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- Committer: Teddy Hogeborn
- Date: 2008-08-24 23:18:18 UTC
- Revision ID: teddy@fukt.bsnet.se-20080824231818-4cgr5zekodg4s0dl
* initramfs-tools-hook: Added "--enable-dsa2" and "--trust-model
always" options to gpg.
always" options to gpg.
- 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 a process as completed when it exits, and save its exit
223
203
status. */
224
static void handle_sigchld(__attribute__((unused)) int sig){
225
while(true){
226
plugin *proc = plugin_list;
227
int status;
228
pid_t pid = waitpid(-1, &status, WNOHANG);
229
if(pid == 0){
230
/* Only still running child processes */
231
break;
232
}
233
if(pid == -1){
234
if(errno != ECHILD){
235
perror("waitpid");
236
}
237
/* No child processes */
238
break;
239
}
240
241
/* A child exited, find it in process_list */
242
while(proc != NULL and proc->pid != pid){
243
proc = proc->next;
244
}
245
if(proc == NULL){
246
/* Process not found in process list */
247
continue;
248
}
249
proc->status = status;
250
proc->completed = true;
251
}
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
206
int status;
207
pid_t pid = wait(&status);
208
if(pid == -1){
209
perror("wait");
210
return;
211
}
212
while(proc != NULL and proc->pid != pid){
213
proc = proc->next;
214
}
215
if(proc == NULL){
216
/* Process not found in process list */
217
return;
218
}
219
proc->status = status;
220
proc->completed = true;
252
221
}
253
222
254
/* Prints out a password to stdout */
255
static bool print_out_password(const char *buffer, size_t length){
223
bool print_out_password(const char *buffer, size_t length){
256
224
ssize_t ret;
225
if(length>0 and buffer[length-1] == '\n'){
226
length--;
227
}
257
228
for(size_t written = 0; written < length; written += (size_t)ret){
258
229
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
259
230
length - written));
264
235
return true;
265
236
}
266
237
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
}
238
char **add_to_argv(char **argv, int *argc, char *arg){
239
if (argv == NULL){
240
*argc = 1;
241
argv = malloc(sizeof(char*) * 2);
242
if(argv == NULL){
243
return NULL;
291
244
}
292
}
293
294
free(plugin_node);
245
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
246
argv[1] = NULL;
247
}
248
*argc += 1;
249
argv = realloc(argv, sizeof(char *)
250
* ((unsigned int) *argc + 1));
251
if(argv == NULL){
252
return NULL;
253
}
254
argv[*argc-1] = arg;
255
argv[*argc] = NULL;
256
return argv;
295
257
}
296
258
297
static void free_plugin_list(void){
298
while(plugin_list != NULL){
299
free_plugin(plugin_list);
259
static void free_plugin_list(plugin *plugin_list){
260
for(plugin *next; plugin_list != NULL; plugin_list = next){
261
next = plugin_list->next;
262
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
263
free(*arg);
264
}
265
free(plugin_list->argv);
266
for(char **env = plugin_list->environ; *env != NULL; env++){
267
free(*env);
268
}
269
free(plugin_list->environ);
270
free(plugin_list);
300
271
}
301
272
}
302
273
303
274
int main(int argc, char *argv[]){
304
char *plugindir = NULL;
305
char *argfile = NULL;
275
const char *plugindir = "/lib/mandos/plugins.d";
276
const char *argfile = ARGFILE;
306
277
FILE *conffp;
307
278
size_t d_name_len;
308
279
DIR *dir = NULL;
309
280
struct dirent *dirst;
310
281
struct stat st;
311
282
fd_set rfds_all;
312
int ret, numchars, maxfd = 0;
313
ssize_t sret;
314
intmax_t tmpmax;
283
int ret, maxfd = 0;
315
284
uid_t uid = 65534;
316
285
gid_t gid = 65534;
317
286
bool debug = false;
342
311
{ .name = "global-options", .key = 'g',
343
312
.arg = "OPTION[,OPTION[,...]]",
344
313
.doc = "Options passed to all plugins" },
345
{ .name = "global-env", .key = 'G',
314
{ .name = "global-envs", .key = 'e',
346
315
.arg = "VAR=value",
347
316
.doc = "Environment variable passed to all plugins" },
348
317
{ .name = "options-for", .key = 'o',
349
318
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
350
319
.doc = "Options passed only to specified plugin" },
351
{ .name = "env-for", .key = 'E',
320
{ .name = "envs-for", .key = 'f',
352
321
.arg = "PLUGIN:ENV=value",
353
322
.doc = "Environment variable passed to specified plugin" },
354
323
{ .name = "disable", .key = 'd',
355
324
.arg = "PLUGIN",
356
325
.doc = "Disable a specific plugin", .group = 1 },
357
{ .name = "enable", .key = 'e',
358
.arg = "PLUGIN",
359
.doc = "Enable a specific plugin", .group = 1 },
360
326
{ .name = "plugin-dir", .key = 128,
361
327
.arg = "DIRECTORY",
362
328
.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 },
329
{ .name = "userid", .key = 129,
330
.arg = "ID", .flags = 0,
331
.doc = "User ID the plugins will run as", .group = 2 },
332
{ .name = "groupid", .key = 130,
333
.arg = "ID", .flags = 0,
334
.doc = "Group ID the plugins will run as", .group = 2 },
335
{ .name = "debug", .key = 131,
336
.doc = "Debug mode", .group = 3 },
374
337
{ .name = NULL }
375
338
};
376
339
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){
340
error_t parse_opt (int key, char *arg, struct argp_state *state) {
341
/* Get the INPUT argument from `argp_parse', which we know is a
342
pointer to our plugin list pointer. */
343
plugin **plugins = state->input;
344
switch (key) {
345
case 'g':
346
if (arg != NULL){
382
347
char *p;
383
348
while((p = strsep(&arg, ",")) != NULL){
384
349
if(p[0] == '\0'){
385
350
continue;
386
351
}
387
if(not add_argument(getplugin(NULL), p)){
352
if(not add_argument(getplugin(NULL, plugins), p)){
388
353
perror("add_argument");
389
354
return ARGP_ERR_UNKNOWN;
390
355
}
391
356
}
392
357
}
393
358
break;
394
case 'G': /* --global-env */
359
case 'e':
395
360
if(arg == NULL){
396
361
break;
397
362
}
398
if(not add_environment(getplugin(NULL), arg, true)){
399
perror("add_environment");
363
{
364
char *envdef = strdup(arg);
365
if(envdef == NULL){
366
break;
367
}
368
if(not add_environment(getplugin(NULL, plugins), envdef)){
369
perror("add_environment");
370
}
400
371
}
401
372
break;
402
case 'o': /* --options-for */
403
if(arg != NULL){
373
case 'o':
374
if (arg != NULL){
404
375
char *p_name = strsep(&arg, ":");
405
if(p_name[0] == '\0' or arg == NULL){
376
if(p_name[0] == '\0'){
406
377
break;
407
378
}
408
379
char *opt = strsep(&arg, ":");
409
if(opt[0] == '\0' or opt == NULL){
380
if(opt[0] == '\0'){
410
381
break;
411
382
}
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;
383
if(opt != NULL){
384
char *p;
385
while((p = strsep(&opt, ",")) != NULL){
386
if(p[0] == '\0'){
387
continue;
388
}
389
if(not add_argument(getplugin(p_name, plugins), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
392
}
420
393
}
421
394
}
422
395
}
423
396
break;
424
case 'E': /* --env-for */
397
case 'f':
425
398
if(arg == NULL){
426
399
break;
427
400
}
430
403
if(envdef == NULL){
431
404
break;
432
405
}
433
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
406
char *p_name = strndup(arg, (size_t) (envdef-arg));
407
if(p_name == NULL){
408
break;
409
}
410
envdef++;
411
if(not add_environment(getplugin(p_name, plugins), envdef)){
435
412
perror("add_environment");
436
413
}
437
414
}
438
415
break;
439
case 'd': /* --disable */
440
if(arg != NULL){
441
plugin *p = getplugin(arg);
416
case 'd':
417
if (arg != NULL){
418
plugin *p = getplugin(arg, plugins);
442
419
if(p == NULL){
443
420
return ARGP_ERR_UNKNOWN;
444
421
}
445
422
p->disabled = true;
446
423
}
447
424
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 */
425
case 128:
426
plugindir = arg;
427
break;
428
case 129:
429
uid = (uid_t)strtol(arg, NULL, 10);
430
break;
431
case 130:
432
gid = (gid_t)strtol(arg, NULL, 10);
433
break;
434
case 131:
488
435
debug = true;
489
436
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 = "",
437
case ARGP_KEY_ARG:
438
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
439
break;
440
case ARGP_KEY_END:
441
break;
442
default:
443
return ARGP_ERR_UNKNOWN;
444
}
445
return 0;
446
}
447
448
plugin *plugin_list = NULL;
449
450
struct argp argp = { .options = options, .parser = parse_opt,
451
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
546
452
.doc = "Mandos plugin runner -- Run plugins" };
547
453
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){
454
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
455
if (ret == ARGP_ERR_UNKNOWN){
552
456
fprintf(stderr, "Unknown error while parsing arguments\n");
553
457
exitstatus = EXIT_FAILURE;
554
458
goto fallback;
555
459
}
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
}
460
461
conffp = fopen(argfile, "r");
566
462
if(conffp != NULL){
567
463
char *org_line = NULL;
568
464
char *p, *arg, *new_arg, *line;
569
465
size_t size = 0;
466
ssize_t sret;
570
467
const char whitespace_delims[] = " \r\t\f\v\n";
571
468
const char comment_delim[] = "#";
572
469
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
470
while(true){
586
471
sret = getline(&org_line, &size, conffp);
587
472
if(sret == -1){
595
480
continue;
596
481
}
597
482
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;
483
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
484
if (custom_argv == NULL){
485
perror("add_to_argv");
486
exitstatus = EXIT_FAILURE;
487
goto fallback;
488
}
616
489
}
617
490
}
618
491
free(org_line);
619
} else {
492
} else{
620
493
/* Check for harmful errors and go to fallback. Other errors might
621
494
not affect opening plugins */
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
495
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
496
perror("fopen");
624
497
exitstatus = EXIT_FAILURE;
625
498
goto fallback;
626
499
}
627
500
}
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
501
630
502
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){
503
custom_argv[0] = argv[0];
504
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
505
if (ret == ARGP_ERR_UNKNOWN){
634
506
fprintf(stderr, "Unknown error while parsing arguments\n");
635
507
exitstatus = EXIT_FAILURE;
636
508
goto fallback;
637
509
}
638
510
}
639
511
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
512
if(debug){
650
513
for(plugin *p = plugin_list; p != NULL; p=p->next){
651
514
fprintf(stderr, "Plugin: %s has %d arguments\n",
653
516
for(char **a = p->argv; *a != NULL; a++){
654
517
fprintf(stderr, "\tArg: %s\n", *a);
655
518
}
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
519
fprintf(stderr, "...and %u environment variables\n", p->envc);
657
520
for(char **a = p->environ; *a != NULL; a++){
658
521
fprintf(stderr, "\t%s\n", *a);
659
522
}
660
523
}
661
524
}
662
525
663
/* Strip permissions down to nobody */
664
526
ret = setuid(uid);
665
if(ret == -1){
527
if (ret == -1){
666
528
perror("setuid");
667
}
529
}
530
668
531
setgid(gid);
669
if(ret == -1){
532
if (ret == -1){
670
533
perror("setgid");
671
534
}
672
535
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
677
}
678
536
dir = opendir(plugindir);
679
537
if(dir == NULL){
680
538
perror("Could not open plugin dir");
681
539
exitstatus = EXIT_FAILURE;
697
555
698
556
FD_ZERO(&rfds_all);
699
557
700
/* Read and execute any executable in the plugin directory*/
701
558
while(true){
702
559
dirst = readdir(dir);
703
560
704
/* All directory entries have been processed */
561
// All directory entries have been processed
705
562
if(dirst == NULL){
706
if(errno == EBADF){
563
if (errno == EBADF){
707
564
perror("readdir");
708
565
exitstatus = EXIT_FAILURE;
709
566
goto fallback;
713
570
714
571
d_name_len = strlen(dirst->d_name);
715
572
716
/* Ignore dotfiles, backup files and other junk */
573
// Ignore dotfiles, backup files and other junk
717
574
{
718
575
bool bad_name = false;
719
576
721
578
722
579
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
723
580
".dpkg-old",
724
".dpkg-bak",
725
581
".dpkg-divert", NULL };
726
582
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
727
583
size_t pre_len = strlen(*pre);
735
591
break;
736
592
}
737
593
}
594
738
595
if(bad_name){
739
596
continue;
740
597
}
598
741
599
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
742
600
size_t suf_len = strlen(*suf);
743
601
if((d_name_len >= suf_len)
758
616
}
759
617
760
618
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
}
619
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
620
if(ret < 0){
767
621
perror("asprintf");
768
622
continue;
769
623
}
770
624
771
625
ret = stat(filename, &st);
772
if(ret == -1){
626
if (ret == -1){
773
627
perror("stat");
774
628
free(filename);
775
629
continue;
776
630
}
777
778
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
631
632
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
780
633
if(debug){
781
634
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
782
635
" with bad type or mode\n", filename);
784
637
free(filename);
785
638
continue;
786
639
}
787
788
plugin *p = getplugin(dirst->d_name);
640
plugin *p = getplugin(dirst->d_name, &plugin_list);
789
641
if(p == NULL){
790
642
perror("getplugin");
791
643
free(filename);
801
653
}
802
654
{
803
655
/* Add global arguments to argument list for this plugin */
804
plugin *g = getplugin(NULL);
656
plugin *g = getplugin(NULL, &plugin_list);
805
657
if(g != NULL){
806
658
for(char **a = g->argv + 1; *a != NULL; a++){
807
659
if(not add_argument(p, *a)){
810
662
}
811
663
/* Add global environment variables */
812
664
for(char **e = g->environ; *e != NULL; e++){
813
if(not add_environment(p, *e, false)){
665
if(not add_environment(p, *e)){
814
666
perror("add_environment");
815
667
}
816
668
}
821
673
process, too. */
822
674
if(p->environ[0] != NULL){
823
675
for(char **e = environ; *e != NULL; e++){
824
if(not add_environment(p, *e, false)){
676
char *copy = strdup(*e);
677
if(copy == NULL){
678
perror("strdup");
679
continue;
680
}
681
if(not add_environment(p, copy)){
825
682
perror("add_environment");
826
683
}
827
684
}
829
686
830
687
int pipefd[2];
831
688
ret = pipe(pipefd);
832
if(ret == -1){
689
if (ret == -1){
833
690
perror("pipe");
834
691
exitstatus = EXIT_FAILURE;
835
692
goto fallback;
836
693
}
837
/* Ask OS to automatic close the pipe on exec */
838
694
ret = set_cloexec_flag(pipefd[0]);
839
695
if(ret < 0){
840
696
perror("set_cloexec_flag");
848
704
goto fallback;
849
705
}
850
706
/* Block SIGCHLD until process is safely in process list */
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
707
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
852
708
if(ret < 0){
853
709
perror("sigprocmask");
854
710
exitstatus = EXIT_FAILURE;
855
711
goto fallback;
856
712
}
857
/* Starting a new process to be watched */
713
// Starting a new process to be watched
858
714
pid_t pid = fork();
859
715
if(pid == -1){
860
716
perror("fork");
868
724
perror("sigaction");
869
725
_exit(EXIT_FAILURE);
870
726
}
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
727
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
728
if(ret < 0){
873
729
perror("sigprocmask");
874
730
_exit(EXIT_FAILURE);
875
731
}
876
732
877
733
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
878
734
if(ret == -1){
879
735
perror("dup2");
898
754
}
899
755
/* no return */
900
756
}
901
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
757
/* parent process */
903
758
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);
759
close(pipefd[1]); /* close unused write end of pipe */
760
process *new_process = malloc(sizeof(process));
761
if (new_process == NULL){
762
perror("malloc");
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
908
764
if(ret < 0){
909
perror("sigprocmask");
765
perror("sigprocmask");
910
766
}
911
767
exitstatus = EXIT_FAILURE;
912
768
goto fallback;
913
769
}
914
770
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
917
771
*new_process = (struct process){ .pid = pid,
772
.fd = pipefd[0],
773
.next = process_list };
774
// List handling
775
process_list = new_process;
918
776
/* Unblock SIGCHLD so signal handler can be run if this process
919
777
has already completed */
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
778
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
921
779
if(ret < 0){
922
780
perror("sigprocmask");
923
781
exitstatus = EXIT_FAILURE;
924
782
goto fallback;
925
783
}
926
784
927
FD_SET(new_plugin->fd, &rfds_all);
785
FD_SET(new_process->fd, &rfds_all);
928
786
929
if(maxfd < new_plugin->fd){
930
maxfd = new_plugin->fd;
787
if (maxfd < new_process->fd){
788
maxfd = new_process->fd;
931
789
}
790
932
791
}
933
792
793
free_plugin_list(plugin_list);
794
plugin_list = NULL;
795
934
796
closedir(dir);
935
797
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
}
798
799
if (process_list == NULL){
800
fprintf(stderr, "No plugin processes started. Incorrect plugin"
801
" directory?\n");
802
process_list = NULL;
946
803
}
947
948
/* Main loop while running plugins exist */
949
while(plugin_list){
804
while(process_list){
950
805
fd_set rfds = rfds_all;
951
806
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
952
if(select_ret == -1){
807
if (select_ret == -1){
953
808
perror("select");
954
809
exitstatus = EXIT_FAILURE;
955
810
goto fallback;
956
811
}
957
812
/* OK, now either a process completed, or something can be read
958
813
from one of them */
959
for(plugin *proc = plugin_list; proc != NULL;){
814
for(process *proc = process_list; proc ; proc = proc->next){
960
815
/* Is this process completely done? */
961
816
if(proc->eof and proc->completed){
962
817
/* Only accept the plugin output if it exited cleanly */
963
818
if(not WIFEXITED(proc->status)
964
819
or WEXITSTATUS(proc->status) != 0){
965
820
/* Bad exit by plugin */
966
967
821
if(debug){
968
822
if(WIFEXITED(proc->status)){
969
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
970
" %d\n", (intmax_t) (proc->pid),
823
fprintf(stderr, "Plugin %u exited with status %d\n",
824
(unsigned int) (proc->pid),
971
825
WEXITSTATUS(proc->status));
972
826
} else if(WIFSIGNALED(proc->status)) {
973
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
974
" %d\n", (intmax_t) (proc->pid),
827
fprintf(stderr, "Plugin %u killed by signal %d\n",
828
(unsigned int) (proc->pid),
975
829
WTERMSIG(proc->status));
976
830
} else if(WCOREDUMP(proc->status)){
977
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
978
(intmax_t) (proc->pid));
831
fprintf(stderr, "Plugin %d dumped core\n",
832
(unsigned int) (proc->pid));
979
833
}
980
834
}
981
982
835
/* Remove the plugin */
983
836
FD_CLR(proc->fd, &rfds_all);
984
985
837
/* Block signal while modifying process_list */
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
838
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
987
839
if(ret < 0){
988
840
perror("sigprocmask");
989
841
exitstatus = EXIT_FAILURE;
990
842
goto fallback;
991
843
}
992
993
plugin *next_plugin = proc->next;
994
free_plugin(proc);
995
proc = next_plugin;
996
844
/* Delete this process entry from the list */
845
if(process_list == proc){
846
/* First one - simple */
847
process_list = proc->next;
848
} else {
849
/* Second one or later */
850
for(process *p = process_list; p != NULL; p = p->next){
851
if(p->next == proc){
852
p->next = proc->next;
853
break;
854
}
855
}
856
}
997
857
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
858
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
859
NULL);
1000
860
if(ret < 0){
1001
861
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1003
goto fallback;
1004
}
1005
1006
if(plugin_list == NULL){
1007
break;
1008
}
1009
1010
continue;
862
}
863
free(proc->buffer);
864
free(proc);
865
/* We deleted this process from the list, so we can't go
866
proc->next. Therefore, start over from the beginning of
867
the process list */
868
break;
1011
869
}
1012
1013
870
/* This process exited nicely, so print its buffer */
1014
1015
bool bret = print_out_password(proc->buffer,
1016
proc->buffer_length);
871
872
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1017
873
if(not bret){
1018
874
perror("print_out_password");
1019
875
exitstatus = EXIT_FAILURE;
1020
876
}
1021
877
goto fallback;
1022
878
}
1023
1024
879
/* This process has not completed. Does it have any output? */
1025
880
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1026
881
/* This process had nothing to say at this time */
1027
proc = proc->next;
1028
882
continue;
1029
883
}
1030
884
/* Before reading, make the process' data buffer large enough */
1031
885
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1032
886
proc->buffer = realloc(proc->buffer, proc->buffer_size
1033
887
+ (size_t) BUFFER_SIZE);
1034
if(proc->buffer == NULL){
888
if (proc->buffer == NULL){
1035
889
perror("malloc");
1036
890
exitstatus = EXIT_FAILURE;
1037
891
goto fallback;
1039
893
proc->buffer_size += BUFFER_SIZE;
1040
894
}
1041
895
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1044
if(sret < 0){
896
ret = read(proc->fd, proc->buffer + proc->buffer_length,
897
BUFFER_SIZE);
898
if(ret < 0){
1045
899
/* Read error from this process; ignore the error */
1046
proc = proc->next;
1047
900
continue;
1048
901
}
1049
if(sret == 0){
902
if(ret == 0){
1050
903
/* got EOF */
1051
904
proc->eof = true;
1052
905
} else {
1053
proc->buffer_length += (size_t) sret;
906
proc->buffer_length += (size_t) ret;
1054
907
}
1055
908
}
1056
909
}
1058
911
1059
912
fallback:
1060
913
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1062
/* Fallback if all plugins failed, none are found or an error
1063
occured */
914
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
915
/* Fallback if all plugins failed, none are found or an error occured */
1064
916
bool bret;
1065
917
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1066
918
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);
919
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1074
920
if(not bret){
1075
921
perror("print_out_password");
1076
922
exitstatus = EXIT_FAILURE;
1083
929
perror("sigaction");
1084
930
exitstatus = EXIT_FAILURE;
1085
931
}
1086
932
1087
933
if(custom_argv != NULL){
1088
for(char **arg = custom_argv+1; *arg != NULL; arg++){
934
for(char **arg = custom_argv; *arg != NULL; arg++){
1089
935
free(*arg);
1090
936
}
1091
937
free(custom_argv);
1092
938
}
939
free_plugin_list(plugin_list);
1093
940
1094
941
if(dir != NULL){
1095
942
closedir(dir);
1096
943
}
1097
944
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
}
945
/* Free the process list and kill the processes */
946
for(process *next; process_list != NULL; process_list = next){
947
next = process_list->next;
948
close(process_list->fd);
949
ret = kill(process_list->pid, SIGTERM);
950
if(ret == -1 and errno != ESRCH){
951
/* set-uid proccesses migth not get closed */
952
perror("kill");
1107
953
}
954
free(process_list->buffer);
955
free(process_list);
1108
956
}
1109
957
1110
958
/* Wait for any remaining child processes to terminate */
1115
963
perror("wait");
1116
964
}
1117
965
1118
free_plugin_list();
1119
1120
free(plugindir);
1121
free(argfile);
1122
1123
966
return exitstatus;
1124
967
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0