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- 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,
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;
115
109
if(name != NULL){
116
110
copy_name = strdup(name);
117
111
if(copy_name == NULL){
118
free(new_plugin);
119
112
return NULL;
120
113
}
121
114
}
122
115
123
116
*new_plugin = (plugin) { .name = copy_name,
124
117
.argc = 1,
118
.envc = 0,
125
119
.disabled = false,
126
.next = plugin_list };
120
.next = *plugin_list };
127
121
128
122
new_plugin->argv = malloc(sizeof(char *) * 2);
129
if(new_plugin->argv == NULL){
123
if (new_plugin->argv == NULL){
130
124
free(copy_name);
131
125
free(new_plugin);
132
126
return NULL;
133
127
}
134
128
new_plugin->argv[0] = copy_name;
135
129
new_plugin->argv[1] = NULL;
136
130
137
131
new_plugin->environ = malloc(sizeof(char *));
138
132
if(new_plugin->environ == NULL){
139
133
free(copy_name);
142
136
return NULL;
143
137
}
144
138
new_plugin->environ[0] = NULL;
145
146
139
/* Append the new plugin to the list */
147
plugin_list = new_plugin;
140
*plugin_list = new_plugin;
148
141
return new_plugin;
149
142
}
150
143
180
173
}
181
174
182
175
/* Add to a plugin's environment */
183
static bool add_environment(plugin *p, const char *def, bool replace){
176
static bool add_environment(plugin *p, const char *def){
184
177
if(p == NULL){
185
178
return false;
186
179
}
187
/* namelen = length of name of environment variable */
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
192
/* It already exists */
193
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
196
return false;
197
}
198
*e = new;
199
strcpy(*e, def);
200
}
201
return true;
202
}
203
}
204
180
return add_to_char_array(def, &(p->environ), &(p->envc));
205
181
}
206
182
183
207
184
/*
208
185
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
186
* Descriptor Flags".
210
187
* *Note File Descriptor Flags:(libc)Descriptor Flags.
211
188
*/
212
static int set_cloexec_flag(int fd){
189
static int set_cloexec_flag(int fd)
190
{
213
191
int ret = fcntl(fd, F_GETFD, 0);
214
192
/* If reading the flags failed, return error indication now. */
215
193
if(ret < 0){
219
197
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
198
}
221
199
200
process *process_list = NULL;
222
201
223
/* Mark processes as completed when they exit, and save their exit
202
/* Mark processes as completed when it exits, and save its exit
224
203
status. */
225
static void handle_sigchld(__attribute__((unused)) int sig){
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
226
206
while(true){
227
plugin *proc = plugin_list;
228
207
int status;
229
208
pid_t pid = waitpid(-1, &status, WNOHANG);
230
209
if(pid == 0){
231
/* Only still running child processes */
232
210
break;
233
211
}
234
212
if(pid == -1){
235
if(errno != ECHILD){
213
if (errno != ECHILD){
236
214
perror("waitpid");
237
215
}
238
/* No child processes */
239
break;
216
return;
240
217
}
241
242
/* A child exited, find it in process_list */
218
243
219
while(proc != NULL and proc->pid != pid){
244
220
proc = proc->next;
245
221
}
252
228
}
253
229
}
254
230
255
/* Prints out a password to stdout */
256
static bool print_out_password(const char *buffer, size_t length){
231
bool print_out_password(const char *buffer, size_t length){
257
232
ssize_t ret;
233
if(length>0 and buffer[length-1] == '\n'){
234
length--;
235
}
258
236
for(size_t written = 0; written < length; written += (size_t)ret){
259
237
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
260
238
length - written));
265
243
return true;
266
244
}
267
245
268
/* Removes and free a plugin from the plugin list */
269
static void free_plugin(plugin *plugin_node){
270
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
272
free(*arg);
273
}
274
free(plugin_node->argv);
275
for(char **env = plugin_node->environ; *env != NULL; env++){
276
free(*env);
277
}
278
free(plugin_node->environ);
279
free(plugin_node->buffer);
280
281
/* Removes the plugin from the singly-linked list */
282
if(plugin_node == plugin_list){
283
/* First one - simple */
284
plugin_list = plugin_list->next;
285
} else {
286
/* Second one or later */
287
for(plugin *p = plugin_list; p != NULL; p = p->next){
288
if(p->next == plugin_node){
289
p->next = plugin_node->next;
290
break;
291
}
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;
292
252
}
293
}
294
295
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;
296
265
}
297
266
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
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);
301
279
}
302
280
}
303
281
304
282
int main(int argc, char *argv[]){
305
char *plugindir = NULL;
306
char *argfile = NULL;
283
const char *plugindir = "/lib/mandos/plugins.d";
284
const char *argfile = ARGFILE;
307
285
FILE *conffp;
308
286
size_t d_name_len;
309
287
DIR *dir = NULL;
310
288
struct dirent *dirst;
311
289
struct stat st;
312
290
fd_set rfds_all;
313
int ret, numchars, maxfd = 0;
314
ssize_t sret;
315
intmax_t tmpmax;
291
int ret, maxfd = 0;
316
292
uid_t uid = 65534;
317
293
gid_t gid = 65534;
318
294
bool debug = false;
343
319
{ .name = "global-options", .key = 'g',
344
320
.arg = "OPTION[,OPTION[,...]]",
345
321
.doc = "Options passed to all plugins" },
346
{ .name = "global-env", .key = 'G',
322
{ .name = "global-envs", .key = 'e',
347
323
.arg = "VAR=value",
348
324
.doc = "Environment variable passed to all plugins" },
349
325
{ .name = "options-for", .key = 'o',
350
326
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
351
327
.doc = "Options passed only to specified plugin" },
352
{ .name = "env-for", .key = 'E',
328
{ .name = "envs-for", .key = 'f',
353
329
.arg = "PLUGIN:ENV=value",
354
330
.doc = "Environment variable passed to specified plugin" },
355
331
{ .name = "disable", .key = 'd',
356
332
.arg = "PLUGIN",
357
333
.doc = "Disable a specific plugin", .group = 1 },
358
{ .name = "enable", .key = 'e',
359
.arg = "PLUGIN",
360
.doc = "Enable a specific plugin", .group = 1 },
361
334
{ .name = "plugin-dir", .key = 128,
362
335
.arg = "DIRECTORY",
363
336
.doc = "Specify a different plugin directory", .group = 2 },
364
{ .name = "config-file", .key = 129,
365
.arg = "FILE",
366
.doc = "Specify a different configuration file", .group = 2 },
367
{ .name = "userid", .key = 130,
368
.arg = "ID", .flags = 0,
369
.doc = "User ID the plugins will run as", .group = 3 },
370
{ .name = "groupid", .key = 131,
371
.arg = "ID", .flags = 0,
372
.doc = "Group ID the plugins will run as", .group = 3 },
373
{ .name = "debug", .key = 132,
374
.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 },
375
345
{ .name = NULL }
376
346
};
377
347
378
error_t parse_opt(int key, char *arg, __attribute__((unused))
379
struct argp_state *state) {
380
switch(key) {
381
case 'g': /* --global-options */
382
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){
383
355
char *p;
384
356
while((p = strsep(&arg, ",")) != NULL){
385
357
if(p[0] == '\0'){
386
358
continue;
387
359
}
388
if(not add_argument(getplugin(NULL), p)){
360
if(not add_argument(getplugin(NULL, plugins), p)){
389
361
perror("add_argument");
390
362
return ARGP_ERR_UNKNOWN;
391
363
}
392
364
}
393
365
}
394
366
break;
395
case 'G': /* --global-env */
367
case 'e':
396
368
if(arg == NULL){
397
369
break;
398
370
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
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
}
401
379
}
402
380
break;
403
case 'o': /* --options-for */
404
if(arg != NULL){
381
case 'o':
382
if (arg != NULL){
405
383
char *p_name = strsep(&arg, ":");
406
if(p_name[0] == '\0' or arg == NULL){
384
if(p_name[0] == '\0'){
407
385
break;
408
386
}
409
387
char *opt = strsep(&arg, ":");
410
if(opt[0] == '\0' or opt == NULL){
388
if(opt[0] == '\0'){
411
389
break;
412
390
}
413
char *p;
414
while((p = strsep(&opt, ",")) != NULL){
415
if(p[0] == '\0'){
416
continue;
417
}
418
if(not add_argument(getplugin(p_name), p)){
419
perror("add_argument");
420
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
}
421
401
}
422
402
}
423
403
}
424
404
break;
425
case 'E': /* --env-for */
405
case 'f':
426
406
if(arg == NULL){
427
407
break;
428
408
}
431
411
if(envdef == NULL){
432
412
break;
433
413
}
434
*envdef = '\0';
435
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)){
436
420
perror("add_environment");
437
421
}
438
422
}
439
423
break;
440
case 'd': /* --disable */
441
if(arg != NULL){
442
plugin *p = getplugin(arg);
424
case 'd':
425
if (arg != NULL){
426
plugin *p = getplugin(arg, plugins);
443
427
if(p == NULL){
444
428
return ARGP_ERR_UNKNOWN;
445
429
}
446
430
p->disabled = true;
447
431
}
448
432
break;
449
case 'e': /* --enable */
450
if(arg != NULL){
451
plugin *p = getplugin(arg);
452
if(p == NULL){
453
return ARGP_ERR_UNKNOWN;
454
}
455
p->disabled = false;
456
}
457
break;
458
case 128: /* --plugin-dir */
459
free(plugindir);
460
plugindir = strdup(arg);
461
if(plugindir == NULL){
462
perror("strdup");
463
}
464
break;
465
case 129: /* --config-file */
466
/* This is already done by parse_opt_config_file() */
467
break;
468
case 130: /* --userid */
469
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
470
if(ret < 1 or tmpmax != (uid_t)tmpmax
471
or arg[numchars] != '\0'){
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
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
480
if(ret < 1 or tmpmax != (gid_t)tmpmax
481
or arg[numchars] != '\0'){
482
fprintf(stderr, "Bad group ID number: \"%s\", using %"
483
PRIdMAX "\n", arg, (intmax_t)gid);
484
} else {
485
gid = (gid_t)tmpmax;
486
}
487
break;
488
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:
489
443
debug = true;
490
444
break;
491
/*
492
* When adding more options before this line, remember to also add a
493
* "case" to the "parse_opt_config_file" function below.
494
*/
495
case ARGP_KEY_ARG:
496
/* Cryptsetup always passes an argument, which is an empty
497
string if "none" was specified in /etc/crypttab. So if
498
argument was empty, we ignore it silently. */
499
if(arg[0] != '\0'){
500
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
501
}
502
break;
503
case ARGP_KEY_END:
504
break;
505
default:
506
return ARGP_ERR_UNKNOWN;
507
}
508
return 0;
509
}
510
511
/* This option parser is the same as parse_opt() above, except it
512
ignores everything but the --config-file option. */
513
error_t parse_opt_config_file(int key, char *arg,
514
__attribute__((unused))
515
struct argp_state *state) {
516
switch(key) {
517
case 'g': /* --global-options */
518
case 'G': /* --global-env */
519
case 'o': /* --options-for */
520
case 'E': /* --env-for */
521
case 'd': /* --disable */
522
case 'e': /* --enable */
523
case 128: /* --plugin-dir */
524
break;
525
case 129: /* --config-file */
526
free(argfile);
527
argfile = strdup(arg);
528
if(argfile == NULL){
529
perror("strdup");
530
}
531
break;
532
case 130: /* --userid */
533
case 131: /* --groupid */
534
case 132: /* --debug */
535
case ARGP_KEY_ARG:
536
case ARGP_KEY_END:
537
break;
538
default:
539
return ARGP_ERR_UNKNOWN;
540
}
541
return 0;
542
}
543
544
struct argp argp = { .options = options,
545
.parser = parse_opt_config_file,
546
.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]",
547
460
.doc = "Mandos plugin runner -- Run plugins" };
548
461
549
/* Parse using parse_opt_config_file() in order to get the custom
550
config file location, if any. */
551
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
552
if(ret == ARGP_ERR_UNKNOWN){
462
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
463
if (ret == ARGP_ERR_UNKNOWN){
553
464
fprintf(stderr, "Unknown error while parsing arguments\n");
554
465
exitstatus = EXIT_FAILURE;
555
466
goto fallback;
556
467
}
557
558
/* Reset to the normal argument parser */
559
argp.parser = parse_opt;
560
561
/* Open the configfile if available */
562
if(argfile == NULL){
563
conffp = fopen(AFILE, "r");
564
} else {
565
conffp = fopen(argfile, "r");
566
}
468
469
conffp = fopen(argfile, "r");
567
470
if(conffp != NULL){
568
471
char *org_line = NULL;
569
472
char *p, *arg, *new_arg, *line;
570
473
size_t size = 0;
474
ssize_t sret;
571
475
const char whitespace_delims[] = " \r\t\f\v\n";
572
476
const char comment_delim[] = "#";
573
477
574
custom_argc = 1;
575
custom_argv = malloc(sizeof(char*) * 2);
576
if(custom_argv == NULL){
577
perror("malloc");
578
exitstatus = EXIT_FAILURE;
579
goto fallback;
580
}
581
custom_argv[0] = argv[0];
582
custom_argv[1] = NULL;
583
584
/* for each line in the config file, strip whitespace and ignore
585
commented text */
586
478
while(true){
587
479
sret = getline(&org_line, &size, conffp);
588
480
if(sret == -1){
596
488
continue;
597
489
}
598
490
new_arg = strdup(p);
599
if(new_arg == NULL){
600
perror("strdup");
601
exitstatus = EXIT_FAILURE;
602
free(org_line);
603
goto fallback;
604
}
605
606
custom_argc += 1;
607
custom_argv = realloc(custom_argv, sizeof(char *)
608
* ((unsigned int) custom_argc + 1));
609
if(custom_argv == NULL){
610
perror("realloc");
611
exitstatus = EXIT_FAILURE;
612
free(org_line);
613
goto fallback;
614
}
615
custom_argv[custom_argc-1] = new_arg;
616
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
}
617
497
}
618
498
}
619
499
free(org_line);
620
} else {
500
} else{
621
501
/* Check for harmful errors and go to fallback. Other errors might
622
502
not affect opening plugins */
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
503
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
624
504
perror("fopen");
625
505
exitstatus = EXIT_FAILURE;
626
506
goto fallback;
627
507
}
628
508
}
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
509
631
510
if(custom_argv != NULL){
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
0, NULL);
634
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){
635
514
fprintf(stderr, "Unknown error while parsing arguments\n");
636
515
exitstatus = EXIT_FAILURE;
637
516
goto fallback;
638
517
}
639
518
}
640
519
641
/* Parse actual command line arguments, to let them override the
642
config file */
643
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
644
if(ret == ARGP_ERR_UNKNOWN){
645
fprintf(stderr, "Unknown error while parsing arguments\n");
646
exitstatus = EXIT_FAILURE;
647
goto fallback;
648
}
649
650
520
if(debug){
651
521
for(plugin *p = plugin_list; p != NULL; p=p->next){
652
522
fprintf(stderr, "Plugin: %s has %d arguments\n",
654
524
for(char **a = p->argv; *a != NULL; a++){
655
525
fprintf(stderr, "\tArg: %s\n", *a);
656
526
}
657
fprintf(stderr, "...and %d environment variables\n", p->envc);
527
fprintf(stderr, "...and %u environment variables\n", p->envc);
658
528
for(char **a = p->environ; *a != NULL; a++){
659
529
fprintf(stderr, "\t%s\n", *a);
660
530
}
661
531
}
662
532
}
663
533
664
/* Strip permissions down to nobody */
665
534
ret = setuid(uid);
666
if(ret == -1){
535
if (ret == -1){
667
536
perror("setuid");
668
}
537
}
538
669
539
setgid(gid);
670
if(ret == -1){
540
if (ret == -1){
671
541
perror("setgid");
672
542
}
673
543
674
if(plugindir == NULL){
675
dir = opendir(PDIR);
676
} else {
677
dir = opendir(plugindir);
678
}
679
544
dir = opendir(plugindir);
680
545
if(dir == NULL){
681
546
perror("Could not open plugin dir");
682
547
exitstatus = EXIT_FAILURE;
698
563
699
564
FD_ZERO(&rfds_all);
700
565
701
/* Read and execute any executable in the plugin directory*/
702
566
while(true){
703
567
dirst = readdir(dir);
704
568
705
/* All directory entries have been processed */
569
// All directory entries have been processed
706
570
if(dirst == NULL){
707
if(errno == EBADF){
571
if (errno == EBADF){
708
572
perror("readdir");
709
573
exitstatus = EXIT_FAILURE;
710
574
goto fallback;
714
578
715
579
d_name_len = strlen(dirst->d_name);
716
580
717
/* Ignore dotfiles, backup files and other junk */
581
// Ignore dotfiles, backup files and other junk
718
582
{
719
583
bool bad_name = false;
720
584
722
586
723
587
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
724
588
".dpkg-old",
725
".dpkg-bak",
726
589
".dpkg-divert", NULL };
727
590
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
728
591
size_t pre_len = strlen(*pre);
736
599
break;
737
600
}
738
601
}
602
739
603
if(bad_name){
740
604
continue;
741
605
}
606
742
607
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
743
608
size_t suf_len = strlen(*suf);
744
609
if((d_name_len >= suf_len)
759
624
}
760
625
761
626
char *filename;
762
if(plugindir == NULL){
763
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
764
} else {
765
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
}
627
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
767
628
if(ret < 0){
768
629
perror("asprintf");
769
630
continue;
770
631
}
771
632
772
633
ret = stat(filename, &st);
773
if(ret == -1){
634
if (ret == -1){
774
635
perror("stat");
775
636
free(filename);
776
637
continue;
777
638
}
778
779
/* Ignore non-executable files */
780
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)){
781
641
if(debug){
782
642
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
783
643
" with bad type or mode\n", filename);
785
645
free(filename);
786
646
continue;
787
647
}
788
789
plugin *p = getplugin(dirst->d_name);
648
plugin *p = getplugin(dirst->d_name, &plugin_list);
790
649
if(p == NULL){
791
650
perror("getplugin");
792
651
free(filename);
802
661
}
803
662
{
804
663
/* Add global arguments to argument list for this plugin */
805
plugin *g = getplugin(NULL);
664
plugin *g = getplugin(NULL, &plugin_list);
806
665
if(g != NULL){
807
666
for(char **a = g->argv + 1; *a != NULL; a++){
808
667
if(not add_argument(p, *a)){
811
670
}
812
671
/* Add global environment variables */
813
672
for(char **e = g->environ; *e != NULL; e++){
814
if(not add_environment(p, *e, false)){
673
if(not add_environment(p, *e)){
815
674
perror("add_environment");
816
675
}
817
676
}
822
681
process, too. */
823
682
if(p->environ[0] != NULL){
824
683
for(char **e = environ; *e != NULL; e++){
825
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)){
826
690
perror("add_environment");
827
691
}
828
692
}
830
694
831
695
int pipefd[2];
832
696
ret = pipe(pipefd);
833
if(ret == -1){
697
if (ret == -1){
834
698
perror("pipe");
835
699
exitstatus = EXIT_FAILURE;
836
700
goto fallback;
837
701
}
838
/* Ask OS to automatic close the pipe on exec */
839
702
ret = set_cloexec_flag(pipefd[0]);
840
703
if(ret < 0){
841
704
perror("set_cloexec_flag");
849
712
goto fallback;
850
713
}
851
714
/* Block SIGCHLD until process is safely in process list */
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
715
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
716
if(ret < 0){
854
717
perror("sigprocmask");
855
718
exitstatus = EXIT_FAILURE;
856
719
goto fallback;
857
720
}
858
/* Starting a new process to be watched */
721
// Starting a new process to be watched
859
722
pid_t pid = fork();
860
723
if(pid == -1){
861
724
perror("fork");
869
732
perror("sigaction");
870
733
_exit(EXIT_FAILURE);
871
734
}
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
735
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
873
736
if(ret < 0){
874
737
perror("sigprocmask");
875
738
_exit(EXIT_FAILURE);
876
739
}
877
740
878
741
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
879
742
if(ret == -1){
880
743
perror("dup2");
899
762
}
900
763
/* no return */
901
764
}
902
/* Parent process */
903
close(pipefd[1]); /* Close unused write end of pipe */
765
/* parent process */
904
766
free(filename);
905
plugin *new_plugin = getplugin(dirst->d_name);
906
if(new_plugin == NULL){
907
perror("getplugin");
908
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);
909
772
if(ret < 0){
910
perror("sigprocmask");
773
perror("sigprocmask");
911
774
}
912
775
exitstatus = EXIT_FAILURE;
913
776
goto fallback;
914
777
}
915
778
916
new_plugin->pid = pid;
917
new_plugin->fd = pipefd[0];
918
779
*new_process = (struct process){ .pid = pid,
780
.fd = pipefd[0],
781
.next = process_list };
782
// List handling
783
process_list = new_process;
919
784
/* Unblock SIGCHLD so signal handler can be run if this process
920
785
has already completed */
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
786
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
922
787
if(ret < 0){
923
788
perror("sigprocmask");
924
789
exitstatus = EXIT_FAILURE;
925
790
goto fallback;
926
791
}
927
792
928
FD_SET(new_plugin->fd, &rfds_all);
793
FD_SET(new_process->fd, &rfds_all);
929
794
930
if(maxfd < new_plugin->fd){
931
maxfd = new_plugin->fd;
795
if (maxfd < new_process->fd){
796
maxfd = new_process->fd;
932
797
}
798
933
799
}
934
800
801
free_plugin_list(plugin_list);
802
plugin_list = NULL;
803
935
804
closedir(dir);
936
805
dir = NULL;
937
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
if(p->pid != 0){
940
break;
941
}
942
if(p->next == NULL){
943
fprintf(stderr, "No plugin processes started. Incorrect plugin"
944
" directory?\n");
945
free_plugin_list();
946
}
806
807
if (process_list == NULL){
808
fprintf(stderr, "No plugin processes started. Incorrect plugin"
809
" directory?\n");
810
process_list = NULL;
947
811
}
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
812
while(process_list){
951
813
fd_set rfds = rfds_all;
952
814
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
953
if(select_ret == -1){
815
if (select_ret == -1){
954
816
perror("select");
955
817
exitstatus = EXIT_FAILURE;
956
818
goto fallback;
957
819
}
958
820
/* OK, now either a process completed, or something can be read
959
821
from one of them */
960
for(plugin *proc = plugin_list; proc != NULL;){
822
for(process *proc = process_list; proc ; proc = proc->next){
961
823
/* Is this process completely done? */
962
824
if(proc->eof and proc->completed){
963
825
/* Only accept the plugin output if it exited cleanly */
964
826
if(not WIFEXITED(proc->status)
965
827
or WEXITSTATUS(proc->status) != 0){
966
828
/* Bad exit by plugin */
967
968
829
if(debug){
969
830
if(WIFEXITED(proc->status)){
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
831
fprintf(stderr, "Plugin %u exited with status %d\n",
832
(unsigned int) (proc->pid),
972
833
WEXITSTATUS(proc->status));
973
834
} else if(WIFSIGNALED(proc->status)) {
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
835
fprintf(stderr, "Plugin %u killed by signal %d\n",
836
(unsigned int) (proc->pid),
976
837
WTERMSIG(proc->status));
977
838
} else if(WCOREDUMP(proc->status)){
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
839
fprintf(stderr, "Plugin %d dumped core\n",
840
(unsigned int) (proc->pid));
980
841
}
981
842
}
982
983
843
/* Remove the plugin */
984
844
FD_CLR(proc->fd, &rfds_all);
985
986
845
/* Block signal while modifying process_list */
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
846
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
988
847
if(ret < 0){
989
848
perror("sigprocmask");
990
849
exitstatus = EXIT_FAILURE;
991
850
goto fallback;
992
851
}
993
994
plugin *next_plugin = proc->next;
995
free_plugin(proc);
996
proc = next_plugin;
997
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
}
998
865
/* We are done modifying process list, so unblock signal */
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
866
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
867
NULL);
1001
868
if(ret < 0){
1002
869
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1004
goto fallback;
1005
}
1006
1007
if(plugin_list == NULL){
1008
break;
1009
}
1010
1011
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;
1012
877
}
1013
1014
878
/* This process exited nicely, so print its buffer */
1015
1016
bool bret = print_out_password(proc->buffer,
1017
proc->buffer_length);
879
880
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1018
881
if(not bret){
1019
882
perror("print_out_password");
1020
883
exitstatus = EXIT_FAILURE;
1021
884
}
1022
885
goto fallback;
1023
886
}
1024
1025
887
/* This process has not completed. Does it have any output? */
1026
888
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1027
889
/* This process had nothing to say at this time */
1028
proc = proc->next;
1029
890
continue;
1030
891
}
1031
892
/* Before reading, make the process' data buffer large enough */
1032
893
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1033
894
proc->buffer = realloc(proc->buffer, proc->buffer_size
1034
895
+ (size_t) BUFFER_SIZE);
1035
if(proc->buffer == NULL){
896
if (proc->buffer == NULL){
1036
897
perror("malloc");
1037
898
exitstatus = EXIT_FAILURE;
1038
899
goto fallback;
1040
901
proc->buffer_size += BUFFER_SIZE;
1041
902
}
1042
903
/* Read from the process */
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1045
if(sret < 0){
904
ret = read(proc->fd, proc->buffer + proc->buffer_length,
905
BUFFER_SIZE);
906
if(ret < 0){
1046
907
/* Read error from this process; ignore the error */
1047
proc = proc->next;
1048
908
continue;
1049
909
}
1050
if(sret == 0){
910
if(ret == 0){
1051
911
/* got EOF */
1052
912
proc->eof = true;
1053
913
} else {
1054
proc->buffer_length += (size_t) sret;
914
proc->buffer_length += (size_t) ret;
1055
915
}
1056
916
}
1057
917
}
1059
919
1060
920
fallback:
1061
921
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1063
/* Fallback if all plugins failed, none are found or an error
1064
occured */
922
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
923
/* Fallback if all plugins failed, none are found or an error occured */
1065
924
bool bret;
1066
925
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1067
926
char *passwordbuffer = getpass("Password: ");
1068
size_t len = strlen(passwordbuffer);
1069
/* Strip trailing newline */
1070
if(len > 0 and passwordbuffer[len-1] == '\n'){
1071
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1072
len--;
1073
}
1074
bret = print_out_password(passwordbuffer, len);
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1075
928
if(not bret){
1076
929
perror("print_out_password");
1077
930
exitstatus = EXIT_FAILURE;
1084
937
perror("sigaction");
1085
938
exitstatus = EXIT_FAILURE;
1086
939
}
1087
940
1088
941
if(custom_argv != NULL){
1089
for(char **arg = custom_argv+1; *arg != NULL; arg++){
942
for(char **arg = custom_argv; *arg != NULL; arg++){
1090
943
free(*arg);
1091
944
}
1092
945
free(custom_argv);
1093
946
}
947
free_plugin_list(plugin_list);
1094
948
1095
949
if(dir != NULL){
1096
950
closedir(dir);
1097
951
}
1098
952
1099
/* Kill the processes */
1100
for(plugin *p = plugin_list; p != NULL; p = p->next){
1101
if(p->pid != 0){
1102
close(p->fd);
1103
ret = kill(p->pid, SIGTERM);
1104
if(ret == -1 and errno != ESRCH){
1105
/* Set-uid proccesses might not get closed */
1106
perror("kill");
1107
}
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");
1108
961
}
962
free(process_list->buffer);
963
free(process_list);
1109
964
}
1110
965
1111
966
/* Wait for any remaining child processes to terminate */
1116
971
perror("wait");
1117
972
}
1118
973
1119
free_plugin_list();
1120
1121
free(plugindir);
1122
free(argfile);
1123
1124
974
return exitstatus;
1125
975
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0