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- Committer: Teddy Hogeborn
- Date: 2009-01-13 04:35:19 UTC
- Revision ID: teddy@fukt.bsnet.se-20090113043519-0yr39snphoegq8l1
* plugin-runner.c: Only space changes.
* plugins.d/mandos-client.c: - '' -
* plugins.d/password-prompt.c: - '' -
* plugins.d/mandos-client.c: - '' -
* plugins.d/password-prompt.c: - '' -
- 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,
65
66
#include <errno.h> /* errno, EBADF */
66
67
67
68
#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";
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;
71
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
75
73
struct process;
76
typedef struct plugin{
77
char *name; /* can be NULL or any plugin name */
78
char **argv;
79
int argc;
80
char **environ;
81
int envc;
82
bool disabled;
74
83
75
typedef struct process{
84
/* Variables used for running processes*/
76
85
pid_t pid;
77
86
int fd;
78
87
char *buffer;
81
90
bool eof;
82
91
volatile bool completed;
83
92
volatile int status;
84
struct process *next;
85
} process;
86
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
89
char **argv;
90
int argc;
91
char **environ;
92
int envc;
93
bool disabled;
94
93
struct plugin *next;
95
94
} plugin;
96
95
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))){
96
static plugin *plugin_list = NULL;
97
98
/* Gets an existing plugin based on name,
99
or if none is found, creates a new one */
100
static plugin *getplugin(char *name){
101
/* Check for exiting plugin with that name */
102
for(plugin *p = plugin_list; p != NULL; p = p->next){
103
if((p->name == name)
104
or (p->name and name and (strcmp(p->name, name) == 0))){
101
105
return p;
102
106
}
103
107
}
104
108
/* Create a new plugin */
105
109
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
110
if(new_plugin == NULL){
107
111
return NULL;
108
112
}
109
113
char *copy_name = NULL;
116
120
117
121
*new_plugin = (plugin) { .name = copy_name,
118
122
.argc = 1,
119
.envc = 0,
120
123
.disabled = false,
121
.next = *plugin_list };
124
.next = plugin_list };
122
125
123
126
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
127
if(new_plugin->argv == NULL){
125
128
free(copy_name);
126
129
free(new_plugin);
127
130
return NULL;
128
131
}
129
132
new_plugin->argv[0] = copy_name;
130
133
new_plugin->argv[1] = NULL;
131
134
132
135
new_plugin->environ = malloc(sizeof(char *));
133
136
if(new_plugin->environ == NULL){
134
137
free(copy_name);
137
140
return NULL;
138
141
}
139
142
new_plugin->environ[0] = NULL;
143
140
144
/* Append the new plugin to the list */
141
*plugin_list = new_plugin;
145
plugin_list = new_plugin;
142
146
return new_plugin;
143
147
}
144
148
174
178
}
175
179
176
180
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
181
static bool add_environment(plugin *p, const char *def, bool replace){
178
182
if(p == NULL){
179
183
return false;
180
184
}
185
/* namelen = length of name of environment variable */
186
size_t namelen = (size_t)(strchrnul(def, '=') - def);
187
/* Search for this environment variable */
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
190
/* It already exists */
191
if(replace){
192
char *new = realloc(*e, strlen(def) + 1);
193
if(new == NULL){
194
return false;
195
}
196
*e = new;
197
strcpy(*e, def);
198
}
199
return true;
200
}
201
}
181
202
return add_to_char_array(def, &(p->environ), &(p->envc));
182
203
}
183
204
184
185
205
/*
186
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
207
* Descriptor Flags".
188
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
189
209
*/
190
static int set_cloexec_flag(int fd)
191
{
210
static int set_cloexec_flag(int fd){
192
211
int ret = fcntl(fd, F_GETFD, 0);
193
212
/* If reading the flags failed, return error indication now. */
194
213
if(ret < 0){
198
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
199
218
}
200
219
201
process *process_list = NULL;
202
220
203
221
/* Mark processes as completed when they exit, and save their exit
204
222
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
223
static void handle_sigchld(__attribute__((unused)) int sig){
206
224
while(true){
207
process *proc = process_list;
225
plugin *proc = plugin_list;
208
226
int status;
209
227
pid_t pid = waitpid(-1, &status, WNOHANG);
210
228
if(pid == 0){
212
230
break;
213
231
}
214
232
if(pid == -1){
215
if (errno != ECHILD){
233
if(errno != ECHILD){
216
234
perror("waitpid");
217
235
}
218
236
/* No child processes */
219
237
break;
220
238
}
221
239
222
240
/* A child exited, find it in process_list */
223
241
while(proc != NULL and proc->pid != pid){
224
242
proc = proc->next;
232
250
}
233
251
}
234
252
235
bool print_out_password(const char *buffer, size_t length){
253
/* Prints out a password to stdout */
254
static bool print_out_password(const char *buffer, size_t length){
236
255
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
256
for(size_t written = 0; written < length; written += (size_t)ret){
241
257
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
258
length - written));
247
263
return true;
248
264
}
249
265
250
char **add_to_argv(char **argv, int *argc, char *arg){
251
if (argv == NULL){
252
*argc = 1;
253
argv = malloc(sizeof(char*) * 2);
254
if(argv == NULL){
255
return NULL;
266
/* Removes and free a plugin from the plugin list */
267
static void free_plugin(plugin *plugin_node){
268
269
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
270
free(*arg);
271
}
272
free(plugin_node->argv);
273
for(char **env = plugin_node->environ; *env != NULL; env++){
274
free(*env);
275
}
276
free(plugin_node->environ);
277
free(plugin_node->buffer);
278
279
/* Removes the plugin from the singly-linked list */
280
if(plugin_node == plugin_list){
281
/* First one - simple */
282
plugin_list = plugin_list->next;
283
} else {
284
/* Second one or later */
285
for(plugin *p = plugin_list; p != NULL; p = p->next){
286
if(p->next == plugin_node){
287
p->next = plugin_node->next;
288
break;
289
}
256
290
}
257
argv[0] = NULL; /* Will be set to argv[0] in main before
258
parsing */
259
argv[1] = NULL;
260
}
261
*argc += 1;
262
argv = realloc(argv, sizeof(char *)
263
* ((unsigned int) *argc + 1));
264
if(argv == NULL){
265
return NULL;
266
}
267
argv[*argc-1] = arg;
268
argv[*argc] = NULL;
269
return argv;
291
}
292
293
free(plugin_node);
270
294
}
271
295
272
static void free_plugin_list(plugin *plugin_list){
273
for(plugin *next; plugin_list != NULL; plugin_list = next){
274
next = plugin_list->next;
275
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
276
free(*arg);
277
}
278
free(plugin_list->argv);
279
for(char **env = plugin_list->environ; *env != NULL; env++){
280
free(*env);
281
}
282
free(plugin_list->environ);
283
free(plugin_list);
296
static void free_plugin_list(void){
297
while(plugin_list != NULL){
298
free_plugin(plugin_list);
284
299
}
285
300
}
286
301
287
302
int main(int argc, char *argv[]){
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
303
char *plugindir = NULL;
304
char *argfile = NULL;
290
305
FILE *conffp;
291
306
size_t d_name_len;
292
307
DIR *dir = NULL;
294
309
struct stat st;
295
310
fd_set rfds_all;
296
311
int ret, maxfd = 0;
312
ssize_t sret;
297
313
uid_t uid = 65534;
298
314
gid_t gid = 65534;
299
315
bool debug = false;
324
340
{ .name = "global-options", .key = 'g',
325
341
.arg = "OPTION[,OPTION[,...]]",
326
342
.doc = "Options passed to all plugins" },
327
{ .name = "global-envs", .key = 'e',
343
{ .name = "global-env", .key = 'G',
328
344
.arg = "VAR=value",
329
345
.doc = "Environment variable passed to all plugins" },
330
346
{ .name = "options-for", .key = 'o',
331
347
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
332
348
.doc = "Options passed only to specified plugin" },
333
{ .name = "envs-for", .key = 'f',
349
{ .name = "env-for", .key = 'E',
334
350
.arg = "PLUGIN:ENV=value",
335
351
.doc = "Environment variable passed to specified plugin" },
336
352
{ .name = "disable", .key = 'd',
337
353
.arg = "PLUGIN",
338
354
.doc = "Disable a specific plugin", .group = 1 },
355
{ .name = "enable", .key = 'e',
356
.arg = "PLUGIN",
357
.doc = "Enable a specific plugin", .group = 1 },
339
358
{ .name = "plugin-dir", .key = 128,
340
359
.arg = "DIRECTORY",
341
360
.doc = "Specify a different plugin directory", .group = 2 },
342
{ .name = "userid", .key = 129,
343
.arg = "ID", .flags = 0,
344
.doc = "User ID the plugins will run as", .group = 2 },
345
{ .name = "groupid", .key = 130,
346
.arg = "ID", .flags = 0,
347
.doc = "Group ID the plugins will run as", .group = 2 },
348
{ .name = "debug", .key = 131,
349
.doc = "Debug mode", .group = 3 },
361
{ .name = "config-file", .key = 129,
362
.arg = "FILE",
363
.doc = "Specify a different configuration file", .group = 2 },
364
{ .name = "userid", .key = 130,
365
.arg = "ID", .flags = 0,
366
.doc = "User ID the plugins will run as", .group = 3 },
367
{ .name = "groupid", .key = 131,
368
.arg = "ID", .flags = 0,
369
.doc = "Group ID the plugins will run as", .group = 3 },
370
{ .name = "debug", .key = 132,
371
.doc = "Debug mode", .group = 4 },
350
372
{ .name = NULL }
351
373
};
352
374
353
error_t parse_opt (int key, char *arg, struct argp_state *state) {
354
/* Get the INPUT argument from `argp_parse', which we know is a
355
pointer to our plugin list pointer. */
356
plugin **plugins = state->input;
357
switch (key) {
358
case 'g':
359
if (arg != NULL){
375
error_t parse_opt(int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
377
switch(key) {
378
case 'g': /* --global-options */
379
if(arg != NULL){
360
380
char *p;
361
381
while((p = strsep(&arg, ",")) != NULL){
362
382
if(p[0] == '\0'){
363
383
continue;
364
384
}
365
if(not add_argument(getplugin(NULL, plugins), p)){
385
if(not add_argument(getplugin(NULL), p)){
366
386
perror("add_argument");
367
387
return ARGP_ERR_UNKNOWN;
368
388
}
369
389
}
370
390
}
371
391
break;
372
case 'e':
392
case 'G': /* --global-env */
373
393
if(arg == NULL){
374
394
break;
375
395
}
376
{
377
char *envdef = strdup(arg);
378
if(envdef == NULL){
379
break;
380
}
381
if(not add_environment(getplugin(NULL, plugins), envdef)){
382
perror("add_environment");
383
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
384
398
}
385
399
break;
386
case 'o':
387
if (arg != NULL){
400
case 'o': /* --options-for */
401
if(arg != NULL){
388
402
char *p_name = strsep(&arg, ":");
389
if(p_name[0] == '\0'){
403
if(p_name[0] == '\0' or arg == NULL){
390
404
break;
391
405
}
392
406
char *opt = strsep(&arg, ":");
393
if(opt[0] == '\0'){
407
if(opt[0] == '\0' or opt == NULL){
394
408
break;
395
409
}
396
if(opt != NULL){
397
char *p;
398
while((p = strsep(&opt, ",")) != NULL){
399
if(p[0] == '\0'){
400
continue;
401
}
402
if(not add_argument(getplugin(p_name, plugins), p)){
403
perror("add_argument");
404
return ARGP_ERR_UNKNOWN;
405
}
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;
406
418
}
407
419
}
408
420
}
409
421
break;
410
case 'f':
422
case 'E': /* --env-for */
411
423
if(arg == NULL){
412
424
break;
413
425
}
416
428
if(envdef == NULL){
417
429
break;
418
430
}
419
char *p_name = strndup(arg, (size_t) (envdef-arg));
420
if(p_name == NULL){
421
break;
422
}
423
envdef++;
424
if(not add_environment(getplugin(p_name, plugins), envdef)){
431
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
425
433
perror("add_environment");
426
434
}
427
435
}
428
436
break;
429
case 'd':
430
if (arg != NULL){
431
plugin *p = getplugin(arg, plugins);
437
case 'd': /* --disable */
438
if(arg != NULL){
439
plugin *p = getplugin(arg);
432
440
if(p == NULL){
433
441
return ARGP_ERR_UNKNOWN;
434
442
}
435
443
p->disabled = true;
436
444
}
437
445
break;
438
case 128:
439
plugindir = arg;
440
break;
441
case 129:
442
uid = (uid_t)strtol(arg, NULL, 10);
443
break;
444
case 130:
445
gid = (gid_t)strtol(arg, NULL, 10);
446
break;
447
case 131:
446
case 'e': /* --enable */
447
if(arg != NULL){
448
plugin *p = getplugin(arg);
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
451
}
452
p->disabled = false;
453
}
454
break;
455
case 128: /* --plugin-dir */
456
free(plugindir);
457
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
461
break;
462
case 129: /* --config-file */
463
/* This is already done by parse_opt_config_file() */
464
break;
465
case 130: /* --userid */
466
/* In the GNU C library, uid_t is always unsigned int */
467
ret = sscanf(arg, "%u", &uid);
468
if(ret != 1){
469
fprintf(stderr, "Bad user ID number: \"%s\", using %u\n", arg,
470
uid);
471
}
472
break;
473
case 131: /* --groupid */
474
/* In the GNU C library, gid_t is always unsigned int */
475
ret = sscanf(arg, "%u", &gid);
476
if(ret != 1){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %u\n",
478
arg, gid);
479
}
480
break;
481
case 132: /* --debug */
448
482
debug = true;
449
483
break;
450
case ARGP_KEY_ARG:
451
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
452
break;
453
case ARGP_KEY_END:
454
break;
455
default:
456
return ARGP_ERR_UNKNOWN;
457
}
458
return 0;
459
}
460
461
plugin *plugin_list = NULL;
462
463
struct argp argp = { .options = options, .parser = parse_opt,
464
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
484
/*
485
* When adding more options before this line, remember to also add a
486
* "case" to the "parse_opt_config_file" function below.
487
*/
488
case ARGP_KEY_ARG:
489
/* Cryptsetup always passes an argument, which is an empty
490
string if "none" was specified in /etc/crypttab. So if
491
argument was empty, we ignore it silently. */
492
if(arg[0] != '\0'){
493
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
494
}
495
break;
496
case ARGP_KEY_END:
497
break;
498
default:
499
return ARGP_ERR_UNKNOWN;
500
}
501
return 0;
502
}
503
504
/* This option parser is the same as parse_opt() above, except it
505
ignores everything but the --config-file option. */
506
error_t parse_opt_config_file(int key, char *arg,
507
__attribute__((unused))
508
struct argp_state *state) {
509
switch(key) {
510
case 'g': /* --global-options */
511
case 'G': /* --global-env */
512
case 'o': /* --options-for */
513
case 'E': /* --env-for */
514
case 'd': /* --disable */
515
case 'e': /* --enable */
516
case 128: /* --plugin-dir */
517
break;
518
case 129: /* --config-file */
519
free(argfile);
520
argfile = strdup(arg);
521
if(argfile == NULL){
522
perror("strdup");
523
}
524
break;
525
case 130: /* --userid */
526
case 131: /* --groupid */
527
case 132: /* --debug */
528
case ARGP_KEY_ARG:
529
case ARGP_KEY_END:
530
break;
531
default:
532
return ARGP_ERR_UNKNOWN;
533
}
534
return 0;
535
}
536
537
struct argp argp = { .options = options,
538
.parser = parse_opt_config_file,
539
.args_doc = "",
465
540
.doc = "Mandos plugin runner -- Run plugins" };
466
541
467
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
468
if (ret == ARGP_ERR_UNKNOWN){
542
/* Parse using parse_opt_config_file() in order to get the custom
543
config file location, if any. */
544
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
545
if(ret == ARGP_ERR_UNKNOWN){
469
546
fprintf(stderr, "Unknown error while parsing arguments\n");
470
547
exitstatus = EXIT_FAILURE;
471
548
goto fallback;
472
549
}
473
474
conffp = fopen(argfile, "r");
550
551
/* Reset to the normal argument parser */
552
argp.parser = parse_opt;
553
554
/* Open the configfile if available */
555
if(argfile == NULL){
556
conffp = fopen(AFILE, "r");
557
} else {
558
conffp = fopen(argfile, "r");
559
}
475
560
if(conffp != NULL){
476
561
char *org_line = NULL;
477
562
char *p, *arg, *new_arg, *line;
478
563
size_t size = 0;
479
ssize_t sret;
480
564
const char whitespace_delims[] = " \r\t\f\v\n";
481
565
const char comment_delim[] = "#";
482
566
567
custom_argc = 1;
568
custom_argv = malloc(sizeof(char*) * 2);
569
if(custom_argv == NULL){
570
perror("malloc");
571
exitstatus = EXIT_FAILURE;
572
goto fallback;
573
}
574
custom_argv[0] = argv[0];
575
custom_argv[1] = NULL;
576
577
/* for each line in the config file, strip whitespace and ignore
578
commented text */
483
579
while(true){
484
580
sret = getline(&org_line, &size, conffp);
485
581
if(sret == -1){
493
589
continue;
494
590
}
495
591
new_arg = strdup(p);
496
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
497
if (custom_argv == NULL){
498
perror("add_to_argv");
499
exitstatus = EXIT_FAILURE;
500
goto fallback;
501
}
592
if(new_arg == NULL){
593
perror("strdup");
594
exitstatus = EXIT_FAILURE;
595
free(org_line);
596
goto fallback;
597
}
598
599
custom_argc += 1;
600
custom_argv = realloc(custom_argv, sizeof(char *)
601
* ((unsigned int) custom_argc + 1));
602
if(custom_argv == NULL){
603
perror("realloc");
604
exitstatus = EXIT_FAILURE;
605
free(org_line);
606
goto fallback;
607
}
608
custom_argv[custom_argc-1] = new_arg;
609
custom_argv[custom_argc] = NULL;
502
610
}
503
611
}
504
612
free(org_line);
505
} else{
613
} else {
506
614
/* Check for harmful errors and go to fallback. Other errors might
507
615
not affect opening plugins */
508
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
616
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
509
617
perror("fopen");
510
618
exitstatus = EXIT_FAILURE;
511
619
goto fallback;
512
620
}
513
621
}
514
622
/* If there was any arguments from configuration file,
623
pass them to parser as command arguments */
515
624
if(custom_argv != NULL){
516
custom_argv[0] = argv[0];
517
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,
518
&plugin_list);
519
if (ret == ARGP_ERR_UNKNOWN){
625
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
626
0, NULL);
627
if(ret == ARGP_ERR_UNKNOWN){
520
628
fprintf(stderr, "Unknown error while parsing arguments\n");
521
629
exitstatus = EXIT_FAILURE;
522
630
goto fallback;
523
631
}
524
632
}
525
633
634
/* Parse actual command line arguments, to let them override the
635
config file */
636
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
637
if(ret == ARGP_ERR_UNKNOWN){
638
fprintf(stderr, "Unknown error while parsing arguments\n");
639
exitstatus = EXIT_FAILURE;
640
goto fallback;
641
}
642
526
643
if(debug){
527
644
for(plugin *p = plugin_list; p != NULL; p=p->next){
528
645
fprintf(stderr, "Plugin: %s has %d arguments\n",
537
654
}
538
655
}
539
656
657
/* Strip permissions down to nobody */
540
658
ret = setuid(uid);
541
if (ret == -1){
659
if(ret == -1){
542
660
perror("setuid");
543
}
544
661
}
545
662
setgid(gid);
546
if (ret == -1){
663
if(ret == -1){
547
664
perror("setgid");
548
665
}
549
666
550
dir = opendir(plugindir);
667
if(plugindir == NULL){
668
dir = opendir(PDIR);
669
} else {
670
dir = opendir(plugindir);
671
}
672
551
673
if(dir == NULL){
552
674
perror("Could not open plugin dir");
553
675
exitstatus = EXIT_FAILURE;
569
691
570
692
FD_ZERO(&rfds_all);
571
693
694
/* Read and execute any executable in the plugin directory*/
572
695
while(true){
573
696
dirst = readdir(dir);
574
697
575
// All directory entries have been processed
698
/* All directory entries have been processed */
576
699
if(dirst == NULL){
577
if (errno == EBADF){
700
if(errno == EBADF){
578
701
perror("readdir");
579
702
exitstatus = EXIT_FAILURE;
580
703
goto fallback;
584
707
585
708
d_name_len = strlen(dirst->d_name);
586
709
587
// Ignore dotfiles, backup files and other junk
710
/* Ignore dotfiles, backup files and other junk */
588
711
{
589
712
bool bad_name = false;
590
713
592
715
593
716
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
594
717
".dpkg-old",
718
".dpkg-bak",
595
719
".dpkg-divert", NULL };
596
720
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
597
721
size_t pre_len = strlen(*pre);
605
729
break;
606
730
}
607
731
}
608
609
732
if(bad_name){
610
733
continue;
611
734
}
612
613
735
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
614
736
size_t suf_len = strlen(*suf);
615
737
if((d_name_len >= suf_len)
630
752
}
631
753
632
754
char *filename;
633
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
755
if(plugindir == NULL){
756
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
757
} else {
758
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
759
}
634
760
if(ret < 0){
635
761
perror("asprintf");
636
762
continue;
637
763
}
638
764
639
765
ret = stat(filename, &st);
640
if (ret == -1){
766
if(ret == -1){
641
767
perror("stat");
642
768
free(filename);
643
769
continue;
644
770
}
645
646
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
771
772
/* Ignore non-executable files */
773
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
647
774
if(debug){
648
775
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
649
776
" with bad type or mode\n", filename);
651
778
free(filename);
652
779
continue;
653
780
}
654
plugin *p = getplugin(dirst->d_name, &plugin_list);
781
782
plugin *p = getplugin(dirst->d_name);
655
783
if(p == NULL){
656
784
perror("getplugin");
657
785
free(filename);
667
795
}
668
796
{
669
797
/* Add global arguments to argument list for this plugin */
670
plugin *g = getplugin(NULL, &plugin_list);
798
plugin *g = getplugin(NULL);
671
799
if(g != NULL){
672
800
for(char **a = g->argv + 1; *a != NULL; a++){
673
801
if(not add_argument(p, *a)){
676
804
}
677
805
/* Add global environment variables */
678
806
for(char **e = g->environ; *e != NULL; e++){
679
if(not add_environment(p, *e)){
807
if(not add_environment(p, *e, false)){
680
808
perror("add_environment");
681
809
}
682
810
}
687
815
process, too. */
688
816
if(p->environ[0] != NULL){
689
817
for(char **e = environ; *e != NULL; e++){
690
char *copy = strdup(*e);
691
if(copy == NULL){
692
perror("strdup");
693
continue;
694
}
695
if(not add_environment(p, copy)){
818
if(not add_environment(p, *e, false)){
696
819
perror("add_environment");
697
820
}
698
821
}
700
823
701
824
int pipefd[2];
702
825
ret = pipe(pipefd);
703
if (ret == -1){
826
if(ret == -1){
704
827
perror("pipe");
705
828
exitstatus = EXIT_FAILURE;
706
829
goto fallback;
707
830
}
831
/* Ask OS to automatic close the pipe on exec */
708
832
ret = set_cloexec_flag(pipefd[0]);
709
833
if(ret < 0){
710
834
perror("set_cloexec_flag");
718
842
goto fallback;
719
843
}
720
844
/* Block SIGCHLD until process is safely in process list */
721
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
845
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
722
846
if(ret < 0){
723
847
perror("sigprocmask");
724
848
exitstatus = EXIT_FAILURE;
725
849
goto fallback;
726
850
}
727
// Starting a new process to be watched
851
/* Starting a new process to be watched */
728
852
pid_t pid = fork();
729
853
if(pid == -1){
730
854
perror("fork");
738
862
perror("sigaction");
739
863
_exit(EXIT_FAILURE);
740
864
}
741
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
865
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
742
866
if(ret < 0){
743
867
perror("sigprocmask");
744
868
_exit(EXIT_FAILURE);
745
869
}
746
870
747
871
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
748
872
if(ret == -1){
749
873
perror("dup2");
768
892
}
769
893
/* no return */
770
894
}
771
/* parent process */
895
/* Parent process */
896
close(pipefd[1]); /* Close unused write end of pipe */
772
897
free(filename);
773
close(pipefd[1]); /* close unused write end of pipe */
774
process *new_process = malloc(sizeof(process));
775
if (new_process == NULL){
776
perror("malloc");
777
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
898
plugin *new_plugin = getplugin(dirst->d_name);
899
if(new_plugin == NULL){
900
perror("getplugin");
901
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
778
902
if(ret < 0){
779
perror("sigprocmask");
903
perror("sigprocmask");
780
904
}
781
905
exitstatus = EXIT_FAILURE;
782
906
goto fallback;
783
907
}
784
908
785
*new_process = (struct process){ .pid = pid,
786
.fd = pipefd[0],
787
.next = process_list };
788
// List handling
789
process_list = new_process;
909
new_plugin->pid = pid;
910
new_plugin->fd = pipefd[0];
911
790
912
/* Unblock SIGCHLD so signal handler can be run if this process
791
913
has already completed */
792
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
914
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
793
915
if(ret < 0){
794
916
perror("sigprocmask");
795
917
exitstatus = EXIT_FAILURE;
796
918
goto fallback;
797
919
}
798
920
799
FD_SET(new_process->fd, &rfds_all);
921
FD_SET(new_plugin->fd, &rfds_all);
800
922
801
if (maxfd < new_process->fd){
802
maxfd = new_process->fd;
923
if(maxfd < new_plugin->fd){
924
maxfd = new_plugin->fd;
803
925
}
804
805
926
}
806
927
807
free_plugin_list(plugin_list);
808
plugin_list = NULL;
809
810
928
closedir(dir);
811
929
dir = NULL;
812
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
815
" directory?\n");
816
process_list = NULL;
930
931
for(plugin *p = plugin_list; p != NULL; p = p->next){
932
if(p->pid != 0){
933
break;
934
}
935
if(p->next == NULL){
936
fprintf(stderr, "No plugin processes started. Incorrect plugin"
937
" directory?\n");
938
free_plugin_list();
939
}
817
940
}
818
while(process_list){
941
942
/* Main loop while running plugins exist */
943
while(plugin_list){
819
944
fd_set rfds = rfds_all;
820
945
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
821
if (select_ret == -1){
946
if(select_ret == -1){
822
947
perror("select");
823
948
exitstatus = EXIT_FAILURE;
824
949
goto fallback;
825
950
}
826
951
/* OK, now either a process completed, or something can be read
827
952
from one of them */
828
for(process *proc = process_list; proc ; proc = proc->next){
953
for(plugin *proc = plugin_list; proc != NULL;){
829
954
/* Is this process completely done? */
830
955
if(proc->eof and proc->completed){
831
956
/* Only accept the plugin output if it exited cleanly */
832
957
if(not WIFEXITED(proc->status)
833
958
or WEXITSTATUS(proc->status) != 0){
834
959
/* Bad exit by plugin */
960
835
961
if(debug){
836
962
if(WIFEXITED(proc->status)){
837
963
fprintf(stderr, "Plugin %u exited with status %d\n",
842
968
(unsigned int) (proc->pid),
843
969
WTERMSIG(proc->status));
844
970
} else if(WCOREDUMP(proc->status)){
845
fprintf(stderr, "Plugin %d dumped core\n",
971
fprintf(stderr, "Plugin %u dumped core\n",
846
972
(unsigned int) (proc->pid));
847
973
}
848
974
}
975
849
976
/* Remove the plugin */
850
977
FD_CLR(proc->fd, &rfds_all);
978
851
979
/* Block signal while modifying process_list */
852
980
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
981
if(ret < 0){
855
983
exitstatus = EXIT_FAILURE;
856
984
goto fallback;
857
985
}
858
/* Delete this process entry from the list */
859
if(process_list == proc){
860
/* First one - simple */
861
process_list = proc->next;
862
} else {
863
/* Second one or later */
864
for(process *p = process_list; p != NULL; p = p->next){
865
if(p->next == proc){
866
p->next = proc->next;
867
break;
868
}
869
}
870
}
986
987
plugin *next_plugin = proc->next;
988
free_plugin(proc);
989
proc = next_plugin;
990
871
991
/* We are done modifying process list, so unblock signal */
872
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
873
NULL);
992
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
993
NULL);
874
994
if(ret < 0){
875
995
perror("sigprocmask");
876
}
877
free(proc->buffer);
878
free(proc);
879
/* We deleted this process from the list, so we can't go
880
proc->next. Therefore, start over from the beginning of
881
the process list */
882
break;
996
exitstatus = EXIT_FAILURE;
997
goto fallback;
998
}
999
1000
if(plugin_list == NULL){
1001
break;
1002
}
1003
1004
continue;
883
1005
}
1006
884
1007
/* This process exited nicely, so print its buffer */
885
1008
886
1009
bool bret = print_out_password(proc->buffer,
887
1010
proc->buffer_length);
888
1011
if(not bret){
891
1014
}
892
1015
goto fallback;
893
1016
}
1017
894
1018
/* This process has not completed. Does it have any output? */
895
1019
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
896
1020
/* This process had nothing to say at this time */
1021
proc = proc->next;
897
1022
continue;
898
1023
}
899
1024
/* Before reading, make the process' data buffer large enough */
900
1025
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
901
1026
proc->buffer = realloc(proc->buffer, proc->buffer_size
902
1027
+ (size_t) BUFFER_SIZE);
903
if (proc->buffer == NULL){
1028
if(proc->buffer == NULL){
904
1029
perror("malloc");
905
1030
exitstatus = EXIT_FAILURE;
906
1031
goto fallback;
908
1033
proc->buffer_size += BUFFER_SIZE;
909
1034
}
910
1035
/* Read from the process */
911
ret = read(proc->fd, proc->buffer + proc->buffer_length,
912
BUFFER_SIZE);
913
if(ret < 0){
1036
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1037
BUFFER_SIZE);
1038
if(sret < 0){
914
1039
/* Read error from this process; ignore the error */
1040
proc = proc->next;
915
1041
continue;
916
1042
}
917
if(ret == 0){
1043
if(sret == 0){
918
1044
/* got EOF */
919
1045
proc->eof = true;
920
1046
} else {
921
proc->buffer_length += (size_t) ret;
1047
proc->buffer_length += (size_t) sret;
922
1048
}
923
1049
}
924
1050
}
926
1052
927
1053
fallback:
928
1054
929
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1055
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
930
1056
/* Fallback if all plugins failed, none are found or an error
931
1057
occured */
932
1058
bool bret;
933
1059
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
934
1060
char *passwordbuffer = getpass("Password: ");
935
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1061
size_t len = strlen(passwordbuffer);
1062
/* Strip trailing newline */
1063
if(len > 0 and passwordbuffer[len-1] == '\n'){
1064
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1065
len--;
1066
}
1067
bret = print_out_password(passwordbuffer, len);
936
1068
if(not bret){
937
1069
perror("print_out_password");
938
1070
exitstatus = EXIT_FAILURE;
945
1077
perror("sigaction");
946
1078
exitstatus = EXIT_FAILURE;
947
1079
}
948
1080
949
1081
if(custom_argv != NULL){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
1082
for(char **arg = custom_argv+1; *arg != NULL; arg++){
951
1083
free(*arg);
952
1084
}
953
1085
free(custom_argv);
954
1086
}
955
free_plugin_list(plugin_list);
956
1087
957
1088
if(dir != NULL){
958
1089
closedir(dir);
959
1090
}
960
1091
961
/* Free the process list and kill the processes */
962
for(process *next; process_list != NULL; process_list = next){
963
next = process_list->next;
964
close(process_list->fd);
965
ret = kill(process_list->pid, SIGTERM);
966
if(ret == -1 and errno != ESRCH){
967
/* set-uid proccesses migth not get closed */
968
perror("kill");
1092
/* Kill the processes */
1093
for(plugin *p = plugin_list; p != NULL; p = p->next){
1094
if(p->pid != 0){
1095
close(p->fd);
1096
ret = kill(p->pid, SIGTERM);
1097
if(ret == -1 and errno != ESRCH){
1098
/* Set-uid proccesses might not get closed */
1099
perror("kill");
1100
}
969
1101
}
970
free(process_list->buffer);
971
free(process_list);
972
1102
}
973
1103
974
1104
/* Wait for any remaining child processes to terminate */
979
1109
perror("wait");
980
1110
}
981
1111
1112
free_plugin_list();
1113
1114
free(plugindir);
1115
free(argfile);
1116
982
1117
return exitstatus;
983
1118
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0