To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 237.2.19
- compare with another revision
- download diff
- download tarball
- view history from revision 237.2.19
- Committer: Teddy Hogeborn
- Date: 2009-05-17 00:50:09 UTC
- mto: (24.1.170 mandos) (237.4.29 release)
- mto: This revision was merged to the branch mainline in revision 343.
- Revision ID: teddy@fukt.bsnet.se-20090517005009-c0iptxampo6nf177
* initramfs-tools-hook-conf: Security bug fix: Add code to handle
being called by "mkinitramfs-kpkg"
instead of "update-initramfs".
being called by "mkinitramfs-kpkg"
instead of "update-initramfs".
- 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,
63
SIG_UNBLOCK, kill() */
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
64
67
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
65
69
66
70
#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";
71
72
#define PDIR "/lib/mandos/plugins.d"
73
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
75
const char *argp_program_version = "plugin-runner " VERSION;
70
76
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
77
72
struct process;
73
74
typedef struct process{
78
typedef struct plugin{
79
char *name; /* can be NULL or any plugin name */
80
char **argv;
81
int argc;
82
char **environ;
83
int envc;
84
bool disabled;
85
86
/* Variables used for running processes*/
75
87
pid_t pid;
76
88
int fd;
77
89
char *buffer;
78
90
size_t buffer_size;
79
91
size_t buffer_length;
80
92
bool eof;
81
bool completed;
93
volatile sig_atomic_t completed;
82
94
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
char **environ;
91
int envc;
92
bool disabled;
93
95
struct plugin *next;
94
96
} plugin;
95
97
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))){
98
static plugin *plugin_list = NULL;
99
100
/* Gets an existing plugin based on name,
101
or if none is found, creates a new one */
102
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
if((p->name == name)
106
or (p->name and name and (strcmp(p->name, name) == 0))){
100
107
return p;
101
108
}
102
109
}
103
110
/* Create a new plugin */
104
111
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
112
if(new_plugin == NULL){
106
113
return NULL;
107
114
}
108
115
char *copy_name = NULL;
109
116
if(name != NULL){
110
117
copy_name = strdup(name);
111
118
if(copy_name == NULL){
119
free(new_plugin);
112
120
return NULL;
113
121
}
114
122
}
115
123
116
*new_plugin = (plugin) { .name = copy_name,
117
.argc = 1,
118
.envc = 0,
119
.disabled = false,
120
.next = *plugin_list };
124
*new_plugin = (plugin){ .name = copy_name,
125
.argc = 1,
126
.disabled = false,
127
.next = plugin_list };
121
128
122
129
new_plugin->argv = malloc(sizeof(char *) * 2);
123
if (new_plugin->argv == NULL){
130
if(new_plugin->argv == NULL){
124
131
free(copy_name);
125
132
free(new_plugin);
126
133
return NULL;
127
134
}
128
135
new_plugin->argv[0] = copy_name;
129
136
new_plugin->argv[1] = NULL;
130
137
131
138
new_plugin->environ = malloc(sizeof(char *));
132
139
if(new_plugin->environ == NULL){
133
140
free(copy_name);
136
143
return NULL;
137
144
}
138
145
new_plugin->environ[0] = NULL;
146
139
147
/* Append the new plugin to the list */
140
*plugin_list = new_plugin;
148
plugin_list = new_plugin;
141
149
return new_plugin;
142
150
}
143
151
173
181
}
174
182
175
183
/* Add to a plugin's environment */
176
static bool add_environment(plugin *p, const char *def){
184
static bool add_environment(plugin *p, const char *def, bool replace){
177
185
if(p == NULL){
178
186
return false;
179
187
}
188
/* namelen = length of name of environment variable */
189
size_t namelen = (size_t)(strchrnul(def, '=') - def);
190
/* Search for this environment variable */
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
193
/* It already exists */
194
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
196
if(new == NULL){
197
return false;
198
}
199
*e = new;
200
strcpy(*e, def);
201
}
202
return true;
203
}
204
}
180
205
return add_to_char_array(def, &(p->environ), &(p->envc));
181
206
}
182
207
183
184
208
/*
185
209
* Based on the example in the GNU LibC manual chapter 13.13 "File
186
210
* Descriptor Flags".
187
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
188
212
*/
189
static int set_cloexec_flag(int fd)
190
{
213
static int set_cloexec_flag(int fd){
191
214
int ret = fcntl(fd, F_GETFD, 0);
192
215
/* If reading the flags failed, return error indication now. */
193
216
if(ret < 0){
197
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
198
221
}
199
222
200
process *process_list = NULL;
201
223
202
/* Mark processes as completed when it exits, and save its exit
224
/* Mark processes as completed when they exit, and save their exit
203
225
status. */
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
226
static void handle_sigchld(__attribute__((unused)) int sig){
227
int old_errno = errno;
206
228
while(true){
229
plugin *proc = plugin_list;
207
230
int status;
208
231
pid_t pid = waitpid(-1, &status, WNOHANG);
209
232
if(pid == 0){
233
/* Only still running child processes */
210
234
break;
211
235
}
212
236
if(pid == -1){
213
if (errno != ECHILD){
214
perror("waitpid");
237
if(errno == ECHILD){
238
/* No child processes */
239
break;
215
240
}
216
return;
241
perror("waitpid");
217
242
}
218
243
244
/* A child exited, find it in process_list */
219
245
while(proc != NULL and proc->pid != pid){
220
246
proc = proc->next;
221
247
}
224
250
continue;
225
251
}
226
252
proc->status = status;
227
proc->completed = true;
253
proc->completed = 1;
228
254
}
255
errno = old_errno;
229
256
}
230
257
231
bool print_out_password(const char *buffer, size_t length){
258
/* Prints out a password to stdout */
259
static bool print_out_password(const char *buffer, size_t length){
232
260
ssize_t ret;
233
if(length>0 and buffer[length-1] == '\n'){
234
length--;
235
}
236
261
for(size_t written = 0; written < length; written += (size_t)ret){
237
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
238
263
length - written));
243
268
return true;
244
269
}
245
270
246
char **add_to_argv(char **argv, int *argc, char *arg){
247
if (argv == NULL){
248
*argc = 1;
249
argv = malloc(sizeof(char*) * 2);
250
if(argv == NULL){
251
return NULL;
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
252
295
}
253
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
254
argv[1] = NULL;
255
}
256
*argc += 1;
257
argv = realloc(argv, sizeof(char *)
258
* ((unsigned int) *argc + 1));
259
if(argv == NULL){
260
return NULL;
261
}
262
argv[*argc-1] = arg;
263
argv[*argc] = NULL;
264
return argv;
296
}
297
298
free(plugin_node);
265
299
}
266
300
267
static void free_plugin_list(plugin *plugin_list){
268
for(plugin *next; plugin_list != NULL; plugin_list = next){
269
next = plugin_list->next;
270
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
271
free(*arg);
272
}
273
free(plugin_list->argv);
274
for(char **env = plugin_list->environ; *env != NULL; env++){
275
free(*env);
276
}
277
free(plugin_list->environ);
278
free(plugin_list);
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
279
304
}
280
305
}
281
306
282
307
int main(int argc, char *argv[]){
283
const char *plugindir = "/lib/mandos/plugins.d";
284
const char *argfile = ARGFILE;
308
char *plugindir = NULL;
309
char *argfile = NULL;
285
310
FILE *conffp;
286
311
size_t d_name_len;
287
312
DIR *dir = NULL;
289
314
struct stat st;
290
315
fd_set rfds_all;
291
316
int ret, maxfd = 0;
317
ssize_t sret;
318
intmax_t tmpmax;
292
319
uid_t uid = 65534;
293
320
gid_t gid = 65534;
294
321
bool debug = false;
319
346
{ .name = "global-options", .key = 'g',
320
347
.arg = "OPTION[,OPTION[,...]]",
321
348
.doc = "Options passed to all plugins" },
322
{ .name = "global-envs", .key = 'e',
349
{ .name = "global-env", .key = 'G',
323
350
.arg = "VAR=value",
324
351
.doc = "Environment variable passed to all plugins" },
325
352
{ .name = "options-for", .key = 'o',
326
353
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
327
354
.doc = "Options passed only to specified plugin" },
328
{ .name = "envs-for", .key = 'f',
355
{ .name = "env-for", .key = 'E',
329
356
.arg = "PLUGIN:ENV=value",
330
357
.doc = "Environment variable passed to specified plugin" },
331
358
{ .name = "disable", .key = 'd',
332
359
.arg = "PLUGIN",
333
360
.doc = "Disable a specific plugin", .group = 1 },
361
{ .name = "enable", .key = 'e',
362
.arg = "PLUGIN",
363
.doc = "Enable a specific plugin", .group = 1 },
334
364
{ .name = "plugin-dir", .key = 128,
335
365
.arg = "DIRECTORY",
336
366
.doc = "Specify a different plugin directory", .group = 2 },
337
{ .name = "userid", .key = 129,
338
.arg = "ID", .flags = 0,
339
.doc = "User ID the plugins will run as", .group = 2 },
340
{ .name = "groupid", .key = 130,
341
.arg = "ID", .flags = 0,
342
.doc = "Group ID the plugins will run as", .group = 2 },
343
{ .name = "debug", .key = 131,
344
.doc = "Debug mode", .group = 3 },
367
{ .name = "config-file", .key = 129,
368
.arg = "FILE",
369
.doc = "Specify a different configuration file", .group = 2 },
370
{ .name = "userid", .key = 130,
371
.arg = "ID", .flags = 0,
372
.doc = "User ID the plugins will run as", .group = 3 },
373
{ .name = "groupid", .key = 131,
374
.arg = "ID", .flags = 0,
375
.doc = "Group ID the plugins will run as", .group = 3 },
376
{ .name = "debug", .key = 132,
377
.doc = "Debug mode", .group = 4 },
345
378
{ .name = NULL }
346
379
};
347
380
348
error_t parse_opt (int key, char *arg, struct argp_state *state) {
349
/* Get the INPUT argument from `argp_parse', which we know is a
350
pointer to our plugin list pointer. */
351
plugin **plugins = state->input;
352
switch (key) {
353
case 'g':
354
if (arg != NULL){
355
char *p;
356
while((p = strsep(&arg, ",")) != NULL){
357
if(p[0] == '\0'){
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
383
char *tmp;
384
switch(key){
385
case 'g': /* --global-options */
386
if(arg != NULL){
387
char *plugin_option;
388
while((plugin_option = strsep(&arg, ",")) != NULL){
389
if(plugin_option[0] == '\0'){
358
390
continue;
359
391
}
360
if(not add_argument(getplugin(NULL, plugins), p)){
392
if(not add_argument(getplugin(NULL), plugin_option)){
361
393
perror("add_argument");
362
394
return ARGP_ERR_UNKNOWN;
363
395
}
364
396
}
365
397
}
366
398
break;
367
case 'e':
399
case 'G': /* --global-env */
368
400
if(arg == NULL){
369
401
break;
370
402
}
371
{
372
char *envdef = strdup(arg);
373
if(envdef == NULL){
374
break;
375
}
376
if(not add_environment(getplugin(NULL, plugins), envdef)){
377
perror("add_environment");
378
}
403
if(not add_environment(getplugin(NULL), arg, true)){
404
perror("add_environment");
379
405
}
380
406
break;
381
case 'o':
382
if (arg != NULL){
383
char *p_name = strsep(&arg, ":");
384
if(p_name[0] == '\0'){
385
break;
386
}
387
char *opt = strsep(&arg, ":");
388
if(opt[0] == '\0'){
389
break;
390
}
391
if(opt != NULL){
392
char *p;
393
while((p = strsep(&opt, ",")) != NULL){
394
if(p[0] == '\0'){
395
continue;
396
}
397
if(not add_argument(getplugin(p_name, plugins), p)){
398
perror("add_argument");
399
return ARGP_ERR_UNKNOWN;
400
}
407
case 'o': /* --options-for */
408
if(arg != NULL){
409
char *plugin_name = strsep(&arg, ":");
410
if(plugin_name[0] == '\0'){
411
break;
412
}
413
char *plugin_option;
414
while((plugin_option = strsep(&arg, ",")) != NULL){
415
if(not add_argument(getplugin(plugin_name), plugin_option)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
401
418
}
402
419
}
403
420
}
404
421
break;
405
case 'f':
422
case 'E': /* --env-for */
406
423
if(arg == NULL){
407
424
break;
408
425
}
411
428
if(envdef == NULL){
412
429
break;
413
430
}
414
char *p_name = strndup(arg, (size_t) (envdef-arg));
415
if(p_name == NULL){
416
break;
417
}
418
envdef++;
419
if(not add_environment(getplugin(p_name, plugins), envdef)){
431
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
420
433
perror("add_environment");
421
434
}
422
435
}
423
436
break;
424
case 'd':
425
if (arg != NULL){
426
plugin *p = getplugin(arg, plugins);
437
case 'd': /* --disable */
438
if(arg != NULL){
439
plugin *p = getplugin(arg);
427
440
if(p == NULL){
428
441
return ARGP_ERR_UNKNOWN;
429
442
}
430
443
p->disabled = true;
431
444
}
432
445
break;
433
case 128:
434
plugindir = arg;
435
break;
436
case 129:
437
uid = (uid_t)strtol(arg, NULL, 10);
438
break;
439
case 130:
440
gid = (gid_t)strtol(arg, NULL, 10);
441
break;
442
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
errno = 0;
467
tmpmax = strtoimax(arg, &tmp, 10);
468
if(errno != 0 or tmp == arg or *tmp != '\0'
469
or tmpmax != (uid_t)tmpmax){
470
fprintf(stderr, "Bad user ID number: \"%s\", using %"
471
PRIdMAX "\n", arg, (intmax_t)uid);
472
} else {
473
uid = (uid_t)tmpmax;
474
}
475
break;
476
case 131: /* --groupid */
477
errno = 0;
478
tmpmax = strtoimax(arg, &tmp, 10);
479
if(errno != 0 or tmp == arg or *tmp != '\0'
480
or tmpmax != (gid_t)tmpmax){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
gid = (gid_t)tmpmax;
485
}
486
break;
487
case 132: /* --debug */
443
488
debug = true;
444
489
break;
445
case ARGP_KEY_ARG:
446
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
447
break;
448
case ARGP_KEY_END:
449
break;
450
default:
451
return ARGP_ERR_UNKNOWN;
452
}
453
return 0;
454
}
455
456
plugin *plugin_list = NULL;
457
458
struct argp argp = { .options = options, .parser = parse_opt,
459
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
490
/*
491
* When adding more options before this line, remember to also add a
492
* "case" to the "parse_opt_config_file" function below.
493
*/
494
case ARGP_KEY_ARG:
495
/* Cryptsetup always passes an argument, which is an empty
496
string if "none" was specified in /etc/crypttab. So if
497
argument was empty, we ignore it silently. */
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
500
}
501
break;
502
case ARGP_KEY_END:
503
break;
504
default:
505
return ARGP_ERR_UNKNOWN;
506
}
507
return 0;
508
}
509
510
/* This option parser is the same as parse_opt() above, except it
511
ignores everything but the --config-file option. */
512
error_t parse_opt_config_file(int key, char *arg,
513
__attribute__((unused))
514
struct argp_state *state){
515
switch(key){
516
case 'g': /* --global-options */
517
case 'G': /* --global-env */
518
case 'o': /* --options-for */
519
case 'E': /* --env-for */
520
case 'd': /* --disable */
521
case 'e': /* --enable */
522
case 128: /* --plugin-dir */
523
break;
524
case 129: /* --config-file */
525
free(argfile);
526
argfile = strdup(arg);
527
if(argfile == NULL){
528
perror("strdup");
529
}
530
break;
531
case 130: /* --userid */
532
case 131: /* --groupid */
533
case 132: /* --debug */
534
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
536
break;
537
default:
538
return ARGP_ERR_UNKNOWN;
539
}
540
return 0;
541
}
542
543
struct argp argp = { .options = options,
544
.parser = parse_opt_config_file,
545
.args_doc = "",
460
546
.doc = "Mandos plugin runner -- Run plugins" };
461
547
462
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
463
if (ret == ARGP_ERR_UNKNOWN){
548
/* Parse using parse_opt_config_file() in order to get the custom
549
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
464
552
fprintf(stderr, "Unknown error while parsing arguments\n");
465
553
exitstatus = EXIT_FAILURE;
466
554
goto fallback;
467
555
}
468
469
conffp = fopen(argfile, "r");
556
557
/* Reset to the normal argument parser */
558
argp.parser = parse_opt;
559
560
/* Open the configfile if available */
561
if(argfile == NULL){
562
conffp = fopen(AFILE, "r");
563
} else {
564
conffp = fopen(argfile, "r");
565
}
470
566
if(conffp != NULL){
471
567
char *org_line = NULL;
472
568
char *p, *arg, *new_arg, *line;
473
569
size_t size = 0;
474
ssize_t sret;
475
570
const char whitespace_delims[] = " \r\t\f\v\n";
476
571
const char comment_delim[] = "#";
477
572
573
custom_argc = 1;
574
custom_argv = malloc(sizeof(char*) * 2);
575
if(custom_argv == NULL){
576
perror("malloc");
577
exitstatus = EXIT_FAILURE;
578
goto fallback;
579
}
580
custom_argv[0] = argv[0];
581
custom_argv[1] = NULL;
582
583
/* for each line in the config file, strip whitespace and ignore
584
commented text */
478
585
while(true){
479
586
sret = getline(&org_line, &size, conffp);
480
587
if(sret == -1){
481
588
break;
482
589
}
483
590
484
591
line = org_line;
485
592
arg = strsep(&line, comment_delim);
486
593
while((p = strsep(&arg, whitespace_delims)) != NULL){
488
595
continue;
489
596
}
490
597
new_arg = strdup(p);
491
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
492
if (custom_argv == NULL){
493
perror("add_to_argv");
494
exitstatus = EXIT_FAILURE;
495
goto fallback;
496
}
598
if(new_arg == NULL){
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
601
free(org_line);
602
goto fallback;
603
}
604
605
custom_argc += 1;
606
custom_argv = realloc(custom_argv, sizeof(char *)
607
* ((unsigned int) custom_argc + 1));
608
if(custom_argv == NULL){
609
perror("realloc");
610
exitstatus = EXIT_FAILURE;
611
free(org_line);
612
goto fallback;
613
}
614
custom_argv[custom_argc-1] = new_arg;
615
custom_argv[custom_argc] = NULL;
497
616
}
498
617
}
499
618
free(org_line);
500
} else{
619
} else {
501
620
/* Check for harmful errors and go to fallback. Other errors might
502
621
not affect opening plugins */
503
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
504
623
perror("fopen");
505
624
exitstatus = EXIT_FAILURE;
506
625
goto fallback;
507
626
}
508
627
}
509
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
510
630
if(custom_argv != NULL){
511
custom_argv[0] = argv[0];
512
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
513
if (ret == ARGP_ERR_UNKNOWN){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
514
634
fprintf(stderr, "Unknown error while parsing arguments\n");
515
635
exitstatus = EXIT_FAILURE;
516
636
goto fallback;
517
637
}
518
638
}
519
639
640
/* Parse actual command line arguments, to let them override the
641
config file */
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
646
goto fallback;
647
}
648
520
649
if(debug){
521
650
for(plugin *p = plugin_list; p != NULL; p=p->next){
522
651
fprintf(stderr, "Plugin: %s has %d arguments\n",
524
653
for(char **a = p->argv; *a != NULL; a++){
525
654
fprintf(stderr, "\tArg: %s\n", *a);
526
655
}
527
fprintf(stderr, "...and %u environment variables\n", p->envc);
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
528
657
for(char **a = p->environ; *a != NULL; a++){
529
658
fprintf(stderr, "\t%s\n", *a);
530
659
}
531
660
}
532
661
}
533
662
663
/* Strip permissions down to nobody */
664
setgid(gid);
665
if(ret == -1){
666
perror("setgid");
667
}
534
668
ret = setuid(uid);
535
if (ret == -1){
669
if(ret == -1){
536
670
perror("setuid");
537
671
}
538
672
539
setgid(gid);
540
if (ret == -1){
541
perror("setgid");
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
542
677
}
543
678
544
dir = opendir(plugindir);
545
679
if(dir == NULL){
546
680
perror("Could not open plugin dir");
547
681
exitstatus = EXIT_FAILURE;
563
697
564
698
FD_ZERO(&rfds_all);
565
699
700
/* Read and execute any executable in the plugin directory*/
566
701
while(true){
567
702
dirst = readdir(dir);
568
703
569
// All directory entries have been processed
704
/* All directory entries have been processed */
570
705
if(dirst == NULL){
571
if (errno == EBADF){
706
if(errno == EBADF){
572
707
perror("readdir");
573
708
exitstatus = EXIT_FAILURE;
574
709
goto fallback;
578
713
579
714
d_name_len = strlen(dirst->d_name);
580
715
581
// Ignore dotfiles, backup files and other junk
716
/* Ignore dotfiles, backup files and other junk */
582
717
{
583
718
bool bad_name = false;
584
719
586
721
587
722
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
588
723
".dpkg-old",
724
".dpkg-bak",
589
725
".dpkg-divert", NULL };
590
726
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
591
727
size_t pre_len = strlen(*pre);
599
735
break;
600
736
}
601
737
}
602
603
738
if(bad_name){
604
739
continue;
605
740
}
606
607
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
608
742
size_t suf_len = strlen(*suf);
609
743
if((d_name_len >= suf_len)
622
756
continue;
623
757
}
624
758
}
625
759
626
760
char *filename;
627
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
761
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
763
} else {
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
765
}
628
766
if(ret < 0){
629
767
perror("asprintf");
630
768
continue;
631
769
}
632
770
633
771
ret = stat(filename, &st);
634
if (ret == -1){
772
if(ret == -1){
635
773
perror("stat");
636
774
free(filename);
637
775
continue;
638
776
}
639
777
640
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
778
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
641
780
if(debug){
642
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
643
782
" with bad type or mode\n", filename);
645
784
free(filename);
646
785
continue;
647
786
}
648
plugin *p = getplugin(dirst->d_name, &plugin_list);
787
788
plugin *p = getplugin(dirst->d_name);
649
789
if(p == NULL){
650
790
perror("getplugin");
651
791
free(filename);
661
801
}
662
802
{
663
803
/* Add global arguments to argument list for this plugin */
664
plugin *g = getplugin(NULL, &plugin_list);
804
plugin *g = getplugin(NULL);
665
805
if(g != NULL){
666
806
for(char **a = g->argv + 1; *a != NULL; a++){
667
807
if(not add_argument(p, *a)){
670
810
}
671
811
/* Add global environment variables */
672
812
for(char **e = g->environ; *e != NULL; e++){
673
if(not add_environment(p, *e)){
813
if(not add_environment(p, *e, false)){
674
814
perror("add_environment");
675
815
}
676
816
}
681
821
process, too. */
682
822
if(p->environ[0] != NULL){
683
823
for(char **e = environ; *e != NULL; e++){
684
char *copy = strdup(*e);
685
if(copy == NULL){
686
perror("strdup");
687
continue;
688
}
689
if(not add_environment(p, copy)){
824
if(not add_environment(p, *e, false)){
690
825
perror("add_environment");
691
826
}
692
827
}
694
829
695
830
int pipefd[2];
696
831
ret = pipe(pipefd);
697
if (ret == -1){
832
if(ret == -1){
698
833
perror("pipe");
699
834
exitstatus = EXIT_FAILURE;
700
835
goto fallback;
701
836
}
837
/* Ask OS to automatic close the pipe on exec */
702
838
ret = set_cloexec_flag(pipefd[0]);
703
839
if(ret < 0){
704
840
perror("set_cloexec_flag");
712
848
goto fallback;
713
849
}
714
850
/* Block SIGCHLD until process is safely in process list */
715
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
716
852
if(ret < 0){
717
853
perror("sigprocmask");
718
854
exitstatus = EXIT_FAILURE;
719
855
goto fallback;
720
856
}
721
// Starting a new process to be watched
857
/* Starting a new process to be watched */
722
858
pid_t pid = fork();
723
859
if(pid == -1){
724
860
perror("fork");
732
868
perror("sigaction");
733
869
_exit(EXIT_FAILURE);
734
870
}
735
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
736
872
if(ret < 0){
737
873
perror("sigprocmask");
738
874
_exit(EXIT_FAILURE);
739
875
}
740
876
741
877
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
742
878
if(ret == -1){
743
879
perror("dup2");
762
898
}
763
899
/* no return */
764
900
}
765
/* parent process */
901
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
766
903
free(filename);
767
close(pipefd[1]); /* close unused write end of pipe */
768
process *new_process = malloc(sizeof(process));
769
if (new_process == NULL){
770
perror("malloc");
771
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
904
plugin *new_plugin = getplugin(dirst->d_name);
905
if(new_plugin == NULL){
906
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
772
908
if(ret < 0){
773
perror("sigprocmask");
909
perror("sigprocmask");
774
910
}
775
911
exitstatus = EXIT_FAILURE;
776
912
goto fallback;
777
913
}
778
914
779
*new_process = (struct process){ .pid = pid,
780
.fd = pipefd[0],
781
.next = process_list };
782
// List handling
783
process_list = new_process;
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
917
784
918
/* Unblock SIGCHLD so signal handler can be run if this process
785
919
has already completed */
786
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
787
921
if(ret < 0){
788
922
perror("sigprocmask");
789
923
exitstatus = EXIT_FAILURE;
790
924
goto fallback;
791
925
}
792
926
793
FD_SET(new_process->fd, &rfds_all);
927
FD_SET(new_plugin->fd, &rfds_all);
794
928
795
if (maxfd < new_process->fd){
796
maxfd = new_process->fd;
929
if(maxfd < new_plugin->fd){
930
maxfd = new_plugin->fd;
797
931
}
798
799
932
}
800
933
801
free_plugin_list(plugin_list);
802
plugin_list = NULL;
803
804
934
closedir(dir);
805
935
dir = NULL;
806
807
if (process_list == NULL){
808
fprintf(stderr, "No plugin processes started. Incorrect plugin"
809
" directory?\n");
810
process_list = NULL;
936
free_plugin(getplugin(NULL));
937
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
if(p->pid != 0){
940
break;
941
}
942
if(p->next == NULL){
943
fprintf(stderr, "No plugin processes started. Incorrect plugin"
944
" directory?\n");
945
free_plugin_list();
946
}
811
947
}
812
while(process_list){
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
813
951
fd_set rfds = rfds_all;
814
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
815
if (select_ret == -1){
953
if(select_ret == -1){
816
954
perror("select");
817
955
exitstatus = EXIT_FAILURE;
818
956
goto fallback;
819
957
}
820
958
/* OK, now either a process completed, or something can be read
821
959
from one of them */
822
for(process *proc = process_list; proc ; proc = proc->next){
960
for(plugin *proc = plugin_list; proc != NULL;){
823
961
/* Is this process completely done? */
824
if(proc->eof and proc->completed){
962
if(proc->completed and proc->eof){
825
963
/* Only accept the plugin output if it exited cleanly */
826
964
if(not WIFEXITED(proc->status)
827
965
or WEXITSTATUS(proc->status) != 0){
828
966
/* Bad exit by plugin */
967
829
968
if(debug){
830
969
if(WIFEXITED(proc->status)){
831
fprintf(stderr, "Plugin %u exited with status %d\n",
832
(unsigned int) (proc->pid),
970
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
971
" status %d\n", proc->name,
972
(intmax_t) (proc->pid),
833
973
WEXITSTATUS(proc->status));
834
} else if(WIFSIGNALED(proc->status)) {
835
fprintf(stderr, "Plugin %u killed by signal %d\n",
836
(unsigned int) (proc->pid),
974
} else if(WIFSIGNALED(proc->status)){
975
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
976
" signal %d\n", proc->name,
977
(intmax_t) (proc->pid),
837
978
WTERMSIG(proc->status));
838
979
} else if(WCOREDUMP(proc->status)){
839
fprintf(stderr, "Plugin %d dumped core\n",
840
(unsigned int) (proc->pid));
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
981
" core\n", proc->name, (intmax_t) (proc->pid));
841
982
}
842
983
}
984
843
985
/* Remove the plugin */
844
986
FD_CLR(proc->fd, &rfds_all);
987
845
988
/* Block signal while modifying process_list */
846
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
847
990
if(ret < 0){
848
991
perror("sigprocmask");
849
992
exitstatus = EXIT_FAILURE;
850
993
goto fallback;
851
994
}
852
/* Delete this process entry from the list */
853
if(process_list == proc){
854
/* First one - simple */
855
process_list = proc->next;
856
} else {
857
/* Second one or later */
858
for(process *p = process_list; p != NULL; p = p->next){
859
if(p->next == proc){
860
p->next = proc->next;
861
break;
862
}
863
}
864
}
995
996
plugin *next_plugin = proc->next;
997
free_plugin(proc);
998
proc = next_plugin;
999
865
1000
/* We are done modifying process list, so unblock signal */
866
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
867
NULL);
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
868
1003
if(ret < 0){
869
1004
perror("sigprocmask");
870
}
871
free(proc->buffer);
872
free(proc);
873
/* We deleted this process from the list, so we can't go
874
proc->next. Therefore, start over from the beginning of
875
the process list */
876
break;
1005
exitstatus = EXIT_FAILURE;
1006
goto fallback;
1007
}
1008
1009
if(plugin_list == NULL){
1010
break;
1011
}
1012
1013
continue;
877
1014
}
1015
878
1016
/* This process exited nicely, so print its buffer */
879
880
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1017
1018
bool bret = print_out_password(proc->buffer,
1019
proc->buffer_length);
881
1020
if(not bret){
882
1021
perror("print_out_password");
883
1022
exitstatus = EXIT_FAILURE;
884
1023
}
885
1024
goto fallback;
886
1025
}
1026
887
1027
/* This process has not completed. Does it have any output? */
888
1028
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
889
1029
/* This process had nothing to say at this time */
1030
proc = proc->next;
890
1031
continue;
891
1032
}
892
1033
/* Before reading, make the process' data buffer large enough */
893
1034
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
894
1035
proc->buffer = realloc(proc->buffer, proc->buffer_size
895
1036
+ (size_t) BUFFER_SIZE);
896
if (proc->buffer == NULL){
1037
if(proc->buffer == NULL){
897
1038
perror("malloc");
898
1039
exitstatus = EXIT_FAILURE;
899
1040
goto fallback;
901
1042
proc->buffer_size += BUFFER_SIZE;
902
1043
}
903
1044
/* Read from the process */
904
ret = read(proc->fd, proc->buffer + proc->buffer_length,
905
BUFFER_SIZE);
906
if(ret < 0){
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1047
if(sret < 0){
907
1048
/* Read error from this process; ignore the error */
1049
proc = proc->next;
908
1050
continue;
909
1051
}
910
if(ret == 0){
1052
if(sret == 0){
911
1053
/* got EOF */
912
1054
proc->eof = true;
913
1055
} else {
914
proc->buffer_length += (size_t) ret;
1056
proc->buffer_length += (size_t) sret;
915
1057
}
916
1058
}
917
1059
}
918
919
1060
1061
920
1062
fallback:
921
1063
922
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
923
/* Fallback if all plugins failed, none are found or an error occured */
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1065
/* Fallback if all plugins failed, none are found or an error
1066
occured */
924
1067
bool bret;
925
1068
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
926
1069
char *passwordbuffer = getpass("Password: ");
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1070
size_t len = strlen(passwordbuffer);
1071
/* Strip trailing newline */
1072
if(len > 0 and passwordbuffer[len-1] == '\n'){
1073
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1074
len--;
1075
}
1076
bret = print_out_password(passwordbuffer, len);
928
1077
if(not bret){
929
1078
perror("print_out_password");
930
1079
exitstatus = EXIT_FAILURE;
937
1086
perror("sigaction");
938
1087
exitstatus = EXIT_FAILURE;
939
1088
}
940
1089
941
1090
if(custom_argv != NULL){
942
for(char **arg = custom_argv; *arg != NULL; arg++){
1091
for(char **arg = custom_argv+1; *arg != NULL; arg++){
943
1092
free(*arg);
944
1093
}
945
1094
free(custom_argv);
946
1095
}
947
free_plugin_list(plugin_list);
948
1096
949
1097
if(dir != NULL){
950
1098
closedir(dir);
951
1099
}
952
1100
953
/* Free the process list and kill the processes */
954
for(process *next; process_list != NULL; process_list = next){
955
next = process_list->next;
956
close(process_list->fd);
957
ret = kill(process_list->pid, SIGTERM);
958
if(ret == -1 and errno != ESRCH){
959
/* set-uid proccesses migth not get closed */
960
perror("kill");
1101
/* Kill the processes */
1102
for(plugin *p = plugin_list; p != NULL; p = p->next){
1103
if(p->pid != 0){
1104
close(p->fd);
1105
ret = kill(p->pid, SIGTERM);
1106
if(ret == -1 and errno != ESRCH){
1107
/* Set-uid proccesses might not get closed */
1108
perror("kill");
1109
}
961
1110
}
962
free(process_list->buffer);
963
free(process_list);
964
1111
}
965
1112
966
1113
/* Wait for any remaining child processes to terminate */
971
1118
perror("wait");
972
1119
}
973
1120
1121
free_plugin_list();
1122
1123
free(plugindir);
1124
free(argfile);
1125
974
1126
return exitstatus;
975
1127
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0