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- Committer: Teddy Hogeborn
- Date: 2009-02-09 19:26:19 UTC
- mto: (24.1.136 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: teddy@fukt.bsnet.se-20090209192619-7rse82x9pypq4ihk
* plugin-runner.c: Comment change.
* plugins.d/mandos-client.c: Comment changes.
(quit_now): New global flag.
(handle_sigterm): Only call avahi_simple_poll_quit once.
(main): Also handle SIGINT and SIGHUP.
* plugins.d/mandos-client.c: Comment changes.
(quit_now): New global flag.
(handle_sigterm): Only call avahi_simple_poll_quit once.
(main): Also handle SIGINT and SIGHUP.
- 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, SCNdMAX, PRIdMAX, */
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 parsing */
258
argv[1] = NULL;
259
}
260
*argc += 1;
261
argv = realloc(argv, sizeof(char *)
262
* ((unsigned int) *argc + 1));
263
if(argv == NULL){
264
return NULL;
265
}
266
argv[*argc-1] = arg;
267
argv[*argc] = NULL;
268
return argv;
296
}
297
298
free(plugin_node);
269
299
}
270
300
271
static void free_plugin_list(plugin *plugin_list){
272
for(plugin *next; plugin_list != NULL; plugin_list = next){
273
next = plugin_list->next;
274
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_list->argv);
278
for(char **env = plugin_list->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_list->environ);
282
free(plugin_list);
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
283
304
}
284
305
}
285
306
286
307
int main(int argc, char *argv[]){
287
const char *plugindir = "/lib/mandos/plugins.d";
288
const char *argfile = ARGFILE;
308
char *plugindir = NULL;
309
char *argfile = NULL;
289
310
FILE *conffp;
290
311
size_t d_name_len;
291
312
DIR *dir = NULL;
292
313
struct dirent *dirst;
293
314
struct stat st;
294
315
fd_set rfds_all;
295
int ret, maxfd = 0;
316
int ret, numchars, maxfd = 0;
317
ssize_t sret;
318
intmax_t tmpmax;
296
319
uid_t uid = 65534;
297
320
gid_t gid = 65534;
298
321
bool debug = false;
323
346
{ .name = "global-options", .key = 'g',
324
347
.arg = "OPTION[,OPTION[,...]]",
325
348
.doc = "Options passed to all plugins" },
326
{ .name = "global-envs", .key = 'e',
349
{ .name = "global-env", .key = 'G',
327
350
.arg = "VAR=value",
328
351
.doc = "Environment variable passed to all plugins" },
329
352
{ .name = "options-for", .key = 'o',
330
353
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
331
354
.doc = "Options passed only to specified plugin" },
332
{ .name = "envs-for", .key = 'f',
355
{ .name = "env-for", .key = 'E',
333
356
.arg = "PLUGIN:ENV=value",
334
357
.doc = "Environment variable passed to specified plugin" },
335
358
{ .name = "disable", .key = 'd',
336
359
.arg = "PLUGIN",
337
360
.doc = "Disable a specific plugin", .group = 1 },
361
{ .name = "enable", .key = 'e',
362
.arg = "PLUGIN",
363
.doc = "Enable a specific plugin", .group = 1 },
338
364
{ .name = "plugin-dir", .key = 128,
339
365
.arg = "DIRECTORY",
340
366
.doc = "Specify a different plugin directory", .group = 2 },
341
{ .name = "userid", .key = 129,
342
.arg = "ID", .flags = 0,
343
.doc = "User ID the plugins will run as", .group = 2 },
344
{ .name = "groupid", .key = 130,
345
.arg = "ID", .flags = 0,
346
.doc = "Group ID the plugins will run as", .group = 2 },
347
{ .name = "debug", .key = 131,
348
.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 },
349
378
{ .name = NULL }
350
379
};
351
380
352
error_t parse_opt (int key, char *arg, struct argp_state *state) {
353
/* Get the INPUT argument from `argp_parse', which we know is a
354
pointer to our plugin list pointer. */
355
plugin **plugins = state->input;
356
switch (key) {
357
case 'g':
358
if (arg != NULL){
359
char *p;
360
while((p = strsep(&arg, ",")) != NULL){
361
if(p[0] == '\0'){
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
383
switch(key){
384
case 'g': /* --global-options */
385
if(arg != NULL){
386
char *plugin_option;
387
while((plugin_option = strsep(&arg, ",")) != NULL){
388
if(plugin_option[0] == '\0'){
362
389
continue;
363
390
}
364
if(not add_argument(getplugin(NULL, plugins), p)){
391
if(not add_argument(getplugin(NULL), plugin_option)){
365
392
perror("add_argument");
366
393
return ARGP_ERR_UNKNOWN;
367
394
}
368
395
}
369
396
}
370
397
break;
371
case 'e':
398
case 'G': /* --global-env */
372
399
if(arg == NULL){
373
400
break;
374
401
}
375
{
376
char *envdef = strdup(arg);
377
if(envdef == NULL){
378
break;
379
}
380
if(not add_environment(getplugin(NULL, plugins), envdef)){
381
perror("add_environment");
382
}
402
if(not add_environment(getplugin(NULL), arg, true)){
403
perror("add_environment");
383
404
}
384
405
break;
385
case 'o':
386
if (arg != NULL){
387
char *p_name = strsep(&arg, ":");
388
if(p_name[0] == '\0'){
389
break;
390
}
391
char *opt = strsep(&arg, ":");
392
if(opt[0] == '\0'){
393
break;
394
}
395
if(opt != NULL){
396
char *p;
397
while((p = strsep(&opt, ",")) != NULL){
398
if(p[0] == '\0'){
399
continue;
400
}
401
if(not add_argument(getplugin(p_name, plugins), p)){
402
perror("add_argument");
403
return ARGP_ERR_UNKNOWN;
404
}
406
case 'o': /* --options-for */
407
if(arg != NULL){
408
char *plugin_name = strsep(&arg, ":");
409
if(plugin_name[0] == '\0'){
410
break;
411
}
412
char *plugin_option;
413
while((plugin_option = strsep(&arg, ",")) != NULL){
414
if(not add_argument(getplugin(plugin_name), plugin_option)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
405
417
}
406
418
}
407
419
}
408
420
break;
409
case 'f':
421
case 'E': /* --env-for */
410
422
if(arg == NULL){
411
423
break;
412
424
}
415
427
if(envdef == NULL){
416
428
break;
417
429
}
418
char *p_name = strndup(arg, (size_t) (envdef-arg));
419
if(p_name == NULL){
420
break;
421
}
422
envdef++;
423
if(not add_environment(getplugin(p_name, plugins), envdef)){
430
*envdef = '\0';
431
if(not add_environment(getplugin(arg), envdef+1, true)){
424
432
perror("add_environment");
425
433
}
426
434
}
427
435
break;
428
case 'd':
429
if (arg != NULL){
430
plugin *p = getplugin(arg, plugins);
436
case 'd': /* --disable */
437
if(arg != NULL){
438
plugin *p = getplugin(arg);
431
439
if(p == NULL){
432
440
return ARGP_ERR_UNKNOWN;
433
441
}
434
442
p->disabled = true;
435
443
}
436
444
break;
437
case 128:
438
plugindir = arg;
439
break;
440
case 129:
441
uid = (uid_t)strtol(arg, NULL, 10);
442
break;
443
case 130:
444
gid = (gid_t)strtol(arg, NULL, 10);
445
break;
446
case 131:
445
case 'e': /* --enable */
446
if(arg != NULL){
447
plugin *p = getplugin(arg);
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
450
}
451
p->disabled = false;
452
}
453
break;
454
case 128: /* --plugin-dir */
455
free(plugindir);
456
plugindir = strdup(arg);
457
if(plugindir == NULL){
458
perror("strdup");
459
}
460
break;
461
case 129: /* --config-file */
462
/* This is already done by parse_opt_config_file() */
463
break;
464
case 130: /* --userid */
465
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
466
if(ret < 1 or tmpmax != (uid_t)tmpmax
467
or arg[numchars] != '\0'){
468
fprintf(stderr, "Bad user ID number: \"%s\", using %"
469
PRIdMAX "\n", arg, (intmax_t)uid);
470
} else {
471
uid = (uid_t)tmpmax;
472
}
473
break;
474
case 131: /* --groupid */
475
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
476
if(ret < 1 or tmpmax != (gid_t)tmpmax
477
or arg[numchars] != '\0'){
478
fprintf(stderr, "Bad group ID number: \"%s\", using %"
479
PRIdMAX "\n", arg, (intmax_t)gid);
480
} else {
481
gid = (gid_t)tmpmax;
482
}
483
break;
484
case 132: /* --debug */
447
485
debug = true;
448
486
break;
449
case ARGP_KEY_ARG:
450
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
451
break;
452
case ARGP_KEY_END:
453
break;
454
default:
455
return ARGP_ERR_UNKNOWN;
456
}
457
return 0;
458
}
459
460
plugin *plugin_list = NULL;
461
462
struct argp argp = { .options = options, .parser = parse_opt,
463
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
487
/*
488
* When adding more options before this line, remember to also add a
489
* "case" to the "parse_opt_config_file" function below.
490
*/
491
case ARGP_KEY_ARG:
492
/* Cryptsetup always passes an argument, which is an empty
493
string if "none" was specified in /etc/crypttab. So if
494
argument was empty, we ignore it silently. */
495
if(arg[0] != '\0'){
496
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
497
}
498
break;
499
case ARGP_KEY_END:
500
break;
501
default:
502
return ARGP_ERR_UNKNOWN;
503
}
504
return 0;
505
}
506
507
/* This option parser is the same as parse_opt() above, except it
508
ignores everything but the --config-file option. */
509
error_t parse_opt_config_file(int key, char *arg,
510
__attribute__((unused))
511
struct argp_state *state){
512
switch(key){
513
case 'g': /* --global-options */
514
case 'G': /* --global-env */
515
case 'o': /* --options-for */
516
case 'E': /* --env-for */
517
case 'd': /* --disable */
518
case 'e': /* --enable */
519
case 128: /* --plugin-dir */
520
break;
521
case 129: /* --config-file */
522
free(argfile);
523
argfile = strdup(arg);
524
if(argfile == NULL){
525
perror("strdup");
526
}
527
break;
528
case 130: /* --userid */
529
case 131: /* --groupid */
530
case 132: /* --debug */
531
case ARGP_KEY_ARG:
532
case ARGP_KEY_END:
533
break;
534
default:
535
return ARGP_ERR_UNKNOWN;
536
}
537
return 0;
538
}
539
540
struct argp argp = { .options = options,
541
.parser = parse_opt_config_file,
542
.args_doc = "",
464
543
.doc = "Mandos plugin runner -- Run plugins" };
465
544
466
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
467
if (ret == ARGP_ERR_UNKNOWN){
545
/* Parse using parse_opt_config_file() in order to get the custom
546
config file location, if any. */
547
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
548
if(ret == ARGP_ERR_UNKNOWN){
468
549
fprintf(stderr, "Unknown error while parsing arguments\n");
469
550
exitstatus = EXIT_FAILURE;
470
551
goto fallback;
471
552
}
472
473
conffp = fopen(argfile, "r");
553
554
/* Reset to the normal argument parser */
555
argp.parser = parse_opt;
556
557
/* Open the configfile if available */
558
if(argfile == NULL){
559
conffp = fopen(AFILE, "r");
560
} else {
561
conffp = fopen(argfile, "r");
562
}
474
563
if(conffp != NULL){
475
564
char *org_line = NULL;
476
565
char *p, *arg, *new_arg, *line;
477
566
size_t size = 0;
478
ssize_t sret;
479
567
const char whitespace_delims[] = " \r\t\f\v\n";
480
568
const char comment_delim[] = "#";
481
569
570
custom_argc = 1;
571
custom_argv = malloc(sizeof(char*) * 2);
572
if(custom_argv == NULL){
573
perror("malloc");
574
exitstatus = EXIT_FAILURE;
575
goto fallback;
576
}
577
custom_argv[0] = argv[0];
578
custom_argv[1] = NULL;
579
580
/* for each line in the config file, strip whitespace and ignore
581
commented text */
482
582
while(true){
483
583
sret = getline(&org_line, &size, conffp);
484
584
if(sret == -1){
492
592
continue;
493
593
}
494
594
new_arg = strdup(p);
495
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
496
if (custom_argv == NULL){
497
perror("add_to_argv");
498
exitstatus = EXIT_FAILURE;
499
goto fallback;
500
}
595
if(new_arg == NULL){
596
perror("strdup");
597
exitstatus = EXIT_FAILURE;
598
free(org_line);
599
goto fallback;
600
}
601
602
custom_argc += 1;
603
custom_argv = realloc(custom_argv, sizeof(char *)
604
* ((unsigned int) custom_argc + 1));
605
if(custom_argv == NULL){
606
perror("realloc");
607
exitstatus = EXIT_FAILURE;
608
free(org_line);
609
goto fallback;
610
}
611
custom_argv[custom_argc-1] = new_arg;
612
custom_argv[custom_argc] = NULL;
501
613
}
502
614
}
503
615
free(org_line);
504
} else{
616
} else {
505
617
/* Check for harmful errors and go to fallback. Other errors might
506
618
not affect opening plugins */
507
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
619
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
508
620
perror("fopen");
509
621
exitstatus = EXIT_FAILURE;
510
622
goto fallback;
511
623
}
512
624
}
513
625
/* If there was any arguments from configuration file,
626
pass them to parser as command arguments */
514
627
if(custom_argv != NULL){
515
custom_argv[0] = argv[0];
516
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
517
if (ret == ARGP_ERR_UNKNOWN){
628
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
629
0, NULL);
630
if(ret == ARGP_ERR_UNKNOWN){
518
631
fprintf(stderr, "Unknown error while parsing arguments\n");
519
632
exitstatus = EXIT_FAILURE;
520
633
goto fallback;
521
634
}
522
635
}
523
636
637
/* Parse actual command line arguments, to let them override the
638
config file */
639
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
640
if(ret == ARGP_ERR_UNKNOWN){
641
fprintf(stderr, "Unknown error while parsing arguments\n");
642
exitstatus = EXIT_FAILURE;
643
goto fallback;
644
}
645
524
646
if(debug){
525
647
for(plugin *p = plugin_list; p != NULL; p=p->next){
526
648
fprintf(stderr, "Plugin: %s has %d arguments\n",
528
650
for(char **a = p->argv; *a != NULL; a++){
529
651
fprintf(stderr, "\tArg: %s\n", *a);
530
652
}
531
fprintf(stderr, "...and %u environment variables\n", p->envc);
653
fprintf(stderr, "...and %d environment variables\n", p->envc);
532
654
for(char **a = p->environ; *a != NULL; a++){
533
655
fprintf(stderr, "\t%s\n", *a);
534
656
}
535
657
}
536
658
}
537
659
660
/* Strip permissions down to nobody */
661
setgid(gid);
662
if(ret == -1){
663
perror("setgid");
664
}
538
665
ret = setuid(uid);
539
if (ret == -1){
666
if(ret == -1){
540
667
perror("setuid");
541
668
}
542
669
543
setgid(gid);
544
if (ret == -1){
545
perror("setgid");
670
if(plugindir == NULL){
671
dir = opendir(PDIR);
672
} else {
673
dir = opendir(plugindir);
546
674
}
547
675
548
dir = opendir(plugindir);
549
676
if(dir == NULL){
550
677
perror("Could not open plugin dir");
551
678
exitstatus = EXIT_FAILURE;
567
694
568
695
FD_ZERO(&rfds_all);
569
696
697
/* Read and execute any executable in the plugin directory*/
570
698
while(true){
571
699
dirst = readdir(dir);
572
700
573
// All directory entries have been processed
701
/* All directory entries have been processed */
574
702
if(dirst == NULL){
575
if (errno == EBADF){
703
if(errno == EBADF){
576
704
perror("readdir");
577
705
exitstatus = EXIT_FAILURE;
578
706
goto fallback;
582
710
583
711
d_name_len = strlen(dirst->d_name);
584
712
585
// Ignore dotfiles, backup files and other junk
713
/* Ignore dotfiles, backup files and other junk */
586
714
{
587
715
bool bad_name = false;
588
716
590
718
591
719
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
592
720
".dpkg-old",
721
".dpkg-bak",
593
722
".dpkg-divert", NULL };
594
723
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
595
724
size_t pre_len = strlen(*pre);
603
732
break;
604
733
}
605
734
}
606
607
735
if(bad_name){
608
736
continue;
609
737
}
610
611
738
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
612
739
size_t suf_len = strlen(*suf);
613
740
if((d_name_len >= suf_len)
628
755
}
629
756
630
757
char *filename;
631
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
758
if(plugindir == NULL){
759
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
760
} else {
761
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
762
}
632
763
if(ret < 0){
633
764
perror("asprintf");
634
765
continue;
635
766
}
636
767
637
768
ret = stat(filename, &st);
638
if (ret == -1){
769
if(ret == -1){
639
770
perror("stat");
640
771
free(filename);
641
772
continue;
642
773
}
643
644
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
774
775
/* Ignore non-executable files */
776
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
645
777
if(debug){
646
778
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
647
779
" with bad type or mode\n", filename);
649
781
free(filename);
650
782
continue;
651
783
}
652
plugin *p = getplugin(dirst->d_name, &plugin_list);
784
785
plugin *p = getplugin(dirst->d_name);
653
786
if(p == NULL){
654
787
perror("getplugin");
655
788
free(filename);
665
798
}
666
799
{
667
800
/* Add global arguments to argument list for this plugin */
668
plugin *g = getplugin(NULL, &plugin_list);
801
plugin *g = getplugin(NULL);
669
802
if(g != NULL){
670
803
for(char **a = g->argv + 1; *a != NULL; a++){
671
804
if(not add_argument(p, *a)){
674
807
}
675
808
/* Add global environment variables */
676
809
for(char **e = g->environ; *e != NULL; e++){
677
if(not add_environment(p, *e)){
810
if(not add_environment(p, *e, false)){
678
811
perror("add_environment");
679
812
}
680
813
}
685
818
process, too. */
686
819
if(p->environ[0] != NULL){
687
820
for(char **e = environ; *e != NULL; e++){
688
char *copy = strdup(*e);
689
if(copy == NULL){
690
perror("strdup");
691
continue;
692
}
693
if(not add_environment(p, copy)){
821
if(not add_environment(p, *e, false)){
694
822
perror("add_environment");
695
823
}
696
824
}
698
826
699
827
int pipefd[2];
700
828
ret = pipe(pipefd);
701
if (ret == -1){
829
if(ret == -1){
702
830
perror("pipe");
703
831
exitstatus = EXIT_FAILURE;
704
832
goto fallback;
705
833
}
834
/* Ask OS to automatic close the pipe on exec */
706
835
ret = set_cloexec_flag(pipefd[0]);
707
836
if(ret < 0){
708
837
perror("set_cloexec_flag");
716
845
goto fallback;
717
846
}
718
847
/* Block SIGCHLD until process is safely in process list */
719
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
848
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
720
849
if(ret < 0){
721
850
perror("sigprocmask");
722
851
exitstatus = EXIT_FAILURE;
723
852
goto fallback;
724
853
}
725
// Starting a new process to be watched
854
/* Starting a new process to be watched */
726
855
pid_t pid = fork();
727
856
if(pid == -1){
728
857
perror("fork");
736
865
perror("sigaction");
737
866
_exit(EXIT_FAILURE);
738
867
}
739
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
868
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
740
869
if(ret < 0){
741
870
perror("sigprocmask");
742
871
_exit(EXIT_FAILURE);
743
872
}
744
873
745
874
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
746
875
if(ret == -1){
747
876
perror("dup2");
766
895
}
767
896
/* no return */
768
897
}
769
/* parent process */
898
/* Parent process */
899
close(pipefd[1]); /* Close unused write end of pipe */
770
900
free(filename);
771
close(pipefd[1]); /* close unused write end of pipe */
772
process *new_process = malloc(sizeof(process));
773
if (new_process == NULL){
774
perror("malloc");
775
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
901
plugin *new_plugin = getplugin(dirst->d_name);
902
if(new_plugin == NULL){
903
perror("getplugin");
904
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
776
905
if(ret < 0){
777
perror("sigprocmask");
906
perror("sigprocmask");
778
907
}
779
908
exitstatus = EXIT_FAILURE;
780
909
goto fallback;
781
910
}
782
911
783
*new_process = (struct process){ .pid = pid,
784
.fd = pipefd[0],
785
.next = process_list };
786
// List handling
787
process_list = new_process;
912
new_plugin->pid = pid;
913
new_plugin->fd = pipefd[0];
914
788
915
/* Unblock SIGCHLD so signal handler can be run if this process
789
916
has already completed */
790
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
791
918
if(ret < 0){
792
919
perror("sigprocmask");
793
920
exitstatus = EXIT_FAILURE;
794
921
goto fallback;
795
922
}
796
923
797
FD_SET(new_process->fd, &rfds_all);
924
FD_SET(new_plugin->fd, &rfds_all);
798
925
799
if (maxfd < new_process->fd){
800
maxfd = new_process->fd;
926
if(maxfd < new_plugin->fd){
927
maxfd = new_plugin->fd;
801
928
}
802
803
929
}
804
930
805
free_plugin_list(plugin_list);
806
plugin_list = NULL;
807
808
931
closedir(dir);
809
932
dir = NULL;
810
811
if (process_list == NULL){
812
fprintf(stderr, "No plugin processes started. Incorrect plugin"
813
" directory?\n");
814
process_list = NULL;
933
free_plugin(getplugin(NULL));
934
935
for(plugin *p = plugin_list; p != NULL; p = p->next){
936
if(p->pid != 0){
937
break;
938
}
939
if(p->next == NULL){
940
fprintf(stderr, "No plugin processes started. Incorrect plugin"
941
" directory?\n");
942
free_plugin_list();
943
}
815
944
}
816
while(process_list){
945
946
/* Main loop while running plugins exist */
947
while(plugin_list){
817
948
fd_set rfds = rfds_all;
818
949
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
819
if (select_ret == -1){
950
if(select_ret == -1){
820
951
perror("select");
821
952
exitstatus = EXIT_FAILURE;
822
953
goto fallback;
823
954
}
824
955
/* OK, now either a process completed, or something can be read
825
956
from one of them */
826
for(process *proc = process_list; proc ; proc = proc->next){
957
for(plugin *proc = plugin_list; proc != NULL;){
827
958
/* Is this process completely done? */
828
if(proc->eof and proc->completed){
959
if(proc->completed and proc->eof){
829
960
/* Only accept the plugin output if it exited cleanly */
830
961
if(not WIFEXITED(proc->status)
831
962
or WEXITSTATUS(proc->status) != 0){
832
963
/* Bad exit by plugin */
964
833
965
if(debug){
834
966
if(WIFEXITED(proc->status)){
835
fprintf(stderr, "Plugin %u exited with status %d\n",
836
(unsigned int) (proc->pid),
967
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
968
" status %d\n", proc->name,
969
(intmax_t) (proc->pid),
837
970
WEXITSTATUS(proc->status));
838
} else if(WIFSIGNALED(proc->status)) {
839
fprintf(stderr, "Plugin %u killed by signal %d\n",
840
(unsigned int) (proc->pid),
971
} else if(WIFSIGNALED(proc->status)){
972
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
973
" signal %d\n", proc->name,
974
(intmax_t) (proc->pid),
841
975
WTERMSIG(proc->status));
842
976
} else if(WCOREDUMP(proc->status)){
843
fprintf(stderr, "Plugin %d dumped core\n",
844
(unsigned int) (proc->pid));
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
978
" core\n", proc->name, (intmax_t) (proc->pid));
845
979
}
846
980
}
981
847
982
/* Remove the plugin */
848
983
FD_CLR(proc->fd, &rfds_all);
984
849
985
/* Block signal while modifying process_list */
850
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
851
987
if(ret < 0){
853
989
exitstatus = EXIT_FAILURE;
854
990
goto fallback;
855
991
}
856
/* Delete this process entry from the list */
857
if(process_list == proc){
858
/* First one - simple */
859
process_list = proc->next;
860
} else {
861
/* Second one or later */
862
for(process *p = process_list; p != NULL; p = p->next){
863
if(p->next == proc){
864
p->next = proc->next;
865
break;
866
}
867
}
868
}
992
993
plugin *next_plugin = proc->next;
994
free_plugin(proc);
995
proc = next_plugin;
996
869
997
/* We are done modifying process list, so unblock signal */
870
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
871
NULL);
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
872
1000
if(ret < 0){
873
1001
perror("sigprocmask");
874
}
875
free(proc->buffer);
876
free(proc);
877
/* We deleted this process from the list, so we can't go
878
proc->next. Therefore, start over from the beginning of
879
the process list */
880
break;
1002
exitstatus = EXIT_FAILURE;
1003
goto fallback;
1004
}
1005
1006
if(plugin_list == NULL){
1007
break;
1008
}
1009
1010
continue;
881
1011
}
1012
882
1013
/* This process exited nicely, so print its buffer */
883
1014
884
1015
bool bret = print_out_password(proc->buffer,
885
1016
proc->buffer_length);
886
1017
if(not bret){
889
1020
}
890
1021
goto fallback;
891
1022
}
1023
892
1024
/* This process has not completed. Does it have any output? */
893
1025
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
894
1026
/* This process had nothing to say at this time */
1027
proc = proc->next;
895
1028
continue;
896
1029
}
897
1030
/* Before reading, make the process' data buffer large enough */
898
1031
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
899
1032
proc->buffer = realloc(proc->buffer, proc->buffer_size
900
1033
+ (size_t) BUFFER_SIZE);
901
if (proc->buffer == NULL){
1034
if(proc->buffer == NULL){
902
1035
perror("malloc");
903
1036
exitstatus = EXIT_FAILURE;
904
1037
goto fallback;
906
1039
proc->buffer_size += BUFFER_SIZE;
907
1040
}
908
1041
/* Read from the process */
909
ret = read(proc->fd, proc->buffer + proc->buffer_length,
910
BUFFER_SIZE);
911
if(ret < 0){
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1044
if(sret < 0){
912
1045
/* Read error from this process; ignore the error */
1046
proc = proc->next;
913
1047
continue;
914
1048
}
915
if(ret == 0){
1049
if(sret == 0){
916
1050
/* got EOF */
917
1051
proc->eof = true;
918
1052
} else {
919
proc->buffer_length += (size_t) ret;
1053
proc->buffer_length += (size_t) sret;
920
1054
}
921
1055
}
922
1056
}
924
1058
925
1059
fallback:
926
1060
927
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
928
1062
/* Fallback if all plugins failed, none are found or an error
929
1063
occured */
930
1064
bool bret;
931
1065
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
932
1066
char *passwordbuffer = getpass("Password: ");
933
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1067
size_t len = strlen(passwordbuffer);
1068
/* Strip trailing newline */
1069
if(len > 0 and passwordbuffer[len-1] == '\n'){
1070
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1071
len--;
1072
}
1073
bret = print_out_password(passwordbuffer, len);
934
1074
if(not bret){
935
1075
perror("print_out_password");
936
1076
exitstatus = EXIT_FAILURE;
943
1083
perror("sigaction");
944
1084
exitstatus = EXIT_FAILURE;
945
1085
}
946
1086
947
1087
if(custom_argv != NULL){
948
for(char **arg = custom_argv; *arg != NULL; arg++){
1088
for(char **arg = custom_argv+1; *arg != NULL; arg++){
949
1089
free(*arg);
950
1090
}
951
1091
free(custom_argv);
952
1092
}
953
free_plugin_list(plugin_list);
954
1093
955
1094
if(dir != NULL){
956
1095
closedir(dir);
957
1096
}
958
1097
959
/* Free the process list and kill the processes */
960
for(process *next; process_list != NULL; process_list = next){
961
next = process_list->next;
962
close(process_list->fd);
963
ret = kill(process_list->pid, SIGTERM);
964
if(ret == -1 and errno != ESRCH){
965
/* set-uid proccesses migth not get closed */
966
perror("kill");
1098
/* Kill the processes */
1099
for(plugin *p = plugin_list; p != NULL; p = p->next){
1100
if(p->pid != 0){
1101
close(p->fd);
1102
ret = kill(p->pid, SIGTERM);
1103
if(ret == -1 and errno != ESRCH){
1104
/* Set-uid proccesses might not get closed */
1105
perror("kill");
1106
}
967
1107
}
968
free(process_list->buffer);
969
free(process_list);
970
1108
}
971
1109
972
1110
/* Wait for any remaining child processes to terminate */
977
1115
perror("wait");
978
1116
}
979
1117
1118
free_plugin_list();
1119
1120
free(plugindir);
1121
free(argfile);
1122
980
1123
return exitstatus;
981
1124
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0