this process from the list, so we can't go
866
proc->next. Therefore, start over from the beginning of
867
the process list */
868
break;
996
exitstatus = EXIT_FAILURE;
997
goto fallback;
998
}
999
1000
if(plugin_list == NULL){
1001
break;
1002
}
1003
1004
continue;
869
1005
}
1006
870
1007
/* This process exited nicely, so print its buffer */
871
872
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1008
1009
bool bret = print_out_password(proc->buffer,
1010
proc->buffer_length);
873
1011
if(not bret){
874
1012
perror("print_out_password");
875
1013
exitstatus = EXIT_FAILURE;
876
1014
}
877
1015
goto fallback;
878
1016
}
1017
879
1018
/* This process has not completed. Does it have any output? */
880
1019
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
881
1020
/* This process had nothing to say at this time */
1021
proc = proc->next;
882
1022
continue;
883
1023
}
884
1024
/* Before reading, make the process' data buffer large enough */
885
1025
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
886
1026
proc->buffer = realloc(proc->buffer, proc->buffer_size
887
1027
+ (size_t) BUFFER_SIZE);
888
if (proc->buffer == NULL){
1028
if(proc->buffer == NULL){
889
1029
perror("malloc");
890
1030
exitstatus = EXIT_FAILURE;
891
1031
goto fallback;
893
1033
proc->buffer_size += BUFFER_SIZE;
894
1034
}
895
1035
/* Read from the process */
896
ret = read(proc->fd, proc->buffer + proc->buffer_length,
897
BUFFER_SIZE);
898
if(ret < 0){
1036
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1037
BUFFER_SIZE);
1038
if(sret < 0){
899
1039
/* Read error from this process; ignore the error */
1040
proc = proc->next;
900
1041
continue;
901
1042
}
902
if(ret == 0){
1043
if(sret == 0){
903
1044
/* got EOF */
904
1045
proc->eof = true;
905
1046
} else {
906
proc->buffer_length += (size_t) ret;
1047
proc->buffer_length += (size_t) sret;
907
1048
}
908
1049
}
909
1050
}
911
1052
912
1053
fallback:
913
1054
914
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
915
/* Fallback if all plugins failed, none are found or an error occured */
1055
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1056
/* Fallback if all plugins failed, none are found or an error
1057
occured */
916
1058
bool bret;
917
1059
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
918
1060
char *passwordbuffer = getpass("Password: ");
919
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1061
size_t len = strlen(passwordbuffer);
1062
/* Strip trailing newline */
1063
if(len > 0 and passwordbuffer[len-1] == '\n'){
1064
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1065
len--;
1066
}
1067
bret = print_out_password(passwordbuffer, len);
920
1068
if(not bret){
921
1069
perror("print_out_password");
922
1070
exitstatus = EXIT_FAILURE;
929
1077
perror("sigaction");
930
1078
exitstatus = EXIT_FAILURE;
931
1079
}
932
1080
933
1081
if(custom_argv != NULL){
934
for(char **arg = custom_argv; *arg != NULL; arg++){
1082
for(char **arg = custom_argv+1; *arg != NULL; arg++){
935
1083
free(*arg);
936
1084
}
937
1085
free(custom_argv);
938
1086
}
939
free_plugin_list(plugin_list);
940
1087
941
1088
if(dir != NULL){
942
1089
closedir(dir);
943
1090
}
944
1091
945
/* Free the process list and kill the processes */
946
for(process *next; process_list != NULL; process_list = next){
947
next = process_list->next;
948
close(process_list->fd);
949
ret = kill(process_list->pid, SIGTERM);
950
if(ret == -1 and errno != ESRCH){
951
/* set-uid proccesses migth not get closed */
952
perror("kill");
1092
/* Kill the processes */
1093
for(plugin *p = plugin_list; p != NULL; p = p->next){
1094
if(p->pid != 0){
1095
close(p->fd);
1096
ret = kill(p->pid, SIGTERM);
1097
if(ret == -1 and errno != ESRCH){
1098
/* Set-uid proccesses might not get closed */
1099
perror("kill");
1100
}
953
1101
}
954
free(process_list->buffer);
955
free(process_list);
956
1102
}
957
1103
958
1104
/* Wait for any remaining child processes to terminate */
963
1109
perror("wait");
964
1110
}
965
1111
1112
free_plugin_list();
1113
1114
free(plugindir);
1115
free(argfile);
1116
966
1117
return exitstatus;
967
1118
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0