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- Committer: Teddy Hogeborn
- Date: 2008-08-24 23:33:02 UTC
- mfrom: (24.1.65 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080824233302-kfu4g2pkozg7xrmz
* plugin-runner.c (process): Set "completed" and "status" as volatile.
(handle_sigchld): Bug fix: reset proc to process_list every time.
(handle_sigchld): Bug fix: reset proc to process_list every time.
- 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,
62
61
#include <signal.h> /* struct sigaction, sigemptyset(),
63
62
sigaddset(), sigaction(),
64
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
64
SIG_UNBLOCK, kill() */
67
65
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
69
66
70
67
#define BUFFER_SIZE 256
71
72
#define PDIR "/lib/mandos/plugins.d"
73
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
75
const char *argp_program_version = "plugin-runner " VERSION;
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
76
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
77
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
78
87
typedef struct plugin{
79
88
char *name; /* can be NULL or any plugin name */
80
89
char **argv;
82
91
char **environ;
83
92
int envc;
84
93
bool disabled;
85
86
/* Variables used for running processes*/
87
pid_t pid;
88
int fd;
89
char *buffer;
90
size_t buffer_size;
91
size_t buffer_length;
92
bool eof;
93
volatile sig_atomic_t completed;
94
int status;
95
94
struct plugin *next;
96
95
} plugin;
97
96
98
static plugin *plugin_list = NULL;
99
100
/* Gets an existing plugin based on name,
101
or if none is found, creates a new one */
102
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
if((p->name == name)
106
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
107
101
return p;
108
102
}
109
103
}
110
104
/* Create a new plugin */
111
105
plugin *new_plugin = malloc(sizeof(plugin));
112
if(new_plugin == NULL){
106
if (new_plugin == NULL){
113
107
return NULL;
114
108
}
115
109
char *copy_name = NULL;
116
110
if(name != NULL){
117
111
copy_name = strdup(name);
118
112
if(copy_name == NULL){
119
free(new_plugin);
120
113
return NULL;
121
114
}
122
115
}
123
116
124
*new_plugin = (plugin){ .name = copy_name,
125
.argc = 1,
126
.disabled = false,
127
.next = plugin_list };
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
128
122
129
123
new_plugin->argv = malloc(sizeof(char *) * 2);
130
if(new_plugin->argv == NULL){
124
if (new_plugin->argv == NULL){
131
125
free(copy_name);
132
126
free(new_plugin);
133
127
return NULL;
134
128
}
135
129
new_plugin->argv[0] = copy_name;
136
130
new_plugin->argv[1] = NULL;
137
131
138
132
new_plugin->environ = malloc(sizeof(char *));
139
133
if(new_plugin->environ == NULL){
140
134
free(copy_name);
143
137
return NULL;
144
138
}
145
139
new_plugin->environ[0] = NULL;
146
147
140
/* Append the new plugin to the list */
148
plugin_list = new_plugin;
141
*plugin_list = new_plugin;
149
142
return new_plugin;
150
143
}
151
144
181
174
}
182
175
183
176
/* Add to a plugin's environment */
184
static bool add_environment(plugin *p, const char *def, bool replace){
177
static bool add_environment(plugin *p, const char *def){
185
178
if(p == NULL){
186
179
return false;
187
180
}
188
/* namelen = length of name of environment variable */
189
size_t namelen = (size_t)(strchrnul(def, '=') - def);
190
/* Search for this environment variable */
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
193
/* It already exists */
194
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
196
if(new == NULL){
197
return false;
198
}
199
*e = new;
200
strcpy(*e, def);
201
}
202
return true;
203
}
204
}
205
181
return add_to_char_array(def, &(p->environ), &(p->envc));
206
182
}
207
183
184
208
185
/*
209
186
* Based on the example in the GNU LibC manual chapter 13.13 "File
210
187
* Descriptor Flags".
211
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
212
189
*/
213
static int set_cloexec_flag(int fd){
190
static int set_cloexec_flag(int fd)
191
{
214
192
int ret = fcntl(fd, F_GETFD, 0);
215
193
/* If reading the flags failed, return error indication now. */
216
194
if(ret < 0){
220
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
221
199
}
222
200
201
process *process_list = NULL;
223
202
224
203
/* Mark processes as completed when they exit, and save their exit
225
204
status. */
226
static void handle_sigchld(__attribute__((unused)) int sig){
227
int old_errno = errno;
205
void handle_sigchld(__attribute__((unused)) int sig){
228
206
while(true){
229
plugin *proc = plugin_list;
207
process *proc = process_list;
230
208
int status;
231
209
pid_t pid = waitpid(-1, &status, WNOHANG);
232
210
if(pid == 0){
234
212
break;
235
213
}
236
214
if(pid == -1){
237
if(errno == ECHILD){
238
/* No child processes */
239
break;
215
if (errno != ECHILD){
216
perror("waitpid");
240
217
}
241
perror("waitpid");
218
/* No child processes */
219
break;
242
220
}
243
221
244
222
/* A child exited, find it in process_list */
245
223
while(proc != NULL and proc->pid != pid){
246
224
proc = proc->next;
250
228
continue;
251
229
}
252
230
proc->status = status;
253
proc->completed = 1;
231
proc->completed = true;
254
232
}
255
errno = old_errno;
256
233
}
257
234
258
/* Prints out a password to stdout */
259
static bool print_out_password(const char *buffer, size_t length){
235
bool print_out_password(const char *buffer, size_t length){
260
236
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
261
240
for(size_t written = 0; written < length; written += (size_t)ret){
262
241
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
242
length - written));
268
247
return true;
269
248
}
270
249
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
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;
295
256
}
296
}
297
298
free(plugin_node);
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;
299
270
}
300
271
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
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);
304
284
}
305
285
}
306
286
307
287
int main(int argc, char *argv[]){
308
char *plugindir = NULL;
309
char *argfile = NULL;
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
310
290
FILE *conffp;
311
291
size_t d_name_len;
312
292
DIR *dir = NULL;
314
294
struct stat st;
315
295
fd_set rfds_all;
316
296
int ret, maxfd = 0;
317
ssize_t sret;
318
intmax_t tmpmax;
319
297
uid_t uid = 65534;
320
298
gid_t gid = 65534;
321
299
bool debug = false;
346
324
{ .name = "global-options", .key = 'g',
347
325
.arg = "OPTION[,OPTION[,...]]",
348
326
.doc = "Options passed to all plugins" },
349
{ .name = "global-env", .key = 'G',
327
{ .name = "global-envs", .key = 'e',
350
328
.arg = "VAR=value",
351
329
.doc = "Environment variable passed to all plugins" },
352
330
{ .name = "options-for", .key = 'o',
353
331
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
354
332
.doc = "Options passed only to specified plugin" },
355
{ .name = "env-for", .key = 'E',
333
{ .name = "envs-for", .key = 'f',
356
334
.arg = "PLUGIN:ENV=value",
357
335
.doc = "Environment variable passed to specified plugin" },
358
336
{ .name = "disable", .key = 'd',
359
337
.arg = "PLUGIN",
360
338
.doc = "Disable a specific plugin", .group = 1 },
361
{ .name = "enable", .key = 'e',
362
.arg = "PLUGIN",
363
.doc = "Enable a specific plugin", .group = 1 },
364
339
{ .name = "plugin-dir", .key = 128,
365
340
.arg = "DIRECTORY",
366
341
.doc = "Specify a different plugin directory", .group = 2 },
367
{ .name = "config-file", .key = 129,
368
.arg = "FILE",
369
.doc = "Specify a different configuration file", .group = 2 },
370
{ .name = "userid", .key = 130,
371
.arg = "ID", .flags = 0,
372
.doc = "User ID the plugins will run as", .group = 3 },
373
{ .name = "groupid", .key = 131,
374
.arg = "ID", .flags = 0,
375
.doc = "Group ID the plugins will run as", .group = 3 },
376
{ .name = "debug", .key = 132,
377
.doc = "Debug mode", .group = 4 },
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 },
378
350
{ .name = NULL }
379
351
};
380
352
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
383
char *tmp;
384
switch(key){
385
case 'g': /* --global-options */
386
if(arg != NULL){
387
char *plugin_option;
388
while((plugin_option = strsep(&arg, ",")) != NULL){
389
if(plugin_option[0] == '\0'){
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){
360
char *p;
361
while((p = strsep(&arg, ",")) != NULL){
362
if(p[0] == '\0'){
390
363
continue;
391
364
}
392
if(not add_argument(getplugin(NULL), plugin_option)){
365
if(not add_argument(getplugin(NULL, plugins), p)){
393
366
perror("add_argument");
394
367
return ARGP_ERR_UNKNOWN;
395
368
}
396
369
}
397
370
}
398
371
break;
399
case 'G': /* --global-env */
372
case 'e':
400
373
if(arg == NULL){
401
374
break;
402
375
}
403
if(not add_environment(getplugin(NULL), arg, true)){
404
perror("add_environment");
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
}
405
384
}
406
385
break;
407
case 'o': /* --options-for */
408
if(arg != NULL){
409
char *plugin_name = strsep(&arg, ":");
410
if(plugin_name[0] == '\0'){
411
break;
412
}
413
char *plugin_option;
414
while((plugin_option = strsep(&arg, ",")) != NULL){
415
if(not add_argument(getplugin(plugin_name), plugin_option)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
386
case 'o':
387
if (arg != NULL){
388
char *p_name = strsep(&arg, ":");
389
if(p_name[0] == '\0'){
390
break;
391
}
392
char *opt = strsep(&arg, ":");
393
if(opt[0] == '\0'){
394
break;
395
}
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
}
418
406
}
419
407
}
420
408
}
421
409
break;
422
case 'E': /* --env-for */
410
case 'f':
423
411
if(arg == NULL){
424
412
break;
425
413
}
428
416
if(envdef == NULL){
429
417
break;
430
418
}
431
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
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)){
433
425
perror("add_environment");
434
426
}
435
427
}
436
428
break;
437
case 'd': /* --disable */
438
if(arg != NULL){
439
plugin *p = getplugin(arg);
429
case 'd':
430
if (arg != NULL){
431
plugin *p = getplugin(arg, plugins);
440
432
if(p == NULL){
441
433
return ARGP_ERR_UNKNOWN;
442
434
}
443
435
p->disabled = true;
444
436
}
445
437
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 */
466
errno = 0;
467
tmpmax = strtoimax(arg, &tmp, 10);
468
if(errno != 0 or tmp == arg or *tmp != '\0'
469
or tmpmax != (uid_t)tmpmax){
470
fprintf(stderr, "Bad user ID number: \"%s\", using %"
471
PRIdMAX "\n", arg, (intmax_t)uid);
472
} else {
473
uid = (uid_t)tmpmax;
474
}
475
break;
476
case 131: /* --groupid */
477
errno = 0;
478
tmpmax = strtoimax(arg, &tmp, 10);
479
if(errno != 0 or tmp == arg or *tmp != '\0'
480
or tmpmax != (gid_t)tmpmax){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
gid = (gid_t)tmpmax;
485
}
486
break;
487
case 132: /* --debug */
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:
488
448
debug = true;
489
449
break;
490
/*
491
* When adding more options before this line, remember to also add a
492
* "case" to the "parse_opt_config_file" function below.
493
*/
494
case ARGP_KEY_ARG:
495
/* Cryptsetup always passes an argument, which is an empty
496
string if "none" was specified in /etc/crypttab. So if
497
argument was empty, we ignore it silently. */
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
500
}
501
break;
502
case ARGP_KEY_END:
503
break;
504
default:
505
return ARGP_ERR_UNKNOWN;
506
}
507
return 0;
508
}
509
510
/* This option parser is the same as parse_opt() above, except it
511
ignores everything but the --config-file option. */
512
error_t parse_opt_config_file(int key, char *arg,
513
__attribute__((unused))
514
struct argp_state *state){
515
switch(key){
516
case 'g': /* --global-options */
517
case 'G': /* --global-env */
518
case 'o': /* --options-for */
519
case 'E': /* --env-for */
520
case 'd': /* --disable */
521
case 'e': /* --enable */
522
case 128: /* --plugin-dir */
523
break;
524
case 129: /* --config-file */
525
free(argfile);
526
argfile = strdup(arg);
527
if(argfile == NULL){
528
perror("strdup");
529
}
530
break;
531
case 130: /* --userid */
532
case 131: /* --groupid */
533
case 132: /* --debug */
534
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
536
break;
537
default:
538
return ARGP_ERR_UNKNOWN;
539
}
540
return 0;
541
}
542
543
struct argp argp = { .options = options,
544
.parser = parse_opt_config_file,
545
.args_doc = "",
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]",
546
465
.doc = "Mandos plugin runner -- Run plugins" };
547
466
548
/* Parse using parse_opt_config_file() in order to get the custom
549
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
467
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
468
if (ret == ARGP_ERR_UNKNOWN){
552
469
fprintf(stderr, "Unknown error while parsing arguments\n");
553
470
exitstatus = EXIT_FAILURE;
554
471
goto fallback;
555
472
}
556
557
/* Reset to the normal argument parser */
558
argp.parser = parse_opt;
559
560
/* Open the configfile if available */
561
if(argfile == NULL){
562
conffp = fopen(AFILE, "r");
563
} else {
564
conffp = fopen(argfile, "r");
565
}
473
474
conffp = fopen(argfile, "r");
566
475
if(conffp != NULL){
567
476
char *org_line = NULL;
568
477
char *p, *arg, *new_arg, *line;
569
478
size_t size = 0;
479
ssize_t sret;
570
480
const char whitespace_delims[] = " \r\t\f\v\n";
571
481
const char comment_delim[] = "#";
572
573
custom_argc = 1;
574
custom_argv = malloc(sizeof(char*) * 2);
575
if(custom_argv == NULL){
576
perror("malloc");
577
exitstatus = EXIT_FAILURE;
578
goto fallback;
579
}
580
custom_argv[0] = argv[0];
581
custom_argv[1] = NULL;
582
583
/* for each line in the config file, strip whitespace and ignore
584
commented text */
482
585
483
while(true){
586
484
sret = getline(&org_line, &size, conffp);
587
485
if(sret == -1){
588
486
break;
589
487
}
590
488
591
489
line = org_line;
592
490
arg = strsep(&line, comment_delim);
593
491
while((p = strsep(&arg, whitespace_delims)) != NULL){
595
493
continue;
596
494
}
597
495
new_arg = strdup(p);
598
if(new_arg == NULL){
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
601
free(org_line);
602
goto fallback;
603
}
604
605
custom_argc += 1;
606
custom_argv = realloc(custom_argv, sizeof(char *)
607
* ((unsigned int) custom_argc + 1));
608
if(custom_argv == NULL){
609
perror("realloc");
610
exitstatus = EXIT_FAILURE;
611
free(org_line);
612
goto fallback;
613
}
614
custom_argv[custom_argc-1] = new_arg;
615
custom_argv[custom_argc] = NULL;
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
}
616
502
}
617
503
}
618
504
free(org_line);
619
} else {
505
} else{
620
506
/* Check for harmful errors and go to fallback. Other errors might
621
507
not affect opening plugins */
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
508
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
509
perror("fopen");
624
510
exitstatus = EXIT_FAILURE;
625
511
goto fallback;
626
512
}
627
513
}
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
514
630
515
if(custom_argv != NULL){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
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){
634
520
fprintf(stderr, "Unknown error while parsing arguments\n");
635
521
exitstatus = EXIT_FAILURE;
636
522
goto fallback;
637
523
}
638
524
}
639
525
640
/* Parse actual command line arguments, to let them override the
641
config file */
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
646
goto fallback;
647
}
648
649
526
if(debug){
650
527
for(plugin *p = plugin_list; p != NULL; p=p->next){
651
528
fprintf(stderr, "Plugin: %s has %d arguments\n",
653
530
for(char **a = p->argv; *a != NULL; a++){
654
531
fprintf(stderr, "\tArg: %s\n", *a);
655
532
}
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
533
fprintf(stderr, "...and %u environment variables\n", p->envc);
657
534
for(char **a = p->environ; *a != NULL; a++){
658
535
fprintf(stderr, "\t%s\n", *a);
659
536
}
660
537
}
661
538
}
662
539
663
/* Strip permissions down to nobody */
540
ret = setuid(uid);
541
if (ret == -1){
542
perror("setuid");
543
}
544
664
545
setgid(gid);
665
if(ret == -1){
546
if (ret == -1){
666
547
perror("setgid");
667
548
}
668
ret = setuid(uid);
669
if(ret == -1){
670
perror("setuid");
671
}
672
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
677
}
678
549
550
dir = opendir(plugindir);
679
551
if(dir == NULL){
680
552
perror("Could not open plugin dir");
681
553
exitstatus = EXIT_FAILURE;
697
569
698
570
FD_ZERO(&rfds_all);
699
571
700
/* Read and execute any executable in the plugin directory*/
701
572
while(true){
702
573
dirst = readdir(dir);
703
574
704
/* All directory entries have been processed */
575
// All directory entries have been processed
705
576
if(dirst == NULL){
706
if(errno == EBADF){
577
if (errno == EBADF){
707
578
perror("readdir");
708
579
exitstatus = EXIT_FAILURE;
709
580
goto fallback;
713
584
714
585
d_name_len = strlen(dirst->d_name);
715
586
716
/* Ignore dotfiles, backup files and other junk */
587
// Ignore dotfiles, backup files and other junk
717
588
{
718
589
bool bad_name = false;
719
590
721
592
722
593
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
723
594
".dpkg-old",
724
".dpkg-bak",
725
595
".dpkg-divert", NULL };
726
596
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
727
597
size_t pre_len = strlen(*pre);
735
605
break;
736
606
}
737
607
}
608
738
609
if(bad_name){
739
610
continue;
740
611
}
612
741
613
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
742
614
size_t suf_len = strlen(*suf);
743
615
if((d_name_len >= suf_len)
756
628
continue;
757
629
}
758
630
}
759
631
760
632
char *filename;
761
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
763
} else {
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
765
}
633
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
634
if(ret < 0){
767
635
perror("asprintf");
768
636
continue;
769
637
}
770
638
771
639
ret = stat(filename, &st);
772
if(ret == -1){
640
if (ret == -1){
773
641
perror("stat");
774
642
free(filename);
775
643
continue;
776
644
}
777
645
778
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
646
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
780
647
if(debug){
781
648
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
782
649
" with bad type or mode\n", filename);
784
651
free(filename);
785
652
continue;
786
653
}
787
788
plugin *p = getplugin(dirst->d_name);
654
plugin *p = getplugin(dirst->d_name, &plugin_list);
789
655
if(p == NULL){
790
656
perror("getplugin");
791
657
free(filename);
801
667
}
802
668
{
803
669
/* Add global arguments to argument list for this plugin */
804
plugin *g = getplugin(NULL);
670
plugin *g = getplugin(NULL, &plugin_list);
805
671
if(g != NULL){
806
672
for(char **a = g->argv + 1; *a != NULL; a++){
807
673
if(not add_argument(p, *a)){
810
676
}
811
677
/* Add global environment variables */
812
678
for(char **e = g->environ; *e != NULL; e++){
813
if(not add_environment(p, *e, false)){
679
if(not add_environment(p, *e)){
814
680
perror("add_environment");
815
681
}
816
682
}
821
687
process, too. */
822
688
if(p->environ[0] != NULL){
823
689
for(char **e = environ; *e != NULL; e++){
824
if(not add_environment(p, *e, false)){
690
char *copy = strdup(*e);
691
if(copy == NULL){
692
perror("strdup");
693
continue;
694
}
695
if(not add_environment(p, copy)){
825
696
perror("add_environment");
826
697
}
827
698
}
829
700
830
701
int pipefd[2];
831
702
ret = pipe(pipefd);
832
if(ret == -1){
703
if (ret == -1){
833
704
perror("pipe");
834
705
exitstatus = EXIT_FAILURE;
835
706
goto fallback;
836
707
}
837
/* Ask OS to automatic close the pipe on exec */
838
708
ret = set_cloexec_flag(pipefd[0]);
839
709
if(ret < 0){
840
710
perror("set_cloexec_flag");
848
718
goto fallback;
849
719
}
850
720
/* Block SIGCHLD until process is safely in process list */
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
721
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
852
722
if(ret < 0){
853
723
perror("sigprocmask");
854
724
exitstatus = EXIT_FAILURE;
855
725
goto fallback;
856
726
}
857
/* Starting a new process to be watched */
727
// Starting a new process to be watched
858
728
pid_t pid = fork();
859
729
if(pid == -1){
860
730
perror("fork");
868
738
perror("sigaction");
869
739
_exit(EXIT_FAILURE);
870
740
}
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
741
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
742
if(ret < 0){
873
743
perror("sigprocmask");
874
744
_exit(EXIT_FAILURE);
875
745
}
876
746
877
747
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
878
748
if(ret == -1){
879
749
perror("dup2");
898
768
}
899
769
/* no return */
900
770
}
901
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
771
/* parent process */
903
772
free(filename);
904
plugin *new_plugin = getplugin(dirst->d_name);
905
if(new_plugin == NULL){
906
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
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);
908
778
if(ret < 0){
909
perror("sigprocmask");
779
perror("sigprocmask");
910
780
}
911
781
exitstatus = EXIT_FAILURE;
912
782
goto fallback;
913
783
}
914
784
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
917
785
*new_process = (struct process){ .pid = pid,
786
.fd = pipefd[0],
787
.next = process_list };
788
// List handling
789
process_list = new_process;
918
790
/* Unblock SIGCHLD so signal handler can be run if this process
919
791
has already completed */
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
792
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
921
793
if(ret < 0){
922
794
perror("sigprocmask");
923
795
exitstatus = EXIT_FAILURE;
924
796
goto fallback;
925
797
}
926
798
927
FD_SET(new_plugin->fd, &rfds_all);
799
FD_SET(new_process->fd, &rfds_all);
928
800
929
if(maxfd < new_plugin->fd){
930
maxfd = new_plugin->fd;
801
if (maxfd < new_process->fd){
802
maxfd = new_process->fd;
931
803
}
804
932
805
}
933
806
807
free_plugin_list(plugin_list);
808
plugin_list = NULL;
809
934
810
closedir(dir);
935
811
dir = NULL;
936
free_plugin(getplugin(NULL));
937
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
if(p->pid != 0){
940
break;
941
}
942
if(p->next == NULL){
943
fprintf(stderr, "No plugin processes started. Incorrect plugin"
944
" directory?\n");
945
free_plugin_list();
946
}
812
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
815
" directory?\n");
816
process_list = NULL;
947
817
}
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
818
while(process_list){
951
819
fd_set rfds = rfds_all;
952
820
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
953
if(select_ret == -1){
821
if (select_ret == -1){
954
822
perror("select");
955
823
exitstatus = EXIT_FAILURE;
956
824
goto fallback;
957
825
}
958
826
/* OK, now either a process completed, or something can be read
959
827
from one of them */
960
for(plugin *proc = plugin_list; proc != NULL;){
828
for(process *proc = process_list; proc ; proc = proc->next){
961
829
/* Is this process completely done? */
962
if(proc->completed and proc->eof){
830
if(proc->eof and proc->completed){
963
831
/* Only accept the plugin output if it exited cleanly */
964
832
if(not WIFEXITED(proc->status)
965
833
or WEXITSTATUS(proc->status) != 0){
966
834
/* Bad exit by plugin */
967
968
835
if(debug){
969
836
if(WIFEXITED(proc->status)){
970
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
971
" status %d\n", proc->name,
972
(intmax_t) (proc->pid),
837
fprintf(stderr, "Plugin %u exited with status %d\n",
838
(unsigned int) (proc->pid),
973
839
WEXITSTATUS(proc->status));
974
} else if(WIFSIGNALED(proc->status)){
975
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
976
" signal %d\n", proc->name,
977
(intmax_t) (proc->pid),
840
} else if(WIFSIGNALED(proc->status)) {
841
fprintf(stderr, "Plugin %u killed by signal %d\n",
842
(unsigned int) (proc->pid),
978
843
WTERMSIG(proc->status));
979
844
} else if(WCOREDUMP(proc->status)){
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
981
" core\n", proc->name, (intmax_t) (proc->pid));
845
fprintf(stderr, "Plugin %d dumped core\n",
846
(unsigned int) (proc->pid));
982
847
}
983
848
}
984
985
849
/* Remove the plugin */
986
850
FD_CLR(proc->fd, &rfds_all);
987
988
851
/* Block signal while modifying process_list */
989
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
990
853
if(ret < 0){
992
855
exitstatus = EXIT_FAILURE;
993
856
goto fallback;
994
857
}
995
996
plugin *next_plugin = proc->next;
997
free_plugin(proc);
998
proc = next_plugin;
999
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
}
1000
871
/* We are done modifying process list, so unblock signal */
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
872
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
873
NULL);
1003
874
if(ret < 0){
1004
875
perror("sigprocmask");
1005
exitstatus = EXIT_FAILURE;
1006
goto fallback;
1007
}
1008
1009
if(plugin_list == NULL){
1010
break;
1011
}
1012
1013
continue;
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;
1014
883
}
1015
1016
884
/* This process exited nicely, so print its buffer */
1017
885
1018
886
bool bret = print_out_password(proc->buffer,
1019
887
proc->buffer_length);
1020
888
if(not bret){
1023
891
}
1024
892
goto fallback;
1025
893
}
1026
1027
894
/* This process has not completed. Does it have any output? */
1028
895
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1029
896
/* This process had nothing to say at this time */
1030
proc = proc->next;
1031
897
continue;
1032
898
}
1033
899
/* Before reading, make the process' data buffer large enough */
1034
900
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1035
901
proc->buffer = realloc(proc->buffer, proc->buffer_size
1036
902
+ (size_t) BUFFER_SIZE);
1037
if(proc->buffer == NULL){
903
if (proc->buffer == NULL){
1038
904
perror("malloc");
1039
905
exitstatus = EXIT_FAILURE;
1040
906
goto fallback;
1042
908
proc->buffer_size += BUFFER_SIZE;
1043
909
}
1044
910
/* Read from the process */
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1047
if(sret < 0){
911
ret = read(proc->fd, proc->buffer + proc->buffer_length,
912
BUFFER_SIZE);
913
if(ret < 0){
1048
914
/* Read error from this process; ignore the error */
1049
proc = proc->next;
1050
915
continue;
1051
916
}
1052
if(sret == 0){
917
if(ret == 0){
1053
918
/* got EOF */
1054
919
proc->eof = true;
1055
920
} else {
1056
proc->buffer_length += (size_t) sret;
921
proc->buffer_length += (size_t) ret;
1057
922
}
1058
923
}
1059
924
}
1060
1061
925
926
1062
927
fallback:
1063
928
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
929
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1065
930
/* Fallback if all plugins failed, none are found or an error
1066
931
occured */
1067
932
bool bret;
1068
933
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1069
934
char *passwordbuffer = getpass("Password: ");
1070
size_t len = strlen(passwordbuffer);
1071
/* Strip trailing newline */
1072
if(len > 0 and passwordbuffer[len-1] == '\n'){
1073
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1074
len--;
1075
}
1076
bret = print_out_password(passwordbuffer, len);
935
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1077
936
if(not bret){
1078
937
perror("print_out_password");
1079
938
exitstatus = EXIT_FAILURE;
1086
945
perror("sigaction");
1087
946
exitstatus = EXIT_FAILURE;
1088
947
}
1089
948
1090
949
if(custom_argv != NULL){
1091
for(char **arg = custom_argv+1; *arg != NULL; arg++){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
1092
951
free(*arg);
1093
952
}
1094
953
free(custom_argv);
1095
954
}
955
free_plugin_list(plugin_list);
1096
956
1097
957
if(dir != NULL){
1098
958
closedir(dir);
1099
959
}
1100
960
1101
/* Kill the processes */
1102
for(plugin *p = plugin_list; p != NULL; p = p->next){
1103
if(p->pid != 0){
1104
close(p->fd);
1105
ret = kill(p->pid, SIGTERM);
1106
if(ret == -1 and errno != ESRCH){
1107
/* Set-uid proccesses might not get closed */
1108
perror("kill");
1109
}
961
/* 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");
1110
969
}
970
free(process_list->buffer);
971
free(process_list);
1111
972
}
1112
973
1113
974
/* Wait for any remaining child processes to terminate */
1118
979
perror("wait");
1119
980
}
1120
981
1121
free_plugin_list();
1122
1123
free(plugindir);
1124
free(argfile);
1125
1126
982
return exitstatus;
1127
983
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0