To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« 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: (237.7.1 mandos) (24.1.154 mandos)
- 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,
47
46
fcntl(), setuid(), setgid(),
48
47
F_GETFD, F_SETFD, FD_CLOEXEC,
49
48
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
51
50
execv(), write(), read(),
52
51
close() */
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
57
56
#include <argp.h> /* struct argp_option, struct
58
57
argp_state, struct argp,
59
58
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
60
#include <signal.h> /* struct sigaction, sigemptyset(),
63
61
sigaddset(), sigaction(),
64
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
63
SIG_UNBLOCK, kill() */
66
64
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
68
65
69
66
#define BUFFER_SIZE 256
70
71
#define PDIR "/lib/mandos/plugins.d"
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
74
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";
75
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
76
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
77
86
typedef struct plugin{
78
87
char *name; /* can be NULL or any plugin name */
79
88
char **argv;
81
90
char **environ;
82
91
int envc;
83
92
bool disabled;
84
85
/* Variables used for running processes*/
86
pid_t pid;
87
int fd;
88
char *buffer;
89
size_t buffer_size;
90
size_t buffer_length;
91
bool eof;
92
volatile bool completed;
93
volatile int status;
94
93
struct plugin *next;
95
94
} plugin;
96
95
97
static plugin *plugin_list = NULL;
98
99
/* Gets an existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
if((p->name == name)
105
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))){
106
100
return p;
107
101
}
108
102
}
109
103
/* Create a new plugin */
110
104
plugin *new_plugin = malloc(sizeof(plugin));
111
if(new_plugin == NULL){
105
if (new_plugin == NULL){
112
106
return NULL;
113
107
}
114
108
char *copy_name = NULL;
121
115
122
116
*new_plugin = (plugin) { .name = copy_name,
123
117
.argc = 1,
118
.envc = 0,
124
119
.disabled = false,
125
.next = plugin_list };
120
.next = *plugin_list };
126
121
127
122
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if(new_plugin->argv == NULL){
123
if (new_plugin->argv == NULL){
129
124
free(copy_name);
130
125
free(new_plugin);
131
126
return NULL;
132
127
}
133
128
new_plugin->argv[0] = copy_name;
134
129
new_plugin->argv[1] = NULL;
135
130
136
131
new_plugin->environ = malloc(sizeof(char *));
137
132
if(new_plugin->environ == NULL){
138
133
free(copy_name);
141
136
return NULL;
142
137
}
143
138
new_plugin->environ[0] = NULL;
144
145
139
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
140
*plugin_list = new_plugin;
147
141
return new_plugin;
148
142
}
149
143
179
173
}
180
174
181
175
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
176
static bool add_environment(plugin *p, const char *def){
183
177
if(p == NULL){
184
178
return false;
185
179
}
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
191
/* It already exists */
192
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
195
return false;
196
}
197
*e = new;
198
strcpy(*e, def);
199
}
200
return true;
201
}
202
}
203
180
return add_to_char_array(def, &(p->environ), &(p->envc));
204
181
}
205
182
183
206
184
/*
207
185
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
186
* Descriptor Flags".
209
187
* *Note File Descriptor Flags:(libc)Descriptor Flags.
210
188
*/
211
static int set_cloexec_flag(int fd){
189
static int set_cloexec_flag(int fd)
190
{
212
191
int ret = fcntl(fd, F_GETFD, 0);
213
192
/* If reading the flags failed, return error indication now. */
214
193
if(ret < 0){
218
197
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
219
198
}
220
199
200
process *process_list = NULL;
221
201
222
/* Mark processes as completed when they exit, and save their exit
202
/* Mark processes as completed when it exits, and save its exit
223
203
status. */
224
static void handle_sigchld(__attribute__((unused)) int sig){
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
225
206
while(true){
226
plugin *proc = plugin_list;
227
207
int status;
228
208
pid_t pid = waitpid(-1, &status, WNOHANG);
229
209
if(pid == 0){
230
/* Only still running child processes */
231
210
break;
232
211
}
233
212
if(pid == -1){
234
if(errno != ECHILD){
213
if (errno != ECHILD){
235
214
perror("waitpid");
236
215
}
237
/* No child processes */
238
break;
216
return;
239
217
}
240
241
/* A child exited, find it in process_list */
218
242
219
while(proc != NULL and proc->pid != pid){
243
220
proc = proc->next;
244
221
}
251
228
}
252
229
}
253
230
254
/* Prints out a password to stdout */
255
static bool print_out_password(const char *buffer, size_t length){
231
bool print_out_password(const char *buffer, size_t length){
256
232
ssize_t ret;
233
if(length>0 and buffer[length-1] == '\n'){
234
length--;
235
}
257
236
for(size_t written = 0; written < length; written += (size_t)ret){
258
237
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
259
238
length - written));
264
243
return true;
265
244
}
266
245
267
/* Removes and free a plugin from the plugin list */
268
static void free_plugin(plugin *plugin_node){
269
270
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
271
free(*arg);
272
}
273
free(plugin_node->argv);
274
for(char **env = plugin_node->environ; *env != NULL; env++){
275
free(*env);
276
}
277
free(plugin_node->environ);
278
free(plugin_node->buffer);
279
280
/* Removes the plugin from the singly-linked list */
281
if(plugin_node == plugin_list){
282
/* First one - simple */
283
plugin_list = plugin_list->next;
284
} else {
285
/* Second one or later */
286
for(plugin *p = plugin_list; p != NULL; p = p->next){
287
if(p->next == plugin_node){
288
p->next = plugin_node->next;
289
break;
290
}
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;
291
252
}
292
}
293
294
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;
295
265
}
296
266
297
static void free_plugin_list(void){
298
while(plugin_list != NULL){
299
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);
300
279
}
301
280
}
302
281
303
282
int main(int argc, char *argv[]){
304
char *plugindir = NULL;
305
char *argfile = NULL;
283
const char *plugindir = "/lib/mandos/plugins.d";
284
const char *argfile = ARGFILE;
306
285
FILE *conffp;
307
286
size_t d_name_len;
308
287
DIR *dir = NULL;
309
288
struct dirent *dirst;
310
289
struct stat st;
311
290
fd_set rfds_all;
312
int ret, numchars, maxfd = 0;
313
ssize_t sret;
314
intmax_t tmpmax;
291
int ret, maxfd = 0;
315
292
uid_t uid = 65534;
316
293
gid_t gid = 65534;
317
294
bool debug = false;
342
319
{ .name = "global-options", .key = 'g',
343
320
.arg = "OPTION[,OPTION[,...]]",
344
321
.doc = "Options passed to all plugins" },
345
{ .name = "global-env", .key = 'G',
322
{ .name = "global-envs", .key = 'e',
346
323
.arg = "VAR=value",
347
324
.doc = "Environment variable passed to all plugins" },
348
325
{ .name = "options-for", .key = 'o',
349
326
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
350
327
.doc = "Options passed only to specified plugin" },
351
{ .name = "env-for", .key = 'E',
328
{ .name = "envs-for", .key = 'f',
352
329
.arg = "PLUGIN:ENV=value",
353
330
.doc = "Environment variable passed to specified plugin" },
354
331
{ .name = "disable", .key = 'd',
355
332
.arg = "PLUGIN",
356
333
.doc = "Disable a specific plugin", .group = 1 },
357
{ .name = "enable", .key = 'e',
358
.arg = "PLUGIN",
359
.doc = "Enable a specific plugin", .group = 1 },
360
334
{ .name = "plugin-dir", .key = 128,
361
335
.arg = "DIRECTORY",
362
336
.doc = "Specify a different plugin directory", .group = 2 },
363
{ .name = "config-file", .key = 129,
364
.arg = "FILE",
365
.doc = "Specify a different configuration file", .group = 2 },
366
{ .name = "userid", .key = 130,
367
.arg = "ID", .flags = 0,
368
.doc = "User ID the plugins will run as", .group = 3 },
369
{ .name = "groupid", .key = 131,
370
.arg = "ID", .flags = 0,
371
.doc = "Group ID the plugins will run as", .group = 3 },
372
{ .name = "debug", .key = 132,
373
.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 },
374
345
{ .name = NULL }
375
346
};
376
347
377
error_t parse_opt(int key, char *arg, __attribute__((unused))
378
struct argp_state *state) {
379
switch(key) {
380
case 'g': /* --global-options */
381
if(arg != NULL){
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){
382
355
char *p;
383
356
while((p = strsep(&arg, ",")) != NULL){
384
357
if(p[0] == '\0'){
385
358
continue;
386
359
}
387
if(not add_argument(getplugin(NULL), p)){
360
if(not add_argument(getplugin(NULL, plugins), p)){
388
361
perror("add_argument");
389
362
return ARGP_ERR_UNKNOWN;
390
363
}
391
364
}
392
365
}
393
366
break;
394
case 'G': /* --global-env */
367
case 'e':
395
368
if(arg == NULL){
396
369
break;
397
370
}
398
if(not add_environment(getplugin(NULL), arg, true)){
399
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
}
400
379
}
401
380
break;
402
case 'o': /* --options-for */
403
if(arg != NULL){
381
case 'o':
382
if (arg != NULL){
404
383
char *p_name = strsep(&arg, ":");
405
if(p_name[0] == '\0' or arg == NULL){
384
if(p_name[0] == '\0'){
406
385
break;
407
386
}
408
387
char *opt = strsep(&arg, ":");
409
if(opt[0] == '\0' or opt == NULL){
388
if(opt[0] == '\0'){
410
389
break;
411
390
}
412
char *p;
413
while((p = strsep(&opt, ",")) != NULL){
414
if(p[0] == '\0'){
415
continue;
416
}
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
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
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
469
if(ret < 1 or tmpmax != (uid_t)tmpmax
470
or arg[numchars] != '\0'){
471
fprintf(stderr, "Bad user ID number: \"%s\", using %"
472
PRIdMAX "\n", arg, (intmax_t)uid);
473
} else {
474
uid = (uid_t)tmpmax;
475
}
476
break;
477
case 131: /* --groupid */
478
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
479
if(ret < 1 or tmpmax != (gid_t)tmpmax
480
or arg[numchars] != '\0'){
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 */
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:
488
443
debug = true;
489
444
break;
490
/*
491
* When adding more options before this line, remember to also add a
492
* "case" to the "parse_opt_config_file" function below.
493
*/
494
case ARGP_KEY_ARG:
495
/* Cryptsetup always passes an argument, which is an empty
496
string if "none" was specified in /etc/crypttab. So if
497
argument was empty, we ignore it silently. */
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
500
}
501
break;
502
case ARGP_KEY_END:
503
break;
504
default:
505
return ARGP_ERR_UNKNOWN;
506
}
507
return 0;
508
}
509
510
/* This option parser is the same as parse_opt() above, except it
511
ignores everything but the --config-file option. */
512
error_t parse_opt_config_file(int key, char *arg,
513
__attribute__((unused))
514
struct argp_state *state) {
515
switch(key) {
516
case 'g': /* --global-options */
517
case 'G': /* --global-env */
518
case 'o': /* --options-for */
519
case 'E': /* --env-for */
520
case 'd': /* --disable */
521
case 'e': /* --enable */
522
case 128: /* --plugin-dir */
523
break;
524
case 129: /* --config-file */
525
free(argfile);
526
argfile = strdup(arg);
527
if(argfile == NULL){
528
perror("strdup");
529
}
530
break;
531
case 130: /* --userid */
532
case 131: /* --groupid */
533
case 132: /* --debug */
534
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
536
break;
537
default:
538
return ARGP_ERR_UNKNOWN;
539
}
540
return 0;
541
}
542
543
struct argp argp = { .options = options,
544
.parser = parse_opt_config_file,
545
.args_doc = "",
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]",
546
460
.doc = "Mandos plugin runner -- Run plugins" };
547
461
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){
462
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
463
if (ret == ARGP_ERR_UNKNOWN){
552
464
fprintf(stderr, "Unknown error while parsing arguments\n");
553
465
exitstatus = EXIT_FAILURE;
554
466
goto fallback;
555
467
}
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
}
468
469
conffp = fopen(argfile, "r");
566
470
if(conffp != NULL){
567
471
char *org_line = NULL;
568
472
char *p, *arg, *new_arg, *line;
569
473
size_t size = 0;
474
ssize_t sret;
570
475
const char whitespace_delims[] = " \r\t\f\v\n";
571
476
const char comment_delim[] = "#";
572
477
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 */
585
478
while(true){
586
479
sret = getline(&org_line, &size, conffp);
587
480
if(sret == -1){
595
488
continue;
596
489
}
597
490
new_arg = strdup(p);
598
if(new_arg == NULL){
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
601
free(org_line);
602
goto fallback;
603
}
604
605
custom_argc += 1;
606
custom_argv = realloc(custom_argv, sizeof(char *)
607
* ((unsigned int) custom_argc + 1));
608
if(custom_argv == NULL){
609
perror("realloc");
610
exitstatus = EXIT_FAILURE;
611
free(org_line);
612
goto fallback;
613
}
614
custom_argv[custom_argc-1] = new_arg;
615
custom_argv[custom_argc] = NULL;
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
}
616
497
}
617
498
}
618
499
free(org_line);
619
} else {
500
} else{
620
501
/* Check for harmful errors and go to fallback. Other errors might
621
502
not affect opening plugins */
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
503
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
504
perror("fopen");
624
505
exitstatus = EXIT_FAILURE;
625
506
goto fallback;
626
507
}
627
508
}
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
509
630
510
if(custom_argv != NULL){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
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){
634
514
fprintf(stderr, "Unknown error while parsing arguments\n");
635
515
exitstatus = EXIT_FAILURE;
636
516
goto fallback;
637
517
}
638
518
}
639
519
640
/* Parse actual command line arguments, to let them override the
641
config file */
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
646
goto fallback;
647
}
648
649
520
if(debug){
650
521
for(plugin *p = plugin_list; p != NULL; p=p->next){
651
522
fprintf(stderr, "Plugin: %s has %d arguments\n",
653
524
for(char **a = p->argv; *a != NULL; a++){
654
525
fprintf(stderr, "\tArg: %s\n", *a);
655
526
}
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
527
fprintf(stderr, "...and %u environment variables\n", p->envc);
657
528
for(char **a = p->environ; *a != NULL; a++){
658
529
fprintf(stderr, "\t%s\n", *a);
659
530
}
660
531
}
661
532
}
662
533
663
/* Strip permissions down to nobody */
664
534
ret = setuid(uid);
665
if(ret == -1){
535
if (ret == -1){
666
536
perror("setuid");
667
}
537
}
538
668
539
setgid(gid);
669
if(ret == -1){
540
if (ret == -1){
670
541
perror("setgid");
671
542
}
672
543
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
677
}
678
544
dir = opendir(plugindir);
679
545
if(dir == NULL){
680
546
perror("Could not open plugin dir");
681
547
exitstatus = EXIT_FAILURE;
697
563
698
564
FD_ZERO(&rfds_all);
699
565
700
/* Read and execute any executable in the plugin directory*/
701
566
while(true){
702
567
dirst = readdir(dir);
703
568
704
/* All directory entries have been processed */
569
// All directory entries have been processed
705
570
if(dirst == NULL){
706
if(errno == EBADF){
571
if (errno == EBADF){
707
572
perror("readdir");
708
573
exitstatus = EXIT_FAILURE;
709
574
goto fallback;
713
578
714
579
d_name_len = strlen(dirst->d_name);
715
580
716
/* Ignore dotfiles, backup files and other junk */
581
// Ignore dotfiles, backup files and other junk
717
582
{
718
583
bool bad_name = false;
719
584
721
586
722
587
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
723
588
".dpkg-old",
724
".dpkg-bak",
725
589
".dpkg-divert", NULL };
726
590
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
727
591
size_t pre_len = strlen(*pre);
735
599
break;
736
600
}
737
601
}
602
738
603
if(bad_name){
739
604
continue;
740
605
}
606
741
607
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
742
608
size_t suf_len = strlen(*suf);
743
609
if((d_name_len >= suf_len)
758
624
}
759
625
760
626
char *filename;
761
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
763
} else {
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
765
}
627
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
628
if(ret < 0){
767
629
perror("asprintf");
768
630
continue;
769
631
}
770
632
771
633
ret = stat(filename, &st);
772
if(ret == -1){
634
if (ret == -1){
773
635
perror("stat");
774
636
free(filename);
775
637
continue;
776
638
}
777
778
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
639
640
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
780
641
if(debug){
781
642
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
782
643
" with bad type or mode\n", filename);
784
645
free(filename);
785
646
continue;
786
647
}
787
788
plugin *p = getplugin(dirst->d_name);
648
plugin *p = getplugin(dirst->d_name, &plugin_list);
789
649
if(p == NULL){
790
650
perror("getplugin");
791
651
free(filename);
801
661
}
802
662
{
803
663
/* Add global arguments to argument list for this plugin */
804
plugin *g = getplugin(NULL);
664
plugin *g = getplugin(NULL, &plugin_list);
805
665
if(g != NULL){
806
666
for(char **a = g->argv + 1; *a != NULL; a++){
807
667
if(not add_argument(p, *a)){
810
670
}
811
671
/* Add global environment variables */
812
672
for(char **e = g->environ; *e != NULL; e++){
813
if(not add_environment(p, *e, false)){
673
if(not add_environment(p, *e)){
814
674
perror("add_environment");
815
675
}
816
676
}
821
681
process, too. */
822
682
if(p->environ[0] != NULL){
823
683
for(char **e = environ; *e != NULL; e++){
824
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)){
825
690
perror("add_environment");
826
691
}
827
692
}
829
694
830
695
int pipefd[2];
831
696
ret = pipe(pipefd);
832
if(ret == -1){
697
if (ret == -1){
833
698
perror("pipe");
834
699
exitstatus = EXIT_FAILURE;
835
700
goto fallback;
836
701
}
837
/* Ask OS to automatic close the pipe on exec */
838
702
ret = set_cloexec_flag(pipefd[0]);
839
703
if(ret < 0){
840
704
perror("set_cloexec_flag");
848
712
goto fallback;
849
713
}
850
714
/* Block SIGCHLD until process is safely in process list */
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
715
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
852
716
if(ret < 0){
853
717
perror("sigprocmask");
854
718
exitstatus = EXIT_FAILURE;
855
719
goto fallback;
856
720
}
857
/* Starting a new process to be watched */
721
// Starting a new process to be watched
858
722
pid_t pid = fork();
859
723
if(pid == -1){
860
724
perror("fork");
868
732
perror("sigaction");
869
733
_exit(EXIT_FAILURE);
870
734
}
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
735
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
736
if(ret < 0){
873
737
perror("sigprocmask");
874
738
_exit(EXIT_FAILURE);
875
739
}
876
740
877
741
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
878
742
if(ret == -1){
879
743
perror("dup2");
898
762
}
899
763
/* no return */
900
764
}
901
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
765
/* parent process */
903
766
free(filename);
904
plugin *new_plugin = getplugin(dirst->d_name);
905
if(new_plugin == NULL){
906
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
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);
908
772
if(ret < 0){
909
perror("sigprocmask");
773
perror("sigprocmask");
910
774
}
911
775
exitstatus = EXIT_FAILURE;
912
776
goto fallback;
913
777
}
914
778
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
917
779
*new_process = (struct process){ .pid = pid,
780
.fd = pipefd[0],
781
.next = process_list };
782
// List handling
783
process_list = new_process;
918
784
/* Unblock SIGCHLD so signal handler can be run if this process
919
785
has already completed */
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
786
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
921
787
if(ret < 0){
922
788
perror("sigprocmask");
923
789
exitstatus = EXIT_FAILURE;
924
790
goto fallback;
925
791
}
926
792
927
FD_SET(new_plugin->fd, &rfds_all);
793
FD_SET(new_process->fd, &rfds_all);
928
794
929
if(maxfd < new_plugin->fd){
930
maxfd = new_plugin->fd;
795
if (maxfd < new_process->fd){
796
maxfd = new_process->fd;
931
797
}
798
932
799
}
933
800
801
free_plugin_list(plugin_list);
802
plugin_list = NULL;
803
934
804
closedir(dir);
935
805
dir = NULL;
936
937
for(plugin *p = plugin_list; p != NULL; p = p->next){
938
if(p->pid != 0){
939
break;
940
}
941
if(p->next == NULL){
942
fprintf(stderr, "No plugin processes started. Incorrect plugin"
943
" directory?\n");
944
free_plugin_list();
945
}
806
807
if (process_list == NULL){
808
fprintf(stderr, "No plugin processes started. Incorrect plugin"
809
" directory?\n");
810
process_list = NULL;
946
811
}
947
948
/* Main loop while running plugins exist */
949
while(plugin_list){
812
while(process_list){
950
813
fd_set rfds = rfds_all;
951
814
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
952
if(select_ret == -1){
815
if (select_ret == -1){
953
816
perror("select");
954
817
exitstatus = EXIT_FAILURE;
955
818
goto fallback;
956
819
}
957
820
/* OK, now either a process completed, or something can be read
958
821
from one of them */
959
for(plugin *proc = plugin_list; proc != NULL;){
822
for(process *proc = process_list; proc ; proc = proc->next){
960
823
/* Is this process completely done? */
961
824
if(proc->eof and proc->completed){
962
825
/* Only accept the plugin output if it exited cleanly */
963
826
if(not WIFEXITED(proc->status)
964
827
or WEXITSTATUS(proc->status) != 0){
965
828
/* Bad exit by plugin */
966
967
829
if(debug){
968
830
if(WIFEXITED(proc->status)){
969
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
970
" %d\n", (intmax_t) (proc->pid),
831
fprintf(stderr, "Plugin %u exited with status %d\n",
832
(unsigned int) (proc->pid),
971
833
WEXITSTATUS(proc->status));
972
834
} else if(WIFSIGNALED(proc->status)) {
973
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
974
" %d\n", (intmax_t) (proc->pid),
835
fprintf(stderr, "Plugin %u killed by signal %d\n",
836
(unsigned int) (proc->pid),
975
837
WTERMSIG(proc->status));
976
838
} else if(WCOREDUMP(proc->status)){
977
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
978
(intmax_t) (proc->pid));
839
fprintf(stderr, "Plugin %d dumped core\n",
840
(unsigned int) (proc->pid));
979
841
}
980
842
}
981
982
843
/* Remove the plugin */
983
844
FD_CLR(proc->fd, &rfds_all);
984
985
845
/* Block signal while modifying process_list */
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
846
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
987
847
if(ret < 0){
988
848
perror("sigprocmask");
989
849
exitstatus = EXIT_FAILURE;
990
850
goto fallback;
991
851
}
992
993
plugin *next_plugin = proc->next;
994
free_plugin(proc);
995
proc = next_plugin;
996
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
}
997
865
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
866
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
867
NULL);
1000
868
if(ret < 0){
1001
869
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1003
goto fallback;
1004
}
1005
1006
if(plugin_list == NULL){
1007
break;
1008
}
1009
1010
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;
1011
877
}
1012
1013
878
/* This process exited nicely, so print its buffer */
1014
1015
bool bret = print_out_password(proc->buffer,
1016
proc->buffer_length);
879
880
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1017
881
if(not bret){
1018
882
perror("print_out_password");
1019
883
exitstatus = EXIT_FAILURE;
1020
884
}
1021
885
goto fallback;
1022
886
}
1023
1024
887
/* This process has not completed. Does it have any output? */
1025
888
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1026
889
/* This process had nothing to say at this time */
1027
proc = proc->next;
1028
890
continue;
1029
891
}
1030
892
/* Before reading, make the process' data buffer large enough */
1031
893
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1032
894
proc->buffer = realloc(proc->buffer, proc->buffer_size
1033
895
+ (size_t) BUFFER_SIZE);
1034
if(proc->buffer == NULL){
896
if (proc->buffer == NULL){
1035
897
perror("malloc");
1036
898
exitstatus = EXIT_FAILURE;
1037
899
goto fallback;
1039
901
proc->buffer_size += BUFFER_SIZE;
1040
902
}
1041
903
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1044
if(sret < 0){
904
ret = read(proc->fd, proc->buffer + proc->buffer_length,
905
BUFFER_SIZE);
906
if(ret < 0){
1045
907
/* Read error from this process; ignore the error */
1046
proc = proc->next;
1047
908
continue;
1048
909
}
1049
if(sret == 0){
910
if(ret == 0){
1050
911
/* got EOF */
1051
912
proc->eof = true;
1052
913
} else {
1053
proc->buffer_length += (size_t) sret;
914
proc->buffer_length += (size_t) ret;
1054
915
}
1055
916
}
1056
917
}
1058
919
1059
920
fallback:
1060
921
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1062
/* Fallback if all plugins failed, none are found or an error
1063
occured */
922
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
923
/* Fallback if all plugins failed, none are found or an error occured */
1064
924
bool bret;
1065
925
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1066
926
char *passwordbuffer = getpass("Password: ");
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);
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1074
928
if(not bret){
1075
929
perror("print_out_password");
1076
930
exitstatus = EXIT_FAILURE;
1083
937
perror("sigaction");
1084
938
exitstatus = EXIT_FAILURE;
1085
939
}
1086
940
1087
941
if(custom_argv != NULL){
1088
for(char **arg = custom_argv+1; *arg != NULL; arg++){
942
for(char **arg = custom_argv; *arg != NULL; arg++){
1089
943
free(*arg);
1090
944
}
1091
945
free(custom_argv);
1092
946
}
947
free_plugin_list(plugin_list);
1093
948
1094
949
if(dir != NULL){
1095
950
closedir(dir);
1096
951
}
1097
952
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
}
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");
1107
961
}
962
free(process_list->buffer);
963
free(process_list);
1108
964
}
1109
965
1110
966
/* Wait for any remaining child processes to terminate */
1115
971
perror("wait");
1116
972
}
1117
973
1118
free_plugin_list();
1119
1120
free(plugindir);
1121
free(argfile);
1122
1123
974
return exitstatus;
1124
975
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0