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- Committer: Björn Påhlsson
- Date: 2009-01-19 05:59:35 UTC
- mfrom: (278 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 291.
- Revision ID: belorn@braxen-20090119055935-0ce8dnr4hvz5m5v2
merge
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
32
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
46
47
fcntl(), setuid(), setgid(),
47
48
F_GETFD, F_SETFD, FD_CLOEXEC,
48
49
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
dup2(), STDOUT_FILENO, _exit(),
50
51
execv(), write(), read(),
51
52
close() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
63
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
65
SIG_UNBLOCK, kill() */
65
66
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
66
68
67
69
#define BUFFER_SIZE 256
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
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;
71
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
76
73
struct process;
77
typedef struct plugin{
78
char *name; /* can be NULL or any plugin name */
79
char **argv;
80
int argc;
81
char **environ;
82
int envc;
83
bool disabled;
74
84
75
typedef struct process{
85
/* Variables used for running processes*/
76
86
pid_t pid;
77
87
int fd;
78
88
char *buffer;
81
91
bool eof;
82
92
volatile bool completed;
83
93
volatile int status;
84
struct process *next;
85
} process;
86
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
89
char **argv;
90
int argc;
91
char **environ;
92
int envc;
93
bool disabled;
94
94
struct plugin *next;
95
95
} plugin;
96
96
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
99
if ((p->name == name)
100
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
101
106
return p;
102
107
}
103
108
}
104
109
/* Create a new plugin */
105
110
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
111
if(new_plugin == NULL){
107
112
return NULL;
108
113
}
109
114
char *copy_name = NULL;
110
115
if(name != NULL){
111
116
copy_name = strdup(name);
112
117
if(copy_name == NULL){
118
free(new_plugin);
113
119
return NULL;
114
120
}
115
121
}
116
122
117
123
*new_plugin = (plugin) { .name = copy_name,
118
124
.argc = 1,
119
.envc = 0,
120
125
.disabled = false,
121
.next = *plugin_list };
126
.next = plugin_list };
122
127
123
128
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
129
if(new_plugin->argv == NULL){
125
130
free(copy_name);
126
131
free(new_plugin);
127
132
return NULL;
128
133
}
129
134
new_plugin->argv[0] = copy_name;
130
135
new_plugin->argv[1] = NULL;
131
136
132
137
new_plugin->environ = malloc(sizeof(char *));
133
138
if(new_plugin->environ == NULL){
134
139
free(copy_name);
137
142
return NULL;
138
143
}
139
144
new_plugin->environ[0] = NULL;
145
140
146
/* Append the new plugin to the list */
141
*plugin_list = new_plugin;
147
plugin_list = new_plugin;
142
148
return new_plugin;
143
149
}
144
150
174
180
}
175
181
176
182
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
183
static bool add_environment(plugin *p, const char *def, bool replace){
178
184
if(p == NULL){
179
185
return false;
180
186
}
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
}
181
204
return add_to_char_array(def, &(p->environ), &(p->envc));
182
205
}
183
206
184
185
207
/*
186
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
209
* Descriptor Flags".
188
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
189
211
*/
190
static int set_cloexec_flag(int fd)
191
{
212
static int set_cloexec_flag(int fd){
192
213
int ret = fcntl(fd, F_GETFD, 0);
193
214
/* If reading the flags failed, return error indication now. */
194
215
if(ret < 0){
198
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
199
220
}
200
221
201
process *process_list = NULL;
202
222
203
223
/* Mark processes as completed when they exit, and save their exit
204
224
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
225
static void handle_sigchld(__attribute__((unused)) int sig){
206
226
while(true){
207
process *proc = process_list;
227
plugin *proc = plugin_list;
208
228
int status;
209
229
pid_t pid = waitpid(-1, &status, WNOHANG);
210
230
if(pid == 0){
212
232
break;
213
233
}
214
234
if(pid == -1){
215
if (errno != ECHILD){
235
if(errno != ECHILD){
216
236
perror("waitpid");
217
237
}
218
238
/* No child processes */
219
239
break;
220
240
}
221
241
222
242
/* A child exited, find it in process_list */
223
243
while(proc != NULL and proc->pid != pid){
224
244
proc = proc->next;
232
252
}
233
253
}
234
254
235
bool print_out_password(const char *buffer, size_t length){
255
/* Prints out a password to stdout */
256
static bool print_out_password(const char *buffer, size_t length){
236
257
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
258
for(size_t written = 0; written < length; written += (size_t)ret){
241
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
260
length - written));
247
265
return true;
248
266
}
249
267
250
char **add_to_argv(char **argv, int *argc, char *arg){
251
if (argv == NULL){
252
*argc = 1;
253
argv = malloc(sizeof(char*) * 2);
254
if(argv == NULL){
255
return NULL;
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
}
256
292
}
257
argv[0] = NULL; /* Will be set to argv[0] in main before
258
parsing */
259
argv[1] = NULL;
260
}
261
*argc += 1;
262
argv = realloc(argv, sizeof(char *)
263
* ((unsigned int) *argc + 1));
264
if(argv == NULL){
265
return NULL;
266
}
267
argv[*argc-1] = arg;
268
argv[*argc] = NULL;
269
return argv;
293
}
294
295
free(plugin_node);
270
296
}
271
297
272
static void free_plugin_list(plugin *plugin_list){
273
for(plugin *next; plugin_list != NULL; plugin_list = next){
274
next = plugin_list->next;
275
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
276
free(*arg);
277
}
278
free(plugin_list->argv);
279
for(char **env = plugin_list->environ; *env != NULL; env++){
280
free(*env);
281
}
282
free(plugin_list->environ);
283
free(plugin_list);
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
284
301
}
285
302
}
286
303
287
304
int main(int argc, char *argv[]){
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
305
char *plugindir = NULL;
306
char *argfile = NULL;
290
307
FILE *conffp;
291
308
size_t d_name_len;
292
309
DIR *dir = NULL;
293
310
struct dirent *dirst;
294
311
struct stat st;
295
312
fd_set rfds_all;
296
int ret, maxfd = 0;
313
int ret, numchars, maxfd = 0;
314
ssize_t sret;
315
intmax_t tmpmax;
297
316
uid_t uid = 65534;
298
317
gid_t gid = 65534;
299
318
bool debug = false;
324
343
{ .name = "global-options", .key = 'g',
325
344
.arg = "OPTION[,OPTION[,...]]",
326
345
.doc = "Options passed to all plugins" },
327
{ .name = "global-envs", .key = 'e',
346
{ .name = "global-env", .key = 'G',
328
347
.arg = "VAR=value",
329
348
.doc = "Environment variable passed to all plugins" },
330
349
{ .name = "options-for", .key = 'o',
331
350
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
332
351
.doc = "Options passed only to specified plugin" },
333
{ .name = "envs-for", .key = 'f',
352
{ .name = "env-for", .key = 'E',
334
353
.arg = "PLUGIN:ENV=value",
335
354
.doc = "Environment variable passed to specified plugin" },
336
355
{ .name = "disable", .key = 'd',
337
356
.arg = "PLUGIN",
338
357
.doc = "Disable a specific plugin", .group = 1 },
358
{ .name = "enable", .key = 'e',
359
.arg = "PLUGIN",
360
.doc = "Enable a specific plugin", .group = 1 },
339
361
{ .name = "plugin-dir", .key = 128,
340
362
.arg = "DIRECTORY",
341
363
.doc = "Specify a different plugin directory", .group = 2 },
342
{ .name = "userid", .key = 129,
343
.arg = "ID", .flags = 0,
344
.doc = "User ID the plugins will run as", .group = 2 },
345
{ .name = "groupid", .key = 130,
346
.arg = "ID", .flags = 0,
347
.doc = "Group ID the plugins will run as", .group = 2 },
348
{ .name = "debug", .key = 131,
349
.doc = "Debug mode", .group = 3 },
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 },
350
375
{ .name = NULL }
351
376
};
352
377
353
error_t parse_opt (int key, char *arg, struct argp_state *state) {
354
/* Get the INPUT argument from `argp_parse', which we know is a
355
pointer to our plugin list pointer. */
356
plugin **plugins = state->input;
357
switch (key) {
358
case 'g':
359
if (arg != NULL){
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){
360
383
char *p;
361
384
while((p = strsep(&arg, ",")) != NULL){
362
385
if(p[0] == '\0'){
363
386
continue;
364
387
}
365
if(not add_argument(getplugin(NULL, plugins), p)){
388
if(not add_argument(getplugin(NULL), p)){
366
389
perror("add_argument");
367
390
return ARGP_ERR_UNKNOWN;
368
391
}
369
392
}
370
393
}
371
394
break;
372
case 'e':
395
case 'G': /* --global-env */
373
396
if(arg == NULL){
374
397
break;
375
398
}
376
{
377
char *envdef = strdup(arg);
378
if(envdef == NULL){
379
break;
380
}
381
if(not add_environment(getplugin(NULL, plugins), envdef)){
382
perror("add_environment");
383
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
384
401
}
385
402
break;
386
case 'o':
387
if (arg != NULL){
403
case 'o': /* --options-for */
404
if(arg != NULL){
388
405
char *p_name = strsep(&arg, ":");
389
if(p_name[0] == '\0'){
406
if(p_name[0] == '\0' or arg == NULL){
390
407
break;
391
408
}
392
409
char *opt = strsep(&arg, ":");
393
if(opt[0] == '\0'){
410
if(opt[0] == '\0' or opt == NULL){
394
411
break;
395
412
}
396
if(opt != NULL){
397
char *p;
398
while((p = strsep(&opt, ",")) != NULL){
399
if(p[0] == '\0'){
400
continue;
401
}
402
if(not add_argument(getplugin(p_name, plugins), p)){
403
perror("add_argument");
404
return ARGP_ERR_UNKNOWN;
405
}
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;
406
421
}
407
422
}
408
423
}
409
424
break;
410
case 'f':
425
case 'E': /* --env-for */
411
426
if(arg == NULL){
412
427
break;
413
428
}
416
431
if(envdef == NULL){
417
432
break;
418
433
}
419
char *p_name = strndup(arg, (size_t) (envdef-arg));
420
if(p_name == NULL){
421
break;
422
}
423
envdef++;
424
if(not add_environment(getplugin(p_name, plugins), envdef)){
434
*envdef = '\0';
435
if(not add_environment(getplugin(arg), envdef+1, true)){
425
436
perror("add_environment");
426
437
}
427
438
}
428
439
break;
429
case 'd':
430
if (arg != NULL){
431
plugin *p = getplugin(arg, plugins);
440
case 'd': /* --disable */
441
if(arg != NULL){
442
plugin *p = getplugin(arg);
432
443
if(p == NULL){
433
444
return ARGP_ERR_UNKNOWN;
434
445
}
435
446
p->disabled = true;
436
447
}
437
448
break;
438
case 128:
439
plugindir = arg;
440
break;
441
case 129:
442
uid = (uid_t)strtol(arg, NULL, 10);
443
break;
444
case 130:
445
gid = (gid_t)strtol(arg, NULL, 10);
446
break;
447
case 131:
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 */
448
489
debug = true;
449
490
break;
450
case ARGP_KEY_ARG:
451
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
452
break;
453
case ARGP_KEY_END:
454
break;
455
default:
456
return ARGP_ERR_UNKNOWN;
457
}
458
return 0;
459
}
460
461
plugin *plugin_list = NULL;
462
463
struct argp argp = { .options = options, .parser = parse_opt,
464
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
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 = "",
465
547
.doc = "Mandos plugin runner -- Run plugins" };
466
548
467
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
468
if (ret == ARGP_ERR_UNKNOWN){
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){
469
553
fprintf(stderr, "Unknown error while parsing arguments\n");
470
554
exitstatus = EXIT_FAILURE;
471
555
goto fallback;
472
556
}
473
474
conffp = fopen(argfile, "r");
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
}
475
567
if(conffp != NULL){
476
568
char *org_line = NULL;
477
569
char *p, *arg, *new_arg, *line;
478
570
size_t size = 0;
479
ssize_t sret;
480
571
const char whitespace_delims[] = " \r\t\f\v\n";
481
572
const char comment_delim[] = "#";
482
573
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 */
483
586
while(true){
484
587
sret = getline(&org_line, &size, conffp);
485
588
if(sret == -1){
493
596
continue;
494
597
}
495
598
new_arg = strdup(p);
496
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
497
if (custom_argv == NULL){
498
perror("add_to_argv");
499
exitstatus = EXIT_FAILURE;
500
goto fallback;
501
}
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;
502
617
}
503
618
}
504
619
free(org_line);
505
} else{
620
} else {
506
621
/* Check for harmful errors and go to fallback. Other errors might
507
622
not affect opening plugins */
508
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
509
624
perror("fopen");
510
625
exitstatus = EXIT_FAILURE;
511
626
goto fallback;
512
627
}
513
628
}
514
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
515
631
if(custom_argv != NULL){
516
custom_argv[0] = argv[0];
517
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,
518
&plugin_list);
519
if (ret == ARGP_ERR_UNKNOWN){
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
0, NULL);
634
if(ret == ARGP_ERR_UNKNOWN){
520
635
fprintf(stderr, "Unknown error while parsing arguments\n");
521
636
exitstatus = EXIT_FAILURE;
522
637
goto fallback;
523
638
}
524
639
}
525
640
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
526
650
if(debug){
527
651
for(plugin *p = plugin_list; p != NULL; p=p->next){
528
652
fprintf(stderr, "Plugin: %s has %d arguments\n",
530
654
for(char **a = p->argv; *a != NULL; a++){
531
655
fprintf(stderr, "\tArg: %s\n", *a);
532
656
}
533
fprintf(stderr, "...and %u environment variables\n", p->envc);
657
fprintf(stderr, "...and %d environment variables\n", p->envc);
534
658
for(char **a = p->environ; *a != NULL; a++){
535
659
fprintf(stderr, "\t%s\n", *a);
536
660
}
537
661
}
538
662
}
539
663
664
/* Strip permissions down to nobody */
540
665
ret = setuid(uid);
541
if (ret == -1){
666
if(ret == -1){
542
667
perror("setuid");
543
}
544
668
}
545
669
setgid(gid);
546
if (ret == -1){
670
if(ret == -1){
547
671
perror("setgid");
548
672
}
549
673
550
dir = opendir(plugindir);
674
if(plugindir == NULL){
675
dir = opendir(PDIR);
676
} else {
677
dir = opendir(plugindir);
678
}
679
551
680
if(dir == NULL){
552
681
perror("Could not open plugin dir");
553
682
exitstatus = EXIT_FAILURE;
569
698
570
699
FD_ZERO(&rfds_all);
571
700
701
/* Read and execute any executable in the plugin directory*/
572
702
while(true){
573
703
dirst = readdir(dir);
574
704
575
// All directory entries have been processed
705
/* All directory entries have been processed */
576
706
if(dirst == NULL){
577
if (errno == EBADF){
707
if(errno == EBADF){
578
708
perror("readdir");
579
709
exitstatus = EXIT_FAILURE;
580
710
goto fallback;
584
714
585
715
d_name_len = strlen(dirst->d_name);
586
716
587
// Ignore dotfiles, backup files and other junk
717
/* Ignore dotfiles, backup files and other junk */
588
718
{
589
719
bool bad_name = false;
590
720
592
722
593
723
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
594
724
".dpkg-old",
725
".dpkg-bak",
595
726
".dpkg-divert", NULL };
596
727
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
597
728
size_t pre_len = strlen(*pre);
605
736
break;
606
737
}
607
738
}
608
609
739
if(bad_name){
610
740
continue;
611
741
}
612
613
742
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
614
743
size_t suf_len = strlen(*suf);
615
744
if((d_name_len >= suf_len)
630
759
}
631
760
632
761
char *filename;
633
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
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
}
634
767
if(ret < 0){
635
768
perror("asprintf");
636
769
continue;
637
770
}
638
771
639
772
ret = stat(filename, &st);
640
if (ret == -1){
773
if(ret == -1){
641
774
perror("stat");
642
775
free(filename);
643
776
continue;
644
777
}
645
646
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
778
779
/* Ignore non-executable files */
780
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
647
781
if(debug){
648
782
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
649
783
" with bad type or mode\n", filename);
651
785
free(filename);
652
786
continue;
653
787
}
654
plugin *p = getplugin(dirst->d_name, &plugin_list);
788
789
plugin *p = getplugin(dirst->d_name);
655
790
if(p == NULL){
656
791
perror("getplugin");
657
792
free(filename);
667
802
}
668
803
{
669
804
/* Add global arguments to argument list for this plugin */
670
plugin *g = getplugin(NULL, &plugin_list);
805
plugin *g = getplugin(NULL);
671
806
if(g != NULL){
672
807
for(char **a = g->argv + 1; *a != NULL; a++){
673
808
if(not add_argument(p, *a)){
676
811
}
677
812
/* Add global environment variables */
678
813
for(char **e = g->environ; *e != NULL; e++){
679
if(not add_environment(p, *e)){
814
if(not add_environment(p, *e, false)){
680
815
perror("add_environment");
681
816
}
682
817
}
687
822
process, too. */
688
823
if(p->environ[0] != NULL){
689
824
for(char **e = environ; *e != NULL; e++){
690
char *copy = strdup(*e);
691
if(copy == NULL){
692
perror("strdup");
693
continue;
694
}
695
if(not add_environment(p, copy)){
825
if(not add_environment(p, *e, false)){
696
826
perror("add_environment");
697
827
}
698
828
}
700
830
701
831
int pipefd[2];
702
832
ret = pipe(pipefd);
703
if (ret == -1){
833
if(ret == -1){
704
834
perror("pipe");
705
835
exitstatus = EXIT_FAILURE;
706
836
goto fallback;
707
837
}
838
/* Ask OS to automatic close the pipe on exec */
708
839
ret = set_cloexec_flag(pipefd[0]);
709
840
if(ret < 0){
710
841
perror("set_cloexec_flag");
718
849
goto fallback;
719
850
}
720
851
/* Block SIGCHLD until process is safely in process list */
721
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
722
853
if(ret < 0){
723
854
perror("sigprocmask");
724
855
exitstatus = EXIT_FAILURE;
725
856
goto fallback;
726
857
}
727
// Starting a new process to be watched
858
/* Starting a new process to be watched */
728
859
pid_t pid = fork();
729
860
if(pid == -1){
730
861
perror("fork");
738
869
perror("sigaction");
739
870
_exit(EXIT_FAILURE);
740
871
}
741
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
742
873
if(ret < 0){
743
874
perror("sigprocmask");
744
875
_exit(EXIT_FAILURE);
745
876
}
746
877
747
878
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
748
879
if(ret == -1){
749
880
perror("dup2");
768
899
}
769
900
/* no return */
770
901
}
771
/* parent process */
902
/* Parent process */
903
close(pipefd[1]); /* Close unused write end of pipe */
772
904
free(filename);
773
close(pipefd[1]); /* close unused write end of pipe */
774
process *new_process = malloc(sizeof(process));
775
if (new_process == NULL){
776
perror("malloc");
777
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
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);
778
909
if(ret < 0){
779
perror("sigprocmask");
910
perror("sigprocmask");
780
911
}
781
912
exitstatus = EXIT_FAILURE;
782
913
goto fallback;
783
914
}
784
915
785
*new_process = (struct process){ .pid = pid,
786
.fd = pipefd[0],
787
.next = process_list };
788
// List handling
789
process_list = new_process;
916
new_plugin->pid = pid;
917
new_plugin->fd = pipefd[0];
918
790
919
/* Unblock SIGCHLD so signal handler can be run if this process
791
920
has already completed */
792
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
793
922
if(ret < 0){
794
923
perror("sigprocmask");
795
924
exitstatus = EXIT_FAILURE;
796
925
goto fallback;
797
926
}
798
927
799
FD_SET(new_process->fd, &rfds_all);
928
FD_SET(new_plugin->fd, &rfds_all);
800
929
801
if (maxfd < new_process->fd){
802
maxfd = new_process->fd;
930
if(maxfd < new_plugin->fd){
931
maxfd = new_plugin->fd;
803
932
}
804
805
933
}
806
934
807
free_plugin_list(plugin_list);
808
plugin_list = NULL;
809
810
935
closedir(dir);
811
936
dir = NULL;
812
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
815
" directory?\n");
816
process_list = NULL;
937
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
if(p->pid != 0){
940
break;
941
}
942
if(p->next == NULL){
943
fprintf(stderr, "No plugin processes started. Incorrect plugin"
944
" directory?\n");
945
free_plugin_list();
946
}
817
947
}
818
while(process_list){
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
819
951
fd_set rfds = rfds_all;
820
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
821
if (select_ret == -1){
953
if(select_ret == -1){
822
954
perror("select");
823
955
exitstatus = EXIT_FAILURE;
824
956
goto fallback;
825
957
}
826
958
/* OK, now either a process completed, or something can be read
827
959
from one of them */
828
for(process *proc = process_list; proc ; proc = proc->next){
960
for(plugin *proc = plugin_list; proc != NULL;){
829
961
/* Is this process completely done? */
830
962
if(proc->eof and proc->completed){
831
963
/* Only accept the plugin output if it exited cleanly */
832
964
if(not WIFEXITED(proc->status)
833
965
or WEXITSTATUS(proc->status) != 0){
834
966
/* Bad exit by plugin */
967
835
968
if(debug){
836
969
if(WIFEXITED(proc->status)){
837
fprintf(stderr, "Plugin %u exited with status %d\n",
838
(unsigned int) (proc->pid),
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
839
972
WEXITSTATUS(proc->status));
840
973
} else if(WIFSIGNALED(proc->status)) {
841
fprintf(stderr, "Plugin %u killed by signal %d\n",
842
(unsigned int) (proc->pid),
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
843
976
WTERMSIG(proc->status));
844
977
} else if(WCOREDUMP(proc->status)){
845
fprintf(stderr, "Plugin %d dumped core\n",
846
(unsigned int) (proc->pid));
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
847
980
}
848
981
}
982
849
983
/* Remove the plugin */
850
984
FD_CLR(proc->fd, &rfds_all);
985
851
986
/* Block signal while modifying process_list */
852
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
988
if(ret < 0){
855
990
exitstatus = EXIT_FAILURE;
856
991
goto fallback;
857
992
}
858
/* Delete this process entry from the list */
859
if(process_list == proc){
860
/* First one - simple */
861
process_list = proc->next;
862
} else {
863
/* Second one or later */
864
for(process *p = process_list; p != NULL; p = p->next){
865
if(p->next == proc){
866
p->next = proc->next;
867
break;
868
}
869
}
870
}
993
994
plugin *next_plugin = proc->next;
995
free_plugin(proc);
996
proc = next_plugin;
997
871
998
/* We are done modifying process list, so unblock signal */
872
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
873
NULL);
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
874
1001
if(ret < 0){
875
1002
perror("sigprocmask");
876
}
877
free(proc->buffer);
878
free(proc);
879
/* We deleted this process from the list, so we can't go
880
proc->next. Therefore, start over from the beginning of
881
the process list */
882
break;
1003
exitstatus = EXIT_FAILURE;
1004
goto fallback;
1005
}
1006
1007
if(plugin_list == NULL){
1008
break;
1009
}
1010
1011
continue;
883
1012
}
1013
884
1014
/* This process exited nicely, so print its buffer */
885
1015
886
1016
bool bret = print_out_password(proc->buffer,
887
1017
proc->buffer_length);
888
1018
if(not bret){
891
1021
}
892
1022
goto fallback;
893
1023
}
1024
894
1025
/* This process has not completed. Does it have any output? */
895
1026
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
896
1027
/* This process had nothing to say at this time */
1028
proc = proc->next;
897
1029
continue;
898
1030
}
899
1031
/* Before reading, make the process' data buffer large enough */
900
1032
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
901
1033
proc->buffer = realloc(proc->buffer, proc->buffer_size
902
1034
+ (size_t) BUFFER_SIZE);
903
if (proc->buffer == NULL){
1035
if(proc->buffer == NULL){
904
1036
perror("malloc");
905
1037
exitstatus = EXIT_FAILURE;
906
1038
goto fallback;
908
1040
proc->buffer_size += BUFFER_SIZE;
909
1041
}
910
1042
/* Read from the process */
911
ret = read(proc->fd, proc->buffer + proc->buffer_length,
912
BUFFER_SIZE);
913
if(ret < 0){
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1045
if(sret < 0){
914
1046
/* Read error from this process; ignore the error */
1047
proc = proc->next;
915
1048
continue;
916
1049
}
917
if(ret == 0){
1050
if(sret == 0){
918
1051
/* got EOF */
919
1052
proc->eof = true;
920
1053
} else {
921
proc->buffer_length += (size_t) ret;
1054
proc->buffer_length += (size_t) sret;
922
1055
}
923
1056
}
924
1057
}
926
1059
927
1060
fallback:
928
1061
929
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
930
1063
/* Fallback if all plugins failed, none are found or an error
931
1064
occured */
932
1065
bool bret;
933
1066
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
934
1067
char *passwordbuffer = getpass("Password: ");
935
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
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);
936
1075
if(not bret){
937
1076
perror("print_out_password");
938
1077
exitstatus = EXIT_FAILURE;
945
1084
perror("sigaction");
946
1085
exitstatus = EXIT_FAILURE;
947
1086
}
948
1087
949
1088
if(custom_argv != NULL){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
1089
for(char **arg = custom_argv+1; *arg != NULL; arg++){
951
1090
free(*arg);
952
1091
}
953
1092
free(custom_argv);
954
1093
}
955
free_plugin_list(plugin_list);
956
1094
957
1095
if(dir != NULL){
958
1096
closedir(dir);
959
1097
}
960
1098
961
/* Free the process list and kill the processes */
962
for(process *next; process_list != NULL; process_list = next){
963
next = process_list->next;
964
close(process_list->fd);
965
ret = kill(process_list->pid, SIGTERM);
966
if(ret == -1 and errno != ESRCH){
967
/* set-uid proccesses migth not get closed */
968
perror("kill");
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
}
969
1108
}
970
free(process_list->buffer);
971
free(process_list);
972
1109
}
973
1110
974
1111
/* Wait for any remaining child processes to terminate */
979
1116
perror("wait");
980
1117
}
981
1118
1119
free_plugin_list();
1120
1121
free(plugindir);
1122
free(argfile);
1123
982
1124
return exitstatus;
983
1125
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0