To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 24.1.65
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.65
- Committer: Björn Påhlsson
- Date: 2008-08-24 23:13:57 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 102.
- Revision ID: belorn@braxen-20080824231357-e304pw7ls2dnnvw5
* plugin-runner.c (handle_sigchld): Loop until all exited children
have been wait()ed for.
have been wait()ed for.
- 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,
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
40
WEXITSTATUS() */
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
53
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
53
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
61
58
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
64
60
#include <signal.h> /* struct sigaction, sigemptyset(),
65
61
sigaddset(), sigaction(),
66
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
63
SIG_UNBLOCK, kill() */
69
64
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
65
72
66
#define BUFFER_SIZE 256
73
74
#define PDIR "/lib/mandos/plugins.d"
75
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
76
77
const char *argp_program_version = "plugin-runner " VERSION;
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
78
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
79
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
80
86
typedef struct plugin{
81
87
char *name; /* can be NULL or any plugin name */
82
88
char **argv;
84
90
char **environ;
85
91
int envc;
86
92
bool disabled;
87
88
/* Variables used for running processes*/
89
pid_t pid;
90
int fd;
91
char *buffer;
92
size_t buffer_size;
93
size_t buffer_length;
94
bool eof;
95
volatile sig_atomic_t completed;
96
int status;
97
93
struct plugin *next;
98
94
} plugin;
99
95
100
static plugin *plugin_list = NULL;
101
102
/* Gets an existing plugin based on name,
103
or if none is found, creates a new one */
104
static plugin *getplugin(char *name){
105
/* Check for exiting plugin with that name */
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
107
if((p->name == name)
108
or (p->name and name and (strcmp(p->name, name) == 0))){
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
if ((p->name == name)
99
or (p->name and name and (strcmp(p->name, name) == 0))){
109
100
return p;
110
101
}
111
102
}
112
103
/* Create a new plugin */
113
104
plugin *new_plugin = malloc(sizeof(plugin));
114
if(new_plugin == NULL){
105
if (new_plugin == NULL){
115
106
return NULL;
116
107
}
117
108
char *copy_name = NULL;
118
109
if(name != NULL){
119
110
copy_name = strdup(name);
120
111
if(copy_name == NULL){
121
free(new_plugin);
122
112
return NULL;
123
113
}
124
114
}
125
115
126
*new_plugin = (plugin){ .name = copy_name,
127
.argc = 1,
128
.disabled = false,
129
.next = plugin_list };
116
*new_plugin = (plugin) { .name = copy_name,
117
.argc = 1,
118
.envc = 0,
119
.disabled = false,
120
.next = *plugin_list };
130
121
131
122
new_plugin->argv = malloc(sizeof(char *) * 2);
132
if(new_plugin->argv == NULL){
123
if (new_plugin->argv == NULL){
133
124
free(copy_name);
134
125
free(new_plugin);
135
126
return NULL;
136
127
}
137
128
new_plugin->argv[0] = copy_name;
138
129
new_plugin->argv[1] = NULL;
139
130
140
131
new_plugin->environ = malloc(sizeof(char *));
141
132
if(new_plugin->environ == NULL){
142
133
free(copy_name);
145
136
return NULL;
146
137
}
147
138
new_plugin->environ[0] = NULL;
148
149
139
/* Append the new plugin to the list */
150
plugin_list = new_plugin;
140
*plugin_list = new_plugin;
151
141
return new_plugin;
152
142
}
153
143
183
173
}
184
174
185
175
/* Add to a plugin's environment */
186
static bool add_environment(plugin *p, const char *def, bool replace){
176
static bool add_environment(plugin *p, const char *def){
187
177
if(p == NULL){
188
178
return false;
189
179
}
190
/* namelen = length of name of environment variable */
191
size_t namelen = (size_t)(strchrnul(def, '=') - def);
192
/* Search for this environment variable */
193
for(char **e = p->environ; *e != NULL; e++){
194
if(strncmp(*e, def, namelen + 1) == 0){
195
/* It already exists */
196
if(replace){
197
char *new = realloc(*e, strlen(def) + 1);
198
if(new == NULL){
199
return false;
200
}
201
*e = new;
202
strcpy(*e, def);
203
}
204
return true;
205
}
206
}
207
180
return add_to_char_array(def, &(p->environ), &(p->envc));
208
181
}
209
182
183
210
184
/*
211
185
* Based on the example in the GNU LibC manual chapter 13.13 "File
212
186
* Descriptor Flags".
213
187
* *Note File Descriptor Flags:(libc)Descriptor Flags.
214
188
*/
215
static int set_cloexec_flag(int fd){
189
static int set_cloexec_flag(int fd)
190
{
216
191
int ret = fcntl(fd, F_GETFD, 0);
217
192
/* If reading the flags failed, return error indication now. */
218
193
if(ret < 0){
222
197
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
223
198
}
224
199
200
process *process_list = NULL;
225
201
226
/* Mark processes as completed when they exit, and save their exit
202
/* Mark processes as completed when it exits, and save its exit
227
203
status. */
228
static void handle_sigchld(__attribute__((unused)) int sig){
229
int old_errno = errno;
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
230
206
while(true){
231
plugin *proc = plugin_list;
232
207
int status;
233
208
pid_t pid = waitpid(-1, &status, WNOHANG);
234
209
if(pid == 0){
235
/* Only still running child processes */
236
210
break;
237
211
}
238
212
if(pid == -1){
239
if(errno == ECHILD){
240
/* No child processes */
241
break;
213
if (errno != ECHILD){
214
perror("waitpid");
242
215
}
243
perror("waitpid");
216
return;
244
217
}
245
246
/* A child exited, find it in process_list */
218
247
219
while(proc != NULL and proc->pid != pid){
248
220
proc = proc->next;
249
221
}
252
224
continue;
253
225
}
254
226
proc->status = status;
255
proc->completed = 1;
227
proc->completed = true;
256
228
}
257
errno = old_errno;
258
229
}
259
230
260
/* Prints out a password to stdout */
261
static bool print_out_password(const char *buffer, size_t length){
231
bool print_out_password(const char *buffer, size_t length){
262
232
ssize_t ret;
233
if(length>0 and buffer[length-1] == '\n'){
234
length--;
235
}
263
236
for(size_t written = 0; written < length; written += (size_t)ret){
264
237
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
265
238
length - written));
270
243
return true;
271
244
}
272
245
273
/* Removes and free a plugin from the plugin list */
274
static void free_plugin(plugin *plugin_node){
275
276
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
277
free(*arg);
278
}
279
free(plugin_node->argv);
280
for(char **env = plugin_node->environ; *env != NULL; env++){
281
free(*env);
282
}
283
free(plugin_node->environ);
284
free(plugin_node->buffer);
285
286
/* Removes the plugin from the singly-linked list */
287
if(plugin_node == plugin_list){
288
/* First one - simple */
289
plugin_list = plugin_list->next;
290
} else {
291
/* Second one or later */
292
for(plugin *p = plugin_list; p != NULL; p = p->next){
293
if(p->next == plugin_node){
294
p->next = plugin_node->next;
295
break;
296
}
246
char **add_to_argv(char **argv, int *argc, char *arg){
247
if (argv == NULL){
248
*argc = 1;
249
argv = malloc(sizeof(char*) * 2);
250
if(argv == NULL){
251
return NULL;
297
252
}
298
}
299
300
free(plugin_node);
253
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
254
argv[1] = NULL;
255
}
256
*argc += 1;
257
argv = realloc(argv, sizeof(char *)
258
* ((unsigned int) *argc + 1));
259
if(argv == NULL){
260
return NULL;
261
}
262
argv[*argc-1] = arg;
263
argv[*argc] = NULL;
264
return argv;
301
265
}
302
266
303
static void free_plugin_list(void){
304
while(plugin_list != NULL){
305
free_plugin(plugin_list);
267
static void free_plugin_list(plugin *plugin_list){
268
for(plugin *next; plugin_list != NULL; plugin_list = next){
269
next = plugin_list->next;
270
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
271
free(*arg);
272
}
273
free(plugin_list->argv);
274
for(char **env = plugin_list->environ; *env != NULL; env++){
275
free(*env);
276
}
277
free(plugin_list->environ);
278
free(plugin_list);
306
279
}
307
280
}
308
281
309
282
int main(int argc, char *argv[]){
310
char *plugindir = NULL;
311
char *argfile = NULL;
283
const char *plugindir = "/lib/mandos/plugins.d";
284
const char *argfile = ARGFILE;
312
285
FILE *conffp;
313
286
size_t d_name_len;
314
287
DIR *dir = NULL;
316
289
struct stat st;
317
290
fd_set rfds_all;
318
291
int ret, maxfd = 0;
319
ssize_t sret;
320
intmax_t tmpmax;
321
292
uid_t uid = 65534;
322
293
gid_t gid = 65534;
323
294
bool debug = false;
348
319
{ .name = "global-options", .key = 'g',
349
320
.arg = "OPTION[,OPTION[,...]]",
350
321
.doc = "Options passed to all plugins" },
351
{ .name = "global-env", .key = 'G',
322
{ .name = "global-envs", .key = 'e',
352
323
.arg = "VAR=value",
353
324
.doc = "Environment variable passed to all plugins" },
354
325
{ .name = "options-for", .key = 'o',
355
326
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
356
327
.doc = "Options passed only to specified plugin" },
357
{ .name = "env-for", .key = 'E',
328
{ .name = "envs-for", .key = 'f',
358
329
.arg = "PLUGIN:ENV=value",
359
330
.doc = "Environment variable passed to specified plugin" },
360
331
{ .name = "disable", .key = 'd',
361
332
.arg = "PLUGIN",
362
333
.doc = "Disable a specific plugin", .group = 1 },
363
{ .name = "enable", .key = 'e',
364
.arg = "PLUGIN",
365
.doc = "Enable a specific plugin", .group = 1 },
366
334
{ .name = "plugin-dir", .key = 128,
367
335
.arg = "DIRECTORY",
368
336
.doc = "Specify a different plugin directory", .group = 2 },
369
{ .name = "config-file", .key = 129,
370
.arg = "FILE",
371
.doc = "Specify a different configuration file", .group = 2 },
372
{ .name = "userid", .key = 130,
373
.arg = "ID", .flags = 0,
374
.doc = "User ID the plugins will run as", .group = 3 },
375
{ .name = "groupid", .key = 131,
376
.arg = "ID", .flags = 0,
377
.doc = "Group ID the plugins will run as", .group = 3 },
378
{ .name = "debug", .key = 132,
379
.doc = "Debug mode", .group = 4 },
337
{ .name = "userid", .key = 129,
338
.arg = "ID", .flags = 0,
339
.doc = "User ID the plugins will run as", .group = 2 },
340
{ .name = "groupid", .key = 130,
341
.arg = "ID", .flags = 0,
342
.doc = "Group ID the plugins will run as", .group = 2 },
343
{ .name = "debug", .key = 131,
344
.doc = "Debug mode", .group = 3 },
380
345
{ .name = NULL }
381
346
};
382
347
383
error_t parse_opt(int key, char *arg, __attribute__((unused))
384
struct argp_state *state){
385
char *tmp;
386
switch(key){
387
case 'g': /* --global-options */
388
if(arg != NULL){
389
char *plugin_option;
390
while((plugin_option = strsep(&arg, ",")) != NULL){
391
if(plugin_option[0] == '\0'){
348
error_t parse_opt (int key, char *arg, struct argp_state *state) {
349
/* Get the INPUT argument from `argp_parse', which we know is a
350
pointer to our plugin list pointer. */
351
plugin **plugins = state->input;
352
switch (key) {
353
case 'g':
354
if (arg != NULL){
355
char *p;
356
while((p = strsep(&arg, ",")) != NULL){
357
if(p[0] == '\0'){
392
358
continue;
393
359
}
394
if(not add_argument(getplugin(NULL), plugin_option)){
360
if(not add_argument(getplugin(NULL, plugins), p)){
395
361
perror("add_argument");
396
362
return ARGP_ERR_UNKNOWN;
397
363
}
398
364
}
399
365
}
400
366
break;
401
case 'G': /* --global-env */
367
case 'e':
402
368
if(arg == NULL){
403
369
break;
404
370
}
405
if(not add_environment(getplugin(NULL), arg, true)){
406
perror("add_environment");
371
{
372
char *envdef = strdup(arg);
373
if(envdef == NULL){
374
break;
375
}
376
if(not add_environment(getplugin(NULL, plugins), envdef)){
377
perror("add_environment");
378
}
407
379
}
408
380
break;
409
case 'o': /* --options-for */
410
if(arg != NULL){
411
char *plugin_name = strsep(&arg, ":");
412
if(plugin_name[0] == '\0'){
413
break;
414
}
415
char *plugin_option;
416
while((plugin_option = strsep(&arg, ",")) != NULL){
417
if(not add_argument(getplugin(plugin_name), plugin_option)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
381
case 'o':
382
if (arg != NULL){
383
char *p_name = strsep(&arg, ":");
384
if(p_name[0] == '\0'){
385
break;
386
}
387
char *opt = strsep(&arg, ":");
388
if(opt[0] == '\0'){
389
break;
390
}
391
if(opt != NULL){
392
char *p;
393
while((p = strsep(&opt, ",")) != NULL){
394
if(p[0] == '\0'){
395
continue;
396
}
397
if(not add_argument(getplugin(p_name, plugins), p)){
398
perror("add_argument");
399
return ARGP_ERR_UNKNOWN;
400
}
420
401
}
421
402
}
422
403
}
423
404
break;
424
case 'E': /* --env-for */
405
case 'f':
425
406
if(arg == NULL){
426
407
break;
427
408
}
430
411
if(envdef == NULL){
431
412
break;
432
413
}
433
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
414
char *p_name = strndup(arg, (size_t) (envdef-arg));
415
if(p_name == NULL){
416
break;
417
}
418
envdef++;
419
if(not add_environment(getplugin(p_name, plugins), envdef)){
435
420
perror("add_environment");
436
421
}
437
422
}
438
423
break;
439
case 'd': /* --disable */
440
if(arg != NULL){
441
plugin *p = getplugin(arg);
424
case 'd':
425
if (arg != NULL){
426
plugin *p = getplugin(arg, plugins);
442
427
if(p == NULL){
443
428
return ARGP_ERR_UNKNOWN;
444
429
}
445
430
p->disabled = true;
446
431
}
447
432
break;
448
case 'e': /* --enable */
449
if(arg != NULL){
450
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
453
}
454
p->disabled = false;
455
}
456
break;
457
case 128: /* --plugin-dir */
458
free(plugindir);
459
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
463
break;
464
case 129: /* --config-file */
465
/* This is already done by parse_opt_config_file() */
466
break;
467
case 130: /* --userid */
468
errno = 0;
469
tmpmax = strtoimax(arg, &tmp, 10);
470
if(errno != 0 or tmp == arg or *tmp != '\0'
471
or tmpmax != (uid_t)tmpmax){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
476
}
477
break;
478
case 131: /* --groupid */
479
errno = 0;
480
tmpmax = strtoimax(arg, &tmp, 10);
481
if(errno != 0 or tmp == arg or *tmp != '\0'
482
or tmpmax != (gid_t)tmpmax){
483
fprintf(stderr, "Bad group ID number: \"%s\", using %"
484
PRIdMAX "\n", arg, (intmax_t)gid);
485
} else {
486
gid = (gid_t)tmpmax;
487
}
488
break;
489
case 132: /* --debug */
433
case 128:
434
plugindir = arg;
435
break;
436
case 129:
437
uid = (uid_t)strtol(arg, NULL, 10);
438
break;
439
case 130:
440
gid = (gid_t)strtol(arg, NULL, 10);
441
break;
442
case 131:
490
443
debug = true;
491
444
break;
492
/*
493
* When adding more options before this line, remember to also add a
494
* "case" to the "parse_opt_config_file" function below.
495
*/
496
case ARGP_KEY_ARG:
497
/* Cryptsetup always passes an argument, which is an empty
498
string if "none" was specified in /etc/crypttab. So if
499
argument was empty, we ignore it silently. */
500
if(arg[0] != '\0'){
501
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
502
}
503
break;
504
case ARGP_KEY_END:
505
break;
506
default:
507
return ARGP_ERR_UNKNOWN;
508
}
509
return 0;
510
}
511
512
/* This option parser is the same as parse_opt() above, except it
513
ignores everything but the --config-file option. */
514
error_t parse_opt_config_file(int key, char *arg,
515
__attribute__((unused))
516
struct argp_state *state){
517
switch(key){
518
case 'g': /* --global-options */
519
case 'G': /* --global-env */
520
case 'o': /* --options-for */
521
case 'E': /* --env-for */
522
case 'd': /* --disable */
523
case 'e': /* --enable */
524
case 128: /* --plugin-dir */
525
break;
526
case 129: /* --config-file */
527
free(argfile);
528
argfile = strdup(arg);
529
if(argfile == NULL){
530
perror("strdup");
531
}
532
break;
533
case 130: /* --userid */
534
case 131: /* --groupid */
535
case 132: /* --debug */
536
case ARGP_KEY_ARG:
537
case ARGP_KEY_END:
538
break;
539
default:
540
return ARGP_ERR_UNKNOWN;
541
}
542
return 0;
543
}
544
545
struct argp argp = { .options = options,
546
.parser = parse_opt_config_file,
547
.args_doc = "",
445
case ARGP_KEY_ARG:
446
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
447
break;
448
case ARGP_KEY_END:
449
break;
450
default:
451
return ARGP_ERR_UNKNOWN;
452
}
453
return 0;
454
}
455
456
plugin *plugin_list = NULL;
457
458
struct argp argp = { .options = options, .parser = parse_opt,
459
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
548
460
.doc = "Mandos plugin runner -- Run plugins" };
549
461
550
/* Parse using parse_opt_config_file() in order to get the custom
551
config file location, if any. */
552
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
553
if(ret == ARGP_ERR_UNKNOWN){
462
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
463
if (ret == ARGP_ERR_UNKNOWN){
554
464
fprintf(stderr, "Unknown error while parsing arguments\n");
555
465
exitstatus = EXIT_FAILURE;
556
466
goto fallback;
557
467
}
558
559
/* Reset to the normal argument parser */
560
argp.parser = parse_opt;
561
562
/* Open the configfile if available */
563
if(argfile == NULL){
564
conffp = fopen(AFILE, "r");
565
} else {
566
conffp = fopen(argfile, "r");
567
}
468
469
conffp = fopen(argfile, "r");
568
470
if(conffp != NULL){
569
471
char *org_line = NULL;
570
472
char *p, *arg, *new_arg, *line;
571
473
size_t size = 0;
474
ssize_t sret;
572
475
const char whitespace_delims[] = " \r\t\f\v\n";
573
476
const char comment_delim[] = "#";
574
575
custom_argc = 1;
576
custom_argv = malloc(sizeof(char*) * 2);
577
if(custom_argv == NULL){
578
perror("malloc");
579
exitstatus = EXIT_FAILURE;
580
goto fallback;
581
}
582
custom_argv[0] = argv[0];
583
custom_argv[1] = NULL;
584
585
/* for each line in the config file, strip whitespace and ignore
586
commented text */
477
587
478
while(true){
588
479
sret = getline(&org_line, &size, conffp);
589
480
if(sret == -1){
590
481
break;
591
482
}
592
483
593
484
line = org_line;
594
485
arg = strsep(&line, comment_delim);
595
486
while((p = strsep(&arg, whitespace_delims)) != NULL){
597
488
continue;
598
489
}
599
490
new_arg = strdup(p);
600
if(new_arg == NULL){
601
perror("strdup");
602
exitstatus = EXIT_FAILURE;
603
free(org_line);
604
goto fallback;
605
}
606
607
custom_argc += 1;
608
custom_argv = realloc(custom_argv, sizeof(char *)
609
* ((unsigned int) custom_argc + 1));
610
if(custom_argv == NULL){
611
perror("realloc");
612
exitstatus = EXIT_FAILURE;
613
free(org_line);
614
goto fallback;
615
}
616
custom_argv[custom_argc-1] = new_arg;
617
custom_argv[custom_argc] = NULL;
491
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
492
if (custom_argv == NULL){
493
perror("add_to_argv");
494
exitstatus = EXIT_FAILURE;
495
goto fallback;
496
}
618
497
}
619
498
}
620
499
free(org_line);
621
} else {
500
} else{
622
501
/* Check for harmful errors and go to fallback. Other errors might
623
502
not affect opening plugins */
624
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
503
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
625
504
perror("fopen");
626
505
exitstatus = EXIT_FAILURE;
627
506
goto fallback;
628
507
}
629
508
}
630
/* If there was any arguments from configuration file,
631
pass them to parser as command arguments */
509
632
510
if(custom_argv != NULL){
633
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
634
0, NULL);
635
if(ret == ARGP_ERR_UNKNOWN){
511
custom_argv[0] = argv[0];
512
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
513
if (ret == ARGP_ERR_UNKNOWN){
636
514
fprintf(stderr, "Unknown error while parsing arguments\n");
637
515
exitstatus = EXIT_FAILURE;
638
516
goto fallback;
639
517
}
640
518
}
641
519
642
/* Parse actual command line arguments, to let them override the
643
config file */
644
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
645
if(ret == ARGP_ERR_UNKNOWN){
646
fprintf(stderr, "Unknown error while parsing arguments\n");
647
exitstatus = EXIT_FAILURE;
648
goto fallback;
649
}
650
651
520
if(debug){
652
521
for(plugin *p = plugin_list; p != NULL; p=p->next){
653
522
fprintf(stderr, "Plugin: %s has %d arguments\n",
655
524
for(char **a = p->argv; *a != NULL; a++){
656
525
fprintf(stderr, "\tArg: %s\n", *a);
657
526
}
658
fprintf(stderr, "...and %d environment variables\n", p->envc);
527
fprintf(stderr, "...and %u environment variables\n", p->envc);
659
528
for(char **a = p->environ; *a != NULL; a++){
660
529
fprintf(stderr, "\t%s\n", *a);
661
530
}
662
531
}
663
532
}
664
533
665
/* Strip permissions down to nobody */
534
ret = setuid(uid);
535
if (ret == -1){
536
perror("setuid");
537
}
538
666
539
setgid(gid);
667
if(ret == -1){
540
if (ret == -1){
668
541
perror("setgid");
669
542
}
670
ret = setuid(uid);
671
if(ret == -1){
672
perror("setuid");
673
}
674
675
if(plugindir == NULL){
676
dir = opendir(PDIR);
677
} else {
678
dir = opendir(plugindir);
679
}
680
543
544
dir = opendir(plugindir);
681
545
if(dir == NULL){
682
546
perror("Could not open plugin dir");
683
547
exitstatus = EXIT_FAILURE;
699
563
700
564
FD_ZERO(&rfds_all);
701
565
702
/* Read and execute any executable in the plugin directory*/
703
566
while(true){
704
567
dirst = readdir(dir);
705
568
706
/* All directory entries have been processed */
569
// All directory entries have been processed
707
570
if(dirst == NULL){
708
if(errno == EBADF){
571
if (errno == EBADF){
709
572
perror("readdir");
710
573
exitstatus = EXIT_FAILURE;
711
574
goto fallback;
715
578
716
579
d_name_len = strlen(dirst->d_name);
717
580
718
/* Ignore dotfiles, backup files and other junk */
581
// Ignore dotfiles, backup files and other junk
719
582
{
720
583
bool bad_name = false;
721
584
723
586
724
587
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
725
588
".dpkg-old",
726
".dpkg-bak",
727
589
".dpkg-divert", NULL };
728
590
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
729
591
size_t pre_len = strlen(*pre);
737
599
break;
738
600
}
739
601
}
602
740
603
if(bad_name){
741
604
continue;
742
605
}
606
743
607
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
744
608
size_t suf_len = strlen(*suf);
745
609
if((d_name_len >= suf_len)
758
622
continue;
759
623
}
760
624
}
761
625
762
626
char *filename;
763
if(plugindir == NULL){
764
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
765
} else {
766
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
767
}
627
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
768
628
if(ret < 0){
769
629
perror("asprintf");
770
630
continue;
771
631
}
772
632
773
633
ret = stat(filename, &st);
774
if(ret == -1){
634
if (ret == -1){
775
635
perror("stat");
776
636
free(filename);
777
637
continue;
778
638
}
779
639
780
/* Ignore non-executable files */
781
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
640
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
782
641
if(debug){
783
642
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
784
643
" with bad type or mode\n", filename);
786
645
free(filename);
787
646
continue;
788
647
}
789
790
plugin *p = getplugin(dirst->d_name);
648
plugin *p = getplugin(dirst->d_name, &plugin_list);
791
649
if(p == NULL){
792
650
perror("getplugin");
793
651
free(filename);
803
661
}
804
662
{
805
663
/* Add global arguments to argument list for this plugin */
806
plugin *g = getplugin(NULL);
664
plugin *g = getplugin(NULL, &plugin_list);
807
665
if(g != NULL){
808
666
for(char **a = g->argv + 1; *a != NULL; a++){
809
667
if(not add_argument(p, *a)){
812
670
}
813
671
/* Add global environment variables */
814
672
for(char **e = g->environ; *e != NULL; e++){
815
if(not add_environment(p, *e, false)){
673
if(not add_environment(p, *e)){
816
674
perror("add_environment");
817
675
}
818
676
}
823
681
process, too. */
824
682
if(p->environ[0] != NULL){
825
683
for(char **e = environ; *e != NULL; e++){
826
if(not add_environment(p, *e, false)){
684
char *copy = strdup(*e);
685
if(copy == NULL){
686
perror("strdup");
687
continue;
688
}
689
if(not add_environment(p, copy)){
827
690
perror("add_environment");
828
691
}
829
692
}
831
694
832
695
int pipefd[2];
833
696
ret = pipe(pipefd);
834
if(ret == -1){
697
if (ret == -1){
835
698
perror("pipe");
836
699
exitstatus = EXIT_FAILURE;
837
700
goto fallback;
838
701
}
839
/* Ask OS to automatic close the pipe on exec */
840
702
ret = set_cloexec_flag(pipefd[0]);
841
703
if(ret < 0){
842
704
perror("set_cloexec_flag");
850
712
goto fallback;
851
713
}
852
714
/* Block SIGCHLD until process is safely in process list */
853
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
715
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
854
716
if(ret < 0){
855
717
perror("sigprocmask");
856
718
exitstatus = EXIT_FAILURE;
857
719
goto fallback;
858
720
}
859
/* Starting a new process to be watched */
721
// Starting a new process to be watched
860
722
pid_t pid = fork();
861
723
if(pid == -1){
862
724
perror("fork");
870
732
perror("sigaction");
871
733
_exit(EXIT_FAILURE);
872
734
}
873
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
735
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
874
736
if(ret < 0){
875
737
perror("sigprocmask");
876
738
_exit(EXIT_FAILURE);
877
739
}
878
740
879
741
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
880
742
if(ret == -1){
881
743
perror("dup2");
900
762
}
901
763
/* no return */
902
764
}
903
/* Parent process */
904
close(pipefd[1]); /* Close unused write end of pipe */
765
/* parent process */
905
766
free(filename);
906
plugin *new_plugin = getplugin(dirst->d_name);
907
if(new_plugin == NULL){
908
perror("getplugin");
909
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
767
close(pipefd[1]); /* close unused write end of pipe */
768
process *new_process = malloc(sizeof(process));
769
if (new_process == NULL){
770
perror("malloc");
771
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
910
772
if(ret < 0){
911
perror("sigprocmask");
773
perror("sigprocmask");
912
774
}
913
775
exitstatus = EXIT_FAILURE;
914
776
goto fallback;
915
777
}
916
778
917
new_plugin->pid = pid;
918
new_plugin->fd = pipefd[0];
919
779
*new_process = (struct process){ .pid = pid,
780
.fd = pipefd[0],
781
.next = process_list };
782
// List handling
783
process_list = new_process;
920
784
/* Unblock SIGCHLD so signal handler can be run if this process
921
785
has already completed */
922
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
786
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
923
787
if(ret < 0){
924
788
perror("sigprocmask");
925
789
exitstatus = EXIT_FAILURE;
926
790
goto fallback;
927
791
}
928
792
929
FD_SET(new_plugin->fd, &rfds_all);
793
FD_SET(new_process->fd, &rfds_all);
930
794
931
if(maxfd < new_plugin->fd){
932
maxfd = new_plugin->fd;
795
if (maxfd < new_process->fd){
796
maxfd = new_process->fd;
933
797
}
798
934
799
}
935
800
801
free_plugin_list(plugin_list);
802
plugin_list = NULL;
803
936
804
closedir(dir);
937
805
dir = NULL;
938
free_plugin(getplugin(NULL));
939
940
for(plugin *p = plugin_list; p != NULL; p = p->next){
941
if(p->pid != 0){
942
break;
943
}
944
if(p->next == NULL){
945
fprintf(stderr, "No plugin processes started. Incorrect plugin"
946
" directory?\n");
947
free_plugin_list();
948
}
806
807
if (process_list == NULL){
808
fprintf(stderr, "No plugin processes started. Incorrect plugin"
809
" directory?\n");
810
process_list = NULL;
949
811
}
950
951
/* Main loop while running plugins exist */
952
while(plugin_list){
812
while(process_list){
953
813
fd_set rfds = rfds_all;
954
814
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
955
if(select_ret == -1){
815
if (select_ret == -1){
956
816
perror("select");
957
817
exitstatus = EXIT_FAILURE;
958
818
goto fallback;
959
819
}
960
820
/* OK, now either a process completed, or something can be read
961
821
from one of them */
962
for(plugin *proc = plugin_list; proc != NULL;){
822
for(process *proc = process_list; proc ; proc = proc->next){
963
823
/* Is this process completely done? */
964
if(proc->completed and proc->eof){
824
if(proc->eof and proc->completed){
965
825
/* Only accept the plugin output if it exited cleanly */
966
826
if(not WIFEXITED(proc->status)
967
827
or WEXITSTATUS(proc->status) != 0){
968
828
/* Bad exit by plugin */
969
970
829
if(debug){
971
830
if(WIFEXITED(proc->status)){
972
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
973
" status %d\n", proc->name,
974
(intmax_t) (proc->pid),
831
fprintf(stderr, "Plugin %u exited with status %d\n",
832
(unsigned int) (proc->pid),
975
833
WEXITSTATUS(proc->status));
976
} else if(WIFSIGNALED(proc->status)){
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
978
" signal %d: %s\n", proc->name,
979
(intmax_t) (proc->pid),
980
WTERMSIG(proc->status),
981
strsignal(WTERMSIG(proc->status)));
834
} else if(WIFSIGNALED(proc->status)) {
835
fprintf(stderr, "Plugin %u killed by signal %d\n",
836
(unsigned int) (proc->pid),
837
WTERMSIG(proc->status));
982
838
} else if(WCOREDUMP(proc->status)){
983
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
984
" core\n", proc->name, (intmax_t) (proc->pid));
839
fprintf(stderr, "Plugin %d dumped core\n",
840
(unsigned int) (proc->pid));
985
841
}
986
842
}
987
988
843
/* Remove the plugin */
989
844
FD_CLR(proc->fd, &rfds_all);
990
991
845
/* Block signal while modifying process_list */
992
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
846
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
993
847
if(ret < 0){
994
848
perror("sigprocmask");
995
849
exitstatus = EXIT_FAILURE;
996
850
goto fallback;
997
851
}
998
999
plugin *next_plugin = proc->next;
1000
free_plugin(proc);
1001
proc = next_plugin;
1002
852
/* Delete this process entry from the list */
853
if(process_list == proc){
854
/* First one - simple */
855
process_list = proc->next;
856
} else {
857
/* Second one or later */
858
for(process *p = process_list; p != NULL; p = p->next){
859
if(p->next == proc){
860
p->next = proc->next;
861
break;
862
}
863
}
864
}
1003
865
/* We are done modifying process list, so unblock signal */
1004
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1005
NULL);
866
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
867
NULL);
1006
868
if(ret < 0){
1007
869
perror("sigprocmask");
1008
exitstatus = EXIT_FAILURE;
1009
goto fallback;
1010
}
1011
1012
if(plugin_list == NULL){
1013
break;
1014
}
1015
1016
continue;
870
}
871
free(proc->buffer);
872
free(proc);
873
/* We deleted this process from the list, so we can't go
874
proc->next. Therefore, start over from the beginning of
875
the process list */
876
break;
1017
877
}
1018
1019
878
/* This process exited nicely, so print its buffer */
1020
1021
bool bret = print_out_password(proc->buffer,
1022
proc->buffer_length);
879
880
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1023
881
if(not bret){
1024
882
perror("print_out_password");
1025
883
exitstatus = EXIT_FAILURE;
1026
884
}
1027
885
goto fallback;
1028
886
}
1029
1030
887
/* This process has not completed. Does it have any output? */
1031
888
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1032
889
/* This process had nothing to say at this time */
1033
proc = proc->next;
1034
890
continue;
1035
891
}
1036
892
/* Before reading, make the process' data buffer large enough */
1037
893
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1038
894
proc->buffer = realloc(proc->buffer, proc->buffer_size
1039
895
+ (size_t) BUFFER_SIZE);
1040
if(proc->buffer == NULL){
896
if (proc->buffer == NULL){
1041
897
perror("malloc");
1042
898
exitstatus = EXIT_FAILURE;
1043
899
goto fallback;
1045
901
proc->buffer_size += BUFFER_SIZE;
1046
902
}
1047
903
/* Read from the process */
1048
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1049
BUFFER_SIZE);
1050
if(sret < 0){
904
ret = read(proc->fd, proc->buffer + proc->buffer_length,
905
BUFFER_SIZE);
906
if(ret < 0){
1051
907
/* Read error from this process; ignore the error */
1052
proc = proc->next;
1053
908
continue;
1054
909
}
1055
if(sret == 0){
910
if(ret == 0){
1056
911
/* got EOF */
1057
912
proc->eof = true;
1058
913
} else {
1059
proc->buffer_length += (size_t) sret;
914
proc->buffer_length += (size_t) ret;
1060
915
}
1061
916
}
1062
917
}
1063
1064
918
919
1065
920
fallback:
1066
921
1067
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1068
/* Fallback if all plugins failed, none are found or an error
1069
occured */
922
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
923
/* Fallback if all plugins failed, none are found or an error occured */
1070
924
bool bret;
1071
925
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1072
926
char *passwordbuffer = getpass("Password: ");
1073
size_t len = strlen(passwordbuffer);
1074
/* Strip trailing newline */
1075
if(len > 0 and passwordbuffer[len-1] == '\n'){
1076
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1077
len--;
1078
}
1079
bret = print_out_password(passwordbuffer, len);
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1080
928
if(not bret){
1081
929
perror("print_out_password");
1082
930
exitstatus = EXIT_FAILURE;
1089
937
perror("sigaction");
1090
938
exitstatus = EXIT_FAILURE;
1091
939
}
1092
940
1093
941
if(custom_argv != NULL){
1094
for(char **arg = custom_argv+1; *arg != NULL; arg++){
942
for(char **arg = custom_argv; *arg != NULL; arg++){
1095
943
free(*arg);
1096
944
}
1097
945
free(custom_argv);
1098
946
}
947
free_plugin_list(plugin_list);
1099
948
1100
949
if(dir != NULL){
1101
950
closedir(dir);
1102
951
}
1103
952
1104
/* Kill the processes */
1105
for(plugin *p = plugin_list; p != NULL; p = p->next){
1106
if(p->pid != 0){
1107
close(p->fd);
1108
ret = kill(p->pid, SIGTERM);
1109
if(ret == -1 and errno != ESRCH){
1110
/* Set-uid proccesses might not get closed */
1111
perror("kill");
1112
}
953
/* Free the process list and kill the processes */
954
for(process *next; process_list != NULL; process_list = next){
955
next = process_list->next;
956
close(process_list->fd);
957
ret = kill(process_list->pid, SIGTERM);
958
if(ret == -1 and errno != ESRCH){
959
/* set-uid proccesses migth not get closed */
960
perror("kill");
1113
961
}
962
free(process_list->buffer);
963
free(process_list);
1114
964
}
1115
965
1116
966
/* Wait for any remaining child processes to terminate */
1121
971
perror("wait");
1122
972
}
1123
973
1124
free_plugin_list();
1125
1126
free(plugindir);
1127
free(argfile);
1128
1129
974
return exitstatus;
1130
975
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0