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- 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,
61
62
#include <signal.h> /* struct sigaction, sigemptyset(),
62
63
sigaddset(), sigaction(),
63
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
65
67
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
66
69
67
70
#define BUFFER_SIZE 256
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
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;
71
76
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
77
73
struct process;
74
75
typedef struct process{
76
pid_t pid;
77
int fd;
78
char *buffer;
79
size_t buffer_size;
80
size_t buffer_length;
81
bool eof;
82
volatile bool completed;
83
volatile int status;
84
struct process *next;
85
} process;
86
87
78
typedef struct plugin{
88
79
char *name; /* can be NULL or any plugin name */
89
80
char **argv;
91
82
char **environ;
92
83
int envc;
93
84
bool disabled;
85
86
/* Variables used for running processes*/
87
pid_t pid;
88
int fd;
89
char *buffer;
90
size_t buffer_size;
91
size_t buffer_length;
92
bool eof;
93
volatile sig_atomic_t completed;
94
int status;
94
95
struct plugin *next;
95
96
} plugin;
96
97
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
99
if ((p->name == name)
100
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))){
101
107
return p;
102
108
}
103
109
}
104
110
/* Create a new plugin */
105
111
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
112
if(new_plugin == NULL){
107
113
return NULL;
108
114
}
109
115
char *copy_name = NULL;
110
116
if(name != NULL){
111
117
copy_name = strdup(name);
112
118
if(copy_name == NULL){
119
free(new_plugin);
113
120
return NULL;
114
121
}
115
122
}
116
123
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
124
*new_plugin = (plugin){ .name = copy_name,
125
.argc = 1,
126
.disabled = false,
127
.next = plugin_list };
122
128
123
129
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
130
if(new_plugin->argv == NULL){
125
131
free(copy_name);
126
132
free(new_plugin);
127
133
return NULL;
128
134
}
129
135
new_plugin->argv[0] = copy_name;
130
136
new_plugin->argv[1] = NULL;
131
137
132
138
new_plugin->environ = malloc(sizeof(char *));
133
139
if(new_plugin->environ == NULL){
134
140
free(copy_name);
137
143
return NULL;
138
144
}
139
145
new_plugin->environ[0] = NULL;
146
140
147
/* Append the new plugin to the list */
141
*plugin_list = new_plugin;
148
plugin_list = new_plugin;
142
149
return new_plugin;
143
150
}
144
151
174
181
}
175
182
176
183
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
184
static bool add_environment(plugin *p, const char *def, bool replace){
178
185
if(p == NULL){
179
186
return false;
180
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
}
181
205
return add_to_char_array(def, &(p->environ), &(p->envc));
182
206
}
183
207
184
185
208
/*
186
209
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
210
* Descriptor Flags".
188
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
189
212
*/
190
static int set_cloexec_flag(int fd)
191
{
213
static int set_cloexec_flag(int fd){
192
214
int ret = fcntl(fd, F_GETFD, 0);
193
215
/* If reading the flags failed, return error indication now. */
194
216
if(ret < 0){
198
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
199
221
}
200
222
201
process *process_list = NULL;
202
223
203
224
/* Mark processes as completed when they exit, and save their exit
204
225
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
226
static void handle_sigchld(__attribute__((unused)) int sig){
227
int old_errno = errno;
206
228
while(true){
207
process *proc = process_list;
229
plugin *proc = plugin_list;
208
230
int status;
209
231
pid_t pid = waitpid(-1, &status, WNOHANG);
210
232
if(pid == 0){
212
234
break;
213
235
}
214
236
if(pid == -1){
215
if (errno != ECHILD){
216
perror("waitpid");
237
if(errno == ECHILD){
238
/* No child processes */
239
break;
217
240
}
218
/* No child processes */
219
break;
241
perror("waitpid");
220
242
}
221
243
222
244
/* A child exited, find it in process_list */
223
245
while(proc != NULL and proc->pid != pid){
224
246
proc = proc->next;
228
250
continue;
229
251
}
230
252
proc->status = status;
231
proc->completed = true;
253
proc->completed = 1;
232
254
}
255
errno = old_errno;
233
256
}
234
257
235
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){
236
260
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
261
for(size_t written = 0; written < length; written += (size_t)ret){
241
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
263
length - written));
247
268
return true;
248
269
}
249
270
250
static void free_plugin_list(plugin *plugin_list){
251
for(plugin *next; plugin_list != NULL; plugin_list = next){
252
next = plugin_list->next;
253
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
254
free(*arg);
255
}
256
free(plugin_list->argv);
257
for(char **env = plugin_list->environ; *env != NULL; env++){
258
free(*env);
259
}
260
free(plugin_list->environ);
261
free(plugin_list);
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
}
295
}
296
}
297
298
free(plugin_node);
299
}
300
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
262
304
}
263
305
}
264
306
265
307
int main(int argc, char *argv[]){
266
const char *plugindir = "/lib/mandos/plugins.d";
267
const char *argfile = ARGFILE;
308
char *plugindir = NULL;
309
char *argfile = NULL;
268
310
FILE *conffp;
269
311
size_t d_name_len;
270
312
DIR *dir = NULL;
272
314
struct stat st;
273
315
fd_set rfds_all;
274
316
int ret, maxfd = 0;
317
ssize_t sret;
318
intmax_t tmpmax;
275
319
uid_t uid = 65534;
276
320
gid_t gid = 65534;
277
321
bool debug = false;
302
346
{ .name = "global-options", .key = 'g',
303
347
.arg = "OPTION[,OPTION[,...]]",
304
348
.doc = "Options passed to all plugins" },
305
{ .name = "global-envs", .key = 'e',
349
{ .name = "global-env", .key = 'G',
306
350
.arg = "VAR=value",
307
351
.doc = "Environment variable passed to all plugins" },
308
352
{ .name = "options-for", .key = 'o',
309
353
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
310
354
.doc = "Options passed only to specified plugin" },
311
{ .name = "envs-for", .key = 'f',
355
{ .name = "env-for", .key = 'E',
312
356
.arg = "PLUGIN:ENV=value",
313
357
.doc = "Environment variable passed to specified plugin" },
314
358
{ .name = "disable", .key = 'd',
315
359
.arg = "PLUGIN",
316
360
.doc = "Disable a specific plugin", .group = 1 },
361
{ .name = "enable", .key = 'e',
362
.arg = "PLUGIN",
363
.doc = "Enable a specific plugin", .group = 1 },
317
364
{ .name = "plugin-dir", .key = 128,
318
365
.arg = "DIRECTORY",
319
366
.doc = "Specify a different plugin directory", .group = 2 },
320
{ .name = "userid", .key = 129,
321
.arg = "ID", .flags = 0,
322
.doc = "User ID the plugins will run as", .group = 2 },
323
{ .name = "groupid", .key = 130,
324
.arg = "ID", .flags = 0,
325
.doc = "Group ID the plugins will run as", .group = 2 },
326
{ .name = "debug", .key = 131,
327
.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 },
328
378
{ .name = NULL }
329
379
};
330
380
331
error_t parse_opt (int key, char *arg, struct argp_state *state) {
332
/* Get the INPUT argument from `argp_parse', which we know is a
333
pointer to our plugin list pointer. */
334
plugin **plugins = state->input;
335
switch (key) {
336
case 'g':
337
if (arg != NULL){
338
char *p;
339
while((p = strsep(&arg, ",")) != NULL){
340
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'){
341
390
continue;
342
391
}
343
if(not add_argument(getplugin(NULL, plugins), p)){
392
if(not add_argument(getplugin(NULL), plugin_option)){
344
393
perror("add_argument");
345
394
return ARGP_ERR_UNKNOWN;
346
395
}
347
396
}
348
397
}
349
398
break;
350
case 'e':
399
case 'G': /* --global-env */
351
400
if(arg == NULL){
352
401
break;
353
402
}
354
{
355
char *envdef = strdup(arg);
356
if(envdef == NULL){
357
break;
358
}
359
if(not add_environment(getplugin(NULL, plugins), envdef)){
360
perror("add_environment");
361
}
403
if(not add_environment(getplugin(NULL), arg, true)){
404
perror("add_environment");
362
405
}
363
406
break;
364
case 'o':
365
if (arg != NULL){
366
char *p_name = strsep(&arg, ":");
367
if(p_name[0] == '\0'){
368
break;
369
}
370
char *opt = strsep(&arg, ":");
371
if(opt[0] == '\0'){
372
break;
373
}
374
if(opt != NULL){
375
char *p;
376
while((p = strsep(&opt, ",")) != NULL){
377
if(p[0] == '\0'){
378
continue;
379
}
380
if(not add_argument(getplugin(p_name, plugins), p)){
381
perror("add_argument");
382
return ARGP_ERR_UNKNOWN;
383
}
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;
384
418
}
385
419
}
386
420
}
387
421
break;
388
case 'f':
422
case 'E': /* --env-for */
389
423
if(arg == NULL){
390
424
break;
391
425
}
394
428
if(envdef == NULL){
395
429
break;
396
430
}
397
char *p_name = strndup(arg, (size_t) (envdef-arg));
398
if(p_name == NULL){
399
break;
400
}
401
envdef++;
402
if(not add_environment(getplugin(p_name, plugins), envdef)){
431
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
403
433
perror("add_environment");
404
434
}
405
435
}
406
436
break;
407
case 'd':
408
if (arg != NULL){
409
plugin *p = getplugin(arg, plugins);
437
case 'd': /* --disable */
438
if(arg != NULL){
439
plugin *p = getplugin(arg);
410
440
if(p == NULL){
411
441
return ARGP_ERR_UNKNOWN;
412
442
}
413
443
p->disabled = true;
414
444
}
415
445
break;
416
case 128:
417
plugindir = arg;
418
break;
419
case 129:
420
uid = (uid_t)strtol(arg, NULL, 10);
421
break;
422
case 130:
423
gid = (gid_t)strtol(arg, NULL, 10);
424
break;
425
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 */
426
488
debug = true;
427
489
break;
428
case ARGP_KEY_ARG:
429
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
430
break;
431
case ARGP_KEY_END:
432
break;
433
default:
434
return ARGP_ERR_UNKNOWN;
435
}
436
return 0;
437
}
438
439
plugin *plugin_list = NULL;
440
441
struct argp argp = { .options = options, .parser = parse_opt,
442
.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 = "",
443
546
.doc = "Mandos plugin runner -- Run plugins" };
444
547
445
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
446
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){
447
552
fprintf(stderr, "Unknown error while parsing arguments\n");
448
553
exitstatus = EXIT_FAILURE;
449
554
goto fallback;
450
555
}
451
452
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
}
453
566
if(conffp != NULL){
454
567
char *org_line = NULL;
455
568
char *p, *arg, *new_arg, *line;
456
569
size_t size = 0;
457
ssize_t sret;
458
570
const char whitespace_delims[] = " \r\t\f\v\n";
459
571
const char comment_delim[] = "#";
460
572
461
573
custom_argc = 1;
462
574
custom_argv = malloc(sizeof(char*) * 2);
463
575
if(custom_argv == NULL){
468
580
custom_argv[0] = argv[0];
469
581
custom_argv[1] = NULL;
470
582
583
/* for each line in the config file, strip whitespace and ignore
584
commented text */
471
585
while(true){
472
586
sret = getline(&org_line, &size, conffp);
473
587
if(sret == -1){
474
588
break;
475
589
}
476
590
477
591
line = org_line;
478
592
arg = strsep(&line, comment_delim);
479
593
while((p = strsep(&arg, whitespace_delims)) != NULL){
481
595
continue;
482
596
}
483
597
new_arg = strdup(p);
484
598
if(new_arg == NULL){
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
601
free(org_line);
602
goto fallback;
603
}
604
485
605
custom_argc += 1;
486
606
custom_argv = realloc(custom_argv, sizeof(char *)
487
607
* ((unsigned int) custom_argc + 1));
496
616
}
497
617
}
498
618
free(org_line);
499
} else{
619
} else {
500
620
/* Check for harmful errors and go to fallback. Other errors might
501
621
not affect opening plugins */
502
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
503
623
perror("fopen");
504
624
exitstatus = EXIT_FAILURE;
505
625
goto fallback;
506
626
}
507
627
}
508
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
509
630
if(custom_argv != NULL){
510
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
511
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){
512
634
fprintf(stderr, "Unknown error while parsing arguments\n");
513
635
exitstatus = EXIT_FAILURE;
514
636
goto fallback;
515
637
}
516
638
}
517
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
518
649
if(debug){
519
650
for(plugin *p = plugin_list; p != NULL; p=p->next){
520
651
fprintf(stderr, "Plugin: %s has %d arguments\n",
522
653
for(char **a = p->argv; *a != NULL; a++){
523
654
fprintf(stderr, "\tArg: %s\n", *a);
524
655
}
525
fprintf(stderr, "...and %u environment variables\n", p->envc);
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
526
657
for(char **a = p->environ; *a != NULL; a++){
527
658
fprintf(stderr, "\t%s\n", *a);
528
659
}
529
660
}
530
661
}
531
662
663
/* Strip permissions down to nobody */
664
setgid(gid);
665
if(ret == -1){
666
perror("setgid");
667
}
532
668
ret = setuid(uid);
533
if (ret == -1){
669
if(ret == -1){
534
670
perror("setuid");
535
671
}
536
672
537
setgid(gid);
538
if (ret == -1){
539
perror("setgid");
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
540
677
}
541
678
542
dir = opendir(plugindir);
543
679
if(dir == NULL){
544
680
perror("Could not open plugin dir");
545
681
exitstatus = EXIT_FAILURE;
561
697
562
698
FD_ZERO(&rfds_all);
563
699
700
/* Read and execute any executable in the plugin directory*/
564
701
while(true){
565
702
dirst = readdir(dir);
566
703
567
// All directory entries have been processed
704
/* All directory entries have been processed */
568
705
if(dirst == NULL){
569
if (errno == EBADF){
706
if(errno == EBADF){
570
707
perror("readdir");
571
708
exitstatus = EXIT_FAILURE;
572
709
goto fallback;
576
713
577
714
d_name_len = strlen(dirst->d_name);
578
715
579
// Ignore dotfiles, backup files and other junk
716
/* Ignore dotfiles, backup files and other junk */
580
717
{
581
718
bool bad_name = false;
582
719
584
721
585
722
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
586
723
".dpkg-old",
724
".dpkg-bak",
587
725
".dpkg-divert", NULL };
588
726
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
589
727
size_t pre_len = strlen(*pre);
597
735
break;
598
736
}
599
737
}
600
601
738
if(bad_name){
602
739
continue;
603
740
}
604
605
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
606
742
size_t suf_len = strlen(*suf);
607
743
if((d_name_len >= suf_len)
620
756
continue;
621
757
}
622
758
}
623
759
624
760
char *filename;
625
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
}
626
766
if(ret < 0){
627
767
perror("asprintf");
628
768
continue;
629
769
}
630
770
631
771
ret = stat(filename, &st);
632
if (ret == -1){
772
if(ret == -1){
633
773
perror("stat");
634
774
free(filename);
635
775
continue;
636
776
}
637
777
638
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)){
639
780
if(debug){
640
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
641
782
" with bad type or mode\n", filename);
643
784
free(filename);
644
785
continue;
645
786
}
646
plugin *p = getplugin(dirst->d_name, &plugin_list);
787
788
plugin *p = getplugin(dirst->d_name);
647
789
if(p == NULL){
648
790
perror("getplugin");
649
791
free(filename);
659
801
}
660
802
{
661
803
/* Add global arguments to argument list for this plugin */
662
plugin *g = getplugin(NULL, &plugin_list);
804
plugin *g = getplugin(NULL);
663
805
if(g != NULL){
664
806
for(char **a = g->argv + 1; *a != NULL; a++){
665
807
if(not add_argument(p, *a)){
668
810
}
669
811
/* Add global environment variables */
670
812
for(char **e = g->environ; *e != NULL; e++){
671
if(not add_environment(p, *e)){
813
if(not add_environment(p, *e, false)){
672
814
perror("add_environment");
673
815
}
674
816
}
679
821
process, too. */
680
822
if(p->environ[0] != NULL){
681
823
for(char **e = environ; *e != NULL; e++){
682
char *copy = strdup(*e);
683
if(copy == NULL){
684
perror("strdup");
685
continue;
686
}
687
if(not add_environment(p, copy)){
824
if(not add_environment(p, *e, false)){
688
825
perror("add_environment");
689
826
}
690
827
}
692
829
693
830
int pipefd[2];
694
831
ret = pipe(pipefd);
695
if (ret == -1){
832
if(ret == -1){
696
833
perror("pipe");
697
834
exitstatus = EXIT_FAILURE;
698
835
goto fallback;
699
836
}
837
/* Ask OS to automatic close the pipe on exec */
700
838
ret = set_cloexec_flag(pipefd[0]);
701
839
if(ret < 0){
702
840
perror("set_cloexec_flag");
710
848
goto fallback;
711
849
}
712
850
/* Block SIGCHLD until process is safely in process list */
713
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
714
852
if(ret < 0){
715
853
perror("sigprocmask");
716
854
exitstatus = EXIT_FAILURE;
717
855
goto fallback;
718
856
}
719
// Starting a new process to be watched
857
/* Starting a new process to be watched */
720
858
pid_t pid = fork();
721
859
if(pid == -1){
722
860
perror("fork");
730
868
perror("sigaction");
731
869
_exit(EXIT_FAILURE);
732
870
}
733
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
734
872
if(ret < 0){
735
873
perror("sigprocmask");
736
874
_exit(EXIT_FAILURE);
737
875
}
738
876
739
877
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
740
878
if(ret == -1){
741
879
perror("dup2");
760
898
}
761
899
/* no return */
762
900
}
763
/* parent process */
901
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
764
903
free(filename);
765
close(pipefd[1]); /* close unused write end of pipe */
766
process *new_process = malloc(sizeof(process));
767
if (new_process == NULL){
768
perror("malloc");
769
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);
770
908
if(ret < 0){
771
perror("sigprocmask");
909
perror("sigprocmask");
772
910
}
773
911
exitstatus = EXIT_FAILURE;
774
912
goto fallback;
775
913
}
776
914
777
*new_process = (struct process){ .pid = pid,
778
.fd = pipefd[0],
779
.next = process_list };
780
// List handling
781
process_list = new_process;
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
917
782
918
/* Unblock SIGCHLD so signal handler can be run if this process
783
919
has already completed */
784
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
785
921
if(ret < 0){
786
922
perror("sigprocmask");
787
923
exitstatus = EXIT_FAILURE;
788
924
goto fallback;
789
925
}
790
926
791
FD_SET(new_process->fd, &rfds_all);
927
FD_SET(new_plugin->fd, &rfds_all);
792
928
793
if (maxfd < new_process->fd){
794
maxfd = new_process->fd;
929
if(maxfd < new_plugin->fd){
930
maxfd = new_plugin->fd;
795
931
}
796
797
932
}
798
933
799
free_plugin_list(plugin_list);
800
plugin_list = NULL;
801
802
934
closedir(dir);
803
935
dir = NULL;
804
805
if (process_list == NULL){
806
fprintf(stderr, "No plugin processes started. Incorrect plugin"
807
" directory?\n");
808
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
}
809
947
}
810
while(process_list){
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
811
951
fd_set rfds = rfds_all;
812
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
813
if (select_ret == -1){
953
if(select_ret == -1){
814
954
perror("select");
815
955
exitstatus = EXIT_FAILURE;
816
956
goto fallback;
817
957
}
818
958
/* OK, now either a process completed, or something can be read
819
959
from one of them */
820
for(process *proc = process_list; proc ; proc = proc->next){
960
for(plugin *proc = plugin_list; proc != NULL;){
821
961
/* Is this process completely done? */
822
if(proc->eof and proc->completed){
962
if(proc->completed and proc->eof){
823
963
/* Only accept the plugin output if it exited cleanly */
824
964
if(not WIFEXITED(proc->status)
825
965
or WEXITSTATUS(proc->status) != 0){
826
966
/* Bad exit by plugin */
967
827
968
if(debug){
828
969
if(WIFEXITED(proc->status)){
829
fprintf(stderr, "Plugin %u exited with status %d\n",
830
(unsigned int) (proc->pid),
970
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
971
" status %d\n", proc->name,
972
(intmax_t) (proc->pid),
831
973
WEXITSTATUS(proc->status));
832
} else if(WIFSIGNALED(proc->status)) {
833
fprintf(stderr, "Plugin %u killed by signal %d\n",
834
(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),
835
978
WTERMSIG(proc->status));
836
979
} else if(WCOREDUMP(proc->status)){
837
fprintf(stderr, "Plugin %d dumped core\n",
838
(unsigned int) (proc->pid));
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
981
" core\n", proc->name, (intmax_t) (proc->pid));
839
982
}
840
983
}
984
841
985
/* Remove the plugin */
842
986
FD_CLR(proc->fd, &rfds_all);
987
843
988
/* Block signal while modifying process_list */
844
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
845
990
if(ret < 0){
847
992
exitstatus = EXIT_FAILURE;
848
993
goto fallback;
849
994
}
850
/* Delete this process entry from the list */
851
if(process_list == proc){
852
/* First one - simple */
853
process_list = proc->next;
854
} else {
855
/* Second one or later */
856
for(process *p = process_list; p != NULL; p = p->next){
857
if(p->next == proc){
858
p->next = proc->next;
859
break;
860
}
861
}
862
}
995
996
plugin *next_plugin = proc->next;
997
free_plugin(proc);
998
proc = next_plugin;
999
863
1000
/* We are done modifying process list, so unblock signal */
864
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
865
NULL);
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
866
1003
if(ret < 0){
867
1004
perror("sigprocmask");
868
}
869
free(proc->buffer);
870
free(proc);
871
/* We deleted this process from the list, so we can't go
872
proc->next. Therefore, start over from the beginning of
873
the process list */
874
break;
1005
exitstatus = EXIT_FAILURE;
1006
goto fallback;
1007
}
1008
1009
if(plugin_list == NULL){
1010
break;
1011
}
1012
1013
continue;
875
1014
}
1015
876
1016
/* This process exited nicely, so print its buffer */
877
1017
878
1018
bool bret = print_out_password(proc->buffer,
879
1019
proc->buffer_length);
880
1020
if(not bret){
883
1023
}
884
1024
goto fallback;
885
1025
}
1026
886
1027
/* This process has not completed. Does it have any output? */
887
1028
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
888
1029
/* This process had nothing to say at this time */
1030
proc = proc->next;
889
1031
continue;
890
1032
}
891
1033
/* Before reading, make the process' data buffer large enough */
892
1034
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
893
1035
proc->buffer = realloc(proc->buffer, proc->buffer_size
894
1036
+ (size_t) BUFFER_SIZE);
895
if (proc->buffer == NULL){
1037
if(proc->buffer == NULL){
896
1038
perror("malloc");
897
1039
exitstatus = EXIT_FAILURE;
898
1040
goto fallback;
900
1042
proc->buffer_size += BUFFER_SIZE;
901
1043
}
902
1044
/* Read from the process */
903
ret = read(proc->fd, proc->buffer + proc->buffer_length,
904
BUFFER_SIZE);
905
if(ret < 0){
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1047
if(sret < 0){
906
1048
/* Read error from this process; ignore the error */
1049
proc = proc->next;
907
1050
continue;
908
1051
}
909
if(ret == 0){
1052
if(sret == 0){
910
1053
/* got EOF */
911
1054
proc->eof = true;
912
1055
} else {
913
proc->buffer_length += (size_t) ret;
1056
proc->buffer_length += (size_t) sret;
914
1057
}
915
1058
}
916
1059
}
917
918
1060
1061
919
1062
fallback:
920
1063
921
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
922
1065
/* Fallback if all plugins failed, none are found or an error
923
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
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