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- Committer: Teddy Hogeborn
- Date: 2008-08-16 16:58:31 UTC
- Revision ID: teddy@fukt.bsnet.se-20080816165831-cx018vo5i9oqmgo0
* plugins.d/password-request.c (main): Include environment variables
"cryptsource" and "crypttarget"
in password prompt.
"cryptsource" and "crypttarget"
in password prompt.
- files added:
- network-protocol.txt
- 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,
57
56
#include <argp.h> /* struct argp_option, struct
58
57
argp_state, struct argp,
59
58
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
60
#include <signal.h> /* struct sigaction, sigemptyset(),
63
61
sigaddset(), sigaction(),
64
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
64
#include <errno.h> /* errno, EBADF */
67
65
68
66
#define BUFFER_SIZE 256
69
70
#define PDIR "/lib/mandos/plugins.d"
71
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
73
const char *argp_program_version = "plugin-runner " VERSION;
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
74
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
75
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
76
86
typedef struct plugin{
77
87
char *name; /* can be NULL or any plugin name */
78
88
char **argv;
80
90
char **environ;
81
91
int envc;
82
92
bool disabled;
83
84
/* Variables used for running processes*/
85
pid_t pid;
86
int fd;
87
char *buffer;
88
size_t buffer_size;
89
size_t buffer_length;
90
bool eof;
91
volatile bool completed;
92
volatile int status;
93
93
struct plugin *next;
94
94
} plugin;
95
95
96
static plugin *plugin_list = NULL;
97
98
/* Gets an existing plugin based on name,
99
or if none is found, creates a new one */
100
static plugin *getplugin(char *name){
101
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
103
98
if ((p->name == name)
104
99
or (p->name and name and (strcmp(p->name, name) == 0))){
105
100
return p;
110
105
if (new_plugin == NULL){
111
106
return NULL;
112
107
}
113
char *copy_name = NULL;
114
if(name != NULL){
115
copy_name = strdup(name);
116
if(copy_name == NULL){
117
return NULL;
118
}
119
}
120
121
*new_plugin = (plugin) { .name = copy_name,
108
*new_plugin = (plugin) { .name = name,
122
109
.argc = 1,
110
.envc = 0,
123
111
.disabled = false,
124
.next = plugin_list };
112
.next = *plugin_list };
125
113
126
114
new_plugin->argv = malloc(sizeof(char *) * 2);
127
115
if (new_plugin->argv == NULL){
128
free(copy_name);
129
116
free(new_plugin);
130
117
return NULL;
131
118
}
132
new_plugin->argv[0] = copy_name;
119
new_plugin->argv[0] = name;
133
120
new_plugin->argv[1] = NULL;
134
121
135
122
new_plugin->environ = malloc(sizeof(char *));
136
123
if(new_plugin->environ == NULL){
137
free(copy_name);
138
124
free(new_plugin->argv);
139
125
free(new_plugin);
140
126
return NULL;
141
127
}
142
128
new_plugin->environ[0] = NULL;
143
144
129
/* Append the new plugin to the list */
145
plugin_list = new_plugin;
130
*plugin_list = new_plugin;
146
131
return new_plugin;
147
132
}
148
133
178
163
}
179
164
180
165
/* Add to a plugin's environment */
181
static bool add_environment(plugin *p, const char *def, bool replace){
166
static bool add_environment(plugin *p, const char *def){
182
167
if(p == NULL){
183
168
return false;
184
169
}
185
/* namelen = length of name of environment variable */
186
size_t namelen = (size_t)(strchrnul(def, '=') - def);
187
/* Search for this environment variable */
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
190
/* It already exists */
191
if(replace){
192
char *new = realloc(*e, strlen(def) + 1);
193
if(new == NULL){
194
return false;
195
}
196
*e = new;
197
strcpy(*e, def);
198
}
199
return true;
200
}
201
}
202
170
return add_to_char_array(def, &(p->environ), &(p->envc));
203
171
}
204
172
173
205
174
/*
206
175
* Based on the example in the GNU LibC manual chapter 13.13 "File
207
176
* Descriptor Flags".
208
177
* *Note File Descriptor Flags:(libc)Descriptor Flags.
209
178
*/
210
static int set_cloexec_flag(int fd){
179
static int set_cloexec_flag(int fd)
180
{
211
181
int ret = fcntl(fd, F_GETFD, 0);
212
182
/* If reading the flags failed, return error indication now. */
213
183
if(ret < 0){
217
187
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
218
188
}
219
189
190
process *process_list = NULL;
220
191
221
/* Mark processes as completed when they exit, and save their exit
192
/* Mark a process as completed when it exits, and save its exit
222
193
status. */
223
static void handle_sigchld(__attribute__((unused)) int sig){
224
while(true){
225
plugin *proc = plugin_list;
226
int status;
227
pid_t pid = waitpid(-1, &status, WNOHANG);
228
if(pid == 0){
229
/* Only still running child processes */
230
break;
231
}
232
if(pid == -1){
233
if (errno != ECHILD){
234
perror("waitpid");
235
}
236
/* No child processes */
237
break;
238
}
239
240
/* A child exited, find it in process_list */
241
while(proc != NULL and proc->pid != pid){
242
proc = proc->next;
243
}
244
if(proc == NULL){
245
/* Process not found in process list */
246
continue;
247
}
248
proc->status = status;
249
proc->completed = true;
250
}
194
void handle_sigchld(__attribute__((unused)) int sig){
195
process *proc = process_list;
196
int status;
197
pid_t pid = wait(&status);
198
if(pid == -1){
199
perror("wait");
200
return;
201
}
202
while(proc != NULL and proc->pid != pid){
203
proc = proc->next;
204
}
205
if(proc == NULL){
206
/* Process not found in process list */
207
return;
208
}
209
proc->status = status;
210
proc->completed = true;
251
211
}
252
212
253
/* Prints out a password to stdout */
254
static bool print_out_password(const char *buffer, size_t length){
213
bool print_out_password(const char *buffer, size_t length){
255
214
ssize_t ret;
215
if(length>0 and buffer[length-1] == '\n'){
216
length--;
217
}
256
218
for(size_t written = 0; written < length; written += (size_t)ret){
257
219
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
258
220
length - written));
263
225
return true;
264
226
}
265
227
266
/* Removes and free a plugin from the plugin list */
267
static void free_plugin(plugin *plugin_node){
268
269
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
270
free(*arg);
271
}
272
free(plugin_node->argv);
273
for(char **env = plugin_node->environ; *env != NULL; env++){
274
free(*env);
275
}
276
free(plugin_node->environ);
277
free(plugin_node->buffer);
278
279
/* Removes the plugin from the singly-linked list */
280
if(plugin_node == plugin_list){
281
/* First one - simple */
282
plugin_list = plugin_list->next;
283
} else {
284
/* Second one or later */
285
for(plugin *p = plugin_list; p != NULL; p = p->next){
286
if(p->next == plugin_node){
287
p->next = plugin_node->next;
288
break;
289
}
228
char **add_to_argv(char **argv, int *argc, char *arg){
229
if (argv == NULL){
230
*argc = 1;
231
argv = malloc(sizeof(char*) * 2);
232
if(argv == NULL){
233
return NULL;
290
234
}
291
}
292
293
free(plugin_node);
294
}
295
296
static void free_plugin_list(void){
297
while(plugin_list != NULL){
298
free_plugin(plugin_list);
299
}
235
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
236
argv[1] = NULL;
237
}
238
*argc += 1;
239
argv = realloc(argv, sizeof(char *)
240
* ((unsigned int) *argc + 1));
241
if(argv == NULL){
242
return NULL;
243
}
244
argv[*argc-1] = arg;
245
argv[*argc] = NULL;
246
return argv;
300
247
}
301
248
302
249
int main(int argc, char *argv[]){
303
char *plugindir = NULL;
304
char *argfile = NULL;
250
const char *plugindir = "/lib/mandos/plugins.d";
251
const char *argfile = ARGFILE;
305
252
FILE *conffp;
306
253
size_t d_name_len;
307
254
DIR *dir = NULL;
309
256
struct stat st;
310
257
fd_set rfds_all;
311
258
int ret, maxfd = 0;
312
ssize_t sret;
313
259
uid_t uid = 65534;
314
260
gid_t gid = 65534;
315
261
bool debug = false;
323
269
/* Establish a signal handler */
324
270
sigemptyset(&sigchld_action.sa_mask);
325
271
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
326
if(ret == -1){
272
if(ret < 0){
327
273
perror("sigaddset");
328
exitstatus = EXIT_FAILURE;
329
goto fallback;
274
exit(EXIT_FAILURE);
330
275
}
331
276
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
332
if(ret == -1){
277
if(ret < 0){
333
278
perror("sigaction");
334
exitstatus = EXIT_FAILURE;
335
goto fallback;
279
exit(EXIT_FAILURE);
336
280
}
337
281
338
282
/* The options we understand. */
340
284
{ .name = "global-options", .key = 'g',
341
285
.arg = "OPTION[,OPTION[,...]]",
342
286
.doc = "Options passed to all plugins" },
343
{ .name = "global-env", .key = 'G',
287
{ .name = "global-envs", .key = 'e',
344
288
.arg = "VAR=value",
345
289
.doc = "Environment variable passed to all plugins" },
346
290
{ .name = "options-for", .key = 'o',
347
291
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
348
292
.doc = "Options passed only to specified plugin" },
349
{ .name = "env-for", .key = 'E',
293
{ .name = "envs-for", .key = 'f',
350
294
.arg = "PLUGIN:ENV=value",
351
295
.doc = "Environment variable passed to specified plugin" },
352
296
{ .name = "disable", .key = 'd',
353
297
.arg = "PLUGIN",
354
298
.doc = "Disable a specific plugin", .group = 1 },
355
{ .name = "enable", .key = 'e',
356
.arg = "PLUGIN",
357
.doc = "Enable a specific plugin", .group = 1 },
358
299
{ .name = "plugin-dir", .key = 128,
359
300
.arg = "DIRECTORY",
360
301
.doc = "Specify a different plugin directory", .group = 2 },
361
{ .name = "config-file", .key = 129,
362
.arg = "FILE",
363
.doc = "Specify a different configuration file", .group = 2 },
364
{ .name = "userid", .key = 130,
365
.arg = "ID", .flags = 0,
366
.doc = "User ID the plugins will run as", .group = 3 },
367
{ .name = "groupid", .key = 131,
368
.arg = "ID", .flags = 0,
369
.doc = "Group ID the plugins will run as", .group = 3 },
370
{ .name = "debug", .key = 132,
371
.doc = "Debug mode", .group = 4 },
302
{ .name = "userid", .key = 129,
303
.arg = "ID", .flags = 0,
304
.doc = "User ID the plugins will run as", .group = 2 },
305
{ .name = "groupid", .key = 130,
306
.arg = "ID", .flags = 0,
307
.doc = "Group ID the plugins will run as", .group = 2 },
308
{ .name = "debug", .key = 131,
309
.doc = "Debug mode", .group = 3 },
372
310
{ .name = NULL }
373
311
};
374
312
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
313
error_t parse_opt (int key, char *arg, struct argp_state *state) {
314
/* Get the INPUT argument from `argp_parse', which we know is a
315
pointer to our plugin list pointer. */
316
plugin **plugins = state->input;
377
317
switch (key) {
378
case 'g': /* --global-options */
318
case 'g':
379
319
if (arg != NULL){
380
320
char *p;
381
321
while((p = strsep(&arg, ",")) != NULL){
382
322
if(p[0] == '\0'){
383
323
continue;
384
324
}
385
if(not add_argument(getplugin(NULL), p)){
325
if(not add_argument(getplugin(NULL, plugins), p)){
386
326
perror("add_argument");
387
327
return ARGP_ERR_UNKNOWN;
388
328
}
389
329
}
390
330
}
391
331
break;
392
case 'G': /* --global-env */
332
case 'e':
393
333
if(arg == NULL){
394
334
break;
395
335
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
336
{
337
char *envdef = strdup(arg);
338
if(envdef == NULL){
339
break;
340
}
341
if(not add_environment(getplugin(NULL, plugins), envdef)){
342
perror("add_environment");
343
}
398
344
}
399
345
break;
400
case 'o': /* --options-for */
346
case 'o':
401
347
if (arg != NULL){
402
348
char *p_name = strsep(&arg, ":");
403
if(p_name[0] == '\0' or arg == NULL){
349
if(p_name[0] == '\0'){
404
350
break;
405
351
}
406
352
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
353
if(opt[0] == '\0'){
408
354
break;
409
355
}
410
char *p;
411
while((p = strsep(&opt, ",")) != NULL){
412
if(p[0] == '\0'){
413
continue;
414
}
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
356
if(opt != NULL){
357
char *p;
358
while((p = strsep(&opt, ",")) != NULL){
359
if(p[0] == '\0'){
360
continue;
361
}
362
if(not add_argument(getplugin(p_name, plugins), p)){
363
perror("add_argument");
364
return ARGP_ERR_UNKNOWN;
365
}
418
366
}
419
367
}
420
368
}
421
369
break;
422
case 'E': /* --env-for */
370
case 'f':
423
371
if(arg == NULL){
424
372
break;
425
373
}
428
376
if(envdef == NULL){
429
377
break;
430
378
}
431
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
379
char *p_name = strndup(arg, (size_t) (envdef-arg));
380
if(p_name == NULL){
381
break;
382
}
383
envdef++;
384
if(not add_environment(getplugin(p_name, plugins), envdef)){
433
385
perror("add_environment");
434
386
}
435
387
}
436
388
break;
437
case 'd': /* --disable */
389
case 'd':
438
390
if (arg != NULL){
439
plugin *p = getplugin(arg);
391
plugin *p = getplugin(arg, plugins);
440
392
if(p == NULL){
441
393
return ARGP_ERR_UNKNOWN;
442
394
}
443
395
p->disabled = true;
444
396
}
445
397
break;
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 */
398
case 128:
399
plugindir = arg;
400
break;
401
case 129:
466
402
uid = (uid_t)strtol(arg, NULL, 10);
467
403
break;
468
case 131: /* --groupid */
404
case 130:
469
405
gid = (gid_t)strtol(arg, NULL, 10);
470
406
break;
471
case 132: /* --debug */
407
case 131:
472
408
debug = true;
473
409
break;
474
410
case ARGP_KEY_ARG:
475
/* Cryptsetup always passes an argument, which is an empty
476
string if "none" was specified in /etc/crypttab. So if
477
argument was empty, we ignore it silently. */
478
if(arg[0] != '\0'){
479
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
480
}
481
break;
482
case ARGP_KEY_END:
483
break;
484
default:
485
return ARGP_ERR_UNKNOWN;
486
}
487
return 0;
488
}
489
490
/* This option parser is the same as parse_opt() above, except it
491
ignores everything but the --config-file option. */
492
error_t parse_opt_config_file (int key, char *arg,
493
__attribute__((unused))
494
struct argp_state *state) {
495
switch (key) {
496
case 'g': /* --global-options */
497
case 'G': /* --global-env */
498
case 'o': /* --options-for */
499
case 'E': /* --env-for */
500
case 'd': /* --disable */
501
case 'e': /* --enable */
502
case 128: /* --plugin-dir */
503
break;
504
case 129: /* --config-file */
505
free(argfile);
506
argfile = strdup(arg);
507
if(argfile == NULL){
508
perror("strdup");
509
}
510
break;
511
case 130: /* --userid */
512
case 131: /* --groupid */
513
case 132: /* --debug */
514
case ARGP_KEY_ARG:
515
case ARGP_KEY_END:
516
break;
517
default:
518
return ARGP_ERR_UNKNOWN;
519
}
520
return 0;
521
}
522
523
struct argp argp = { .options = options,
524
.parser = parse_opt_config_file,
525
.args_doc = "",
411
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
412
break;
413
case ARGP_KEY_END:
414
break;
415
default:
416
return ARGP_ERR_UNKNOWN;
417
}
418
return 0;
419
}
420
421
plugin *plugin_list = NULL;
422
423
struct argp argp = { .options = options, .parser = parse_opt,
424
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
526
425
.doc = "Mandos plugin runner -- Run plugins" };
527
426
528
/* Parse using the parse_opt_config_file in order to get the custom
529
config file location, if any. */
530
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
427
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
531
428
if (ret == ARGP_ERR_UNKNOWN){
532
429
fprintf(stderr, "Unknown error while parsing arguments\n");
533
430
exitstatus = EXIT_FAILURE;
534
goto fallback;
431
goto end;
535
432
}
536
537
/* Reset to the normal argument parser */
538
argp.parser = parse_opt;
539
540
/* Open the configfile if available */
541
if (argfile == NULL){
542
conffp = fopen(AFILE, "r");
543
} else {
544
conffp = fopen(argfile, "r");
545
}
433
434
conffp = fopen(argfile, "r");
546
435
if(conffp != NULL){
547
436
char *org_line = NULL;
437
size_t size = 0;
438
ssize_t sret;
548
439
char *p, *arg, *new_arg, *line;
549
size_t size = 0;
550
440
const char whitespace_delims[] = " \r\t\f\v\n";
551
441
const char comment_delim[] = "#";
552
442
553
custom_argc = 1;
554
custom_argv = malloc(sizeof(char*) * 2);
555
if(custom_argv == NULL){
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
558
goto fallback;
559
}
560
custom_argv[0] = argv[0];
561
custom_argv[1] = NULL;
562
563
/* for each line in the config file, strip whitespace and ignore
564
commented text */
565
443
while(true){
566
444
sret = getline(&org_line, &size, conffp);
567
445
if(sret == -1){
575
453
continue;
576
454
}
577
455
new_arg = strdup(p);
578
if(new_arg == NULL){
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
581
free(org_line);
582
goto fallback;
583
}
584
585
custom_argc += 1;
586
custom_argv = realloc(custom_argv, sizeof(char *)
587
* ((unsigned int) custom_argc + 1));
588
if(custom_argv == NULL){
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
591
free(org_line);
592
goto fallback;
593
}
594
custom_argv[custom_argc-1] = new_arg;
595
custom_argv[custom_argc] = NULL;
456
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
457
if (custom_argv == NULL){
458
perror("add_to_argv");
459
exitstatus = EXIT_FAILURE;
460
goto end;
461
}
596
462
}
597
463
}
598
464
free(org_line);
599
} else {
465
} else{
600
466
/* Check for harmful errors and go to fallback. Other errors might
601
467
not affect opening plugins */
602
468
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
469
perror("fopen");
604
470
exitstatus = EXIT_FAILURE;
605
goto fallback;
471
goto end;
606
472
}
607
473
}
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
474
610
475
if(custom_argv != NULL){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
476
custom_argv[0] = argv[0];
477
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
613
478
if (ret == ARGP_ERR_UNKNOWN){
614
479
fprintf(stderr, "Unknown error while parsing arguments\n");
615
480
exitstatus = EXIT_FAILURE;
616
goto fallback;
481
goto end;
617
482
}
618
483
}
619
484
620
/* Parse actual command line arguments, to let them override the
621
config file */
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
627
}
628
629
485
if(debug){
630
486
for(plugin *p = plugin_list; p != NULL; p=p->next){
631
487
fprintf(stderr, "Plugin: %s has %d arguments\n",
640
496
}
641
497
}
642
498
643
/* Strip permissions down to nobody */
644
499
ret = setuid(uid);
645
500
if (ret == -1){
646
501
perror("setuid");
647
}
502
}
503
648
504
setgid(gid);
649
505
if (ret == -1){
650
506
perror("setgid");
651
507
}
652
508
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
509
dir = opendir(plugindir);
659
510
if(dir == NULL){
660
511
perror("Could not open plugin dir");
661
512
exitstatus = EXIT_FAILURE;
662
goto fallback;
513
goto end;
663
514
}
664
515
665
516
/* Set the FD_CLOEXEC flag on the directory, if possible */
670
521
if(ret < 0){
671
522
perror("set_cloexec_flag");
672
523
exitstatus = EXIT_FAILURE;
673
goto fallback;
524
goto end;
674
525
}
675
526
}
676
527
}
677
528
678
529
FD_ZERO(&rfds_all);
679
530
680
/* Read and execute any executable in the plugin directory*/
681
531
while(true){
682
532
dirst = readdir(dir);
683
533
684
/* All directory entries have been processed */
534
// All directory entries have been processed
685
535
if(dirst == NULL){
686
536
if (errno == EBADF){
687
537
perror("readdir");
688
538
exitstatus = EXIT_FAILURE;
689
goto fallback;
539
goto end;
690
540
}
691
541
break;
692
542
}
693
543
694
544
d_name_len = strlen(dirst->d_name);
695
545
696
/* Ignore dotfiles, backup files and other junk */
546
// Ignore dotfiles, backup files and other junk
697
547
{
698
548
bool bad_name = false;
699
549
701
551
702
552
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
703
553
".dpkg-old",
704
".dpkg-bak",
705
554
".dpkg-divert", NULL };
706
555
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
707
556
size_t pre_len = strlen(*pre);
715
564
break;
716
565
}
717
566
}
567
718
568
if(bad_name){
719
569
continue;
720
570
}
571
721
572
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
722
573
size_t suf_len = strlen(*suf);
723
574
if((d_name_len >= suf_len)
738
589
}
739
590
740
591
char *filename;
741
if(plugindir == NULL){
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
743
} else {
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
745
}
592
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
746
593
if(ret < 0){
747
594
perror("asprintf");
748
595
continue;
754
601
free(filename);
755
602
continue;
756
603
}
757
758
/* Ignore non-executable files */
604
759
605
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
760
606
if(debug){
761
607
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
764
610
free(filename);
765
611
continue;
766
612
}
767
768
plugin *p = getplugin(dirst->d_name);
613
plugin *p = getplugin(dirst->d_name, &plugin_list);
769
614
if(p == NULL){
770
615
perror("getplugin");
771
616
free(filename);
781
626
}
782
627
{
783
628
/* Add global arguments to argument list for this plugin */
784
plugin *g = getplugin(NULL);
629
plugin *g = getplugin(NULL, &plugin_list);
785
630
if(g != NULL){
786
631
for(char **a = g->argv + 1; *a != NULL; a++){
787
632
if(not add_argument(p, *a)){
790
635
}
791
636
/* Add global environment variables */
792
637
for(char **e = g->environ; *e != NULL; e++){
793
if(not add_environment(p, *e, false)){
638
if(not add_environment(p, *e)){
794
639
perror("add_environment");
795
640
}
796
641
}
801
646
process, too. */
802
647
if(p->environ[0] != NULL){
803
648
for(char **e = environ; *e != NULL; e++){
804
if(not add_environment(p, *e, false)){
649
char *copy = strdup(*e);
650
if(copy == NULL){
651
perror("strdup");
652
continue;
653
}
654
if(not add_environment(p, copy)){
805
655
perror("add_environment");
806
656
}
807
657
}
808
658
}
809
659
810
int pipefd[2];
660
int pipefd[2];
811
661
ret = pipe(pipefd);
812
662
if (ret == -1){
813
663
perror("pipe");
814
664
exitstatus = EXIT_FAILURE;
815
goto fallback;
665
goto end;
816
666
}
817
/* Ask OS to automatic close the pipe on exec */
818
667
ret = set_cloexec_flag(pipefd[0]);
819
668
if(ret < 0){
820
669
perror("set_cloexec_flag");
821
670
exitstatus = EXIT_FAILURE;
822
goto fallback;
671
goto end;
823
672
}
824
673
ret = set_cloexec_flag(pipefd[1]);
825
674
if(ret < 0){
826
675
perror("set_cloexec_flag");
827
676
exitstatus = EXIT_FAILURE;
828
goto fallback;
677
goto end;
829
678
}
830
679
/* Block SIGCHLD until process is safely in process list */
831
680
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
832
681
if(ret < 0){
833
682
perror("sigprocmask");
834
683
exitstatus = EXIT_FAILURE;
835
goto fallback;
684
goto end;
836
685
}
837
/* Starting a new process to be watched */
686
// Starting a new process to be watched
838
687
pid_t pid = fork();
839
688
if(pid == -1){
840
689
perror("fork");
841
690
exitstatus = EXIT_FAILURE;
842
goto fallback;
691
goto end;
843
692
}
844
693
if(pid == 0){
845
694
/* this is the child process */
848
697
perror("sigaction");
849
698
_exit(EXIT_FAILURE);
850
699
}
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
700
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
701
if(ret < 0){
853
702
perror("sigprocmask");
854
703
_exit(EXIT_FAILURE);
855
704
}
856
705
857
706
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
858
707
if(ret == -1){
859
708
perror("dup2");
878
727
}
879
728
/* no return */
880
729
}
881
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
730
/* parent process */
883
731
free(filename);
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
732
close(pipefd[1]); /* close unused write end of pipe */
733
process *new_process = malloc(sizeof(process));
734
if (new_process == NULL){
735
perror("malloc");
887
736
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
888
737
if(ret < 0){
889
perror("sigprocmask");
738
perror("sigprocmask");
890
739
}
891
740
exitstatus = EXIT_FAILURE;
892
goto fallback;
741
goto end;
893
742
}
894
743
895
new_plugin->pid = pid;
896
new_plugin->fd = pipefd[0];
897
744
*new_process = (struct process){ .pid = pid,
745
.fd = pipefd[0],
746
.next = process_list };
747
// List handling
748
process_list = new_process;
898
749
/* Unblock SIGCHLD so signal handler can be run if this process
899
750
has already completed */
900
751
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
901
752
if(ret < 0){
902
753
perror("sigprocmask");
903
754
exitstatus = EXIT_FAILURE;
904
goto fallback;
905
}
906
907
FD_SET(new_plugin->fd, &rfds_all);
908
909
if (maxfd < new_plugin->fd){
910
maxfd = new_plugin->fd;
911
}
755
goto end;
756
}
757
758
FD_SET(new_process->fd, &rfds_all);
759
760
if (maxfd < new_process->fd){
761
maxfd = new_process->fd;
762
}
763
764
}
765
766
/* Free the plugin list */
767
for(plugin *next; plugin_list != NULL; plugin_list = next){
768
next = plugin_list->next;
769
free(plugin_list->argv);
770
if(plugin_list->environ[0] != NULL){
771
for(char **e = plugin_list->environ; *e != NULL; e++){
772
free(*e);
773
}
774
}
775
free(plugin_list);
912
776
}
913
777
914
778
closedir(dir);
915
779
dir = NULL;
916
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
918
if(p->pid != 0){
919
break;
920
}
921
if(p->next == NULL){
922
fprintf(stderr, "No plugin processes started. Incorrect plugin"
923
" directory?\n");
924
free_plugin_list();
925
}
780
781
if (process_list == NULL){
782
fprintf(stderr, "No plugin processes started. Incorrect plugin"
783
" directory?\n");
784
process_list = NULL;
926
785
}
927
928
/* Main loop while running plugins exist */
929
while(plugin_list){
786
while(process_list){
930
787
fd_set rfds = rfds_all;
931
788
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
932
789
if (select_ret == -1){
933
790
perror("select");
934
791
exitstatus = EXIT_FAILURE;
935
goto fallback;
792
goto end;
936
793
}
937
794
/* OK, now either a process completed, or something can be read
938
795
from one of them */
939
for(plugin *proc = plugin_list; proc != NULL;){
796
for(process *proc = process_list; proc ; proc = proc->next){
940
797
/* Is this process completely done? */
941
798
if(proc->eof and proc->completed){
942
799
/* Only accept the plugin output if it exited cleanly */
943
800
if(not WIFEXITED(proc->status)
944
801
or WEXITSTATUS(proc->status) != 0){
945
802
/* Bad exit by plugin */
946
947
803
if(debug){
948
804
if(WIFEXITED(proc->status)){
949
805
fprintf(stderr, "Plugin %u exited with status %d\n",
958
814
(unsigned int) (proc->pid));
959
815
}
960
816
}
961
962
817
/* Remove the plugin */
963
818
FD_CLR(proc->fd, &rfds_all);
964
965
819
/* Block signal while modifying process_list */
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
820
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
967
821
if(ret < 0){
968
822
perror("sigprocmask");
969
823
exitstatus = EXIT_FAILURE;
970
goto fallback;
971
}
972
973
plugin *next_plugin = proc->next;
974
free_plugin(proc);
975
proc = next_plugin;
976
824
goto end;
825
}
826
/* Delete this process entry from the list */
827
if(process_list == proc){
828
/* First one - simple */
829
process_list = proc->next;
830
} else {
831
/* Second one or later */
832
for(process *p = process_list; p != NULL; p = p->next){
833
if(p->next == proc){
834
p->next = proc->next;
835
break;
836
}
837
}
838
}
977
839
/* We are done modifying process list, so unblock signal */
978
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
841
NULL);
980
842
if(ret < 0){
981
843
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
990
continue;
844
}
845
free(proc->buffer);
846
free(proc);
847
/* We deleted this process from the list, so we can't go
848
proc->next. Therefore, start over from the beginning of
849
the process list */
850
break;
991
851
}
992
993
852
/* This process exited nicely, so print its buffer */
994
995
bool bret = print_out_password(proc->buffer,
996
proc->buffer_length);
853
854
bool bret = print_out_password(proc->buffer, proc->buffer_length);
997
855
if(not bret){
998
856
perror("print_out_password");
999
857
exitstatus = EXIT_FAILURE;
1000
858
}
1001
goto fallback;
859
goto end;
1002
860
}
1003
1004
861
/* This process has not completed. Does it have any output? */
1005
862
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1006
863
/* This process had nothing to say at this time */
1007
proc = proc->next;
1008
864
continue;
1009
865
}
1010
866
/* Before reading, make the process' data buffer large enough */
1014
870
if (proc->buffer == NULL){
1015
871
perror("malloc");
1016
872
exitstatus = EXIT_FAILURE;
1017
goto fallback;
873
goto end;
1018
874
}
1019
875
proc->buffer_size += BUFFER_SIZE;
1020
876
}
1021
877
/* Read from the process */
1022
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(sret < 0){
878
ret = read(proc->fd, proc->buffer + proc->buffer_length,
879
BUFFER_SIZE);
880
if(ret < 0){
1025
881
/* Read error from this process; ignore the error */
1026
proc = proc->next;
1027
882
continue;
1028
883
}
1029
if(sret == 0){
884
if(ret == 0){
1030
885
/* got EOF */
1031
886
proc->eof = true;
1032
887
} else {
1033
proc->buffer_length += (size_t) sret;
888
proc->buffer_length += (size_t) ret;
1034
889
}
1035
890
}
1036
891
}
1037
892
1038
893
1039
fallback:
894
end:
1040
895
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1042
/* Fallback if all plugins failed, none are found or an error
1043
occured */
896
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
897
/* Fallback if all plugins failed, none are found or an error occured */
1044
898
bool bret;
1045
899
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1046
900
char *passwordbuffer = getpass("Password: ");
1047
size_t len = strlen(passwordbuffer);
1048
/* Strip trailing newline */
1049
if(len > 0 and passwordbuffer[len-1] == '\n'){
1050
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1051
len--;
1052
}
1053
bret = print_out_password(passwordbuffer, len);
901
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1054
902
if(not bret){
1055
903
perror("print_out_password");
1056
904
exitstatus = EXIT_FAILURE;
905
goto end;
1057
906
}
1058
907
}
1059
908
1060
909
/* Restore old signal handler */
1061
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1062
if(ret == -1){
1063
perror("sigaction");
1064
exitstatus = EXIT_FAILURE;
1065
}
1066
1067
if(custom_argv != NULL){
1068
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1069
free(*arg);
910
sigaction(SIGCHLD, &old_sigchld_action, NULL);
911
912
free(custom_argv);
913
914
/* Free the plugin list */
915
for(plugin *next; plugin_list != NULL; plugin_list = next){
916
next = plugin_list->next;
917
free(plugin_list->argv);
918
if(plugin_list->environ[0] != NULL){
919
for(char **e = plugin_list->environ; *e != NULL; e++){
920
free(*e);
921
}
1070
922
}
1071
free(custom_argv);
923
free(plugin_list->environ);
924
free(plugin_list);
1072
925
}
1073
926
1074
927
if(dir != NULL){
1075
928
closedir(dir);
1076
929
}
1077
930
1078
/* Kill the processes */
1079
for(plugin *p = plugin_list; p != NULL; p = p->next){
1080
if(p->pid != 0){
1081
close(p->fd);
1082
ret = kill(p->pid, SIGTERM);
1083
if(ret == -1 and errno != ESRCH){
1084
/* Set-uid proccesses might not get closed */
1085
perror("kill");
1086
}
931
/* Free the process list and kill the processes */
932
for(process *next; process_list != NULL; process_list = next){
933
next = process_list->next;
934
close(process_list->fd);
935
ret = kill(process_list->pid, SIGTERM);
936
if(ret == -1 and errno != ESRCH){
937
/* set-uid proccesses migth not get closed */
938
perror("kill");
1087
939
}
940
free(process_list->buffer);
941
free(process_list);
1088
942
}
1089
943
1090
944
/* Wait for any remaining child processes to terminate */
1095
949
perror("wait");
1096
950
}
1097
951
1098
free_plugin_list();
1099
1100
free(plugindir);
1101
free(argfile);
1102
1103
952
return exitstatus;
1104
953
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0