To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 24.1.68
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.68
- Committer: Björn Påhlsson
- Date: 2008-08-25 01:40:55 UTC
- mfrom: (103 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 107.
- Revision ID: belorn@braxen-20080825014055-pv5v6vqwb7wjmxqx
merge
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
28
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
33
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
47
46
fcntl(), setuid(), setgid(),
48
47
F_GETFD, F_SETFD, FD_CLOEXEC,
49
48
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
51
50
execv(), write(), read(),
52
51
close() */
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
64
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
64
SIG_UNBLOCK, kill() */
66
65
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
68
66
69
67
#define BUFFER_SIZE 256
70
71
#define PDIR "/lib/mandos/plugins.d"
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
74
const char *argp_program_version = "plugin-runner " VERSION;
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
75
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
76
72
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
77
87
typedef struct plugin{
78
88
char *name; /* can be NULL or any plugin name */
79
89
char **argv;
81
91
char **environ;
82
92
int envc;
83
93
bool disabled;
84
85
/* Variables used for running processes*/
86
pid_t pid;
87
int fd;
88
char *buffer;
89
size_t buffer_size;
90
size_t buffer_length;
91
bool eof;
92
volatile sig_atomic_t completed;
93
int status;
94
94
struct plugin *next;
95
95
} plugin;
96
96
97
static plugin *plugin_list = NULL;
98
99
/* Gets an existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
if((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
106
101
return p;
107
102
}
108
103
}
109
104
/* Create a new plugin */
110
105
plugin *new_plugin = malloc(sizeof(plugin));
111
if(new_plugin == NULL){
106
if (new_plugin == NULL){
112
107
return NULL;
113
108
}
114
109
char *copy_name = NULL;
115
110
if(name != NULL){
116
111
copy_name = strdup(name);
117
112
if(copy_name == NULL){
118
free(new_plugin);
119
113
return NULL;
120
114
}
121
115
}
122
116
123
*new_plugin = (plugin){ .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
127
122
128
123
new_plugin->argv = malloc(sizeof(char *) * 2);
129
if(new_plugin->argv == NULL){
124
if (new_plugin->argv == NULL){
130
125
free(copy_name);
131
126
free(new_plugin);
132
127
return NULL;
133
128
}
134
129
new_plugin->argv[0] = copy_name;
135
130
new_plugin->argv[1] = NULL;
136
131
137
132
new_plugin->environ = malloc(sizeof(char *));
138
133
if(new_plugin->environ == NULL){
139
134
free(copy_name);
142
137
return NULL;
143
138
}
144
139
new_plugin->environ[0] = NULL;
145
146
140
/* Append the new plugin to the list */
147
plugin_list = new_plugin;
141
*plugin_list = new_plugin;
148
142
return new_plugin;
149
143
}
150
144
180
174
}
181
175
182
176
/* Add to a plugin's environment */
183
static bool add_environment(plugin *p, const char *def, bool replace){
177
static bool add_environment(plugin *p, const char *def){
184
178
if(p == NULL){
185
179
return false;
186
180
}
187
/* namelen = length of name of environment variable */
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
192
/* It already exists */
193
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
196
return false;
197
}
198
*e = new;
199
strcpy(*e, def);
200
}
201
return true;
202
}
203
}
204
181
return add_to_char_array(def, &(p->environ), &(p->envc));
205
182
}
206
183
184
207
185
/*
208
186
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
187
* Descriptor Flags".
210
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
211
189
*/
212
static int set_cloexec_flag(int fd){
190
static int set_cloexec_flag(int fd)
191
{
213
192
int ret = fcntl(fd, F_GETFD, 0);
214
193
/* If reading the flags failed, return error indication now. */
215
194
if(ret < 0){
219
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
199
}
221
200
201
process *process_list = NULL;
222
202
223
203
/* Mark processes as completed when they exit, and save their exit
224
204
status. */
225
static void handle_sigchld(__attribute__((unused)) int sig){
226
int old_errno = errno;
205
void handle_sigchld(__attribute__((unused)) int sig){
227
206
while(true){
228
plugin *proc = plugin_list;
207
process *proc = process_list;
229
208
int status;
230
209
pid_t pid = waitpid(-1, &status, WNOHANG);
231
210
if(pid == 0){
233
212
break;
234
213
}
235
214
if(pid == -1){
236
if(errno == ECHILD){
237
/* No child processes */
238
break;
215
if (errno != ECHILD){
216
perror("waitpid");
239
217
}
240
perror("waitpid");
218
/* No child processes */
219
break;
241
220
}
242
221
243
222
/* A child exited, find it in process_list */
244
223
while(proc != NULL and proc->pid != pid){
245
224
proc = proc->next;
249
228
continue;
250
229
}
251
230
proc->status = status;
252
proc->completed = 1;
231
proc->completed = true;
253
232
}
254
errno = old_errno;
255
233
}
256
234
257
/* Prints out a password to stdout */
258
static bool print_out_password(const char *buffer, size_t length){
235
bool print_out_password(const char *buffer, size_t length){
259
236
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
260
240
for(size_t written = 0; written < length; written += (size_t)ret){
261
241
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
262
242
length - written));
267
247
return true;
268
248
}
269
249
270
/* Removes and free a plugin from the plugin list */
271
static void free_plugin(plugin *plugin_node){
272
273
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
274
free(*arg);
275
}
276
free(plugin_node->argv);
277
for(char **env = plugin_node->environ; *env != NULL; env++){
278
free(*env);
279
}
280
free(plugin_node->environ);
281
free(plugin_node->buffer);
282
283
/* Removes the plugin from the singly-linked list */
284
if(plugin_node == plugin_list){
285
/* First one - simple */
286
plugin_list = plugin_list->next;
287
} else {
288
/* Second one or later */
289
for(plugin *p = plugin_list; p != NULL; p = p->next){
290
if(p->next == plugin_node){
291
p->next = plugin_node->next;
292
break;
293
}
294
}
295
}
296
297
free(plugin_node);
298
}
299
300
static void free_plugin_list(void){
301
while(plugin_list != NULL){
302
free_plugin(plugin_list);
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);
303
262
}
304
263
}
305
264
306
265
int main(int argc, char *argv[]){
307
char *plugindir = NULL;
308
char *argfile = NULL;
266
const char *plugindir = "/lib/mandos/plugins.d";
267
const char *argfile = ARGFILE;
309
268
FILE *conffp;
310
269
size_t d_name_len;
311
270
DIR *dir = NULL;
312
271
struct dirent *dirst;
313
272
struct stat st;
314
273
fd_set rfds_all;
315
int ret, numchars, maxfd = 0;
316
ssize_t sret;
317
intmax_t tmpmax;
274
int ret, maxfd = 0;
318
275
uid_t uid = 65534;
319
276
gid_t gid = 65534;
320
277
bool debug = false;
345
302
{ .name = "global-options", .key = 'g',
346
303
.arg = "OPTION[,OPTION[,...]]",
347
304
.doc = "Options passed to all plugins" },
348
{ .name = "global-env", .key = 'G',
305
{ .name = "global-envs", .key = 'e',
349
306
.arg = "VAR=value",
350
307
.doc = "Environment variable passed to all plugins" },
351
308
{ .name = "options-for", .key = 'o',
352
309
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
353
310
.doc = "Options passed only to specified plugin" },
354
{ .name = "env-for", .key = 'E',
311
{ .name = "envs-for", .key = 'f',
355
312
.arg = "PLUGIN:ENV=value",
356
313
.doc = "Environment variable passed to specified plugin" },
357
314
{ .name = "disable", .key = 'd',
358
315
.arg = "PLUGIN",
359
316
.doc = "Disable a specific plugin", .group = 1 },
360
{ .name = "enable", .key = 'e',
361
.arg = "PLUGIN",
362
.doc = "Enable a specific plugin", .group = 1 },
363
317
{ .name = "plugin-dir", .key = 128,
364
318
.arg = "DIRECTORY",
365
319
.doc = "Specify a different plugin directory", .group = 2 },
366
{ .name = "config-file", .key = 129,
367
.arg = "FILE",
368
.doc = "Specify a different configuration file", .group = 2 },
369
{ .name = "userid", .key = 130,
370
.arg = "ID", .flags = 0,
371
.doc = "User ID the plugins will run as", .group = 3 },
372
{ .name = "groupid", .key = 131,
373
.arg = "ID", .flags = 0,
374
.doc = "Group ID the plugins will run as", .group = 3 },
375
{ .name = "debug", .key = 132,
376
.doc = "Debug mode", .group = 4 },
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 },
377
328
{ .name = NULL }
378
329
};
379
330
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
382
switch(key){
383
case 'g': /* --global-options */
384
if(arg != NULL){
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){
385
338
char *p;
386
339
while((p = strsep(&arg, ",")) != NULL){
387
340
if(p[0] == '\0'){
388
341
continue;
389
342
}
390
if(not add_argument(getplugin(NULL), p)){
343
if(not add_argument(getplugin(NULL, plugins), p)){
391
344
perror("add_argument");
392
345
return ARGP_ERR_UNKNOWN;
393
346
}
394
347
}
395
348
}
396
349
break;
397
case 'G': /* --global-env */
350
case 'e':
398
351
if(arg == NULL){
399
352
break;
400
353
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
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
362
}
404
363
break;
405
case 'o': /* --options-for */
406
if(arg != NULL){
364
case 'o':
365
if (arg != NULL){
407
366
char *p_name = strsep(&arg, ":");
408
if(p_name[0] == '\0' or arg == NULL){
367
if(p_name[0] == '\0'){
409
368
break;
410
369
}
411
370
char *opt = strsep(&arg, ":");
412
if(opt[0] == '\0' or opt == NULL){
371
if(opt[0] == '\0'){
413
372
break;
414
373
}
415
char *p;
416
while((p = strsep(&opt, ",")) != NULL){
417
if(p[0] == '\0'){
418
continue;
419
}
420
if(not add_argument(getplugin(p_name), p)){
421
perror("add_argument");
422
return ARGP_ERR_UNKNOWN;
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
}
423
384
}
424
385
}
425
386
}
426
387
break;
427
case 'E': /* --env-for */
388
case 'f':
428
389
if(arg == NULL){
429
390
break;
430
391
}
433
394
if(envdef == NULL){
434
395
break;
435
396
}
436
*envdef = '\0';
437
if(not add_environment(getplugin(arg), envdef+1, true)){
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)){
438
403
perror("add_environment");
439
404
}
440
405
}
441
406
break;
442
case 'd': /* --disable */
443
if(arg != NULL){
444
plugin *p = getplugin(arg);
407
case 'd':
408
if (arg != NULL){
409
plugin *p = getplugin(arg, plugins);
445
410
if(p == NULL){
446
411
return ARGP_ERR_UNKNOWN;
447
412
}
448
413
p->disabled = true;
449
414
}
450
415
break;
451
case 'e': /* --enable */
452
if(arg != NULL){
453
plugin *p = getplugin(arg);
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
456
}
457
p->disabled = false;
458
}
459
break;
460
case 128: /* --plugin-dir */
461
free(plugindir);
462
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
466
break;
467
case 129: /* --config-file */
468
/* This is already done by parse_opt_config_file() */
469
break;
470
case 130: /* --userid */
471
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
472
if(ret < 1 or tmpmax != (uid_t)tmpmax
473
or arg[numchars] != '\0'){
474
fprintf(stderr, "Bad user ID number: \"%s\", using %"
475
PRIdMAX "\n", arg, (intmax_t)uid);
476
} else {
477
uid = (uid_t)tmpmax;
478
}
479
break;
480
case 131: /* --groupid */
481
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
482
if(ret < 1 or tmpmax != (gid_t)tmpmax
483
or arg[numchars] != '\0'){
484
fprintf(stderr, "Bad group ID number: \"%s\", using %"
485
PRIdMAX "\n", arg, (intmax_t)gid);
486
} else {
487
gid = (gid_t)tmpmax;
488
}
489
break;
490
case 132: /* --debug */
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:
491
426
debug = true;
492
427
break;
493
/*
494
* When adding more options before this line, remember to also add a
495
* "case" to the "parse_opt_config_file" function below.
496
*/
497
case ARGP_KEY_ARG:
498
/* Cryptsetup always passes an argument, which is an empty
499
string if "none" was specified in /etc/crypttab. So if
500
argument was empty, we ignore it silently. */
501
if(arg[0] != '\0'){
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
503
}
504
break;
505
case ARGP_KEY_END:
506
break;
507
default:
508
return ARGP_ERR_UNKNOWN;
509
}
510
return 0;
511
}
512
513
/* This option parser is the same as parse_opt() above, except it
514
ignores everything but the --config-file option. */
515
error_t parse_opt_config_file(int key, char *arg,
516
__attribute__((unused))
517
struct argp_state *state){
518
switch(key){
519
case 'g': /* --global-options */
520
case 'G': /* --global-env */
521
case 'o': /* --options-for */
522
case 'E': /* --env-for */
523
case 'd': /* --disable */
524
case 'e': /* --enable */
525
case 128: /* --plugin-dir */
526
break;
527
case 129: /* --config-file */
528
free(argfile);
529
argfile = strdup(arg);
530
if(argfile == NULL){
531
perror("strdup");
532
}
533
break;
534
case 130: /* --userid */
535
case 131: /* --groupid */
536
case 132: /* --debug */
537
case ARGP_KEY_ARG:
538
case ARGP_KEY_END:
539
break;
540
default:
541
return ARGP_ERR_UNKNOWN;
542
}
543
return 0;
544
}
545
546
struct argp argp = { .options = options,
547
.parser = parse_opt_config_file,
548
.args_doc = "",
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]",
549
443
.doc = "Mandos plugin runner -- Run plugins" };
550
444
551
/* Parse using parse_opt_config_file() in order to get the custom
552
config file location, if any. */
553
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
554
if(ret == ARGP_ERR_UNKNOWN){
445
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
446
if (ret == ARGP_ERR_UNKNOWN){
555
447
fprintf(stderr, "Unknown error while parsing arguments\n");
556
448
exitstatus = EXIT_FAILURE;
557
449
goto fallback;
558
450
}
559
560
/* Reset to the normal argument parser */
561
argp.parser = parse_opt;
562
563
/* Open the configfile if available */
564
if(argfile == NULL){
565
conffp = fopen(AFILE, "r");
566
} else {
567
conffp = fopen(argfile, "r");
568
}
451
452
conffp = fopen(argfile, "r");
569
453
if(conffp != NULL){
570
454
char *org_line = NULL;
571
455
char *p, *arg, *new_arg, *line;
572
456
size_t size = 0;
457
ssize_t sret;
573
458
const char whitespace_delims[] = " \r\t\f\v\n";
574
459
const char comment_delim[] = "#";
575
460
582
467
}
583
468
custom_argv[0] = argv[0];
584
469
custom_argv[1] = NULL;
585
586
/* for each line in the config file, strip whitespace and ignore
587
commented text */
470
588
471
while(true){
589
472
sret = getline(&org_line, &size, conffp);
590
473
if(sret == -1){
598
481
continue;
599
482
}
600
483
new_arg = strdup(p);
601
if(new_arg == NULL){
602
perror("strdup");
603
exitstatus = EXIT_FAILURE;
604
free(org_line);
605
goto fallback;
606
}
607
484
608
485
custom_argc += 1;
609
486
custom_argv = realloc(custom_argv, sizeof(char *)
610
487
* ((unsigned int) custom_argc + 1));
619
496
}
620
497
}
621
498
free(org_line);
622
} else {
499
} else{
623
500
/* Check for harmful errors and go to fallback. Other errors might
624
501
not affect opening plugins */
625
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
502
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
626
503
perror("fopen");
627
504
exitstatus = EXIT_FAILURE;
628
505
goto fallback;
629
506
}
630
507
}
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
508
633
509
if(custom_argv != NULL){
634
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
635
0, NULL);
636
if(ret == ARGP_ERR_UNKNOWN){
510
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
511
if (ret == ARGP_ERR_UNKNOWN){
637
512
fprintf(stderr, "Unknown error while parsing arguments\n");
638
513
exitstatus = EXIT_FAILURE;
639
514
goto fallback;
640
515
}
641
516
}
642
517
643
/* Parse actual command line arguments, to let them override the
644
config file */
645
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
646
if(ret == ARGP_ERR_UNKNOWN){
647
fprintf(stderr, "Unknown error while parsing arguments\n");
648
exitstatus = EXIT_FAILURE;
649
goto fallback;
650
}
651
652
518
if(debug){
653
519
for(plugin *p = plugin_list; p != NULL; p=p->next){
654
520
fprintf(stderr, "Plugin: %s has %d arguments\n",
656
522
for(char **a = p->argv; *a != NULL; a++){
657
523
fprintf(stderr, "\tArg: %s\n", *a);
658
524
}
659
fprintf(stderr, "...and %d environment variables\n", p->envc);
525
fprintf(stderr, "...and %u environment variables\n", p->envc);
660
526
for(char **a = p->environ; *a != NULL; a++){
661
527
fprintf(stderr, "\t%s\n", *a);
662
528
}
663
529
}
664
530
}
665
531
666
/* Strip permissions down to nobody */
532
ret = setuid(uid);
533
if (ret == -1){
534
perror("setuid");
535
}
536
667
537
setgid(gid);
668
if(ret == -1){
538
if (ret == -1){
669
539
perror("setgid");
670
540
}
671
ret = setuid(uid);
672
if(ret == -1){
673
perror("setuid");
674
}
675
676
if(plugindir == NULL){
677
dir = opendir(PDIR);
678
} else {
679
dir = opendir(plugindir);
680
}
681
541
542
dir = opendir(plugindir);
682
543
if(dir == NULL){
683
544
perror("Could not open plugin dir");
684
545
exitstatus = EXIT_FAILURE;
700
561
701
562
FD_ZERO(&rfds_all);
702
563
703
/* Read and execute any executable in the plugin directory*/
704
564
while(true){
705
565
dirst = readdir(dir);
706
566
707
/* All directory entries have been processed */
567
// All directory entries have been processed
708
568
if(dirst == NULL){
709
if(errno == EBADF){
569
if (errno == EBADF){
710
570
perror("readdir");
711
571
exitstatus = EXIT_FAILURE;
712
572
goto fallback;
716
576
717
577
d_name_len = strlen(dirst->d_name);
718
578
719
/* Ignore dotfiles, backup files and other junk */
579
// Ignore dotfiles, backup files and other junk
720
580
{
721
581
bool bad_name = false;
722
582
724
584
725
585
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
726
586
".dpkg-old",
727
".dpkg-bak",
728
587
".dpkg-divert", NULL };
729
588
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
730
589
size_t pre_len = strlen(*pre);
738
597
break;
739
598
}
740
599
}
600
741
601
if(bad_name){
742
602
continue;
743
603
}
604
744
605
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
745
606
size_t suf_len = strlen(*suf);
746
607
if((d_name_len >= suf_len)
761
622
}
762
623
763
624
char *filename;
764
if(plugindir == NULL){
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
766
} else {
767
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
768
}
625
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
769
626
if(ret < 0){
770
627
perror("asprintf");
771
628
continue;
772
629
}
773
630
774
631
ret = stat(filename, &st);
775
if(ret == -1){
632
if (ret == -1){
776
633
perror("stat");
777
634
free(filename);
778
635
continue;
779
636
}
780
781
/* Ignore non-executable files */
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
637
638
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
783
639
if(debug){
784
640
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
785
641
" with bad type or mode\n", filename);
787
643
free(filename);
788
644
continue;
789
645
}
790
791
plugin *p = getplugin(dirst->d_name);
646
plugin *p = getplugin(dirst->d_name, &plugin_list);
792
647
if(p == NULL){
793
648
perror("getplugin");
794
649
free(filename);
804
659
}
805
660
{
806
661
/* Add global arguments to argument list for this plugin */
807
plugin *g = getplugin(NULL);
662
plugin *g = getplugin(NULL, &plugin_list);
808
663
if(g != NULL){
809
664
for(char **a = g->argv + 1; *a != NULL; a++){
810
665
if(not add_argument(p, *a)){
813
668
}
814
669
/* Add global environment variables */
815
670
for(char **e = g->environ; *e != NULL; e++){
816
if(not add_environment(p, *e, false)){
671
if(not add_environment(p, *e)){
817
672
perror("add_environment");
818
673
}
819
674
}
824
679
process, too. */
825
680
if(p->environ[0] != NULL){
826
681
for(char **e = environ; *e != NULL; e++){
827
if(not add_environment(p, *e, false)){
682
char *copy = strdup(*e);
683
if(copy == NULL){
684
perror("strdup");
685
continue;
686
}
687
if(not add_environment(p, copy)){
828
688
perror("add_environment");
829
689
}
830
690
}
832
692
833
693
int pipefd[2];
834
694
ret = pipe(pipefd);
835
if(ret == -1){
695
if (ret == -1){
836
696
perror("pipe");
837
697
exitstatus = EXIT_FAILURE;
838
698
goto fallback;
839
699
}
840
/* Ask OS to automatic close the pipe on exec */
841
700
ret = set_cloexec_flag(pipefd[0]);
842
701
if(ret < 0){
843
702
perror("set_cloexec_flag");
851
710
goto fallback;
852
711
}
853
712
/* Block SIGCHLD until process is safely in process list */
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
713
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
855
714
if(ret < 0){
856
715
perror("sigprocmask");
857
716
exitstatus = EXIT_FAILURE;
858
717
goto fallback;
859
718
}
860
/* Starting a new process to be watched */
719
// Starting a new process to be watched
861
720
pid_t pid = fork();
862
721
if(pid == -1){
863
722
perror("fork");
871
730
perror("sigaction");
872
731
_exit(EXIT_FAILURE);
873
732
}
874
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
733
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
875
734
if(ret < 0){
876
735
perror("sigprocmask");
877
736
_exit(EXIT_FAILURE);
878
737
}
879
738
880
739
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
881
740
if(ret == -1){
882
741
perror("dup2");
901
760
}
902
761
/* no return */
903
762
}
904
/* Parent process */
905
close(pipefd[1]); /* Close unused write end of pipe */
763
/* parent process */
906
764
free(filename);
907
plugin *new_plugin = getplugin(dirst->d_name);
908
if(new_plugin == NULL){
909
perror("getplugin");
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
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);
911
770
if(ret < 0){
912
perror("sigprocmask");
771
perror("sigprocmask");
913
772
}
914
773
exitstatus = EXIT_FAILURE;
915
774
goto fallback;
916
775
}
917
776
918
new_plugin->pid = pid;
919
new_plugin->fd = pipefd[0];
920
777
*new_process = (struct process){ .pid = pid,
778
.fd = pipefd[0],
779
.next = process_list };
780
// List handling
781
process_list = new_process;
921
782
/* Unblock SIGCHLD so signal handler can be run if this process
922
783
has already completed */
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
784
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
924
785
if(ret < 0){
925
786
perror("sigprocmask");
926
787
exitstatus = EXIT_FAILURE;
927
788
goto fallback;
928
789
}
929
790
930
FD_SET(new_plugin->fd, &rfds_all);
791
FD_SET(new_process->fd, &rfds_all);
931
792
932
if(maxfd < new_plugin->fd){
933
maxfd = new_plugin->fd;
793
if (maxfd < new_process->fd){
794
maxfd = new_process->fd;
934
795
}
796
935
797
}
936
798
799
free_plugin_list(plugin_list);
800
plugin_list = NULL;
801
937
802
closedir(dir);
938
803
dir = NULL;
939
940
for(plugin *p = plugin_list; p != NULL; p = p->next){
941
if(p->pid != 0){
942
break;
943
}
944
if(p->next == NULL){
945
fprintf(stderr, "No plugin processes started. Incorrect plugin"
946
" directory?\n");
947
free_plugin_list();
948
}
804
805
if (process_list == NULL){
806
fprintf(stderr, "No plugin processes started. Incorrect plugin"
807
" directory?\n");
808
process_list = NULL;
949
809
}
950
951
/* Main loop while running plugins exist */
952
while(plugin_list){
810
while(process_list){
953
811
fd_set rfds = rfds_all;
954
812
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
955
if(select_ret == -1){
813
if (select_ret == -1){
956
814
perror("select");
957
815
exitstatus = EXIT_FAILURE;
958
816
goto fallback;
959
817
}
960
818
/* OK, now either a process completed, or something can be read
961
819
from one of them */
962
for(plugin *proc = plugin_list; proc != NULL;){
820
for(process *proc = process_list; proc ; proc = proc->next){
963
821
/* Is this process completely done? */
964
if(proc->completed and proc->eof){
822
if(proc->eof and proc->completed){
965
823
/* Only accept the plugin output if it exited cleanly */
966
824
if(not WIFEXITED(proc->status)
967
825
or WEXITSTATUS(proc->status) != 0){
968
826
/* Bad exit by plugin */
969
970
827
if(debug){
971
828
if(WIFEXITED(proc->status)){
972
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
973
" status %d\n", proc->name,
974
(intmax_t) (proc->pid),
829
fprintf(stderr, "Plugin %u exited with status %d\n",
830
(unsigned int) (proc->pid),
975
831
WEXITSTATUS(proc->status));
976
} else if(WIFSIGNALED(proc->status)){
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
978
" signal %d\n", proc->name,
979
(intmax_t) (proc->pid),
832
} else if(WIFSIGNALED(proc->status)) {
833
fprintf(stderr, "Plugin %u killed by signal %d\n",
834
(unsigned int) (proc->pid),
980
835
WTERMSIG(proc->status));
981
836
} else if(WCOREDUMP(proc->status)){
982
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
983
" core\n", proc->name, (intmax_t) (proc->pid));
837
fprintf(stderr, "Plugin %d dumped core\n",
838
(unsigned int) (proc->pid));
984
839
}
985
840
}
986
987
841
/* Remove the plugin */
988
842
FD_CLR(proc->fd, &rfds_all);
989
990
843
/* Block signal while modifying process_list */
991
844
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
992
845
if(ret < 0){
994
847
exitstatus = EXIT_FAILURE;
995
848
goto fallback;
996
849
}
997
998
plugin *next_plugin = proc->next;
999
free_plugin(proc);
1000
proc = next_plugin;
1001
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
}
1002
863
/* We are done modifying process list, so unblock signal */
1003
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1004
NULL);
864
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
865
NULL);
1005
866
if(ret < 0){
1006
867
perror("sigprocmask");
1007
exitstatus = EXIT_FAILURE;
1008
goto fallback;
1009
}
1010
1011
if(plugin_list == NULL){
1012
break;
1013
}
1014
1015
continue;
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;
1016
875
}
1017
1018
876
/* This process exited nicely, so print its buffer */
1019
877
1020
878
bool bret = print_out_password(proc->buffer,
1021
879
proc->buffer_length);
1022
880
if(not bret){
1025
883
}
1026
884
goto fallback;
1027
885
}
1028
1029
886
/* This process has not completed. Does it have any output? */
1030
887
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1031
888
/* This process had nothing to say at this time */
1032
proc = proc->next;
1033
889
continue;
1034
890
}
1035
891
/* Before reading, make the process' data buffer large enough */
1036
892
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1037
893
proc->buffer = realloc(proc->buffer, proc->buffer_size
1038
894
+ (size_t) BUFFER_SIZE);
1039
if(proc->buffer == NULL){
895
if (proc->buffer == NULL){
1040
896
perror("malloc");
1041
897
exitstatus = EXIT_FAILURE;
1042
898
goto fallback;
1044
900
proc->buffer_size += BUFFER_SIZE;
1045
901
}
1046
902
/* Read from the process */
1047
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1048
BUFFER_SIZE);
1049
if(sret < 0){
903
ret = read(proc->fd, proc->buffer + proc->buffer_length,
904
BUFFER_SIZE);
905
if(ret < 0){
1050
906
/* Read error from this process; ignore the error */
1051
proc = proc->next;
1052
907
continue;
1053
908
}
1054
if(sret == 0){
909
if(ret == 0){
1055
910
/* got EOF */
1056
911
proc->eof = true;
1057
912
} else {
1058
proc->buffer_length += (size_t) sret;
913
proc->buffer_length += (size_t) ret;
1059
914
}
1060
915
}
1061
916
}
1063
918
1064
919
fallback:
1065
920
1066
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
921
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1067
922
/* Fallback if all plugins failed, none are found or an error
1068
923
occured */
1069
924
bool bret;
1070
925
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1071
926
char *passwordbuffer = getpass("Password: ");
1072
size_t len = strlen(passwordbuffer);
1073
/* Strip trailing newline */
1074
if(len > 0 and passwordbuffer[len-1] == '\n'){
1075
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1076
len--;
1077
}
1078
bret = print_out_password(passwordbuffer, len);
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1079
928
if(not bret){
1080
929
perror("print_out_password");
1081
930
exitstatus = EXIT_FAILURE;
1088
937
perror("sigaction");
1089
938
exitstatus = EXIT_FAILURE;
1090
939
}
1091
940
1092
941
if(custom_argv != NULL){
1093
942
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1094
943
free(*arg);
1095
944
}
1096
945
free(custom_argv);
1097
946
}
947
free_plugin_list(plugin_list);
1098
948
1099
949
if(dir != NULL){
1100
950
closedir(dir);
1101
951
}
1102
952
1103
/* Kill the processes */
1104
for(plugin *p = plugin_list; p != NULL; p = p->next){
1105
if(p->pid != 0){
1106
close(p->fd);
1107
ret = kill(p->pid, SIGTERM);
1108
if(ret == -1 and errno != ESRCH){
1109
/* Set-uid proccesses might not get closed */
1110
perror("kill");
1111
}
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");
1112
961
}
962
free(process_list->buffer);
963
free(process_list);
1113
964
}
1114
965
1115
966
/* Wait for any remaining child processes to terminate */
1120
971
perror("wait");
1121
972
}
1122
973
1123
free_plugin_list();
1124
1125
free(plugindir);
1126
free(argfile);
1127
1128
974
return exitstatus;
1129
975
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0