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- Committer: Teddy Hogeborn
- Date: 2014-06-22 02:19:30 UTC
- Revision ID: teddy@recompile.se-20140622021930-icl7h4cm97blhjml
mandos-keygen: Generate "checker" option to use SSH fingerprints.
To turn this off, use a new "--no-ssh" option to mandos-keygen.
* INSTALL (Mandos Server, Mandos Client): Document new suggested
installation of SSH.
* Makefile (confdir/clients.conf): Use new "--no-ssh" option to
"mandos-keygen".
* debian/control (mandos/Depends): Changed to "fping | ssh-client".
(mandos-client/Recommends): New; set to "ssh".
* intro.xml (FREQUENTLY ASKED QUESTIONS): Rename and rewrite section
called "Faking ping
replies?" to address new
default behavior.
* mandos-clients.conf.xml (OPTIONS/checker): Briefly discuss new
behavior of
mandos-keygen.
* mandos-keygen: Bug fix: Suppress failure output of "shred" to remove
"sec*", since no such files may exist.
(password mode): Scan for SSH key fingerprints and output as new
"checker" and "ssh_fingerprint" options, unless new
"--no-ssh" option is given.
* mandos-keygen.xml (SYNOPSIS/--force): Bug fix: Document short form.
(OPTIONS/--no-ssh): New.
(SEE ALSO): Add reference "ssh-keyscan(1)".
* plugins.d/mandos-client.xml (SECURITY): Briefly mention the
possibility of using SSH key
fingerprints for checking.
To turn this off, use a new "--no-ssh" option to mandos-keygen.
* INSTALL (Mandos Server, Mandos Client): Document new suggested
installation of SSH.
* Makefile (confdir/clients.conf): Use new "--no-ssh" option to
"mandos-keygen".
* debian/control (mandos/Depends): Changed to "fping | ssh-client".
(mandos-client/Recommends): New; set to "ssh".
* intro.xml (FREQUENTLY ASKED QUESTIONS): Rename and rewrite section
called "Faking ping
replies?" to address new
default behavior.
* mandos-clients.conf.xml (OPTIONS/checker): Briefly discuss new
behavior of
mandos-keygen.
* mandos-keygen: Bug fix: Suppress failure output of "shred" to remove
"sec*", since no such files may exist.
(password mode): Scan for SSH key fingerprints and output as new
"checker" and "ssh_fingerprint" options, unless new
"--no-ssh" option is given.
* mandos-keygen.xml (SYNOPSIS/--force): Bug fix: Document short form.
(OPTIONS/--no-ssh): New.
(SEE ALSO): Add reference "ssh-keyscan(1)".
* plugins.d/mandos-client.xml (SECURITY): Briefly mention the
possibility of using SSH key
fingerprints for checking.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- 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 © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 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
18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
20
21
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
O_CLOEXEC, pipe2() */
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
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
37
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
38
FD_SET(), FD_ISSET(), FD_CLR */
39
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
40
WEXITSTATUS(), WTERMSIG(),
41
WCOREDUMP() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
43
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
57
#include <errno.h> /* errno */
56
58
#include <argp.h> /* struct argp_option, struct
57
59
argp_state, struct argp,
61
63
#include <signal.h> /* struct sigaction, sigemptyset(),
62
64
sigaddset(), sigaction(),
63
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
68
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
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";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
83
77
84
typedef struct plugin{
78
85
char *name; /* can be NULL or any plugin name */
81
88
char **environ;
82
89
int envc;
83
90
bool disabled;
84
91
85
92
/* Variables used for running processes*/
86
93
pid_t pid;
87
94
int fd;
89
96
size_t buffer_size;
90
97
size_t buffer_length;
91
98
bool eof;
92
volatile bool completed;
93
volatile int status;
99
volatile sig_atomic_t completed;
100
int status;
94
101
struct plugin *next;
95
102
} plugin;
96
103
97
104
static plugin *plugin_list = NULL;
98
105
99
/* Gets a existing plugin based on name,
106
/* Gets an existing plugin based on name,
100
107
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
101
109
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))){
110
/* Check for existing plugin with that name */
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
if((p->name == name)
113
or (p->name and name and (strcmp(p->name, name) == 0))){
106
114
return p;
107
115
}
108
116
}
109
117
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
118
plugin *new_plugin = NULL;
119
do {
120
new_plugin = malloc(sizeof(plugin));
121
} while(new_plugin == NULL and errno == EINTR);
122
if(new_plugin == NULL){
112
123
return NULL;
113
124
}
114
125
char *copy_name = NULL;
115
126
if(name != NULL){
116
copy_name = strdup(name);
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
117
130
if(copy_name == NULL){
131
int e = errno;
132
free(new_plugin);
133
errno = e;
118
134
return NULL;
119
135
}
120
136
}
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
137
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
142
143
do {
144
new_plugin->argv = malloc(sizeof(char *) * 2);
145
} while(new_plugin->argv == NULL and errno == EINTR);
146
if(new_plugin->argv == NULL){
147
int e = errno;
129
148
free(copy_name);
130
149
free(new_plugin);
150
errno = e;
131
151
return NULL;
132
152
}
133
153
new_plugin->argv[0] = copy_name;
134
154
new_plugin->argv[1] = NULL;
135
155
136
new_plugin->environ = malloc(sizeof(char *));
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
137
159
if(new_plugin->environ == NULL){
160
int e = errno;
138
161
free(copy_name);
139
162
free(new_plugin->argv);
140
163
free(new_plugin);
164
errno = e;
141
165
return NULL;
142
166
}
143
167
new_plugin->environ[0] = NULL;
148
172
}
149
173
150
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
151
176
static bool add_to_char_array(const char *new, char ***array,
152
177
int *len){
153
178
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
179
char **new_array = NULL;
180
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
156
184
/* Malloc check */
157
if(*array == NULL){
185
if(new_array == NULL){
158
186
return false;
159
187
}
188
*array = new_array;
160
189
/* Make a copy of the new string */
161
char *copy = strdup(new);
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
162
194
if(copy == NULL){
163
195
return false;
164
196
}
171
203
}
172
204
173
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
174
207
static bool add_argument(plugin *p, const char *arg){
175
208
if(p == NULL){
176
209
return false;
179
212
}
180
213
181
214
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
182
216
static bool add_environment(plugin *p, const char *def, bool replace){
183
217
if(p == NULL){
184
218
return false;
186
220
/* namelen = length of name of environment variable */
187
221
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
222
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
191
225
/* It already exists */
192
226
if(replace){
193
char *new = realloc(*e, strlen(def));
194
if(new == NULL){
227
char *new_envdef;
228
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
195
232
return false;
196
233
}
197
*e = new;
198
strcpy(*e, def);
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
199
236
}
200
237
return true;
201
238
}
203
240
return add_to_char_array(def, &(p->environ), &(p->envc));
204
241
}
205
242
243
#ifndef O_CLOEXEC
206
244
/*
207
245
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
246
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
248
*/
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
249
__attribute__((warn_unused_result))
250
static int set_cloexec_flag(int fd){
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
252
/* If reading the flags failed, return error indication now. */
215
253
if(ret < 0){
216
254
return ret;
217
255
}
218
256
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
ret | FD_CLOEXEC));
220
259
}
260
#endif /* not O_CLOEXEC */
221
261
222
262
223
263
/* Mark processes as completed when they exit, and save their exit
224
264
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
265
static void handle_sigchld(__attribute__((unused)) int sig){
266
int old_errno = errno;
226
267
while(true){
227
268
plugin *proc = plugin_list;
228
269
int status;
232
273
break;
233
274
}
234
275
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
276
if(errno == ECHILD){
277
/* No child processes */
278
break;
237
279
}
238
/* No child processes */
239
break;
280
error(0, errno, "waitpid");
240
281
}
241
282
242
283
/* A child exited, find it in process_list */
243
284
while(proc != NULL and proc->pid != pid){
244
285
proc = proc->next;
248
289
continue;
249
290
}
250
291
proc->status = status;
251
proc->completed = true;
292
proc->completed = 1;
252
293
}
294
errno = old_errno;
253
295
}
254
296
255
297
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
298
__attribute__((nonnull, warn_unused_result))
299
static bool print_out_password(const char *buffer, size_t length){
257
300
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
261
301
for(size_t written = 0; written < length; written += (size_t)ret){
262
302
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
303
length - written));
269
309
}
270
310
271
311
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
272
313
static void free_plugin(plugin *plugin_node){
273
314
274
315
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
280
321
}
281
322
free(plugin_node->environ);
282
323
free(plugin_node->buffer);
283
324
284
325
/* Removes the plugin from the singly-linked list */
285
326
if(plugin_node == plugin_list){
286
327
/* First one - simple */
308
349
char *plugindir = NULL;
309
350
char *argfile = NULL;
310
351
FILE *conffp;
311
size_t d_name_len;
312
DIR *dir = NULL;
313
struct dirent *dirst;
352
struct dirent **direntries = NULL;
314
353
struct stat st;
315
354
fd_set rfds_all;
316
355
int ret, maxfd = 0;
356
ssize_t sret;
317
357
uid_t uid = 65534;
318
358
gid_t gid = 65534;
319
359
bool debug = false;
323
363
.sa_flags = SA_NOCLDSTOP };
324
364
char **custom_argv = NULL;
325
365
int custom_argc = 0;
366
int dir_fd = -1;
326
367
327
368
/* Establish a signal handler */
328
369
sigemptyset(&sigchld_action.sa_mask);
329
370
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
330
371
if(ret == -1){
331
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
333
374
goto fallback;
334
375
}
335
376
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
336
377
if(ret == -1){
337
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
339
380
goto fallback;
340
381
}
341
382
344
385
{ .name = "global-options", .key = 'g',
345
386
.arg = "OPTION[,OPTION[,...]]",
346
387
.doc = "Options passed to all plugins" },
347
{ .name = "global-env", .key = 'e',
388
{ .name = "global-env", .key = 'G',
348
389
.arg = "VAR=value",
349
390
.doc = "Environment variable passed to all plugins" },
350
391
{ .name = "options-for", .key = 'o',
351
392
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
352
393
.doc = "Options passed only to specified plugin" },
353
{ .name = "env-for", .key = 'f',
394
{ .name = "env-for", .key = 'E',
354
395
.arg = "PLUGIN:ENV=value",
355
396
.doc = "Environment variable passed to specified plugin" },
356
397
{ .name = "disable", .key = 'd',
357
398
.arg = "PLUGIN",
358
399
.doc = "Disable a specific plugin", .group = 1 },
400
{ .name = "enable", .key = 'e',
401
.arg = "PLUGIN",
402
.doc = "Enable a specific plugin", .group = 1 },
359
403
{ .name = "plugin-dir", .key = 128,
360
404
.arg = "DIRECTORY",
361
405
.doc = "Specify a different plugin directory", .group = 2 },
370
414
.doc = "Group ID the plugins will run as", .group = 3 },
371
415
{ .name = "debug", .key = 132,
372
416
.doc = "Debug mode", .group = 4 },
417
/*
418
* These reproduce what we would get without ARGP_NO_HELP
419
*/
420
{ .name = "help", .key = '?',
421
.doc = "Give this help list", .group = -1 },
422
{ .name = "usage", .key = -3,
423
.doc = "Give a short usage message", .group = -1 },
424
{ .name = "version", .key = 'V',
425
.doc = "Print program version", .group = -1 },
373
426
{ .name = NULL }
374
427
};
375
428
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
switch (key) {
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
431
errno = 0;
432
switch(key){
433
char *tmp;
434
intmax_t tmp_id;
379
435
case 'g': /* --global-options */
380
if (arg != NULL){
381
char *p;
382
while((p = strsep(&arg, ",")) != NULL){
383
if(p[0] == '\0'){
384
continue;
385
}
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
389
}
390
}
391
}
392
break;
393
case 'e': /* --global-env */
394
if(arg == NULL){
395
break;
396
}
397
436
{
398
char *envdef = strdup(arg);
399
if(envdef == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), envdef, true)){
403
perror("add_environment");
404
}
437
char *plugin_option;
438
while((plugin_option = strsep(&arg, ",")) != NULL){
439
if(not add_argument(getplugin(NULL), plugin_option)){
440
break;
441
}
442
}
443
errno = 0;
444
}
445
break;
446
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
405
449
}
406
450
break;
407
451
case 'o': /* --options-for */
408
if (arg != NULL){
409
char *p_name = strsep(&arg, ":");
410
if(p_name[0] == '\0'){
411
break;
412
}
413
char *opt = strsep(&arg, ":");
414
if(opt[0] == '\0'){
415
break;
416
}
417
if(opt != NULL){
418
char *p;
419
while((p = strsep(&opt, ",")) != NULL){
420
if(p[0] == '\0'){
421
continue;
422
}
423
if(not add_argument(getplugin(p_name), p)){
424
perror("add_argument");
425
return ARGP_ERR_UNKNOWN;
426
}
452
{
453
char *option_list = strchr(arg, ':');
454
if(option_list == NULL){
455
argp_error(state, "No colon in \"%s\"", arg);
456
errno = EINVAL;
457
break;
458
}
459
*option_list = '\0';
460
option_list++;
461
if(arg[0] == '\0'){
462
argp_error(state, "Empty plugin name");
463
errno = EINVAL;
464
break;
465
}
466
char *option;
467
while((option = strsep(&option_list, ",")) != NULL){
468
if(not add_argument(getplugin(arg), option)){
469
break;
427
470
}
428
471
}
472
errno = 0;
429
473
}
430
474
break;
431
case 'f': /* --env-for */
432
if(arg == NULL){
433
break;
434
}
475
case 'E': /* --env-for */
435
476
{
436
477
char *envdef = strchr(arg, ':');
437
478
if(envdef == NULL){
438
break;
439
}
440
char *p_name = strndup(arg, (size_t) (envdef-arg));
441
if(p_name == NULL){
442
break;
443
}
479
argp_error(state, "No colon in \"%s\"", arg);
480
errno = EINVAL;
481
break;
482
}
483
*envdef = '\0';
444
484
envdef++;
445
if(not add_environment(getplugin(p_name), envdef, true)){
446
perror("add_environment");
485
if(arg[0] == '\0'){
486
argp_error(state, "Empty plugin name");
487
errno = EINVAL;
488
break;
489
}
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
447
492
}
448
493
}
449
494
break;
450
495
case 'd': /* --disable */
451
if (arg != NULL){
452
plugin *p = getplugin(arg);
453
if(p == NULL){
454
return ARGP_ERR_UNKNOWN;
455
}
456
p->disabled = true;
496
{
497
plugin *p = getplugin(arg);
498
if(p != NULL){
499
p->disabled = true;
500
errno = 0;
501
}
502
}
503
break;
504
case 'e': /* --enable */
505
{
506
plugin *p = getplugin(arg);
507
if(p != NULL){
508
p->disabled = false;
509
errno = 0;
510
}
457
511
}
458
512
break;
459
513
case 128: /* --plugin-dir */
514
free(plugindir);
460
515
plugindir = strdup(arg);
461
if(plugindir == NULL){
462
perror("strdup");
463
}
516
if(plugindir != NULL){
517
errno = 0;
518
}
464
519
break;
465
520
case 129: /* --config-file */
466
521
/* This is already done by parse_opt_config_file() */
467
522
break;
468
523
case 130: /* --userid */
469
uid = (uid_t)strtol(arg, NULL, 10);
524
tmp_id = strtoimax(arg, &tmp, 10);
525
if(errno != 0 or tmp == arg or *tmp != '\0'
526
or tmp_id != (uid_t)tmp_id){
527
argp_error(state, "Bad user ID number: \"%s\", using %"
528
PRIdMAX, arg, (intmax_t)uid);
529
break;
530
}
531
uid = (uid_t)tmp_id;
532
errno = 0;
470
533
break;
471
534
case 131: /* --groupid */
472
gid = (gid_t)strtol(arg, NULL, 10);
535
tmp_id = strtoimax(arg, &tmp, 10);
536
if(errno != 0 or tmp == arg or *tmp != '\0'
537
or tmp_id != (gid_t)tmp_id){
538
argp_error(state, "Bad group ID number: \"%s\", using %"
539
PRIdMAX, arg, (intmax_t)gid);
540
break;
541
}
542
gid = (gid_t)tmp_id;
543
errno = 0;
473
544
break;
474
545
case 132: /* --debug */
475
546
debug = true;
476
547
break;
548
/*
549
* These reproduce what we would get without ARGP_NO_HELP
550
*/
551
case '?': /* --help */
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
554
case -3: /* --usage */
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
556
argp_state_help(state, state->out_stream,
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
558
case 'V': /* --version */
559
fprintf(state->out_stream, "%s\n", argp_program_version);
560
exit(EXIT_SUCCESS);
561
break;
562
/*
563
* When adding more options before this line, remember to also add a
564
* "case" to the "parse_opt_config_file" function below.
565
*/
477
566
case ARGP_KEY_ARG:
478
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
479
break;
480
case ARGP_KEY_END:
481
break;
567
/* Cryptsetup always passes an argument, which is an empty
568
string if "none" was specified in /etc/crypttab. So if
569
argument was empty, we ignore it silently. */
570
if(arg[0] == '\0'){
571
break;
572
}
482
573
default:
483
574
return ARGP_ERR_UNKNOWN;
484
575
}
485
return 0;
576
return errno; /* Set to 0 at start */
486
577
}
487
578
488
579
/* This option parser is the same as parse_opt() above, except it
489
580
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
581
error_t parse_opt_config_file(int key, char *arg,
582
__attribute__((unused))
583
struct argp_state *state){
584
errno = 0;
585
switch(key){
494
586
case 'g': /* --global-options */
495
case 'e': /* --global-env */
587
case 'G': /* --global-env */
496
588
case 'o': /* --options-for */
497
case 'f': /* --env-for */
589
case 'E': /* --env-for */
498
590
case 'd': /* --disable */
591
case 'e': /* --enable */
499
592
case 128: /* --plugin-dir */
500
593
break;
501
594
case 129: /* --config-file */
595
free(argfile);
502
596
argfile = strdup(arg);
503
if(argfile == NULL){
504
perror("strdup");
597
if(argfile != NULL){
598
errno = 0;
505
599
}
506
break;
600
break;
507
601
case 130: /* --userid */
508
602
case 131: /* --groupid */
509
603
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
510
607
case ARGP_KEY_ARG:
511
case ARGP_KEY_END:
512
608
break;
513
609
default:
514
610
return ARGP_ERR_UNKNOWN;
515
611
}
516
return 0;
612
return errno;
517
613
}
518
614
519
615
struct argp argp = { .options = options,
521
617
.args_doc = "",
522
618
.doc = "Mandos plugin runner -- Run plugins" };
523
619
524
/* Parse using the parse_opt_config_file in order to get the custom
620
/* Parse using parse_opt_config_file() in order to get the custom
525
621
config file location, if any. */
526
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
527
if (ret == ARGP_ERR_UNKNOWN){
528
fprintf(stderr, "Unknown error while parsing arguments\n");
529
exitstatus = EXIT_FAILURE;
622
ret = argp_parse(&argp, argc, argv,
623
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
624
NULL, NULL);
625
switch(ret){
626
case 0:
627
break;
628
case ENOMEM:
629
default:
630
errno = ret;
631
error(0, errno, "argp_parse");
632
exitstatus = EX_OSERR;
633
goto fallback;
634
case EINVAL:
635
exitstatus = EX_USAGE;
530
636
goto fallback;
531
637
}
532
638
534
640
argp.parser = parse_opt;
535
641
536
642
/* Open the configfile if available */
537
if (argfile == NULL){
643
if(argfile == NULL){
538
644
conffp = fopen(AFILE, "r");
539
645
} else {
540
646
conffp = fopen(argfile, "r");
541
}
647
}
542
648
if(conffp != NULL){
543
649
char *org_line = NULL;
544
650
char *p, *arg, *new_arg, *line;
545
651
size_t size = 0;
546
ssize_t sret;
547
652
const char whitespace_delims[] = " \r\t\f\v\n";
548
653
const char comment_delim[] = "#";
549
654
550
655
custom_argc = 1;
551
656
custom_argv = malloc(sizeof(char*) * 2);
552
657
if(custom_argv == NULL){
553
perror("malloc");
554
exitstatus = EXIT_FAILURE;
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
555
660
goto fallback;
556
661
}
557
662
custom_argv[0] = argv[0];
558
663
custom_argv[1] = NULL;
559
664
560
665
/* for each line in the config file, strip whitespace and ignore
561
666
commented text */
562
667
while(true){
564
669
if(sret == -1){
565
670
break;
566
671
}
567
672
568
673
line = org_line;
569
674
arg = strsep(&line, comment_delim);
570
675
while((p = strsep(&arg, whitespace_delims)) != NULL){
573
678
}
574
679
new_arg = strdup(p);
575
680
if(new_arg == NULL){
576
perror("strdup");
577
exitstatus = EXIT_FAILURE;
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
578
683
free(org_line);
579
684
goto fallback;
580
685
}
581
686
582
687
custom_argc += 1;
583
custom_argv = realloc(custom_argv, sizeof(char *)
584
* ((unsigned int) custom_argc + 1));
585
if(custom_argv == NULL){
586
perror("realloc");
587
exitstatus = EXIT_FAILURE;
588
free(org_line);
589
goto fallback;
688
{
689
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
695
free(new_arg);
696
free(org_line);
697
goto fallback;
698
} else {
699
custom_argv = new_argv;
700
}
590
701
}
591
702
custom_argv[custom_argc-1] = new_arg;
592
custom_argv[custom_argc] = NULL;
703
custom_argv[custom_argc] = NULL;
593
704
}
594
705
}
706
do {
707
ret = fclose(conffp);
708
} while(ret == EOF and errno == EINTR);
709
if(ret == EOF){
710
error(0, errno, "fclose");
711
exitstatus = EX_IOERR;
712
goto fallback;
713
}
595
714
free(org_line);
596
715
} else {
597
716
/* Check for harmful errors and go to fallback. Other errors might
598
717
not affect opening plugins */
599
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
600
perror("fopen");
601
exitstatus = EXIT_FAILURE;
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
602
721
goto fallback;
603
722
}
604
723
}
605
/* If there was any arguments from configuration file,
606
pass them to parser as command arguments */
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
607
726
if(custom_argv != NULL){
608
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
609
0, NULL);
610
if (ret == ARGP_ERR_UNKNOWN){
611
fprintf(stderr, "Unknown error while parsing arguments\n");
612
exitstatus = EXIT_FAILURE;
727
ret = argp_parse(&argp, custom_argc, custom_argv,
728
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
729
NULL, NULL);
730
switch(ret){
731
case 0:
732
break;
733
case ENOMEM:
734
default:
735
errno = ret;
736
error(0, errno, "argp_parse");
737
exitstatus = EX_OSERR;
738
goto fallback;
739
case EINVAL:
740
exitstatus = EX_CONFIG;
613
741
goto fallback;
614
742
}
615
743
}
616
744
617
745
/* Parse actual command line arguments, to let them override the
618
746
config file */
619
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
620
if (ret == ARGP_ERR_UNKNOWN){
621
fprintf(stderr, "Unknown error while parsing arguments\n");
622
exitstatus = EXIT_FAILURE;
747
ret = argp_parse(&argp, argc, argv,
748
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
749
NULL, NULL);
750
switch(ret){
751
case 0:
752
break;
753
case ENOMEM:
754
default:
755
errno = ret;
756
error(0, errno, "argp_parse");
757
exitstatus = EX_OSERR;
758
goto fallback;
759
case EINVAL:
760
exitstatus = EX_USAGE;
623
761
goto fallback;
624
762
}
625
763
630
768
for(char **a = p->argv; *a != NULL; a++){
631
769
fprintf(stderr, "\tArg: %s\n", *a);
632
770
}
633
fprintf(stderr, "...and %u environment variables\n", p->envc);
771
fprintf(stderr, "...and %d environment variables\n", p->envc);
634
772
for(char **a = p->environ; *a != NULL; a++){
635
773
fprintf(stderr, "\t%s\n", *a);
636
774
}
637
775
}
638
776
}
639
777
640
/* Strip permissions down to nobody */
778
if(getuid() == 0){
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
786
} else {
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
788
if(ret == -1){
789
error(0, errno, "fstat");
790
} else {
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
793
if(ret == -1){
794
error(0, errno, "fchown");
795
}
796
}
797
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
799
}
800
}
801
802
/* Lower permissions */
803
ret = setgid(gid);
804
if(ret == -1){
805
error(0, errno, "setgid");
806
}
641
807
ret = setuid(uid);
642
if (ret == -1){
643
perror("setuid");
644
}
645
setgid(gid);
646
if (ret == -1){
647
perror("setgid");
648
}
649
650
if (plugindir == NULL){
651
dir = opendir(PDIR);
652
} else {
653
dir = opendir(plugindir);
654
}
655
656
if(dir == NULL){
657
perror("Could not open plugin dir");
658
exitstatus = EXIT_FAILURE;
659
goto fallback;
660
}
661
662
/* Set the FD_CLOEXEC flag on the directory, if possible */
808
if(ret == -1){
809
error(0, errno, "setuid");
810
}
811
812
/* Open plugin directory with close_on_exec flag */
663
813
{
664
int dir_fd = dirfd(dir);
665
if(dir_fd >= 0){
666
ret = set_cloexec_flag(dir_fd);
667
if(ret < 0){
668
perror("set_cloexec_flag");
669
exitstatus = EXIT_FAILURE;
670
goto fallback;
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
815
#ifdef O_CLOEXEC
816
O_CLOEXEC
817
#else /* not O_CLOEXEC */
818
0
819
#endif /* not O_CLOEXEC */
820
);
821
if(dir_fd == -1){
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
824
goto fallback;
825
}
826
827
#ifndef O_CLOEXEC
828
/* Set the FD_CLOEXEC flag on the directory */
829
ret = set_cloexec_flag(dir_fd);
830
if(ret < 0){
831
error(0, errno, "set_cloexec_flag");
832
exitstatus = EX_OSERR;
833
goto fallback;
834
}
835
#endif /* O_CLOEXEC */
836
}
837
838
int good_name(const struct dirent * const dirent){
839
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
840
"*.dpkg-old", "*.dpkg-bak",
841
"*.dpkg-divert", NULL };
842
#ifdef __GNUC__
843
#pragma GCC diagnostic push
844
#pragma GCC diagnostic ignored "-Wcast-qual"
845
#endif
846
for(const char **pat = (const char **)patterns;
847
*pat != NULL; pat++){
848
#ifdef __GNUC__
849
#pragma GCC diagnostic pop
850
#endif
851
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
852
!= FNM_NOMATCH){
853
if(debug){
854
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
855
" matching pattern %s\n", dirent->d_name, *pat);
856
}
857
return 0;
671
858
}
672
859
}
860
return 1;
861
}
862
863
#ifdef __GLIBC__
864
#if __GLIBC_PREREQ(2, 15)
865
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
866
alphasort);
867
#else /* not __GLIBC_PREREQ(2, 15) */
868
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
869
&direntries, good_name, alphasort);
870
#endif /* not __GLIBC_PREREQ(2, 15) */
871
#else /* not __GLIBC__ */
872
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
873
&direntries, good_name, alphasort);
874
#endif /* not __GLIBC__ */
875
if(numplugins == -1){
876
error(0, errno, "Could not scan plugin dir");
877
direntries = NULL;
878
exitstatus = EX_OSERR;
879
goto fallback;
673
880
}
674
881
675
882
FD_ZERO(&rfds_all);
676
883
677
884
/* Read and execute any executable in the plugin directory*/
678
while(true){
679
dirst = readdir(dir);
680
681
/* All directory entries have been processed */
682
if(dirst == NULL){
683
if (errno == EBADF){
684
perror("readdir");
685
exitstatus = EXIT_FAILURE;
686
goto fallback;
687
}
688
break;
689
}
690
691
d_name_len = strlen(dirst->d_name);
692
693
/* Ignore dotfiles, backup files and other junk */
694
{
695
bool bad_name = false;
696
697
const char const *bad_prefixes[] = { ".", "#", NULL };
698
699
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
700
".dpkg-old",
701
".dpkg-divert", NULL };
702
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
703
size_t pre_len = strlen(*pre);
704
if((d_name_len >= pre_len)
705
and strncmp((dirst->d_name), *pre, pre_len) == 0){
706
if(debug){
707
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
708
" with bad prefix %s\n", dirst->d_name, *pre);
709
}
710
bad_name = true;
711
break;
712
}
713
}
714
if(bad_name){
715
continue;
716
}
717
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
718
size_t suf_len = strlen(*suf);
719
if((d_name_len >= suf_len)
720
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
721
== 0)){
722
if(debug){
723
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
724
" with bad suffix %s\n", dirst->d_name, *suf);
725
}
726
bad_name = true;
727
break;
728
}
729
}
730
731
if(bad_name){
732
continue;
733
}
734
}
735
736
char *filename;
737
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
738
if(ret < 0){
739
perror("asprintf");
740
continue;
741
}
742
743
ret = stat(filename, &st);
744
if (ret == -1){
745
perror("stat");
746
free(filename);
747
continue;
748
}
749
885
for(int i = 0; i < numplugins; i++){
886
887
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
888
if(plugin_fd == -1){
889
error(0, errno, "Could not open plugin");
890
continue;
891
}
892
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
893
if(ret == -1){
894
error(0, errno, "stat");
895
TEMP_FAILURE_RETRY(close(plugin_fd));
896
continue;
897
}
898
750
899
/* Ignore non-executable files */
751
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
900
if(not S_ISREG(st.st_mode)
901
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
902
X_OK, 0)) != 0)){
752
903
if(debug){
753
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
754
" with bad type or mode\n", filename);
904
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
905
" with bad type or mode\n",
906
plugindir != NULL ? plugindir : PDIR,
907
direntries[i]->d_name);
755
908
}
756
free(filename);
909
TEMP_FAILURE_RETRY(close(plugin_fd));
757
910
continue;
758
911
}
759
912
760
plugin *p = getplugin(dirst->d_name);
913
plugin *p = getplugin(direntries[i]->d_name);
761
914
if(p == NULL){
762
perror("getplugin");
763
free(filename);
915
error(0, errno, "getplugin");
916
TEMP_FAILURE_RETRY(close(plugin_fd));
764
917
continue;
765
918
}
766
919
if(p->disabled){
767
920
if(debug){
768
921
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
769
dirst->d_name);
922
direntries[i]->d_name);
770
923
}
771
free(filename);
924
TEMP_FAILURE_RETRY(close(plugin_fd));
772
925
continue;
773
926
}
774
927
{
777
930
if(g != NULL){
778
931
for(char **a = g->argv + 1; *a != NULL; a++){
779
932
if(not add_argument(p, *a)){
780
perror("add_argument");
933
error(0, errno, "add_argument");
781
934
}
782
935
}
783
936
/* Add global environment variables */
784
937
for(char **e = g->environ; *e != NULL; e++){
785
938
if(not add_environment(p, *e, false)){
786
perror("add_environment");
939
error(0, errno, "add_environment");
787
940
}
788
941
}
789
942
}
790
943
}
791
/* If this plugin has any environment variables, we will call
792
using execve and need to duplicate the environment from this
793
process, too. */
944
/* If this plugin has any environment variables, we need to
945
duplicate the environment from this process, too. */
794
946
if(p->environ[0] != NULL){
795
947
for(char **e = environ; *e != NULL; e++){
796
948
if(not add_environment(p, *e, false)){
797
perror("add_environment");
949
error(0, errno, "add_environment");
798
950
}
799
951
}
800
952
}
801
953
802
954
int pipefd[2];
803
ret = pipe(pipefd);
804
if (ret == -1){
805
perror("pipe");
806
exitstatus = EXIT_FAILURE;
807
goto fallback;
808
}
955
#ifndef O_CLOEXEC
956
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
957
#else /* O_CLOEXEC */
958
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
959
#endif /* O_CLOEXEC */
960
if(ret == -1){
961
error(0, errno, "pipe");
962
exitstatus = EX_OSERR;
963
goto fallback;
964
}
965
if(pipefd[0] >= FD_SETSIZE){
966
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
967
FD_SETSIZE);
968
TEMP_FAILURE_RETRY(close(pipefd[0]));
969
TEMP_FAILURE_RETRY(close(pipefd[1]));
970
exitstatus = EX_OSERR;
971
goto fallback;
972
}
973
#ifndef O_CLOEXEC
809
974
/* Ask OS to automatic close the pipe on exec */
810
975
ret = set_cloexec_flag(pipefd[0]);
811
976
if(ret < 0){
812
perror("set_cloexec_flag");
813
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
TEMP_FAILURE_RETRY(close(pipefd[0]));
979
TEMP_FAILURE_RETRY(close(pipefd[1]));
980
exitstatus = EX_OSERR;
814
981
goto fallback;
815
982
}
816
983
ret = set_cloexec_flag(pipefd[1]);
817
984
if(ret < 0){
818
perror("set_cloexec_flag");
819
exitstatus = EXIT_FAILURE;
985
error(0, errno, "set_cloexec_flag");
986
TEMP_FAILURE_RETRY(close(pipefd[0]));
987
TEMP_FAILURE_RETRY(close(pipefd[1]));
988
exitstatus = EX_OSERR;
820
989
goto fallback;
821
990
}
991
#endif /* not O_CLOEXEC */
822
992
/* Block SIGCHLD until process is safely in process list */
823
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
993
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
994
&sigchld_action.sa_mask,
995
NULL));
824
996
if(ret < 0){
825
perror("sigprocmask");
826
exitstatus = EXIT_FAILURE;
997
error(0, errno, "sigprocmask");
998
exitstatus = EX_OSERR;
827
999
goto fallback;
828
1000
}
829
1001
/* Starting a new process to be watched */
830
pid_t pid = fork();
1002
pid_t pid;
1003
do {
1004
pid = fork();
1005
} while(pid == -1 and errno == EINTR);
831
1006
if(pid == -1){
832
perror("fork");
833
exitstatus = EXIT_FAILURE;
1007
error(0, errno, "fork");
1008
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1009
&sigchld_action.sa_mask, NULL));
1010
TEMP_FAILURE_RETRY(close(pipefd[0]));
1011
TEMP_FAILURE_RETRY(close(pipefd[1]));
1012
exitstatus = EX_OSERR;
834
1013
goto fallback;
835
1014
}
836
1015
if(pid == 0){
837
1016
/* this is the child process */
838
1017
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
839
1018
if(ret < 0){
840
perror("sigaction");
841
_exit(EXIT_FAILURE);
1019
error(0, errno, "sigaction");
1020
_exit(EX_OSERR);
842
1021
}
843
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1022
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
844
1023
if(ret < 0){
845
perror("sigprocmask");
846
_exit(EXIT_FAILURE);
1024
error(0, errno, "sigprocmask");
1025
_exit(EX_OSERR);
847
1026
}
848
1027
849
1028
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
850
1029
if(ret == -1){
851
perror("dup2");
852
_exit(EXIT_FAILURE);
1030
error(0, errno, "dup2");
1031
_exit(EX_OSERR);
853
1032
}
854
1033
855
if(dirfd(dir) < 0){
856
/* If dir has no file descriptor, we could not set FD_CLOEXEC
857
above and must now close it manually here. */
858
closedir(dir);
859
}
860
if(p->environ[0] == NULL){
861
if(execv(filename, p->argv) < 0){
862
perror("execv");
863
_exit(EXIT_FAILURE);
864
}
865
} else {
866
if(execve(filename, p->argv, p->environ) < 0){
867
perror("execve");
868
_exit(EXIT_FAILURE);
869
}
1034
if(fexecve(plugin_fd, p->argv,
1035
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1036
error(0, errno, "fexecve for %s/%s",
1037
plugindir != NULL ? plugindir : PDIR,
1038
direntries[i]->d_name);
1039
_exit(EX_OSERR);
870
1040
}
871
1041
/* no return */
872
1042
}
873
1043
/* Parent process */
874
close(pipefd[1]); /* Close unused write end of pipe */
875
free(filename);
876
plugin *new_plugin = getplugin(dirst->d_name);
877
if (new_plugin == NULL){
878
perror("getplugin");
879
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
1046
TEMP_FAILURE_RETRY(close(plugin_fd));
1047
plugin *new_plugin = getplugin(direntries[i]->d_name);
1048
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
NULL)));
880
1053
if(ret < 0){
881
perror("sigprocmask");
1054
error(0, errno, "sigprocmask");
882
1055
}
883
exitstatus = EXIT_FAILURE;
1056
exitstatus = EX_OSERR;
884
1057
goto fallback;
885
1058
}
886
1059
889
1062
890
1063
/* Unblock SIGCHLD so signal handler can be run if this process
891
1064
has already completed */
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
893
1068
if(ret < 0){
894
perror("sigprocmask");
895
exitstatus = EXIT_FAILURE;
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
896
1071
goto fallback;
897
1072
}
898
1073
899
FD_SET(new_plugin->fd, &rfds_all);
1074
#if defined (__GNUC__) and defined (__GLIBC__)
1075
#if not __GLIBC_PREREQ(2, 16)
1076
#pragma GCC diagnostic push
1077
#pragma GCC diagnostic ignored "-Wsign-conversion"
1078
#endif
1079
#endif
1080
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1081
-Wconversion in GNU libc
1082
before 2.16 */
1083
#if defined (__GNUC__) and defined (__GLIBC__)
1084
#if not __GLIBC_PREREQ(2, 16)
1085
#pragma GCC diagnostic pop
1086
#endif
1087
#endif
900
1088
901
if (maxfd < new_plugin->fd){
1089
if(maxfd < new_plugin->fd){
902
1090
maxfd = new_plugin->fd;
903
1091
}
904
905
1092
}
906
1093
907
closedir(dir);
908
dir = NULL;
909
1094
free(direntries);
1095
direntries = NULL;
1096
TEMP_FAILURE_RETRY(close(dir_fd));
1097
dir_fd = -1;
1098
free_plugin(getplugin(NULL));
1099
910
1100
for(plugin *p = plugin_list; p != NULL; p = p->next){
911
1101
if(p->pid != 0){
912
1102
break;
917
1107
free_plugin_list();
918
1108
}
919
1109
}
920
1110
921
1111
/* Main loop while running plugins exist */
922
1112
while(plugin_list){
923
1113
fd_set rfds = rfds_all;
924
1114
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
925
if (select_ret == -1){
926
perror("select");
927
exitstatus = EXIT_FAILURE;
1115
if(select_ret == -1 and errno != EINTR){
1116
error(0, errno, "select");
1117
exitstatus = EX_OSERR;
928
1118
goto fallback;
929
1119
}
930
1120
/* OK, now either a process completed, or something can be read
931
1121
from one of them */
932
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1122
for(plugin *proc = plugin_list; proc != NULL;){
933
1123
/* Is this process completely done? */
934
if(proc->eof and proc->completed){
1124
if(proc->completed and proc->eof){
935
1125
/* Only accept the plugin output if it exited cleanly */
936
1126
if(not WIFEXITED(proc->status)
937
1127
or WEXITSTATUS(proc->status) != 0){
938
1128
/* Bad exit by plugin */
939
1129
940
1130
if(debug){
941
1131
if(WIFEXITED(proc->status)){
942
fprintf(stderr, "Plugin %u exited with status %d\n",
943
(unsigned int) (proc->pid),
1132
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1133
" status %d\n", proc->name,
1134
(intmax_t) (proc->pid),
944
1135
WEXITSTATUS(proc->status));
945
} else if(WIFSIGNALED(proc->status)) {
946
fprintf(stderr, "Plugin %u killed by signal %d\n",
947
(unsigned int) (proc->pid),
948
WTERMSIG(proc->status));
1136
} else if(WIFSIGNALED(proc->status)){
1137
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1138
" signal %d: %s\n", proc->name,
1139
(intmax_t) (proc->pid),
1140
WTERMSIG(proc->status),
1141
strsignal(WTERMSIG(proc->status)));
949
1142
} else if(WCOREDUMP(proc->status)){
950
fprintf(stderr, "Plugin %d dumped core\n",
951
(unsigned int) (proc->pid));
1143
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1144
" core\n", proc->name, (intmax_t) (proc->pid));
952
1145
}
953
1146
}
954
1147
955
1148
/* Remove the plugin */
956
FD_CLR(proc->fd, &rfds_all);
957
1149
#if defined (__GNUC__) and defined (__GLIBC__)
1150
#if not __GLIBC_PREREQ(2, 16)
1151
#pragma GCC diagnostic push
1152
#pragma GCC diagnostic ignored "-Wsign-conversion"
1153
#endif
1154
#endif
1155
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1156
-Wconversion in GNU libc
1157
before 2.16 */
1158
#if defined (__GNUC__) and defined (__GLIBC__)
1159
#if not __GLIBC_PREREQ(2, 16)
1160
#pragma GCC diagnostic pop
1161
#endif
1162
#endif
1163
958
1164
/* Block signal while modifying process_list */
959
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1165
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1166
(SIG_BLOCK,
1167
&sigchld_action.sa_mask,
1168
NULL));
960
1169
if(ret < 0){
961
perror("sigprocmask");
962
exitstatus = EXIT_FAILURE;
1170
error(0, errno, "sigprocmask");
1171
exitstatus = EX_OSERR;
963
1172
goto fallback;
964
1173
}
1174
1175
plugin *next_plugin = proc->next;
965
1176
free_plugin(proc);
1177
proc = next_plugin;
1178
966
1179
/* We are done modifying process list, so unblock signal */
967
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
968
NULL);
1180
ret = (int)(TEMP_FAILURE_RETRY
1181
(sigprocmask(SIG_UNBLOCK,
1182
&sigchld_action.sa_mask, NULL)));
969
1183
if(ret < 0){
970
perror("sigprocmask");
971
exitstatus = EXIT_FAILURE;
1184
error(0, errno, "sigprocmask");
1185
exitstatus = EX_OSERR;
972
1186
goto fallback;
973
1187
}
974
1188
975
1189
if(plugin_list == NULL){
976
1190
break;
977
1191
}
1192
978
1193
continue;
979
1194
}
980
1195
981
1196
/* This process exited nicely, so print its buffer */
982
1197
983
1198
bool bret = print_out_password(proc->buffer,
984
1199
proc->buffer_length);
985
1200
if(not bret){
986
perror("print_out_password");
987
exitstatus = EXIT_FAILURE;
1201
error(0, errno, "print_out_password");
1202
exitstatus = EX_IOERR;
988
1203
}
989
1204
goto fallback;
990
1205
}
991
1206
992
1207
/* This process has not completed. Does it have any output? */
993
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1208
#if defined (__GNUC__) and defined (__GLIBC__)
1209
#if not __GLIBC_PREREQ(2, 16)
1210
#pragma GCC diagnostic push
1211
#pragma GCC diagnostic ignored "-Wsign-conversion"
1212
#endif
1213
#endif
1214
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1215
warning from
1216
-Wconversion
1217
in GNU libc
1218
before
1219
2.16 */
1220
#if defined (__GNUC__) and defined (__GLIBC__)
1221
#if not __GLIBC_PREREQ(2, 16)
1222
#pragma GCC diagnostic pop
1223
#endif
1224
#endif
994
1225
/* This process had nothing to say at this time */
1226
proc = proc->next;
995
1227
continue;
996
1228
}
997
1229
/* Before reading, make the process' data buffer large enough */
998
1230
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
999
proc->buffer = realloc(proc->buffer, proc->buffer_size
1000
+ (size_t) BUFFER_SIZE);
1001
if (proc->buffer == NULL){
1002
perror("malloc");
1003
exitstatus = EXIT_FAILURE;
1231
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1232
+ (size_t) BUFFER_SIZE);
1233
if(new_buffer == NULL){
1234
error(0, errno, "malloc");
1235
exitstatus = EX_OSERR;
1004
1236
goto fallback;
1005
1237
}
1238
proc->buffer = new_buffer;
1006
1239
proc->buffer_size += BUFFER_SIZE;
1007
1240
}
1008
1241
/* Read from the process */
1009
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1010
BUFFER_SIZE);
1011
if(ret < 0){
1242
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1243
proc->buffer
1244
+ proc->buffer_length,
1245
BUFFER_SIZE));
1246
if(sret < 0){
1012
1247
/* Read error from this process; ignore the error */
1248
proc = proc->next;
1013
1249
continue;
1014
1250
}
1015
if(ret == 0){
1251
if(sret == 0){
1016
1252
/* got EOF */
1017
1253
proc->eof = true;
1018
1254
} else {
1019
proc->buffer_length += (size_t) ret;
1255
proc->buffer_length += (size_t) sret;
1020
1256
}
1021
1257
}
1022
1258
}
1023
1024
1259
1260
1025
1261
fallback:
1026
1262
1027
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1263
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1264
and exitstatus != EX_OK)){
1028
1265
/* Fallback if all plugins failed, none are found or an error
1029
1266
occured */
1030
1267
bool bret;
1031
1268
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1032
1269
char *passwordbuffer = getpass("Password: ");
1033
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1270
size_t len = strlen(passwordbuffer);
1271
/* Strip trailing newline */
1272
if(len > 0 and passwordbuffer[len-1] == '\n'){
1273
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1274
len--;
1275
}
1276
bret = print_out_password(passwordbuffer, len);
1034
1277
if(not bret){
1035
perror("print_out_password");
1036
exitstatus = EXIT_FAILURE;
1278
error(0, errno, "print_out_password");
1279
exitstatus = EX_IOERR;
1037
1280
}
1038
1281
}
1039
1282
1040
1283
/* Restore old signal handler */
1041
1284
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1042
1285
if(ret == -1){
1043
perror("sigaction");
1044
exitstatus = EXIT_FAILURE;
1286
error(0, errno, "sigaction");
1287
exitstatus = EX_OSERR;
1045
1288
}
1046
1289
1047
1290
if(custom_argv != NULL){
1048
1291
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1049
1292
free(*arg);
1051
1294
free(custom_argv);
1052
1295
}
1053
1296
1054
if(dir != NULL){
1055
closedir(dir);
1297
free(direntries);
1298
1299
if(dir_fd != -1){
1300
TEMP_FAILURE_RETRY(close(dir_fd));
1056
1301
}
1057
1302
1058
/* Free the process list and kill the processes */
1303
/* Kill the processes */
1059
1304
for(plugin *p = plugin_list; p != NULL; p = p->next){
1060
1305
if(p->pid != 0){
1061
1306
close(p->fd);
1062
1307
ret = kill(p->pid, SIGTERM);
1063
1308
if(ret == -1 and errno != ESRCH){
1064
1309
/* Set-uid proccesses might not get closed */
1065
perror("kill");
1310
error(0, errno, "kill");
1066
1311
}
1067
1312
}
1068
1313
}
1069
1314
1070
1315
/* Wait for any remaining child processes to terminate */
1071
do{
1316
do {
1072
1317
ret = wait(NULL);
1073
1318
} while(ret >= 0);
1074
1319
if(errno != ECHILD){
1075
perror("wait");
1320
error(0, errno, "wait");
1076
1321
}
1077
1322
1078
1323
free_plugin_list();
1079
1324
1080
1325
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0