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- Committer: Teddy Hogeborn
- Date: 2009-02-15 09:28:06 UTC
- mto: (237.4.2 mandos-pipe-ipc) (24.1.137 mandos) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 252.
- Revision ID: teddy@fukt.bsnet.se-20090215092806-l0uq42v3j1rq3gmi
* INSTALL: Changed "Python 2.4" to "Python 2.5".
* mandos.lsm: - '' -
* mandos.lsm: - '' -
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
32
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
46
47
fcntl(), setuid(), setgid(),
47
48
F_GETFD, F_SETFD, FD_CLOEXEC,
48
49
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
dup2(), STDOUT_FILENO, _exit(),
50
51
execv(), write(), read(),
51
52
close() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
61
62
#include <signal.h> /* struct sigaction, sigemptyset(),
62
63
sigaddset(), sigaction(),
63
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
65
67
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
66
69
67
70
#define BUFFER_SIZE 256
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
71
72
#define PDIR "/lib/mandos/plugins.d"
73
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
75
const char *argp_program_version = "plugin-runner " VERSION;
71
76
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
77
73
struct process;
74
75
typedef struct process{
76
pid_t pid;
77
int fd;
78
char *buffer;
79
size_t buffer_size;
80
size_t buffer_length;
81
bool eof;
82
volatile bool completed;
83
volatile int status;
84
struct process *next;
85
} process;
86
87
78
typedef struct plugin{
88
79
char *name; /* can be NULL or any plugin name */
89
80
char **argv;
91
82
char **environ;
92
83
int envc;
93
84
bool disabled;
85
86
/* Variables used for running processes*/
87
pid_t pid;
88
int fd;
89
char *buffer;
90
size_t buffer_size;
91
size_t buffer_length;
92
bool eof;
93
volatile sig_atomic_t completed;
94
int status;
94
95
struct plugin *next;
95
96
} plugin;
96
97
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
99
if ((p->name == name)
100
or (p->name and name and (strcmp(p->name, name) == 0))){
98
static plugin *plugin_list = NULL;
99
100
/* Gets an existing plugin based on name,
101
or if none is found, creates a new one */
102
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
if((p->name == name)
106
or (p->name and name and (strcmp(p->name, name) == 0))){
101
107
return p;
102
108
}
103
109
}
104
110
/* Create a new plugin */
105
111
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
112
if(new_plugin == NULL){
107
113
return NULL;
108
114
}
109
115
char *copy_name = NULL;
110
116
if(name != NULL){
111
117
copy_name = strdup(name);
112
118
if(copy_name == NULL){
119
free(new_plugin);
113
120
return NULL;
114
121
}
115
122
}
116
123
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
124
*new_plugin = (plugin){ .name = copy_name,
125
.argc = 1,
126
.disabled = false,
127
.next = plugin_list };
122
128
123
129
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
130
if(new_plugin->argv == NULL){
125
131
free(copy_name);
126
132
free(new_plugin);
127
133
return NULL;
128
134
}
129
135
new_plugin->argv[0] = copy_name;
130
136
new_plugin->argv[1] = NULL;
131
137
132
138
new_plugin->environ = malloc(sizeof(char *));
133
139
if(new_plugin->environ == NULL){
134
140
free(copy_name);
137
143
return NULL;
138
144
}
139
145
new_plugin->environ[0] = NULL;
146
140
147
/* Append the new plugin to the list */
141
*plugin_list = new_plugin;
148
plugin_list = new_plugin;
142
149
return new_plugin;
143
150
}
144
151
174
181
}
175
182
176
183
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
184
static bool add_environment(plugin *p, const char *def, bool replace){
178
185
if(p == NULL){
179
186
return false;
180
187
}
188
/* namelen = length of name of environment variable */
189
size_t namelen = (size_t)(strchrnul(def, '=') - def);
190
/* Search for this environment variable */
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
193
/* It already exists */
194
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
196
if(new == NULL){
197
return false;
198
}
199
*e = new;
200
strcpy(*e, def);
201
}
202
return true;
203
}
204
}
181
205
return add_to_char_array(def, &(p->environ), &(p->envc));
182
206
}
183
207
184
185
208
/*
186
209
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
210
* Descriptor Flags".
188
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
189
212
*/
190
static int set_cloexec_flag(int fd)
191
{
213
static int set_cloexec_flag(int fd){
192
214
int ret = fcntl(fd, F_GETFD, 0);
193
215
/* If reading the flags failed, return error indication now. */
194
216
if(ret < 0){
198
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
199
221
}
200
222
201
process *process_list = NULL;
202
223
203
224
/* Mark processes as completed when they exit, and save their exit
204
225
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
226
static void handle_sigchld(__attribute__((unused)) int sig){
227
int old_errno = errno;
206
228
while(true){
207
process *proc = process_list;
229
plugin *proc = plugin_list;
208
230
int status;
209
231
pid_t pid = waitpid(-1, &status, WNOHANG);
210
232
if(pid == 0){
212
234
break;
213
235
}
214
236
if(pid == -1){
215
if (errno != ECHILD){
216
perror("waitpid");
237
if(errno == ECHILD){
238
/* No child processes */
239
break;
217
240
}
218
/* No child processes */
219
break;
241
perror("waitpid");
220
242
}
221
243
222
244
/* A child exited, find it in process_list */
223
245
while(proc != NULL and proc->pid != pid){
224
246
proc = proc->next;
228
250
continue;
229
251
}
230
252
proc->status = status;
231
proc->completed = true;
253
proc->completed = 1;
232
254
}
255
errno = old_errno;
233
256
}
234
257
235
bool print_out_password(const char *buffer, size_t length){
258
/* Prints out a password to stdout */
259
static bool print_out_password(const char *buffer, size_t length){
236
260
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
261
for(size_t written = 0; written < length; written += (size_t)ret){
241
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
263
length - written));
247
268
return true;
248
269
}
249
270
250
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;
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
}
256
295
}
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;
296
}
297
298
free(plugin_node);
270
299
}
271
300
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);
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
284
304
}
285
305
}
286
306
287
307
int main(int argc, char *argv[]){
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
308
char *plugindir = NULL;
309
char *argfile = NULL;
290
310
FILE *conffp;
291
311
size_t d_name_len;
292
312
DIR *dir = NULL;
294
314
struct stat st;
295
315
fd_set rfds_all;
296
316
int ret, maxfd = 0;
317
ssize_t sret;
318
intmax_t tmpmax;
297
319
uid_t uid = 65534;
298
320
gid_t gid = 65534;
299
321
bool debug = false;
324
346
{ .name = "global-options", .key = 'g',
325
347
.arg = "OPTION[,OPTION[,...]]",
326
348
.doc = "Options passed to all plugins" },
327
{ .name = "global-envs", .key = 'e',
349
{ .name = "global-env", .key = 'G',
328
350
.arg = "VAR=value",
329
351
.doc = "Environment variable passed to all plugins" },
330
352
{ .name = "options-for", .key = 'o',
331
353
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
332
354
.doc = "Options passed only to specified plugin" },
333
{ .name = "envs-for", .key = 'f',
355
{ .name = "env-for", .key = 'E',
334
356
.arg = "PLUGIN:ENV=value",
335
357
.doc = "Environment variable passed to specified plugin" },
336
358
{ .name = "disable", .key = 'd',
337
359
.arg = "PLUGIN",
338
360
.doc = "Disable a specific plugin", .group = 1 },
361
{ .name = "enable", .key = 'e',
362
.arg = "PLUGIN",
363
.doc = "Enable a specific plugin", .group = 1 },
339
364
{ .name = "plugin-dir", .key = 128,
340
365
.arg = "DIRECTORY",
341
366
.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 },
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 },
350
378
{ .name = NULL }
351
379
};
352
380
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'){
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'){
363
390
continue;
364
391
}
365
if(not add_argument(getplugin(NULL, plugins), p)){
392
if(not add_argument(getplugin(NULL), plugin_option)){
366
393
perror("add_argument");
367
394
return ARGP_ERR_UNKNOWN;
368
395
}
369
396
}
370
397
}
371
398
break;
372
case 'e':
399
case 'G': /* --global-env */
373
400
if(arg == NULL){
374
401
break;
375
402
}
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
}
403
if(not add_environment(getplugin(NULL), arg, true)){
404
perror("add_environment");
384
405
}
385
406
break;
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
}
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;
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
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 */
448
488
debug = true;
449
489
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]",
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 = "",
465
546
.doc = "Mandos plugin runner -- Run plugins" };
466
547
467
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
468
if (ret == ARGP_ERR_UNKNOWN){
548
/* Parse using parse_opt_config_file() in order to get the custom
549
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
469
552
fprintf(stderr, "Unknown error while parsing arguments\n");
470
553
exitstatus = EXIT_FAILURE;
471
554
goto fallback;
472
555
}
473
474
conffp = fopen(argfile, "r");
556
557
/* Reset to the normal argument parser */
558
argp.parser = parse_opt;
559
560
/* Open the configfile if available */
561
if(argfile == NULL){
562
conffp = fopen(AFILE, "r");
563
} else {
564
conffp = fopen(argfile, "r");
565
}
475
566
if(conffp != NULL){
476
567
char *org_line = NULL;
477
568
char *p, *arg, *new_arg, *line;
478
569
size_t size = 0;
479
ssize_t sret;
480
570
const char whitespace_delims[] = " \r\t\f\v\n";
481
571
const char comment_delim[] = "#";
482
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 */
483
585
while(true){
484
586
sret = getline(&org_line, &size, conffp);
485
587
if(sret == -1){
486
588
break;
487
589
}
488
590
489
591
line = org_line;
490
592
arg = strsep(&line, comment_delim);
491
593
while((p = strsep(&arg, whitespace_delims)) != NULL){
493
595
continue;
494
596
}
495
597
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
}
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;
502
616
}
503
617
}
504
618
free(org_line);
505
} else{
619
} else {
506
620
/* Check for harmful errors and go to fallback. Other errors might
507
621
not affect opening plugins */
508
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
509
623
perror("fopen");
510
624
exitstatus = EXIT_FAILURE;
511
625
goto fallback;
512
626
}
513
627
}
514
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
515
630
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){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
520
634
fprintf(stderr, "Unknown error while parsing arguments\n");
521
635
exitstatus = EXIT_FAILURE;
522
636
goto fallback;
523
637
}
524
638
}
525
639
640
/* Parse actual command line arguments, to let them override the
641
config file */
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
646
goto fallback;
647
}
648
526
649
if(debug){
527
650
for(plugin *p = plugin_list; p != NULL; p=p->next){
528
651
fprintf(stderr, "Plugin: %s has %d arguments\n",
530
653
for(char **a = p->argv; *a != NULL; a++){
531
654
fprintf(stderr, "\tArg: %s\n", *a);
532
655
}
533
fprintf(stderr, "...and %u environment variables\n", p->envc);
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
534
657
for(char **a = p->environ; *a != NULL; a++){
535
658
fprintf(stderr, "\t%s\n", *a);
536
659
}
537
660
}
538
661
}
539
662
663
/* Strip permissions down to nobody */
664
setgid(gid);
665
if(ret == -1){
666
perror("setgid");
667
}
540
668
ret = setuid(uid);
541
if (ret == -1){
669
if(ret == -1){
542
670
perror("setuid");
543
671
}
544
672
545
setgid(gid);
546
if (ret == -1){
547
perror("setgid");
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
548
677
}
549
678
550
dir = opendir(plugindir);
551
679
if(dir == NULL){
552
680
perror("Could not open plugin dir");
553
681
exitstatus = EXIT_FAILURE;
569
697
570
698
FD_ZERO(&rfds_all);
571
699
700
/* Read and execute any executable in the plugin directory*/
572
701
while(true){
573
702
dirst = readdir(dir);
574
703
575
// All directory entries have been processed
704
/* All directory entries have been processed */
576
705
if(dirst == NULL){
577
if (errno == EBADF){
706
if(errno == EBADF){
578
707
perror("readdir");
579
708
exitstatus = EXIT_FAILURE;
580
709
goto fallback;
584
713
585
714
d_name_len = strlen(dirst->d_name);
586
715
587
// Ignore dotfiles, backup files and other junk
716
/* Ignore dotfiles, backup files and other junk */
588
717
{
589
718
bool bad_name = false;
590
719
592
721
593
722
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
594
723
".dpkg-old",
724
".dpkg-bak",
595
725
".dpkg-divert", NULL };
596
726
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
597
727
size_t pre_len = strlen(*pre);
605
735
break;
606
736
}
607
737
}
608
609
738
if(bad_name){
610
739
continue;
611
740
}
612
613
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
614
742
size_t suf_len = strlen(*suf);
615
743
if((d_name_len >= suf_len)
628
756
continue;
629
757
}
630
758
}
631
759
632
760
char *filename;
633
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
761
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
763
} else {
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
765
}
634
766
if(ret < 0){
635
767
perror("asprintf");
636
768
continue;
637
769
}
638
770
639
771
ret = stat(filename, &st);
640
if (ret == -1){
772
if(ret == -1){
641
773
perror("stat");
642
774
free(filename);
643
775
continue;
644
776
}
645
777
646
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
778
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
647
780
if(debug){
648
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
649
782
" with bad type or mode\n", filename);
651
784
free(filename);
652
785
continue;
653
786
}
654
plugin *p = getplugin(dirst->d_name, &plugin_list);
787
788
plugin *p = getplugin(dirst->d_name);
655
789
if(p == NULL){
656
790
perror("getplugin");
657
791
free(filename);
667
801
}
668
802
{
669
803
/* Add global arguments to argument list for this plugin */
670
plugin *g = getplugin(NULL, &plugin_list);
804
plugin *g = getplugin(NULL);
671
805
if(g != NULL){
672
806
for(char **a = g->argv + 1; *a != NULL; a++){
673
807
if(not add_argument(p, *a)){
676
810
}
677
811
/* Add global environment variables */
678
812
for(char **e = g->environ; *e != NULL; e++){
679
if(not add_environment(p, *e)){
813
if(not add_environment(p, *e, false)){
680
814
perror("add_environment");
681
815
}
682
816
}
687
821
process, too. */
688
822
if(p->environ[0] != NULL){
689
823
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)){
824
if(not add_environment(p, *e, false)){
696
825
perror("add_environment");
697
826
}
698
827
}
700
829
701
830
int pipefd[2];
702
831
ret = pipe(pipefd);
703
if (ret == -1){
832
if(ret == -1){
704
833
perror("pipe");
705
834
exitstatus = EXIT_FAILURE;
706
835
goto fallback;
707
836
}
837
/* Ask OS to automatic close the pipe on exec */
708
838
ret = set_cloexec_flag(pipefd[0]);
709
839
if(ret < 0){
710
840
perror("set_cloexec_flag");
718
848
goto fallback;
719
849
}
720
850
/* Block SIGCHLD until process is safely in process list */
721
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
722
852
if(ret < 0){
723
853
perror("sigprocmask");
724
854
exitstatus = EXIT_FAILURE;
725
855
goto fallback;
726
856
}
727
// Starting a new process to be watched
857
/* Starting a new process to be watched */
728
858
pid_t pid = fork();
729
859
if(pid == -1){
730
860
perror("fork");
738
868
perror("sigaction");
739
869
_exit(EXIT_FAILURE);
740
870
}
741
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
742
872
if(ret < 0){
743
873
perror("sigprocmask");
744
874
_exit(EXIT_FAILURE);
745
875
}
746
876
747
877
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
748
878
if(ret == -1){
749
879
perror("dup2");
768
898
}
769
899
/* no return */
770
900
}
771
/* parent process */
901
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
772
903
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);
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);
778
908
if(ret < 0){
779
perror("sigprocmask");
909
perror("sigprocmask");
780
910
}
781
911
exitstatus = EXIT_FAILURE;
782
912
goto fallback;
783
913
}
784
914
785
*new_process = (struct process){ .pid = pid,
786
.fd = pipefd[0],
787
.next = process_list };
788
// List handling
789
process_list = new_process;
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
917
790
918
/* Unblock SIGCHLD so signal handler can be run if this process
791
919
has already completed */
792
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
793
921
if(ret < 0){
794
922
perror("sigprocmask");
795
923
exitstatus = EXIT_FAILURE;
796
924
goto fallback;
797
925
}
798
926
799
FD_SET(new_process->fd, &rfds_all);
927
FD_SET(new_plugin->fd, &rfds_all);
800
928
801
if (maxfd < new_process->fd){
802
maxfd = new_process->fd;
929
if(maxfd < new_plugin->fd){
930
maxfd = new_plugin->fd;
803
931
}
804
805
932
}
806
933
807
free_plugin_list(plugin_list);
808
plugin_list = NULL;
809
810
934
closedir(dir);
811
935
dir = NULL;
812
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
815
" directory?\n");
816
process_list = NULL;
936
free_plugin(getplugin(NULL));
937
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
if(p->pid != 0){
940
break;
941
}
942
if(p->next == NULL){
943
fprintf(stderr, "No plugin processes started. Incorrect plugin"
944
" directory?\n");
945
free_plugin_list();
946
}
817
947
}
818
while(process_list){
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
819
951
fd_set rfds = rfds_all;
820
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
821
if (select_ret == -1){
953
if(select_ret == -1){
822
954
perror("select");
823
955
exitstatus = EXIT_FAILURE;
824
956
goto fallback;
825
957
}
826
958
/* OK, now either a process completed, or something can be read
827
959
from one of them */
828
for(process *proc = process_list; proc ; proc = proc->next){
960
for(plugin *proc = plugin_list; proc != NULL;){
829
961
/* Is this process completely done? */
830
if(proc->eof and proc->completed){
962
if(proc->completed and proc->eof){
831
963
/* Only accept the plugin output if it exited cleanly */
832
964
if(not WIFEXITED(proc->status)
833
965
or WEXITSTATUS(proc->status) != 0){
834
966
/* Bad exit by plugin */
967
835
968
if(debug){
836
969
if(WIFEXITED(proc->status)){
837
fprintf(stderr, "Plugin %u exited with status %d\n",
838
(unsigned int) (proc->pid),
970
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
971
" status %d\n", proc->name,
972
(intmax_t) (proc->pid),
839
973
WEXITSTATUS(proc->status));
840
} else if(WIFSIGNALED(proc->status)) {
841
fprintf(stderr, "Plugin %u killed by signal %d\n",
842
(unsigned int) (proc->pid),
974
} else if(WIFSIGNALED(proc->status)){
975
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
976
" signal %d\n", proc->name,
977
(intmax_t) (proc->pid),
843
978
WTERMSIG(proc->status));
844
979
} else if(WCOREDUMP(proc->status)){
845
fprintf(stderr, "Plugin %d dumped core\n",
846
(unsigned int) (proc->pid));
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
981
" core\n", proc->name, (intmax_t) (proc->pid));
847
982
}
848
983
}
984
849
985
/* Remove the plugin */
850
986
FD_CLR(proc->fd, &rfds_all);
987
851
988
/* Block signal while modifying process_list */
852
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
990
if(ret < 0){
855
992
exitstatus = EXIT_FAILURE;
856
993
goto fallback;
857
994
}
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
}
995
996
plugin *next_plugin = proc->next;
997
free_plugin(proc);
998
proc = next_plugin;
999
871
1000
/* We are done modifying process list, so unblock signal */
872
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
873
NULL);
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
874
1003
if(ret < 0){
875
1004
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;
1005
exitstatus = EXIT_FAILURE;
1006
goto fallback;
1007
}
1008
1009
if(plugin_list == NULL){
1010
break;
1011
}
1012
1013
continue;
883
1014
}
1015
884
1016
/* This process exited nicely, so print its buffer */
885
1017
886
1018
bool bret = print_out_password(proc->buffer,
887
1019
proc->buffer_length);
888
1020
if(not bret){
891
1023
}
892
1024
goto fallback;
893
1025
}
1026
894
1027
/* This process has not completed. Does it have any output? */
895
1028
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
896
1029
/* This process had nothing to say at this time */
1030
proc = proc->next;
897
1031
continue;
898
1032
}
899
1033
/* Before reading, make the process' data buffer large enough */
900
1034
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
901
1035
proc->buffer = realloc(proc->buffer, proc->buffer_size
902
1036
+ (size_t) BUFFER_SIZE);
903
if (proc->buffer == NULL){
1037
if(proc->buffer == NULL){
904
1038
perror("malloc");
905
1039
exitstatus = EXIT_FAILURE;
906
1040
goto fallback;
908
1042
proc->buffer_size += BUFFER_SIZE;
909
1043
}
910
1044
/* Read from the process */
911
ret = read(proc->fd, proc->buffer + proc->buffer_length,
912
BUFFER_SIZE);
913
if(ret < 0){
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1047
if(sret < 0){
914
1048
/* Read error from this process; ignore the error */
1049
proc = proc->next;
915
1050
continue;
916
1051
}
917
if(ret == 0){
1052
if(sret == 0){
918
1053
/* got EOF */
919
1054
proc->eof = true;
920
1055
} else {
921
proc->buffer_length += (size_t) ret;
1056
proc->buffer_length += (size_t) sret;
922
1057
}
923
1058
}
924
1059
}
925
926
1060
1061
927
1062
fallback:
928
1063
929
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
930
1065
/* Fallback if all plugins failed, none are found or an error
931
1066
occured */
932
1067
bool bret;
933
1068
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
934
1069
char *passwordbuffer = getpass("Password: ");
935
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1070
size_t len = strlen(passwordbuffer);
1071
/* Strip trailing newline */
1072
if(len > 0 and passwordbuffer[len-1] == '\n'){
1073
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1074
len--;
1075
}
1076
bret = print_out_password(passwordbuffer, len);
936
1077
if(not bret){
937
1078
perror("print_out_password");
938
1079
exitstatus = EXIT_FAILURE;
945
1086
perror("sigaction");
946
1087
exitstatus = EXIT_FAILURE;
947
1088
}
948
1089
949
1090
if(custom_argv != NULL){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
1091
for(char **arg = custom_argv+1; *arg != NULL; arg++){
951
1092
free(*arg);
952
1093
}
953
1094
free(custom_argv);
954
1095
}
955
free_plugin_list(plugin_list);
956
1096
957
1097
if(dir != NULL){
958
1098
closedir(dir);
959
1099
}
960
1100
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");
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
}
969
1110
}
970
free(process_list->buffer);
971
free(process_list);
972
1111
}
973
1112
974
1113
/* Wait for any remaining child processes to terminate */
979
1118
perror("wait");
980
1119
}
981
1120
1121
free_plugin_list();
1122
1123
free(plugindir);
1124
free(argfile);
1125
982
1126
return exitstatus;
983
1127
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0