To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 107
- compare with another revision
- download diff
- download tarball
- view history from revision 107
- Committer: Teddy Hogeborn
- Date: 2008-08-25 09:09:15 UTC
- mfrom: (24.1.71 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080825090915-dxlxgb4pw1kqsui5
Merge.
- 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
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
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
23
22
*/
24
23
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
25
asprintf() */
27
26
#include <stddef.h> /* size_t, NULL */
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 */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
36
35
uid_t, gid_t, getuid(), getgid(),
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
40
WEXITSTATUS() */
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
44
readdir(), closedir(), dirfd() */
47
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
53
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
53
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
SIG_UNBLOCK, kill() */
69
65
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
66
72
67
#define BUFFER_SIZE 256
73
68
74
69
#define PDIR "/lib/mandos/plugins.d"
75
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
76
71
77
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
78
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
79
74
75
struct process;
76
77
typedef struct process{
78
pid_t pid;
79
int fd;
80
char *buffer;
81
size_t buffer_size;
82
size_t buffer_length;
83
bool eof;
84
volatile bool completed;
85
volatile int status;
86
struct process *next;
87
} process;
88
80
89
typedef struct plugin{
81
90
char *name; /* can be NULL or any plugin name */
82
91
char **argv;
84
93
char **environ;
85
94
int envc;
86
95
bool disabled;
87
88
/* Variables used for running processes*/
89
pid_t pid;
90
int fd;
91
char *buffer;
92
size_t buffer_size;
93
size_t buffer_length;
94
bool eof;
95
volatile sig_atomic_t completed;
96
int status;
97
96
struct plugin *next;
98
97
} plugin;
99
98
100
static plugin *plugin_list = NULL;
101
102
/* Gets an existing plugin based on name,
103
or if none is found, creates a new one */
104
static plugin *getplugin(char *name){
105
/* Check for exiting plugin with that name */
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
107
if((p->name == name)
108
or (p->name and name and (strcmp(p->name, name) == 0))){
99
static plugin *getplugin(char *name, plugin **plugin_list){
100
for (plugin *p = *plugin_list; p != NULL; p = p->next){
101
if ((p->name == name)
102
or (p->name and name and (strcmp(p->name, name) == 0))){
109
103
return p;
110
104
}
111
105
}
112
106
/* Create a new plugin */
113
plugin *new_plugin = NULL;
114
do {
115
new_plugin = malloc(sizeof(plugin));
116
} while(new_plugin == NULL and errno == EINTR);
117
if(new_plugin == NULL){
107
plugin *new_plugin = malloc(sizeof(plugin));
108
if (new_plugin == NULL){
118
109
return NULL;
119
110
}
120
111
char *copy_name = NULL;
121
112
if(name != NULL){
122
do {
123
copy_name = strdup(name);
124
} while(copy_name == NULL and errno == EINTR);
113
copy_name = strdup(name);
125
114
if(copy_name == NULL){
126
free(new_plugin);
127
115
return NULL;
128
116
}
129
117
}
130
118
131
*new_plugin = (plugin){ .name = copy_name,
132
.argc = 1,
133
.disabled = false,
134
.next = plugin_list };
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
135
124
136
do {
137
new_plugin->argv = malloc(sizeof(char *) * 2);
138
} while(new_plugin->argv == NULL and errno == EINTR);
139
if(new_plugin->argv == NULL){
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
140
127
free(copy_name);
141
128
free(new_plugin);
142
129
return NULL;
143
130
}
144
131
new_plugin->argv[0] = copy_name;
145
132
new_plugin->argv[1] = NULL;
146
147
do {
148
new_plugin->environ = malloc(sizeof(char *));
149
} while(new_plugin->environ == NULL and errno == EINTR);
133
134
new_plugin->environ = malloc(sizeof(char *));
150
135
if(new_plugin->environ == NULL){
151
136
free(copy_name);
152
137
free(new_plugin->argv);
154
139
return NULL;
155
140
}
156
141
new_plugin->environ[0] = NULL;
157
158
142
/* Append the new plugin to the list */
159
plugin_list = new_plugin;
143
*plugin_list = new_plugin;
160
144
return new_plugin;
161
145
}
162
146
164
148
static bool add_to_char_array(const char *new, char ***array,
165
149
int *len){
166
150
/* Resize the pointed-to array to hold one more pointer */
167
do {
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
151
*array = realloc(*array, sizeof(char *)
152
* (size_t) ((*len) + 2));
171
153
/* Malloc check */
172
154
if(*array == NULL){
173
155
return false;
174
156
}
175
157
/* Make a copy of the new string */
176
char *copy;
177
do {
178
copy = strdup(new);
179
} while(copy == NULL and errno == EINTR);
158
char *copy = strdup(new);
180
159
if(copy == NULL){
181
160
return false;
182
161
}
197
176
}
198
177
199
178
/* Add to a plugin's environment */
200
static bool add_environment(plugin *p, const char *def, bool replace){
179
static bool add_environment(plugin *p, const char *def){
201
180
if(p == NULL){
202
181
return false;
203
182
}
204
/* namelen = length of name of environment variable */
205
size_t namelen = (size_t)(strchrnul(def, '=') - def);
206
/* Search for this environment variable */
207
for(char **e = p->environ; *e != NULL; e++){
208
if(strncmp(*e, def, namelen + 1) == 0){
209
/* It already exists */
210
if(replace){
211
char *new;
212
do {
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
215
if(new == NULL){
216
return false;
217
}
218
*e = new;
219
strcpy(*e, def);
220
}
221
return true;
222
}
223
}
224
183
return add_to_char_array(def, &(p->environ), &(p->envc));
225
184
}
226
185
186
227
187
/*
228
188
* Based on the example in the GNU LibC manual chapter 13.13 "File
229
189
* Descriptor Flags".
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
231
191
*/
232
static int set_cloexec_flag(int fd){
233
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
192
static int set_cloexec_flag(int fd)
193
{
194
int ret = fcntl(fd, F_GETFD, 0);
234
195
/* If reading the flags failed, return error indication now. */
235
196
if(ret < 0){
236
197
return ret;
237
198
}
238
199
/* Store modified flag word in the descriptor. */
239
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
240
ret | FD_CLOEXEC));
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
241
201
}
242
202
203
process *process_list = NULL;
243
204
244
205
/* Mark processes as completed when they exit, and save their exit
245
206
status. */
246
static void handle_sigchld(__attribute__((unused)) int sig){
247
int old_errno = errno;
207
void handle_sigchld(__attribute__((unused)) int sig){
248
208
while(true){
249
plugin *proc = plugin_list;
209
process *proc = process_list;
250
210
int status;
251
211
pid_t pid = waitpid(-1, &status, WNOHANG);
252
212
if(pid == 0){
254
214
break;
255
215
}
256
216
if(pid == -1){
257
if(errno == ECHILD){
258
/* No child processes */
259
break;
217
if (errno != ECHILD){
218
perror("waitpid");
260
219
}
261
perror("waitpid");
220
/* No child processes */
221
break;
262
222
}
263
223
264
224
/* A child exited, find it in process_list */
265
225
while(proc != NULL and proc->pid != pid){
266
226
proc = proc->next;
270
230
continue;
271
231
}
272
232
proc->status = status;
273
proc->completed = 1;
233
proc->completed = true;
274
234
}
275
errno = old_errno;
276
235
}
277
236
278
/* Prints out a password to stdout */
279
static bool print_out_password(const char *buffer, size_t length){
237
bool print_out_password(const char *buffer, size_t length){
280
238
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
281
242
for(size_t written = 0; written < length; written += (size_t)ret){
282
243
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
283
244
length - written));
288
249
return true;
289
250
}
290
251
291
/* Removes and free a plugin from the plugin list */
292
static void free_plugin(plugin *plugin_node){
293
294
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
295
free(*arg);
296
}
297
free(plugin_node->argv);
298
for(char **env = plugin_node->environ; *env != NULL; env++){
299
free(*env);
300
}
301
free(plugin_node->environ);
302
free(plugin_node->buffer);
303
304
/* Removes the plugin from the singly-linked list */
305
if(plugin_node == plugin_list){
306
/* First one - simple */
307
plugin_list = plugin_list->next;
308
} else {
309
/* Second one or later */
310
for(plugin *p = plugin_list; p != NULL; p = p->next){
311
if(p->next == plugin_node){
312
p->next = plugin_node->next;
313
break;
314
}
315
}
316
}
317
318
free(plugin_node);
319
}
320
321
static void free_plugin_list(void){
322
while(plugin_list != NULL){
323
free_plugin(plugin_list);
252
static void free_plugin_list(plugin *plugin_list){
253
for(plugin *next; plugin_list != NULL; plugin_list = next){
254
next = plugin_list->next;
255
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
256
free(*arg);
257
}
258
free(plugin_list->argv);
259
for(char **env = plugin_list->environ; *env != NULL; env++){
260
free(*env);
261
}
262
free(plugin_list->environ);
263
free(plugin_list);
324
264
}
325
265
}
326
266
334
274
struct stat st;
335
275
fd_set rfds_all;
336
276
int ret, maxfd = 0;
337
ssize_t sret;
338
277
uid_t uid = 65534;
339
278
gid_t gid = 65534;
340
279
bool debug = false;
365
304
{ .name = "global-options", .key = 'g',
366
305
.arg = "OPTION[,OPTION[,...]]",
367
306
.doc = "Options passed to all plugins" },
368
{ .name = "global-env", .key = 'G',
307
{ .name = "global-envs", .key = 'e',
369
308
.arg = "VAR=value",
370
309
.doc = "Environment variable passed to all plugins" },
371
310
{ .name = "options-for", .key = 'o',
372
311
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
373
312
.doc = "Options passed only to specified plugin" },
374
{ .name = "env-for", .key = 'E',
313
{ .name = "envs-for", .key = 'f',
375
314
.arg = "PLUGIN:ENV=value",
376
315
.doc = "Environment variable passed to specified plugin" },
377
316
{ .name = "disable", .key = 'd',
378
317
.arg = "PLUGIN",
379
318
.doc = "Disable a specific plugin", .group = 1 },
380
{ .name = "enable", .key = 'e',
381
.arg = "PLUGIN",
382
.doc = "Enable a specific plugin", .group = 1 },
383
319
{ .name = "plugin-dir", .key = 128,
384
320
.arg = "DIRECTORY",
385
321
.doc = "Specify a different plugin directory", .group = 2 },
397
333
{ .name = NULL }
398
334
};
399
335
400
error_t parse_opt(int key, char *arg, __attribute__((unused))
401
struct argp_state *state){
402
switch(key){
403
char *tmp;
404
intmax_t tmpmax;
405
case 'g': /* --global-options */
406
if(arg != NULL){
407
char *plugin_option;
408
while((plugin_option = strsep(&arg, ",")) != NULL){
409
if(plugin_option[0] == '\0'){
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
340
switch (key) {
341
case 'g':
342
if (arg != NULL){
343
char *p;
344
while((p = strsep(&arg, ",")) != NULL){
345
if(p[0] == '\0'){
410
346
continue;
411
347
}
412
if(not add_argument(getplugin(NULL), plugin_option)){
348
if(not add_argument(getplugin(NULL, plugins), p)){
413
349
perror("add_argument");
414
350
return ARGP_ERR_UNKNOWN;
415
351
}
416
352
}
417
353
}
418
354
break;
419
case 'G': /* --global-env */
355
case 'e':
420
356
if(arg == NULL){
421
357
break;
422
358
}
423
if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
425
367
}
426
368
break;
427
case 'o': /* --options-for */
428
if(arg != NULL){
429
char *plugin_name = strsep(&arg, ":");
430
if(plugin_name[0] == '\0'){
431
break;
432
}
433
char *plugin_option;
434
while((plugin_option = strsep(&arg, ",")) != NULL){
435
if(not add_argument(getplugin(plugin_name), plugin_option)){
436
perror("add_argument");
437
return ARGP_ERR_UNKNOWN;
369
case 'o':
370
if (arg != NULL){
371
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
373
break;
374
}
375
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
377
break;
378
}
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
438
389
}
439
390
}
440
391
}
441
392
break;
442
case 'E': /* --env-for */
393
case 'f':
443
394
if(arg == NULL){
444
395
break;
445
396
}
448
399
if(envdef == NULL){
449
400
break;
450
401
}
451
*envdef = '\0';
452
if(not add_environment(getplugin(arg), envdef+1, true)){
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
406
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
453
408
perror("add_environment");
454
409
}
455
410
}
456
411
break;
457
case 'd': /* --disable */
458
if(arg != NULL){
459
plugin *p = getplugin(arg);
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
460
415
if(p == NULL){
461
416
return ARGP_ERR_UNKNOWN;
462
417
}
463
418
p->disabled = true;
464
419
}
465
420
break;
466
case 'e': /* --enable */
467
if(arg != NULL){
468
plugin *p = getplugin(arg);
469
if(p == NULL){
470
return ARGP_ERR_UNKNOWN;
471
}
472
p->disabled = false;
473
}
474
break;
475
case 128: /* --plugin-dir */
476
free(plugindir);
421
case 128:
477
422
plugindir = strdup(arg);
478
423
if(plugindir == NULL){
479
424
perror("strdup");
480
}
481
break;
482
case 129: /* --config-file */
483
/* This is already done by parse_opt_config_file() */
484
break;
485
case 130: /* --userid */
486
errno = 0;
487
tmpmax = strtoimax(arg, &tmp, 10);
488
if(errno != 0 or tmp == arg or *tmp != '\0'
489
or tmpmax != (uid_t)tmpmax){
490
fprintf(stderr, "Bad user ID number: \"%s\", using %"
491
PRIdMAX "\n", arg, (intmax_t)uid);
492
} else {
493
uid = (uid_t)tmpmax;
494
}
495
break;
496
case 131: /* --groupid */
497
errno = 0;
498
tmpmax = strtoimax(arg, &tmp, 10);
499
if(errno != 0 or tmp == arg or *tmp != '\0'
500
or tmpmax != (gid_t)tmpmax){
501
fprintf(stderr, "Bad group ID number: \"%s\", using %"
502
PRIdMAX "\n", arg, (intmax_t)gid);
503
} else {
504
gid = (gid_t)tmpmax;
505
}
506
break;
507
case 132: /* --debug */
508
debug = true;
509
break;
510
/*
511
* When adding more options before this line, remember to also add a
512
* "case" to the "parse_opt_config_file" function below.
513
*/
514
case ARGP_KEY_ARG:
515
/* Cryptsetup always passes an argument, which is an empty
516
string if "none" was specified in /etc/crypttab. So if
517
argument was empty, we ignore it silently. */
518
if(arg[0] != '\0'){
519
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
520
}
521
break;
522
case ARGP_KEY_END:
523
break;
524
default:
525
return ARGP_ERR_UNKNOWN;
526
}
527
return 0;
528
}
529
530
/* This option parser is the same as parse_opt() above, except it
531
ignores everything but the --config-file option. */
532
error_t parse_opt_config_file(int key, char *arg,
533
__attribute__((unused))
534
struct argp_state *state){
535
switch(key){
536
case 'g': /* --global-options */
537
case 'G': /* --global-env */
538
case 'o': /* --options-for */
539
case 'E': /* --env-for */
540
case 'd': /* --disable */
541
case 'e': /* --enable */
542
case 128: /* --plugin-dir */
543
break;
544
case 129: /* --config-file */
545
free(argfile);
425
}
426
break;
427
case 129:
546
428
argfile = strdup(arg);
547
429
if(argfile == NULL){
548
430
perror("strdup");
549
431
}
550
break;
551
case 130: /* --userid */
552
case 131: /* --groupid */
553
case 132: /* --debug */
432
break;
433
case 130:
434
uid = (uid_t)strtol(arg, NULL, 10);
435
break;
436
case 131:
437
gid = (gid_t)strtol(arg, NULL, 10);
438
break;
439
case 132:
440
debug = true;
441
break;
554
442
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
555
445
case ARGP_KEY_END:
556
446
break;
557
447
default:
560
450
return 0;
561
451
}
562
452
563
struct argp argp = { .options = options,
564
.parser = parse_opt_config_file,
565
.args_doc = "",
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
566
457
.doc = "Mandos plugin runner -- Run plugins" };
567
458
568
/* Parse using parse_opt_config_file() in order to get the custom
569
config file location, if any. */
570
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
571
if(ret == ARGP_ERR_UNKNOWN){
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
572
461
fprintf(stderr, "Unknown error while parsing arguments\n");
573
462
exitstatus = EXIT_FAILURE;
574
463
goto fallback;
575
464
}
576
577
/* Reset to the normal argument parser */
578
argp.parser = parse_opt;
579
580
/* Open the configfile if available */
581
if(argfile == NULL){
465
466
if (argfile == NULL){
582
467
conffp = fopen(AFILE, "r");
583
468
} else {
584
469
conffp = fopen(argfile, "r");
585
470
}
471
586
472
if(conffp != NULL){
587
473
char *org_line = NULL;
588
474
char *p, *arg, *new_arg, *line;
589
475
size_t size = 0;
476
ssize_t sret;
590
477
const char whitespace_delims[] = " \r\t\f\v\n";
591
478
const char comment_delim[] = "#";
592
479
593
480
custom_argc = 1;
594
481
custom_argv = malloc(sizeof(char*) * 2);
595
482
if(custom_argv == NULL){
600
487
custom_argv[0] = argv[0];
601
488
custom_argv[1] = NULL;
602
489
603
/* for each line in the config file, strip whitespace and ignore
604
commented text */
605
490
while(true){
606
491
sret = getline(&org_line, &size, conffp);
607
492
if(sret == -1){
608
493
break;
609
494
}
610
495
611
496
line = org_line;
612
497
arg = strsep(&line, comment_delim);
613
498
while((p = strsep(&arg, whitespace_delims)) != NULL){
632
517
goto fallback;
633
518
}
634
519
custom_argv[custom_argc-1] = new_arg;
635
custom_argv[custom_argc] = NULL;
520
custom_argv[custom_argc] = NULL;
636
521
}
637
522
}
638
do {
639
ret = fclose(conffp);
640
} while(ret == EOF and errno == EINTR);
641
if(ret == EOF){
642
perror("fclose");
643
exitstatus = EXIT_FAILURE;
644
goto fallback;
645
}
646
523
free(org_line);
647
} else {
524
} else{
648
525
/* Check for harmful errors and go to fallback. Other errors might
649
526
not affect opening plugins */
650
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
651
528
perror("fopen");
652
529
exitstatus = EXIT_FAILURE;
653
530
goto fallback;
654
531
}
655
532
}
656
/* If there was any arguments from configuration file,
657
pass them to parser as command arguments */
533
658
534
if(custom_argv != NULL){
659
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
660
0, NULL);
661
if(ret == ARGP_ERR_UNKNOWN){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
662
537
fprintf(stderr, "Unknown error while parsing arguments\n");
663
538
exitstatus = EXIT_FAILURE;
664
539
goto fallback;
665
540
}
666
541
}
667
542
668
/* Parse actual command line arguments, to let them override the
669
config file */
670
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
671
if(ret == ARGP_ERR_UNKNOWN){
672
fprintf(stderr, "Unknown error while parsing arguments\n");
673
exitstatus = EXIT_FAILURE;
674
goto fallback;
675
}
676
677
543
if(debug){
678
544
for(plugin *p = plugin_list; p != NULL; p=p->next){
679
545
fprintf(stderr, "Plugin: %s has %d arguments\n",
681
547
for(char **a = p->argv; *a != NULL; a++){
682
548
fprintf(stderr, "\tArg: %s\n", *a);
683
549
}
684
fprintf(stderr, "...and %d environment variables\n", p->envc);
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
685
551
for(char **a = p->environ; *a != NULL; a++){
686
552
fprintf(stderr, "\t%s\n", *a);
687
553
}
688
554
}
689
555
}
690
556
691
/* Strip permissions down to nobody */
557
ret = setuid(uid);
558
if (ret == -1){
559
perror("setuid");
560
}
561
692
562
setgid(gid);
693
if(ret == -1){
563
if (ret == -1){
694
564
perror("setgid");
695
565
}
696
ret = setuid(uid);
697
if(ret == -1){
698
perror("setuid");
699
}
700
701
/* Open plugin directory with close_on_exec flag */
566
567
if (plugindir == NULL){
568
dir = opendir(PDIR);
569
} else {
570
dir = opendir(plugindir);
571
}
572
573
if(dir == NULL){
574
perror("Could not open plugin dir");
575
exitstatus = EXIT_FAILURE;
576
goto fallback;
577
}
578
579
/* Set the FD_CLOEXEC flag on the directory, if possible */
702
580
{
703
int dir_fd = -1;
704
if(plugindir == NULL){
705
dir_fd = open(PDIR, O_RDONLY |
706
#ifdef O_CLOEXEC
707
O_CLOEXEC
708
#else /* not O_CLOEXEC */
709
0
710
#endif /* not O_CLOEXEC */
711
);
712
} else {
713
dir_fd = open(plugindir, O_RDONLY |
714
#ifdef O_CLOEXEC
715
O_CLOEXEC
716
#else /* not O_CLOEXEC */
717
0
718
#endif /* not O_CLOEXEC */
719
);
720
}
721
if(dir_fd == -1){
722
perror("Could not open plugin dir");
723
exitstatus = EXIT_FAILURE;
724
goto fallback;
725
}
726
727
#ifndef O_CLOEXEC
728
/* Set the FD_CLOEXEC flag on the directory */
729
ret = set_cloexec_flag(dir_fd);
730
if(ret < 0){
731
perror("set_cloexec_flag");
732
TEMP_FAILURE_RETRY(close(dir_fd));
733
exitstatus = EXIT_FAILURE;
734
goto fallback;
735
}
736
#endif /* O_CLOEXEC */
737
738
dir = fdopendir(dir_fd);
739
if(dir == NULL){
740
perror("Could not open plugin dir");
741
TEMP_FAILURE_RETRY(close(dir_fd));
742
exitstatus = EXIT_FAILURE;
743
goto fallback;
581
int dir_fd = dirfd(dir);
582
if(dir_fd >= 0){
583
ret = set_cloexec_flag(dir_fd);
584
if(ret < 0){
585
perror("set_cloexec_flag");
586
exitstatus = EXIT_FAILURE;
587
goto fallback;
588
}
744
589
}
745
590
}
746
591
747
592
FD_ZERO(&rfds_all);
748
593
749
/* Read and execute any executable in the plugin directory*/
750
594
while(true){
751
do {
752
dirst = readdir(dir);
753
} while(dirst == NULL and errno == EINTR);
595
dirst = readdir(dir);
754
596
755
/* All directory entries have been processed */
597
// All directory entries have been processed
756
598
if(dirst == NULL){
757
if(errno == EBADF){
599
if (errno == EBADF){
758
600
perror("readdir");
759
601
exitstatus = EXIT_FAILURE;
760
602
goto fallback;
764
606
765
607
d_name_len = strlen(dirst->d_name);
766
608
767
/* Ignore dotfiles, backup files and other junk */
609
// Ignore dotfiles, backup files and other junk
768
610
{
769
611
bool bad_name = false;
770
612
772
614
773
615
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
774
616
".dpkg-old",
775
".dpkg-bak",
776
617
".dpkg-divert", NULL };
777
618
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
778
619
size_t pre_len = strlen(*pre);
786
627
break;
787
628
}
788
629
}
630
789
631
if(bad_name){
790
632
continue;
791
633
}
634
792
635
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
793
636
size_t suf_len = strlen(*suf);
794
637
if((d_name_len >= suf_len)
807
650
continue;
808
651
}
809
652
}
810
653
811
654
char *filename;
812
if(plugindir == NULL){
813
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
814
dirst->d_name));
815
} else {
816
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
817
plugindir,
818
dirst->d_name));
819
}
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
820
656
if(ret < 0){
821
657
perror("asprintf");
822
658
continue;
823
659
}
824
660
825
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
826
if(ret == -1){
661
ret = stat(filename, &st);
662
if (ret == -1){
827
663
perror("stat");
828
664
free(filename);
829
665
continue;
830
666
}
831
667
832
/* Ignore non-executable files */
833
if(not S_ISREG(st.st_mode)
834
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
835
669
if(debug){
836
670
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
837
671
" with bad type or mode\n", filename);
839
673
free(filename);
840
674
continue;
841
675
}
842
843
plugin *p = getplugin(dirst->d_name);
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
844
677
if(p == NULL){
845
678
perror("getplugin");
846
679
free(filename);
856
689
}
857
690
{
858
691
/* Add global arguments to argument list for this plugin */
859
plugin *g = getplugin(NULL);
692
plugin *g = getplugin(NULL, &plugin_list);
860
693
if(g != NULL){
861
694
for(char **a = g->argv + 1; *a != NULL; a++){
862
695
if(not add_argument(p, *a)){
865
698
}
866
699
/* Add global environment variables */
867
700
for(char **e = g->environ; *e != NULL; e++){
868
if(not add_environment(p, *e, false)){
701
if(not add_environment(p, *e)){
869
702
perror("add_environment");
870
703
}
871
704
}
876
709
process, too. */
877
710
if(p->environ[0] != NULL){
878
711
for(char **e = environ; *e != NULL; e++){
879
if(not add_environment(p, *e, false)){
712
char *copy = strdup(*e);
713
if(copy == NULL){
714
perror("strdup");
715
continue;
716
}
717
if(not add_environment(p, copy)){
880
718
perror("add_environment");
881
719
}
882
720
}
883
721
}
884
722
885
723
int pipefd[2];
886
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
887
if(ret == -1){
724
ret = pipe(pipefd);
725
if (ret == -1){
888
726
perror("pipe");
889
727
exitstatus = EXIT_FAILURE;
890
728
goto fallback;
891
729
}
892
/* Ask OS to automatic close the pipe on exec */
893
730
ret = set_cloexec_flag(pipefd[0]);
894
731
if(ret < 0){
895
732
perror("set_cloexec_flag");
903
740
goto fallback;
904
741
}
905
742
/* Block SIGCHLD until process is safely in process list */
906
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
907
&sigchld_action.sa_mask,
908
NULL));
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
909
744
if(ret < 0){
910
745
perror("sigprocmask");
911
746
exitstatus = EXIT_FAILURE;
912
747
goto fallback;
913
748
}
914
/* Starting a new process to be watched */
915
pid_t pid;
916
do {
917
pid = fork();
918
} while(pid == -1 and errno == EINTR);
749
// Starting a new process to be watched
750
pid_t pid = fork();
919
751
if(pid == -1){
920
752
perror("fork");
921
753
exitstatus = EXIT_FAILURE;
928
760
perror("sigaction");
929
761
_exit(EXIT_FAILURE);
930
762
}
931
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
932
764
if(ret < 0){
933
765
perror("sigprocmask");
934
766
_exit(EXIT_FAILURE);
935
767
}
936
768
937
769
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
938
770
if(ret == -1){
939
771
perror("dup2");
958
790
}
959
791
/* no return */
960
792
}
961
/* Parent process */
962
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
963
pipe */
793
/* parent process */
964
794
free(filename);
965
plugin *new_plugin = getplugin(dirst->d_name);
966
if(new_plugin == NULL){
967
perror("getplugin");
968
ret = (int)(TEMP_FAILURE_RETRY
969
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
970
NULL)));
795
close(pipefd[1]); /* close unused write end of pipe */
796
process *new_process = malloc(sizeof(process));
797
if (new_process == NULL){
798
perror("malloc");
799
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
971
800
if(ret < 0){
972
perror("sigprocmask");
801
perror("sigprocmask");
973
802
}
974
803
exitstatus = EXIT_FAILURE;
975
804
goto fallback;
976
805
}
977
806
978
new_plugin->pid = pid;
979
new_plugin->fd = pipefd[0];
980
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
981
812
/* Unblock SIGCHLD so signal handler can be run if this process
982
813
has already completed */
983
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
984
&sigchld_action.sa_mask,
985
NULL));
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
986
815
if(ret < 0){
987
816
perror("sigprocmask");
988
817
exitstatus = EXIT_FAILURE;
989
818
goto fallback;
990
819
}
991
820
992
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
993
-Wconversion */
821
FD_SET(new_process->fd, &rfds_all);
994
822
995
if(maxfd < new_plugin->fd){
996
maxfd = new_plugin->fd;
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
997
825
}
826
998
827
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
999
831
1000
TEMP_FAILURE_RETRY(closedir(dir));
832
closedir(dir);
1001
833
dir = NULL;
1002
free_plugin(getplugin(NULL));
1003
1004
for(plugin *p = plugin_list; p != NULL; p = p->next){
1005
if(p->pid != 0){
1006
break;
1007
}
1008
if(p->next == NULL){
1009
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1010
" directory?\n");
1011
free_plugin_list();
1012
}
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
1013
839
}
1014
1015
/* Main loop while running plugins exist */
1016
while(plugin_list){
840
while(process_list){
1017
841
fd_set rfds = rfds_all;
1018
842
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1019
if(select_ret == -1 and errno != EINTR){
843
if (select_ret == -1){
1020
844
perror("select");
1021
845
exitstatus = EXIT_FAILURE;
1022
846
goto fallback;
1023
847
}
1024
848
/* OK, now either a process completed, or something can be read
1025
849
from one of them */
1026
for(plugin *proc = plugin_list; proc != NULL;){
850
for(process *proc = process_list; proc ; proc = proc->next){
1027
851
/* Is this process completely done? */
1028
if(proc->completed and proc->eof){
852
if(proc->eof and proc->completed){
1029
853
/* Only accept the plugin output if it exited cleanly */
1030
854
if(not WIFEXITED(proc->status)
1031
855
or WEXITSTATUS(proc->status) != 0){
1032
856
/* Bad exit by plugin */
1033
1034
857
if(debug){
1035
858
if(WIFEXITED(proc->status)){
1036
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1037
" status %d\n", proc->name,
1038
(intmax_t) (proc->pid),
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
1039
861
WEXITSTATUS(proc->status));
1040
} else if(WIFSIGNALED(proc->status)){
1041
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1042
" signal %d: %s\n", proc->name,
1043
(intmax_t) (proc->pid),
1044
WTERMSIG(proc->status),
1045
strsignal(WTERMSIG(proc->status)));
862
} else if(WIFSIGNALED(proc->status)) {
863
fprintf(stderr, "Plugin %u killed by signal %d\n",
864
(unsigned int) (proc->pid),
865
WTERMSIG(proc->status));
1046
866
} else if(WCOREDUMP(proc->status)){
1047
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1048
" core\n", proc->name, (intmax_t) (proc->pid));
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
1049
869
}
1050
870
}
1051
1052
871
/* Remove the plugin */
1053
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1054
-Wconversion */
1055
872
FD_CLR(proc->fd, &rfds_all);
1056
873
/* Block signal while modifying process_list */
1057
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1058
(SIG_BLOCK,
1059
&sigchld_action.sa_mask,
1060
NULL));
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1061
875
if(ret < 0){
1062
876
perror("sigprocmask");
1063
877
exitstatus = EXIT_FAILURE;
1064
878
goto fallback;
1065
879
}
1066
1067
plugin *next_plugin = proc->next;
1068
free_plugin(proc);
1069
proc = next_plugin;
1070
880
/* Delete this process entry from the list */
881
if(process_list == proc){
882
/* First one - simple */
883
process_list = proc->next;
884
} else {
885
/* Second one or later */
886
for(process *p = process_list; p != NULL; p = p->next){
887
if(p->next == proc){
888
p->next = proc->next;
889
break;
890
}
891
}
892
}
1071
893
/* We are done modifying process list, so unblock signal */
1072
ret = (int)(TEMP_FAILURE_RETRY
1073
(sigprocmask(SIG_UNBLOCK,
1074
&sigchld_action.sa_mask, NULL)));
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1075
896
if(ret < 0){
1076
897
perror("sigprocmask");
1077
exitstatus = EXIT_FAILURE;
1078
goto fallback;
1079
}
1080
1081
if(plugin_list == NULL){
1082
break;
1083
}
1084
1085
continue;
898
}
899
free(proc->buffer);
900
free(proc);
901
/* We deleted this process from the list, so we can't go
902
proc->next. Therefore, start over from the beginning of
903
the process list */
904
break;
1086
905
}
1087
1088
906
/* This process exited nicely, so print its buffer */
1089
907
1090
908
bool bret = print_out_password(proc->buffer,
1091
909
proc->buffer_length);
1092
910
if(not bret){
1095
913
}
1096
914
goto fallback;
1097
915
}
1098
1099
916
/* This process has not completed. Does it have any output? */
1100
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1101
warning from
1102
-Wconversion */
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1103
918
/* This process had nothing to say at this time */
1104
proc = proc->next;
1105
919
continue;
1106
920
}
1107
921
/* Before reading, make the process' data buffer large enough */
1108
922
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1109
923
proc->buffer = realloc(proc->buffer, proc->buffer_size
1110
924
+ (size_t) BUFFER_SIZE);
1111
if(proc->buffer == NULL){
925
if (proc->buffer == NULL){
1112
926
perror("malloc");
1113
927
exitstatus = EXIT_FAILURE;
1114
928
goto fallback;
1116
930
proc->buffer_size += BUFFER_SIZE;
1117
931
}
1118
932
/* Read from the process */
1119
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1120
proc->buffer
1121
+ proc->buffer_length,
1122
BUFFER_SIZE));
1123
if(sret < 0){
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1124
936
/* Read error from this process; ignore the error */
1125
proc = proc->next;
1126
937
continue;
1127
938
}
1128
if(sret == 0){
939
if(ret == 0){
1129
940
/* got EOF */
1130
941
proc->eof = true;
1131
942
} else {
1132
proc->buffer_length += (size_t) sret;
943
proc->buffer_length += (size_t) ret;
1133
944
}
1134
945
}
1135
946
}
1136
1137
947
948
1138
949
fallback:
1139
950
1140
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1141
952
/* Fallback if all plugins failed, none are found or an error
1142
953
occured */
1143
954
bool bret;
1144
955
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1145
956
char *passwordbuffer = getpass("Password: ");
1146
size_t len = strlen(passwordbuffer);
1147
/* Strip trailing newline */
1148
if(len > 0 and passwordbuffer[len-1] == '\n'){
1149
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1150
len--;
1151
}
1152
bret = print_out_password(passwordbuffer, len);
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1153
958
if(not bret){
1154
959
perror("print_out_password");
1155
960
exitstatus = EXIT_FAILURE;
1162
967
perror("sigaction");
1163
968
exitstatus = EXIT_FAILURE;
1164
969
}
1165
970
1166
971
if(custom_argv != NULL){
1167
972
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1168
973
free(*arg);
1169
974
}
1170
975
free(custom_argv);
1171
976
}
977
free_plugin_list(plugin_list);
1172
978
1173
979
if(dir != NULL){
1174
980
closedir(dir);
1175
981
}
1176
982
1177
/* Kill the processes */
1178
for(plugin *p = plugin_list; p != NULL; p = p->next){
1179
if(p->pid != 0){
1180
close(p->fd);
1181
ret = kill(p->pid, SIGTERM);
1182
if(ret == -1 and errno != ESRCH){
1183
/* Set-uid proccesses might not get closed */
1184
perror("kill");
1185
}
983
/* Free the process list and kill the processes */
984
for(process *next; process_list != NULL; process_list = next){
985
next = process_list->next;
986
close(process_list->fd);
987
ret = kill(process_list->pid, SIGTERM);
988
if(ret == -1 and errno != ESRCH){
989
/* set-uid proccesses migth not get closed */
990
perror("kill");
1186
991
}
992
free(process_list->buffer);
993
free(process_list);
1187
994
}
1188
995
1189
996
/* Wait for any remaining child processes to terminate */
1190
do {
997
do{
1191
998
ret = wait(NULL);
1192
999
} while(ret >= 0);
1193
1000
if(errno != ECHILD){
1194
1001
perror("wait");
1195
1002
}
1196
1197
free_plugin_list();
1198
1003
1199
1004
free(plugindir);
1200
1005
free(argfile);
1201
1006
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0