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- Committer: Teddy Hogeborn
- Date: 2010-10-13 06:12:52 UTC
- mto: (237.12.2 mandos-persistent) (24.1.171 mandos) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 282.
- Revision ID: teddy@fukt.bsnet.se-20101013061252-3a918xedja5caya8
* debian/mandos-client.lintian-overrides: Added plugins.d/plymouth.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- 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:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 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
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
asprintf(), O_CLOEXEC */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
35
36
uid_t, gid_t, getuid(), getgid(),
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
46
readdir(), closedir(), dirfd() */
45
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
48
fcntl(), setuid(), setgid(),
47
49
F_GETFD, F_SETFD, FD_CLOEXEC,
48
50
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
51
dup2(), STDOUT_FILENO, _exit(),
50
52
execv(), write(), read(),
51
53
close() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
55
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
61
64
#include <signal.h> /* struct sigaction, sigemptyset(),
62
65
sigaddset(), sigaction(),
63
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
69
78
#define PDIR "/lib/mandos/plugins.d"
70
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
80
72
const char *argp_program_version = "plugin-runner 1.0";
81
const char *argp_program_version = "plugin-runner " VERSION;
73
82
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
83
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
89
84
typedef struct plugin{
90
85
char *name; /* can be NULL or any plugin name */
91
86
char **argv;
93
88
char **environ;
94
89
int envc;
95
90
bool disabled;
91
92
/* Variables used for running processes*/
93
pid_t pid;
94
int fd;
95
char *buffer;
96
size_t buffer_size;
97
size_t buffer_length;
98
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
96
101
struct plugin *next;
97
102
} plugin;
98
103
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))){
104
static plugin *plugin_list = NULL;
105
106
/* Gets an existing plugin based on name,
107
or if none is found, creates a new one */
108
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
if((p->name == name)
112
or (p->name and name and (strcmp(p->name, name) == 0))){
103
113
return p;
104
114
}
105
115
}
106
116
/* Create a new plugin */
107
plugin *new_plugin = malloc(sizeof(plugin));
108
if (new_plugin == NULL){
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
109
122
return NULL;
110
123
}
111
124
char *copy_name = NULL;
112
125
if(name != NULL){
113
copy_name = strdup(name);
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
114
129
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
115
133
return NULL;
116
134
}
117
135
}
118
136
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
124
141
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
145
if(new_plugin->argv == NULL){
146
int e = errno;
127
147
free(copy_name);
128
148
free(new_plugin);
149
errno = e;
129
150
return NULL;
130
151
}
131
152
new_plugin->argv[0] = copy_name;
132
153
new_plugin->argv[1] = NULL;
133
134
new_plugin->environ = malloc(sizeof(char *));
154
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
135
158
if(new_plugin->environ == NULL){
159
int e = errno;
136
160
free(copy_name);
137
161
free(new_plugin->argv);
138
162
free(new_plugin);
163
errno = e;
139
164
return NULL;
140
165
}
141
166
new_plugin->environ[0] = NULL;
167
142
168
/* Append the new plugin to the list */
143
*plugin_list = new_plugin;
169
plugin_list = new_plugin;
144
170
return new_plugin;
145
171
}
146
172
148
174
static bool add_to_char_array(const char *new, char ***array,
149
175
int *len){
150
176
/* Resize the pointed-to array to hold one more pointer */
151
*array = realloc(*array, sizeof(char *)
152
* (size_t) ((*len) + 2));
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
153
181
/* Malloc check */
154
182
if(*array == NULL){
155
183
return false;
156
184
}
157
185
/* Make a copy of the new string */
158
char *copy = strdup(new);
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
159
190
if(copy == NULL){
160
191
return false;
161
192
}
176
207
}
177
208
178
209
/* Add to a plugin's environment */
179
static bool add_environment(plugin *p, const char *def){
210
static bool add_environment(plugin *p, const char *def, bool replace){
180
211
if(p == NULL){
181
212
return false;
182
213
}
214
/* namelen = length of name of environment variable */
215
size_t namelen = (size_t)(strchrnul(def, '=') - def);
216
/* Search for this environment variable */
217
for(char **e = p->environ; *e != NULL; e++){
218
if(strncmp(*e, def, namelen + 1) == 0){
219
/* It already exists */
220
if(replace){
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
225
if(new == NULL){
226
return false;
227
}
228
*e = new;
229
strcpy(*e, def);
230
}
231
return true;
232
}
233
}
183
234
return add_to_char_array(def, &(p->environ), &(p->envc));
184
235
}
185
236
186
187
237
/*
188
238
* Based on the example in the GNU LibC manual chapter 13.13 "File
189
239
* Descriptor Flags".
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
191
241
*/
192
static int set_cloexec_flag(int fd)
193
{
194
int ret = fcntl(fd, F_GETFD, 0);
242
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
195
244
/* If reading the flags failed, return error indication now. */
196
245
if(ret < 0){
197
246
return ret;
198
247
}
199
248
/* Store modified flag word in the descriptor. */
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
201
251
}
202
252
203
process *process_list = NULL;
204
253
205
254
/* Mark processes as completed when they exit, and save their exit
206
255
status. */
207
void handle_sigchld(__attribute__((unused)) int sig){
256
static void handle_sigchld(__attribute__((unused)) int sig){
257
int old_errno = errno;
208
258
while(true){
209
process *proc = process_list;
259
plugin *proc = plugin_list;
210
260
int status;
211
261
pid_t pid = waitpid(-1, &status, WNOHANG);
212
262
if(pid == 0){
214
264
break;
215
265
}
216
266
if(pid == -1){
217
if (errno != ECHILD){
218
perror("waitpid");
267
if(errno == ECHILD){
268
/* No child processes */
269
break;
219
270
}
220
/* No child processes */
221
break;
271
error(0, errno, "waitpid");
222
272
}
223
273
224
274
/* A child exited, find it in process_list */
225
275
while(proc != NULL and proc->pid != pid){
226
276
proc = proc->next;
230
280
continue;
231
281
}
232
282
proc->status = status;
233
proc->completed = true;
283
proc->completed = 1;
234
284
}
285
errno = old_errno;
235
286
}
236
287
237
bool print_out_password(const char *buffer, size_t length){
288
/* Prints out a password to stdout */
289
static bool print_out_password(const char *buffer, size_t length){
238
290
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
242
291
for(size_t written = 0; written < length; written += (size_t)ret){
243
292
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
244
293
length - written));
249
298
return true;
250
299
}
251
300
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);
301
/* Removes and free a plugin from the plugin list */
302
static void free_plugin(plugin *plugin_node){
303
304
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
305
free(*arg);
306
}
307
free(plugin_node->argv);
308
for(char **env = plugin_node->environ; *env != NULL; env++){
309
free(*env);
310
}
311
free(plugin_node->environ);
312
free(plugin_node->buffer);
313
314
/* Removes the plugin from the singly-linked list */
315
if(plugin_node == plugin_list){
316
/* First one - simple */
317
plugin_list = plugin_list->next;
318
} else {
319
/* Second one or later */
320
for(plugin *p = plugin_list; p != NULL; p = p->next){
321
if(p->next == plugin_node){
322
p->next = plugin_node->next;
323
break;
324
}
325
}
326
}
327
328
free(plugin_node);
329
}
330
331
static void free_plugin_list(void){
332
while(plugin_list != NULL){
333
free_plugin(plugin_list);
264
334
}
265
335
}
266
336
274
344
struct stat st;
275
345
fd_set rfds_all;
276
346
int ret, maxfd = 0;
347
ssize_t sret;
277
348
uid_t uid = 65534;
278
349
gid_t gid = 65534;
279
350
bool debug = false;
288
359
sigemptyset(&sigchld_action.sa_mask);
289
360
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
290
361
if(ret == -1){
291
perror("sigaddset");
292
exitstatus = EXIT_FAILURE;
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
293
364
goto fallback;
294
365
}
295
366
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
296
367
if(ret == -1){
297
perror("sigaction");
298
exitstatus = EXIT_FAILURE;
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
299
370
goto fallback;
300
371
}
301
372
304
375
{ .name = "global-options", .key = 'g',
305
376
.arg = "OPTION[,OPTION[,...]]",
306
377
.doc = "Options passed to all plugins" },
307
{ .name = "global-envs", .key = 'e',
378
{ .name = "global-env", .key = 'G',
308
379
.arg = "VAR=value",
309
380
.doc = "Environment variable passed to all plugins" },
310
381
{ .name = "options-for", .key = 'o',
311
382
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
312
383
.doc = "Options passed only to specified plugin" },
313
{ .name = "envs-for", .key = 'f',
384
{ .name = "env-for", .key = 'E',
314
385
.arg = "PLUGIN:ENV=value",
315
386
.doc = "Environment variable passed to specified plugin" },
316
387
{ .name = "disable", .key = 'd',
317
388
.arg = "PLUGIN",
318
389
.doc = "Disable a specific plugin", .group = 1 },
390
{ .name = "enable", .key = 'e',
391
.arg = "PLUGIN",
392
.doc = "Enable a specific plugin", .group = 1 },
319
393
{ .name = "plugin-dir", .key = 128,
320
394
.arg = "DIRECTORY",
321
395
.doc = "Specify a different plugin directory", .group = 2 },
330
404
.doc = "Group ID the plugins will run as", .group = 3 },
331
405
{ .name = "debug", .key = 132,
332
406
.doc = "Debug mode", .group = 4 },
407
/*
408
* These reproduce what we would get without ARGP_NO_HELP
409
*/
410
{ .name = "help", .key = '?',
411
.doc = "Give this help list", .group = -1 },
412
{ .name = "usage", .key = -3,
413
.doc = "Give a short usage message", .group = -1 },
414
{ .name = "version", .key = 'V',
415
.doc = "Print program version", .group = -1 },
333
416
{ .name = NULL }
334
417
};
335
418
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'){
346
continue;
347
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
349
perror("add_argument");
350
return ARGP_ERR_UNKNOWN;
351
}
352
}
353
}
354
break;
355
case 'e':
356
if(arg == NULL){
357
break;
358
}
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
}
367
}
368
break;
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
}
389
}
390
}
391
}
392
break;
393
case 'f':
394
if(arg == NULL){
395
break;
396
}
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
421
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
424
case 'g': /* --global-options */
425
{
426
char *plugin_option;
427
while((plugin_option = strsep(&arg, ",")) != NULL){
428
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
430
}
431
}
432
}
433
break;
434
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
436
break;
437
case 'o': /* --options-for */
438
{
439
char *option_list = strchr(arg, ':');
440
if(option_list == NULL){
441
argp_error(state, "No colon in \"%s\"", arg);
442
errno = EINVAL;
443
break;
444
}
445
*option_list = '\0';
446
option_list++;
447
if(arg[0] == '\0'){
448
argp_error(state, "Empty plugin name");
449
errno = EINVAL;
450
break;
451
}
452
char *option;
453
while((option = strsep(&option_list, ",")) != NULL){
454
if(not add_argument(getplugin(arg), option)){
455
break;
456
}
457
}
458
}
459
break;
460
case 'E': /* --env-for */
397
461
{
398
462
char *envdef = strchr(arg, ':');
399
463
if(envdef == NULL){
400
break;
401
}
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
466
break;
467
}
468
*envdef = '\0';
406
469
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
408
perror("add_environment");
409
}
410
}
411
break;
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
415
if(p == NULL){
416
return ARGP_ERR_UNKNOWN;
417
}
418
p->disabled = true;
419
}
420
break;
421
case 128:
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
474
}
475
add_environment(getplugin(arg), envdef, true);
476
}
477
break;
478
case 'd': /* --disable */
479
{
480
plugin *p = getplugin(arg);
481
if(p != NULL){
482
p->disabled = true;
483
}
484
}
485
break;
486
case 'e': /* --enable */
487
{
488
plugin *p = getplugin(arg);
489
if(p != NULL){
490
p->disabled = false;
491
}
492
}
493
break;
494
case 128: /* --plugin-dir */
495
free(plugindir);
422
496
plugindir = strdup(arg);
423
if(plugindir == NULL){
424
perror("strdup");
425
}
426
break;
427
case 129:
497
break;
498
case 129: /* --config-file */
499
/* This is already done by parse_opt_config_file() */
500
break;
501
case 130: /* --userid */
502
tmpmax = strtoimax(arg, &tmp, 10);
503
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
508
}
509
uid = (uid_t)tmpmax;
510
break;
511
case 131: /* --groupid */
512
tmpmax = strtoimax(arg, &tmp, 10);
513
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
518
}
519
gid = (gid_t)tmpmax;
520
break;
521
case 132: /* --debug */
522
debug = true;
523
break;
524
/*
525
* These reproduce what we would get without ARGP_NO_HELP
526
*/
527
case '?': /* --help */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
530
case -3: /* --usage */
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
argp_state_help(state, state->out_stream,
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
534
case 'V': /* --version */
535
fprintf(state->out_stream, "%s\n", argp_program_version);
536
exit(EXIT_SUCCESS);
537
break;
538
/*
539
* When adding more options before this line, remember to also add a
540
* "case" to the "parse_opt_config_file" function below.
541
*/
542
case ARGP_KEY_ARG:
543
/* Cryptsetup always passes an argument, which is an empty
544
string if "none" was specified in /etc/crypttab. So if
545
argument was empty, we ignore it silently. */
546
if(arg[0] == '\0'){
547
break;
548
}
549
default:
550
return ARGP_ERR_UNKNOWN;
551
}
552
return errno; /* Set to 0 at start */
553
}
554
555
/* This option parser is the same as parse_opt() above, except it
556
ignores everything but the --config-file option. */
557
error_t parse_opt_config_file(int key, char *arg,
558
__attribute__((unused))
559
struct argp_state *state){
560
errno = 0;
561
switch(key){
562
case 'g': /* --global-options */
563
case 'G': /* --global-env */
564
case 'o': /* --options-for */
565
case 'E': /* --env-for */
566
case 'd': /* --disable */
567
case 'e': /* --enable */
568
case 128: /* --plugin-dir */
569
break;
570
case 129: /* --config-file */
571
free(argfile);
428
572
argfile = strdup(arg);
429
if(argfile == NULL){
430
perror("strdup");
431
}
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;
573
break;
574
case 130: /* --userid */
575
case 131: /* --groupid */
576
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
442
580
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
445
case ARGP_KEY_END:
446
581
break;
447
582
default:
448
583
return ARGP_ERR_UNKNOWN;
449
584
}
450
return 0;
585
return errno;
451
586
}
452
587
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
588
struct argp argp = { .options = options,
589
.parser = parse_opt_config_file,
590
.args_doc = "",
457
591
.doc = "Mandos plugin runner -- Run plugins" };
458
592
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
461
fprintf(stderr, "Unknown error while parsing arguments\n");
462
exitstatus = EXIT_FAILURE;
593
/* Parse using parse_opt_config_file() in order to get the custom
594
config file location, if any. */
595
ret = argp_parse(&argp, argc, argv,
596
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
597
NULL, NULL);
598
switch(ret){
599
case 0:
600
break;
601
case ENOMEM:
602
default:
603
errno = ret;
604
error(0, errno, "argp_parse");
605
exitstatus = EX_OSERR;
606
goto fallback;
607
case EINVAL:
608
exitstatus = EX_USAGE;
463
609
goto fallback;
464
610
}
465
466
if (argfile == NULL){
611
612
/* Reset to the normal argument parser */
613
argp.parser = parse_opt;
614
615
/* Open the configfile if available */
616
if(argfile == NULL){
467
617
conffp = fopen(AFILE, "r");
468
618
} else {
469
619
conffp = fopen(argfile, "r");
470
620
}
471
472
621
if(conffp != NULL){
473
622
char *org_line = NULL;
474
623
char *p, *arg, *new_arg, *line;
475
624
size_t size = 0;
476
ssize_t sret;
477
625
const char whitespace_delims[] = " \r\t\f\v\n";
478
626
const char comment_delim[] = "#";
479
627
480
628
custom_argc = 1;
481
629
custom_argv = malloc(sizeof(char*) * 2);
482
630
if(custom_argv == NULL){
483
perror("malloc");
484
exitstatus = EXIT_FAILURE;
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
485
633
goto fallback;
486
634
}
487
635
custom_argv[0] = argv[0];
488
636
custom_argv[1] = NULL;
489
637
638
/* for each line in the config file, strip whitespace and ignore
639
commented text */
490
640
while(true){
491
641
sret = getline(&org_line, &size, conffp);
492
642
if(sret == -1){
493
643
break;
494
644
}
495
645
496
646
line = org_line;
497
647
arg = strsep(&line, comment_delim);
498
648
while((p = strsep(&arg, whitespace_delims)) != NULL){
501
651
}
502
652
new_arg = strdup(p);
503
653
if(new_arg == NULL){
504
perror("strdup");
505
exitstatus = EXIT_FAILURE;
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
506
656
free(org_line);
507
657
goto fallback;
508
658
}
511
661
custom_argv = realloc(custom_argv, sizeof(char *)
512
662
* ((unsigned int) custom_argc + 1));
513
663
if(custom_argv == NULL){
514
perror("realloc");
515
exitstatus = EXIT_FAILURE;
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
516
666
free(org_line);
517
667
goto fallback;
518
668
}
519
669
custom_argv[custom_argc-1] = new_arg;
520
custom_argv[custom_argc] = NULL;
670
custom_argv[custom_argc] = NULL;
521
671
}
522
672
}
673
do {
674
ret = fclose(conffp);
675
} while(ret == EOF and errno == EINTR);
676
if(ret == EOF){
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
679
goto fallback;
680
}
523
681
free(org_line);
524
} else{
682
} else {
525
683
/* Check for harmful errors and go to fallback. Other errors might
526
684
not affect opening plugins */
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
528
perror("fopen");
529
exitstatus = EXIT_FAILURE;
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
530
688
goto fallback;
531
689
}
532
690
}
533
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
534
693
if(custom_argv != NULL){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
537
fprintf(stderr, "Unknown error while parsing arguments\n");
538
exitstatus = EXIT_FAILURE;
694
ret = argp_parse(&argp, custom_argc, custom_argv,
695
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
696
NULL, NULL);
697
switch(ret){
698
case 0:
699
break;
700
case ENOMEM:
701
default:
702
errno = ret;
703
error(0, errno, "argp_parse");
704
exitstatus = EX_OSERR;
705
goto fallback;
706
case EINVAL:
707
exitstatus = EX_CONFIG;
539
708
goto fallback;
540
709
}
541
710
}
542
711
712
/* Parse actual command line arguments, to let them override the
713
config file */
714
ret = argp_parse(&argp, argc, argv,
715
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
716
NULL, NULL);
717
switch(ret){
718
case 0:
719
break;
720
case ENOMEM:
721
default:
722
errno = ret;
723
error(0, errno, "argp_parse");
724
exitstatus = EX_OSERR;
725
goto fallback;
726
case EINVAL:
727
exitstatus = EX_USAGE;
728
goto fallback;
729
}
730
543
731
if(debug){
544
732
for(plugin *p = plugin_list; p != NULL; p=p->next){
545
733
fprintf(stderr, "Plugin: %s has %d arguments\n",
547
735
for(char **a = p->argv; *a != NULL; a++){
548
736
fprintf(stderr, "\tArg: %s\n", *a);
549
737
}
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
738
fprintf(stderr, "...and %d environment variables\n", p->envc);
551
739
for(char **a = p->environ; *a != NULL; a++){
552
740
fprintf(stderr, "\t%s\n", *a);
553
741
}
554
742
}
555
743
}
556
744
745
/* Strip permissions down to nobody */
746
setgid(gid);
747
if(ret == -1){
748
error(0, errno, "setgid");
749
}
557
750
ret = setuid(uid);
558
if (ret == -1){
559
perror("setuid");
560
}
561
562
setgid(gid);
563
if (ret == -1){
564
perror("setgid");
565
}
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 */
751
if(ret == -1){
752
error(0, errno, "setuid");
753
}
754
755
/* Open plugin directory with close_on_exec flag */
580
756
{
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
}
757
int dir_fd = -1;
758
if(plugindir == NULL){
759
dir_fd = open(PDIR, O_RDONLY |
760
#ifdef O_CLOEXEC
761
O_CLOEXEC
762
#else /* not O_CLOEXEC */
763
0
764
#endif /* not O_CLOEXEC */
765
);
766
} else {
767
dir_fd = open(plugindir, O_RDONLY |
768
#ifdef O_CLOEXEC
769
O_CLOEXEC
770
#else /* not O_CLOEXEC */
771
0
772
#endif /* not O_CLOEXEC */
773
);
774
}
775
if(dir_fd == -1){
776
error(0, errno, "Could not open plugin dir");
777
exitstatus = EX_UNAVAILABLE;
778
goto fallback;
779
}
780
781
#ifndef O_CLOEXEC
782
/* Set the FD_CLOEXEC flag on the directory */
783
ret = set_cloexec_flag(dir_fd);
784
if(ret < 0){
785
error(0, errno, "set_cloexec_flag");
786
TEMP_FAILURE_RETRY(close(dir_fd));
787
exitstatus = EX_OSERR;
788
goto fallback;
789
}
790
#endif /* O_CLOEXEC */
791
792
dir = fdopendir(dir_fd);
793
if(dir == NULL){
794
error(0, errno, "Could not open plugin dir");
795
TEMP_FAILURE_RETRY(close(dir_fd));
796
exitstatus = EX_OSERR;
797
goto fallback;
589
798
}
590
799
}
591
800
592
801
FD_ZERO(&rfds_all);
593
802
803
/* Read and execute any executable in the plugin directory*/
594
804
while(true){
595
dirst = readdir(dir);
805
do {
806
dirst = readdir(dir);
807
} while(dirst == NULL and errno == EINTR);
596
808
597
// All directory entries have been processed
809
/* All directory entries have been processed */
598
810
if(dirst == NULL){
599
if (errno == EBADF){
600
perror("readdir");
601
exitstatus = EXIT_FAILURE;
811
if(errno == EBADF){
812
error(0, errno, "readdir");
813
exitstatus = EX_IOERR;
602
814
goto fallback;
603
815
}
604
816
break;
606
818
607
819
d_name_len = strlen(dirst->d_name);
608
820
609
// Ignore dotfiles, backup files and other junk
821
/* Ignore dotfiles, backup files and other junk */
610
822
{
611
823
bool bad_name = false;
612
824
614
826
615
827
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
616
828
".dpkg-old",
829
".dpkg-bak",
617
830
".dpkg-divert", NULL };
618
831
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
619
832
size_t pre_len = strlen(*pre);
627
840
break;
628
841
}
629
842
}
630
631
843
if(bad_name){
632
844
continue;
633
845
}
634
635
846
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
636
847
size_t suf_len = strlen(*suf);
637
848
if((d_name_len >= suf_len)
638
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
849
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
639
850
== 0)){
640
851
if(debug){
641
852
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
650
861
continue;
651
862
}
652
863
}
653
864
654
865
char *filename;
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
866
if(plugindir == NULL){
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
868
dirst->d_name));
869
} else {
870
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
871
plugindir,
872
dirst->d_name));
873
}
656
874
if(ret < 0){
657
perror("asprintf");
875
error(0, errno, "asprintf");
658
876
continue;
659
877
}
660
878
661
ret = stat(filename, &st);
662
if (ret == -1){
663
perror("stat");
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
880
if(ret == -1){
881
error(0, errno, "stat");
664
882
free(filename);
665
883
continue;
666
884
}
667
885
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
886
/* Ignore non-executable files */
887
if(not S_ISREG(st.st_mode)
888
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
669
889
if(debug){
670
890
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
671
891
" with bad type or mode\n", filename);
673
893
free(filename);
674
894
continue;
675
895
}
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
896
897
plugin *p = getplugin(dirst->d_name);
677
898
if(p == NULL){
678
perror("getplugin");
899
error(0, errno, "getplugin");
679
900
free(filename);
680
901
continue;
681
902
}
689
910
}
690
911
{
691
912
/* Add global arguments to argument list for this plugin */
692
plugin *g = getplugin(NULL, &plugin_list);
913
plugin *g = getplugin(NULL);
693
914
if(g != NULL){
694
915
for(char **a = g->argv + 1; *a != NULL; a++){
695
916
if(not add_argument(p, *a)){
696
perror("add_argument");
917
error(0, errno, "add_argument");
697
918
}
698
919
}
699
920
/* Add global environment variables */
700
921
for(char **e = g->environ; *e != NULL; e++){
701
if(not add_environment(p, *e)){
702
perror("add_environment");
922
if(not add_environment(p, *e, false)){
923
error(0, errno, "add_environment");
703
924
}
704
925
}
705
926
}
709
930
process, too. */
710
931
if(p->environ[0] != NULL){
711
932
for(char **e = environ; *e != NULL; e++){
712
char *copy = strdup(*e);
713
if(copy == NULL){
714
perror("strdup");
715
continue;
716
}
717
if(not add_environment(p, copy)){
718
perror("add_environment");
933
if(not add_environment(p, *e, false)){
934
error(0, errno, "add_environment");
719
935
}
720
936
}
721
937
}
722
938
723
939
int pipefd[2];
724
ret = pipe(pipefd);
725
if (ret == -1){
726
perror("pipe");
727
exitstatus = EXIT_FAILURE;
940
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
941
if(ret == -1){
942
error(0, errno, "pipe");
943
exitstatus = EX_OSERR;
728
944
goto fallback;
729
945
}
946
/* Ask OS to automatic close the pipe on exec */
730
947
ret = set_cloexec_flag(pipefd[0]);
731
948
if(ret < 0){
732
perror("set_cloexec_flag");
733
exitstatus = EXIT_FAILURE;
949
error(0, errno, "set_cloexec_flag");
950
exitstatus = EX_OSERR;
734
951
goto fallback;
735
952
}
736
953
ret = set_cloexec_flag(pipefd[1]);
737
954
if(ret < 0){
738
perror("set_cloexec_flag");
739
exitstatus = EXIT_FAILURE;
955
error(0, errno, "set_cloexec_flag");
956
exitstatus = EX_OSERR;
740
957
goto fallback;
741
958
}
742
959
/* Block SIGCHLD until process is safely in process list */
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
960
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
961
&sigchld_action.sa_mask,
962
NULL));
744
963
if(ret < 0){
745
perror("sigprocmask");
746
exitstatus = EXIT_FAILURE;
964
error(0, errno, "sigprocmask");
965
exitstatus = EX_OSERR;
747
966
goto fallback;
748
967
}
749
// Starting a new process to be watched
750
pid_t pid = fork();
968
/* Starting a new process to be watched */
969
pid_t pid;
970
do {
971
pid = fork();
972
} while(pid == -1 and errno == EINTR);
751
973
if(pid == -1){
752
perror("fork");
753
exitstatus = EXIT_FAILURE;
974
error(0, errno, "fork");
975
exitstatus = EX_OSERR;
754
976
goto fallback;
755
977
}
756
978
if(pid == 0){
757
979
/* this is the child process */
758
980
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
759
981
if(ret < 0){
760
perror("sigaction");
761
_exit(EXIT_FAILURE);
982
error(0, errno, "sigaction");
983
_exit(EX_OSERR);
762
984
}
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
985
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
764
986
if(ret < 0){
765
perror("sigprocmask");
766
_exit(EXIT_FAILURE);
987
error(0, errno, "sigprocmask");
988
_exit(EX_OSERR);
767
989
}
768
990
769
991
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
770
992
if(ret == -1){
771
perror("dup2");
772
_exit(EXIT_FAILURE);
993
error(0, errno, "dup2");
994
_exit(EX_OSERR);
773
995
}
774
996
775
997
if(dirfd(dir) < 0){
779
1001
}
780
1002
if(p->environ[0] == NULL){
781
1003
if(execv(filename, p->argv) < 0){
782
perror("execv");
783
_exit(EXIT_FAILURE);
1004
error(0, errno, "execv for %s", filename);
1005
_exit(EX_OSERR);
784
1006
}
785
1007
} else {
786
1008
if(execve(filename, p->argv, p->environ) < 0){
787
perror("execve");
788
_exit(EXIT_FAILURE);
1009
error(0, errno, "execve for %s", filename);
1010
_exit(EX_OSERR);
789
1011
}
790
1012
}
791
1013
/* no return */
792
1014
}
793
/* parent process */
1015
/* Parent process */
1016
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1017
pipe */
794
1018
free(filename);
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);
1019
plugin *new_plugin = getplugin(dirst->d_name);
1020
if(new_plugin == NULL){
1021
error(0, errno, "getplugin");
1022
ret = (int)(TEMP_FAILURE_RETRY
1023
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1024
NULL)));
800
1025
if(ret < 0){
801
perror("sigprocmask");
1026
error(0, errno, "sigprocmask");
802
1027
}
803
exitstatus = EXIT_FAILURE;
1028
exitstatus = EX_OSERR;
804
1029
goto fallback;
805
1030
}
806
1031
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
1032
new_plugin->pid = pid;
1033
new_plugin->fd = pipefd[0];
1034
812
1035
/* Unblock SIGCHLD so signal handler can be run if this process
813
1036
has already completed */
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1037
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1038
&sigchld_action.sa_mask,
1039
NULL));
815
1040
if(ret < 0){
816
perror("sigprocmask");
817
exitstatus = EXIT_FAILURE;
1041
error(0, errno, "sigprocmask");
1042
exitstatus = EX_OSERR;
818
1043
goto fallback;
819
1044
}
820
1045
821
FD_SET(new_process->fd, &rfds_all);
1046
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
-Wconversion */
822
1048
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
1049
if(maxfd < new_plugin->fd){
1050
maxfd = new_plugin->fd;
825
1051
}
826
827
1052
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
831
1053
832
closedir(dir);
1054
TEMP_FAILURE_RETRY(closedir(dir));
833
1055
dir = NULL;
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
1056
free_plugin(getplugin(NULL));
1057
1058
for(plugin *p = plugin_list; p != NULL; p = p->next){
1059
if(p->pid != 0){
1060
break;
1061
}
1062
if(p->next == NULL){
1063
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1064
" directory?\n");
1065
free_plugin_list();
1066
}
839
1067
}
840
while(process_list){
1068
1069
/* Main loop while running plugins exist */
1070
while(plugin_list){
841
1071
fd_set rfds = rfds_all;
842
1072
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
843
if (select_ret == -1){
844
perror("select");
845
exitstatus = EXIT_FAILURE;
1073
if(select_ret == -1 and errno != EINTR){
1074
error(0, errno, "select");
1075
exitstatus = EX_OSERR;
846
1076
goto fallback;
847
1077
}
848
1078
/* OK, now either a process completed, or something can be read
849
1079
from one of them */
850
for(process *proc = process_list; proc ; proc = proc->next){
1080
for(plugin *proc = plugin_list; proc != NULL;){
851
1081
/* Is this process completely done? */
852
if(proc->eof and proc->completed){
1082
if(proc->completed and proc->eof){
853
1083
/* Only accept the plugin output if it exited cleanly */
854
1084
if(not WIFEXITED(proc->status)
855
1085
or WEXITSTATUS(proc->status) != 0){
856
1086
/* Bad exit by plugin */
1087
857
1088
if(debug){
858
1089
if(WIFEXITED(proc->status)){
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
1090
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1091
" status %d\n", proc->name,
1092
(intmax_t) (proc->pid),
861
1093
WEXITSTATUS(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));
1094
} else if(WIFSIGNALED(proc->status)){
1095
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1096
" signal %d: %s\n", proc->name,
1097
(intmax_t) (proc->pid),
1098
WTERMSIG(proc->status),
1099
strsignal(WTERMSIG(proc->status)));
866
1100
} else if(WCOREDUMP(proc->status)){
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
1101
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1102
" core\n", proc->name, (intmax_t) (proc->pid));
869
1103
}
870
1104
}
1105
871
1106
/* Remove the plugin */
872
FD_CLR(proc->fd, &rfds_all);
1107
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
-Wconversion */
1109
873
1110
/* Block signal while modifying process_list */
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1112
(SIG_BLOCK,
1113
&sigchld_action.sa_mask,
1114
NULL));
875
1115
if(ret < 0){
876
perror("sigprocmask");
877
exitstatus = EXIT_FAILURE;
1116
error(0, errno, "sigprocmask");
1117
exitstatus = EX_OSERR;
878
1118
goto fallback;
879
1119
}
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
}
1120
1121
plugin *next_plugin = proc->next;
1122
free_plugin(proc);
1123
proc = next_plugin;
1124
893
1125
/* We are done modifying process list, so unblock signal */
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1126
ret = (int)(TEMP_FAILURE_RETRY
1127
(sigprocmask(SIG_UNBLOCK,
1128
&sigchld_action.sa_mask, NULL)));
896
1129
if(ret < 0){
897
perror("sigprocmask");
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;
1130
error(0, errno, "sigprocmask");
1131
exitstatus = EX_OSERR;
1132
goto fallback;
1133
}
1134
1135
if(plugin_list == NULL){
1136
break;
1137
}
1138
1139
continue;
905
1140
}
1141
906
1142
/* This process exited nicely, so print its buffer */
907
1143
908
1144
bool bret = print_out_password(proc->buffer,
909
1145
proc->buffer_length);
910
1146
if(not bret){
911
perror("print_out_password");
912
exitstatus = EXIT_FAILURE;
1147
error(0, errno, "print_out_password");
1148
exitstatus = EX_IOERR;
913
1149
}
914
1150
goto fallback;
915
1151
}
1152
916
1153
/* This process has not completed. Does it have any output? */
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1154
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1155
warning from
1156
-Wconversion */
918
1157
/* This process had nothing to say at this time */
1158
proc = proc->next;
919
1159
continue;
920
1160
}
921
1161
/* Before reading, make the process' data buffer large enough */
922
1162
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
923
1163
proc->buffer = realloc(proc->buffer, proc->buffer_size
924
1164
+ (size_t) BUFFER_SIZE);
925
if (proc->buffer == NULL){
926
perror("malloc");
927
exitstatus = EXIT_FAILURE;
1165
if(proc->buffer == NULL){
1166
error(0, errno, "malloc");
1167
exitstatus = EX_OSERR;
928
1168
goto fallback;
929
1169
}
930
1170
proc->buffer_size += BUFFER_SIZE;
931
1171
}
932
1172
/* Read from the process */
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1173
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1174
proc->buffer
1175
+ proc->buffer_length,
1176
BUFFER_SIZE));
1177
if(sret < 0){
936
1178
/* Read error from this process; ignore the error */
1179
proc = proc->next;
937
1180
continue;
938
1181
}
939
if(ret == 0){
1182
if(sret == 0){
940
1183
/* got EOF */
941
1184
proc->eof = true;
942
1185
} else {
943
proc->buffer_length += (size_t) ret;
1186
proc->buffer_length += (size_t) sret;
944
1187
}
945
1188
}
946
1189
}
947
948
1190
1191
949
1192
fallback:
950
1193
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1194
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1195
and exitstatus != EX_OK)){
952
1196
/* Fallback if all plugins failed, none are found or an error
953
1197
occured */
954
1198
bool bret;
955
1199
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
956
1200
char *passwordbuffer = getpass("Password: ");
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1201
size_t len = strlen(passwordbuffer);
1202
/* Strip trailing newline */
1203
if(len > 0 and passwordbuffer[len-1] == '\n'){
1204
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1205
len--;
1206
}
1207
bret = print_out_password(passwordbuffer, len);
958
1208
if(not bret){
959
perror("print_out_password");
960
exitstatus = EXIT_FAILURE;
1209
error(0, errno, "print_out_password");
1210
exitstatus = EX_IOERR;
961
1211
}
962
1212
}
963
1213
964
1214
/* Restore old signal handler */
965
1215
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
966
1216
if(ret == -1){
967
perror("sigaction");
968
exitstatus = EXIT_FAILURE;
1217
error(0, errno, "sigaction");
1218
exitstatus = EX_OSERR;
969
1219
}
970
1220
971
1221
if(custom_argv != NULL){
972
1222
for(char **arg = custom_argv+1; *arg != NULL; arg++){
973
1223
free(*arg);
974
1224
}
975
1225
free(custom_argv);
976
1226
}
977
free_plugin_list(plugin_list);
978
1227
979
1228
if(dir != NULL){
980
1229
closedir(dir);
981
1230
}
982
1231
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");
1232
/* Kill the processes */
1233
for(plugin *p = plugin_list; p != NULL; p = p->next){
1234
if(p->pid != 0){
1235
close(p->fd);
1236
ret = kill(p->pid, SIGTERM);
1237
if(ret == -1 and errno != ESRCH){
1238
/* Set-uid proccesses might not get closed */
1239
error(0, errno, "kill");
1240
}
991
1241
}
992
free(process_list->buffer);
993
free(process_list);
994
1242
}
995
1243
996
1244
/* Wait for any remaining child processes to terminate */
997
do{
1245
do {
998
1246
ret = wait(NULL);
999
1247
} while(ret >= 0);
1000
1248
if(errno != ECHILD){
1001
perror("wait");
1249
error(0, errno, "wait");
1002
1250
}
1003
1251
1252
free_plugin_list();
1253
1004
1254
free(plugindir);
1005
1255
free(argfile);
1006
1256
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0