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- Committer: Björn Påhlsson
- Date: 2008-08-03 20:35:01 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 41.
- Revision ID: belorn@braxen-20080803203501-av7janz21ve7iq0b
mandosclient
Droping privileges
split gnutls function into global and session
* server.py (if_nametoindex): Redefine itself instead of using a
default keyword argument.
Droping privileges
split gnutls function into global and session
* server.py (if_nametoindex): Redefine itself instead of using a
default keyword argument.
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugbasedclient.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
21
20
*
22
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
32
27
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
28
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir(), stat(),
30
struct stat, waitpid(),
31
WIFEXITED(), WEXITSTATUS(),
32
wait() */
33
#include <sys/wait.h> /* wait() */
34
#include <dirent.h> /* DIR, struct dirent, opendir(),
35
readdir(), closedir() */
43
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
readdir(), closedir(), dirfd() */
47
37
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
53
close() */
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
38
fcntl() */
39
#include <fcntl.h> /* fcntl() */
40
#include <stddef.h> /* NULL */
41
#include <stdlib.h> /* EXIT_FAILURE */
42
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
43
FD_SET(), FD_ISSET() */
44
#include <string.h> /* strlen(), strcpy(), strcat() */
45
#include <stdbool.h> /* true */
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
47
WEXITSTATUS() */
58
48
#include <errno.h> /* errno */
59
#include <argp.h> /* struct argp_option, struct
60
argp_state, struct argp,
61
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
64
#include <signal.h> /* struct sigaction, sigemptyset(),
65
sigaddset(), sigaction(),
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
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() */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
75
52
76
53
#define BUFFER_SIZE 256
77
54
78
#define PDIR "/lib/mandos/plugins.d"
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
83
84
typedef struct plugin{
85
char *name; /* can be NULL or any plugin name */
86
char **argv;
87
int argc;
88
char **environ;
89
int envc;
90
bool disabled;
91
92
/* Variables used for running processes*/
55
struct process;
56
57
typedef struct process{
93
58
pid_t pid;
94
59
int fd;
95
60
char *buffer;
96
61
size_t buffer_size;
97
62
size_t buffer_length;
98
63
bool eof;
99
volatile sig_atomic_t completed;
64
bool completed;
100
65
int status;
66
struct process *next;
67
} process;
68
69
typedef struct plugin{
70
char *name; /* can be NULL or any plugin name */
71
char **argv;
72
int argc;
73
bool disabled;
101
74
struct plugin *next;
102
75
} plugin;
103
76
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))){
77
static plugin *getplugin(char *name, plugin **plugin_list){
78
for (plugin *p = *plugin_list; p != NULL; p = p->next){
79
if ((p->name == name)
80
or (p->name and name and (strcmp(p->name, name) == 0))){
113
81
return p;
114
82
}
115
83
}
116
84
/* Create a new plugin */
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){
122
return NULL;
123
}
124
char *copy_name = NULL;
125
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
129
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
133
return NULL;
134
}
135
}
136
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
141
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;
147
free(copy_name);
148
free(new_plugin);
149
errno = e;
150
return NULL;
151
}
152
new_plugin->argv[0] = copy_name;
85
plugin *new_plugin = malloc(sizeof(plugin));
86
if (new_plugin == NULL){
87
perror("malloc");
88
exit(EXIT_FAILURE);
89
}
90
new_plugin->name = name;
91
new_plugin->argv = malloc(sizeof(char *) * 2);
92
if (new_plugin->argv == NULL){
93
perror("malloc");
94
exit(EXIT_FAILURE);
95
}
96
new_plugin->argv[0] = name;
153
97
new_plugin->argv[1] = NULL;
154
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
158
if(new_plugin->environ == NULL){
159
int e = errno;
160
free(copy_name);
161
free(new_plugin->argv);
162
free(new_plugin);
163
errno = e;
164
return NULL;
165
}
166
new_plugin->environ[0] = NULL;
167
98
new_plugin->argc = 1;
99
new_plugin->disabled = false;
100
new_plugin->next = *plugin_list;
168
101
/* Append the new plugin to the list */
169
plugin_list = new_plugin;
102
*plugin_list = new_plugin;
170
103
return new_plugin;
171
104
}
172
105
173
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
175
static bool add_to_char_array(const char *new, char ***array,
176
int *len){
177
/* Resize the pointed-to array to hold one more pointer */
178
char **new_array = NULL;
179
do {
180
new_array = realloc(*array, sizeof(char *)
181
* (size_t) ((*len) + 2));
182
} while(new_array == NULL and errno == EINTR);
183
/* Malloc check */
184
if(new_array == NULL){
185
return false;
186
}
187
*array = new_array;
188
/* Make a copy of the new string */
189
char *copy;
190
do {
191
copy = strdup(new);
192
} while(copy == NULL and errno == EINTR);
193
if(copy == NULL){
194
return false;
195
}
196
/* Insert the copy */
197
(*array)[*len] = copy;
198
(*len)++;
199
/* Add a new terminating NULL pointer to the last element */
200
(*array)[*len] = NULL;
201
return true;
202
}
203
204
/* Add to a plugin's argument vector */
205
__attribute__((nonnull(2)))
206
static bool add_argument(plugin *p, const char *arg){
207
if(p == NULL){
208
return false;
209
}
210
return add_to_char_array(arg, &(p->argv), &(p->argc));
211
}
212
213
/* Add to a plugin's environment */
214
__attribute__((nonnull(2)))
215
static bool add_environment(plugin *p, const char *def, bool replace){
216
if(p == NULL){
217
return false;
218
}
219
/* namelen = length of name of environment variable */
220
size_t namelen = (size_t)(strchrnul(def, '=') - def);
221
/* Search for this environment variable */
222
for(char **envdef = p->environ; *envdef != NULL; envdef++){
223
if(strncmp(*envdef, def, namelen + 1) == 0){
224
/* It already exists */
225
if(replace){
226
char *new_envdef;
227
do {
228
new_envdef = realloc(*envdef, strlen(def) + 1);
229
} while(new_envdef == NULL and errno == EINTR);
230
if(new_envdef == NULL){
231
return false;
232
}
233
*envdef = new_envdef;
234
strcpy(*envdef, def);
235
}
236
return true;
237
}
238
}
239
return add_to_char_array(def, &(p->environ), &(p->envc));
106
static void addargument(plugin *p, char *arg){
107
p->argv[p->argc] = arg;
108
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
109
if (p->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
112
}
113
p->argc++;
114
p->argv[p->argc] = NULL;
240
115
}
241
116
242
117
/*
243
118
* Based on the example in the GNU LibC manual chapter 13.13 "File
244
119
* Descriptor Flags".
245
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
120
* *Note File Descriptor Flags:(libc)Descriptor Flags.
246
121
*/
247
static int set_cloexec_flag(int fd){
248
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
122
static int set_cloexec_flag(int fd)
123
{
124
int ret = fcntl(fd, F_GETFD, 0);
249
125
/* If reading the flags failed, return error indication now. */
250
126
if(ret < 0){
251
127
return ret;
252
128
}
253
129
/* Store modified flag word in the descriptor. */
254
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
255
ret | FD_CLOEXEC));
130
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
256
131
}
257
132
258
259
/* Mark processes as completed when they exit, and save their exit
133
const char *argp_program_version = "plugbasedclient 0.9";
134
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
135
136
process *process_list = NULL;
137
138
/* Mark a process as completed when it exits, and save its exit
260
139
status. */
261
static void handle_sigchld(__attribute__((unused)) int sig){
262
int old_errno = errno;
263
while(true){
264
plugin *proc = plugin_list;
265
int status;
266
pid_t pid = waitpid(-1, &status, WNOHANG);
267
if(pid == 0){
268
/* Only still running child processes */
269
break;
270
}
271
if(pid == -1){
272
if(errno == ECHILD){
273
/* No child processes */
274
break;
275
}
276
error(0, errno, "waitpid");
277
}
278
279
/* A child exited, find it in process_list */
280
while(proc != NULL and proc->pid != pid){
281
proc = proc->next;
282
}
283
if(proc == NULL){
284
/* Process not found in process list */
285
continue;
286
}
287
proc->status = status;
288
proc->completed = 1;
289
}
290
errno = old_errno;
291
}
292
293
/* Prints out a password to stdout */
294
__attribute__((nonnull))
295
static bool print_out_password(const char *buffer, size_t length){
296
ssize_t ret;
297
for(size_t written = 0; written < length; written += (size_t)ret){
298
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
299
length - written));
300
if(ret < 0){
301
return false;
302
}
303
}
304
return true;
305
}
306
307
/* Removes and free a plugin from the plugin list */
308
__attribute__((nonnull))
309
static void free_plugin(plugin *plugin_node){
310
311
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
312
free(*arg);
313
}
314
free(plugin_node->argv);
315
for(char **env = plugin_node->environ; *env != NULL; env++){
316
free(*env);
317
}
318
free(plugin_node->environ);
319
free(plugin_node->buffer);
320
321
/* Removes the plugin from the singly-linked list */
322
if(plugin_node == plugin_list){
323
/* First one - simple */
324
plugin_list = plugin_list->next;
325
} else {
326
/* Second one or later */
327
for(plugin *p = plugin_list; p != NULL; p = p->next){
328
if(p->next == plugin_node){
329
p->next = plugin_node->next;
330
break;
331
}
332
}
333
}
334
335
free(plugin_node);
336
}
337
338
static void free_plugin_list(void){
339
while(plugin_list != NULL){
340
free_plugin(plugin_list);
341
}
140
void handle_sigchld(__attribute__((unused)) int sig){
141
process *proc = process_list;
142
int status;
143
pid_t pid = wait(&status);
144
while(proc != NULL and proc->pid != pid){
145
proc = proc->next;
146
}
147
if(proc == NULL){
148
/* Process not found in process list */
149
return;
150
}
151
proc->status = status;
152
proc->completed = true;
342
153
}
343
154
344
155
int main(int argc, char *argv[]){
345
char *plugindir = NULL;
346
char *argfile = NULL;
347
FILE *conffp;
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
348
157
size_t d_name_len;
349
158
DIR *dir = NULL;
350
159
struct dirent *dirst;
351
160
struct stat st;
352
161
fd_set rfds_all;
353
162
int ret, maxfd = 0;
354
ssize_t sret;
355
163
uid_t uid = 65534;
356
164
gid_t gid = 65534;
357
165
bool debug = false;
359
167
struct sigaction old_sigchld_action;
360
168
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
361
169
.sa_flags = SA_NOCLDSTOP };
362
char **custom_argv = NULL;
363
int custom_argc = 0;
170
char *plus_options = NULL;
171
char **plus_argv = NULL;
364
172
365
173
/* Establish a signal handler */
366
174
sigemptyset(&sigchld_action.sa_mask);
367
175
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
368
if(ret == -1){
369
error(0, errno, "sigaddset");
370
exitstatus = EX_OSERR;
371
goto fallback;
176
if(ret < 0){
177
perror("sigaddset");
178
exit(EXIT_FAILURE);
372
179
}
373
180
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
374
if(ret == -1){
375
error(0, errno, "sigaction");
376
exitstatus = EX_OSERR;
377
goto fallback;
181
if(ret < 0){
182
perror("sigaction");
183
exit(EXIT_FAILURE);
378
184
}
379
185
380
186
/* The options we understand. */
382
188
{ .name = "global-options", .key = 'g',
383
189
.arg = "OPTION[,OPTION[,...]]",
384
190
.doc = "Options passed to all plugins" },
385
{ .name = "global-env", .key = 'G',
386
.arg = "VAR=value",
387
.doc = "Environment variable passed to all plugins" },
388
191
{ .name = "options-for", .key = 'o',
389
192
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
390
193
.doc = "Options passed only to specified plugin" },
391
{ .name = "env-for", .key = 'E',
392
.arg = "PLUGIN:ENV=value",
393
.doc = "Environment variable passed to specified plugin" },
394
194
{ .name = "disable", .key = 'd',
395
195
.arg = "PLUGIN",
396
196
.doc = "Disable a specific plugin", .group = 1 },
397
{ .name = "enable", .key = 'e',
398
.arg = "PLUGIN",
399
.doc = "Enable a specific plugin", .group = 1 },
400
197
{ .name = "plugin-dir", .key = 128,
401
198
.arg = "DIRECTORY",
402
199
.doc = "Specify a different plugin directory", .group = 2 },
403
{ .name = "config-file", .key = 129,
404
.arg = "FILE",
405
.doc = "Specify a different configuration file", .group = 2 },
406
{ .name = "userid", .key = 130,
407
.arg = "ID", .flags = 0,
408
.doc = "User ID the plugins will run as", .group = 3 },
409
{ .name = "groupid", .key = 131,
410
.arg = "ID", .flags = 0,
411
.doc = "Group ID the plugins will run as", .group = 3 },
412
{ .name = "debug", .key = 132,
413
.doc = "Debug mode", .group = 4 },
414
/*
415
* These reproduce what we would get without ARGP_NO_HELP
416
*/
417
{ .name = "help", .key = '?',
418
.doc = "Give this help list", .group = -1 },
419
{ .name = "usage", .key = -3,
420
.doc = "Give a short usage message", .group = -1 },
421
{ .name = "version", .key = 'V',
422
.doc = "Print program version", .group = -1 },
200
{ .name = "userid", .key = 129,
201
.arg = "ID", .flags = 0,
202
.doc = "User ID the plugins will run as", .group = 2 },
203
{ .name = "groupid", .key = 130,
204
.arg = "ID", .flags = 0,
205
.doc = "Group ID the plugins will run as", .group = 2 },
206
{ .name = "debug", .key = 131,
207
.doc = "Debug mode", .group = 3 },
423
208
{ .name = NULL }
424
209
};
425
210
426
__attribute__((nonnull(3)))
427
error_t parse_opt(int key, char *arg, struct argp_state *state){
428
errno = 0;
429
switch(key){
430
char *tmp;
431
intmax_t tmp_id;
432
case 'g': /* --global-options */
433
{
434
char *plugin_option;
435
while((plugin_option = strsep(&arg, ",")) != NULL){
436
if(not add_argument(getplugin(NULL), plugin_option)){
437
break;
438
}
439
}
440
}
441
break;
442
case 'G': /* --global-env */
443
add_environment(getplugin(NULL), arg, true);
444
break;
445
case 'o': /* --options-for */
446
{
447
char *option_list = strchr(arg, ':');
448
if(option_list == NULL){
449
argp_error(state, "No colon in \"%s\"", arg);
450
errno = EINVAL;
451
break;
452
}
453
*option_list = '\0';
454
option_list++;
455
if(arg[0] == '\0'){
456
argp_error(state, "Empty plugin name");
457
errno = EINVAL;
458
break;
459
}
460
char *option;
461
while((option = strsep(&option_list, ",")) != NULL){
462
if(not add_argument(getplugin(arg), option)){
463
break;
464
}
465
}
466
}
467
break;
468
case 'E': /* --env-for */
469
{
470
char *envdef = strchr(arg, ':');
471
if(envdef == NULL){
472
argp_error(state, "No colon in \"%s\"", arg);
473
errno = EINVAL;
474
break;
475
}
476
*envdef = '\0';
477
envdef++;
478
if(arg[0] == '\0'){
479
argp_error(state, "Empty plugin name");
480
errno = EINVAL;
481
break;
482
}
483
add_environment(getplugin(arg), envdef, true);
484
}
485
break;
486
case 'd': /* --disable */
487
{
488
plugin *p = getplugin(arg);
489
if(p != NULL){
490
p->disabled = true;
491
}
492
}
493
break;
494
case 'e': /* --enable */
495
{
496
plugin *p = getplugin(arg);
497
if(p != NULL){
498
p->disabled = false;
499
}
500
}
501
break;
502
case 128: /* --plugin-dir */
503
free(plugindir);
504
plugindir = strdup(arg);
505
break;
506
case 129: /* --config-file */
507
/* This is already done by parse_opt_config_file() */
508
break;
509
case 130: /* --userid */
510
tmp_id = strtoimax(arg, &tmp, 10);
511
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmp_id != (uid_t)tmp_id){
513
argp_error(state, "Bad user ID number: \"%s\", using %"
514
PRIdMAX, arg, (intmax_t)uid);
515
break;
516
}
517
uid = (uid_t)tmp_id;
518
break;
519
case 131: /* --groupid */
520
tmp_id = strtoimax(arg, &tmp, 10);
521
if(errno != 0 or tmp == arg or *tmp != '\0'
522
or tmp_id != (gid_t)tmp_id){
523
argp_error(state, "Bad group ID number: \"%s\", using %"
524
PRIdMAX, arg, (intmax_t)gid);
525
break;
526
}
527
gid = (gid_t)tmp_id;
528
break;
529
case 132: /* --debug */
211
error_t parse_opt (int key, char *arg, struct argp_state *state) {
212
/* Get the INPUT argument from `argp_parse', which we know is a
213
pointer to our plugin list pointer. */
214
plugin **plugins = state->input;
215
switch (key) {
216
case 'g':
217
if (arg != NULL){
218
char *p = strtok(arg, ",");
219
do{
220
addargument(getplugin(NULL, plugins), p);
221
p = strtok(NULL, ",");
222
} while (p != NULL);
223
}
224
break;
225
case 'o':
226
if (arg != NULL){
227
char *name = strtok(arg, ":");
228
char *p = strtok(NULL, ":");
229
if(p != NULL){
230
p = strtok(p, ",");
231
do{
232
addargument(getplugin(name, plugins), p);
233
p = strtok(NULL, ",");
234
} while (p != NULL);
235
}
236
}
237
break;
238
case 'd':
239
if (arg != NULL){
240
getplugin(arg, plugins)->disabled = true;
241
}
242
break;
243
case 128:
244
plugindir = arg;
245
break;
246
case 129:
247
uid = (uid_t)strtol(arg, NULL, 10);
248
break;
249
case 130:
250
gid = (gid_t)strtol(arg, NULL, 10);
251
break;
252
case 131:
530
253
debug = true;
531
254
break;
532
/*
533
* These reproduce what we would get without ARGP_NO_HELP
534
*/
535
case '?': /* --help */
536
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
537
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
538
case -3: /* --usage */
539
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
540
argp_state_help(state, state->out_stream,
541
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
542
case 'V': /* --version */
543
fprintf(state->out_stream, "%s\n", argp_program_version);
544
exit(EXIT_SUCCESS);
545
break;
546
/*
547
* When adding more options before this line, remember to also add a
548
* "case" to the "parse_opt_config_file" function below.
549
*/
550
255
case ARGP_KEY_ARG:
551
/* Cryptsetup always passes an argument, which is an empty
552
string if "none" was specified in /etc/crypttab. So if
553
argument was empty, we ignore it silently. */
554
if(arg[0] == '\0'){
555
break;
256
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
257
argp_usage (state);
556
258
}
557
default:
558
return ARGP_ERR_UNKNOWN;
559
}
560
return errno; /* Set to 0 at start */
561
}
562
563
/* This option parser is the same as parse_opt() above, except it
564
ignores everything but the --config-file option. */
565
error_t parse_opt_config_file(int key, char *arg,
566
__attribute__((unused))
567
struct argp_state *state){
568
errno = 0;
569
switch(key){
570
case 'g': /* --global-options */
571
case 'G': /* --global-env */
572
case 'o': /* --options-for */
573
case 'E': /* --env-for */
574
case 'd': /* --disable */
575
case 'e': /* --enable */
576
case 128: /* --plugin-dir */
577
break;
578
case 129: /* --config-file */
579
free(argfile);
580
argfile = strdup(arg);
581
break;
582
case 130: /* --userid */
583
case 131: /* --groupid */
584
case 132: /* --debug */
585
case '?': /* --help */
586
case -3: /* --usage */
587
case 'V': /* --version */
588
case ARGP_KEY_ARG:
589
break;
590
default:
591
return ARGP_ERR_UNKNOWN;
592
}
593
return errno;
594
}
595
596
struct argp argp = { .options = options,
597
.parser = parse_opt_config_file,
598
.args_doc = "",
259
plus_options = arg;
260
break;
261
case ARGP_KEY_END:
262
break;
263
default:
264
return ARGP_ERR_UNKNOWN;
265
}
266
return 0;
267
}
268
269
plugin *plugin_list = NULL;
270
271
struct argp argp = { .options = options, .parser = parse_opt,
272
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
599
273
.doc = "Mandos plugin runner -- Run plugins" };
600
274
601
/* Parse using parse_opt_config_file() in order to get the custom
602
config file location, if any. */
603
ret = argp_parse(&argp, argc, argv,
604
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
605
NULL, NULL);
606
switch(ret){
607
case 0:
608
break;
609
case ENOMEM:
610
default:
611
errno = ret;
612
error(0, errno, "argp_parse");
613
exitstatus = EX_OSERR;
614
goto fallback;
615
case EINVAL:
616
exitstatus = EX_USAGE;
617
goto fallback;
618
}
619
620
/* Reset to the normal argument parser */
621
argp.parser = parse_opt;
622
623
/* Open the configfile if available */
624
if(argfile == NULL){
625
conffp = fopen(AFILE, "r");
626
} else {
627
conffp = fopen(argfile, "r");
628
}
629
if(conffp != NULL){
630
char *org_line = NULL;
631
char *p, *arg, *new_arg, *line;
632
size_t size = 0;
633
const char whitespace_delims[] = " \r\t\f\v\n";
634
const char comment_delim[] = "#";
635
636
custom_argc = 1;
637
custom_argv = malloc(sizeof(char*) * 2);
638
if(custom_argv == NULL){
639
error(0, errno, "malloc");
640
exitstatus = EX_OSERR;
641
goto fallback;
642
}
643
custom_argv[0] = argv[0];
644
custom_argv[1] = NULL;
645
646
/* for each line in the config file, strip whitespace and ignore
647
commented text */
648
while(true){
649
sret = getline(&org_line, &size, conffp);
650
if(sret == -1){
651
break;
652
}
653
654
line = org_line;
655
arg = strsep(&line, comment_delim);
656
while((p = strsep(&arg, whitespace_delims)) != NULL){
657
if(p[0] == '\0'){
658
continue;
659
}
660
new_arg = strdup(p);
661
if(new_arg == NULL){
662
error(0, errno, "strdup");
663
exitstatus = EX_OSERR;
664
free(org_line);
665
goto fallback;
666
}
667
668
custom_argc += 1;
669
{
670
char **new_argv = realloc(custom_argv, sizeof(char *)
671
* ((unsigned int)
672
custom_argc + 1));
673
if(new_argv == NULL){
674
error(0, errno, "realloc");
675
exitstatus = EX_OSERR;
676
free(new_arg);
677
free(org_line);
678
goto fallback;
679
} else {
680
custom_argv = new_argv;
681
}
682
}
683
custom_argv[custom_argc-1] = new_arg;
684
custom_argv[custom_argc] = NULL;
685
}
686
}
687
do {
688
ret = fclose(conffp);
689
} while(ret == EOF and errno == EINTR);
690
if(ret == EOF){
691
error(0, errno, "fclose");
692
exitstatus = EX_IOERR;
693
goto fallback;
694
}
695
free(org_line);
696
} else {
697
/* Check for harmful errors and go to fallback. Other errors might
698
not affect opening plugins */
699
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
700
error(0, errno, "fopen");
701
exitstatus = EX_OSERR;
702
goto fallback;
703
}
704
}
705
/* If there were any arguments from the configuration file, pass
706
them to parser as command line arguments */
707
if(custom_argv != NULL){
708
ret = argp_parse(&argp, custom_argc, custom_argv,
709
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
710
NULL, NULL);
711
switch(ret){
712
case 0:
713
break;
714
case ENOMEM:
715
default:
716
errno = ret;
717
error(0, errno, "argp_parse");
718
exitstatus = EX_OSERR;
719
goto fallback;
720
case EINVAL:
721
exitstatus = EX_CONFIG;
722
goto fallback;
723
}
724
}
725
726
/* Parse actual command line arguments, to let them override the
727
config file */
728
ret = argp_parse(&argp, argc, argv,
729
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
730
NULL, NULL);
731
switch(ret){
732
case 0:
733
break;
734
case ENOMEM:
735
default:
736
errno = ret;
737
error(0, errno, "argp_parse");
738
exitstatus = EX_OSERR;
739
goto fallback;
740
case EINVAL:
741
exitstatus = EX_USAGE;
742
goto fallback;
275
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
276
277
if(plus_options){
278
/* This is a mangled argument in the form of
279
"+--option+--other-option=parameter+--yet-another-option", etc */
280
/* Make new argc and argv vars, and call argp_parse() again. */
281
plus_options++; /* skip the first '+' character */
282
const char delims[] = "+";
283
char *arg;
284
int new_argc = 1;
285
plus_argv = malloc(sizeof(char*) * 2);
286
if(plus_argv == NULL){
287
perror("malloc");
288
exitstatus = EXIT_FAILURE;
289
goto end;
290
}
291
plus_argv[0] = argv[0];
292
plus_argv[1] = NULL;
293
arg = strtok(plus_options, delims); /* Get first argument */
294
while(arg != NULL){
295
new_argc++;
296
plus_argv = realloc(plus_argv, sizeof(char *)
297
* ((unsigned int) new_argc + 1));
298
if(plus_argv == NULL){
299
perror("malloc");
300
exitstatus = EXIT_FAILURE;
301
goto end;
302
}
303
plus_argv[new_argc-1] = arg;
304
plus_argv[new_argc] = NULL;
305
arg = strtok(NULL, delims); /* Get next argument */
306
}
307
argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
743
308
}
744
309
745
310
if(debug){
749
314
for(char **a = p->argv; *a != NULL; a++){
750
315
fprintf(stderr, "\tArg: %s\n", *a);
751
316
}
752
fprintf(stderr, "...and %d environment variables\n", p->envc);
753
for(char **a = p->environ; *a != NULL; a++){
754
fprintf(stderr, "\t%s\n", *a);
755
}
756
}
757
}
758
759
if(getuid() == 0){
760
/* Work around Debian bug #633582:
761
<http://bugs.debian.org/633582> */
762
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
763
if(plugindir_fd == -1){
764
error(0, errno, "open");
765
} else {
766
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
767
if(ret == -1){
768
error(0, errno, "fstat");
769
} else {
770
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
771
ret = fchown(plugindir_fd, uid, gid);
772
if(ret == -1){
773
error(0, errno, "fchown");
774
}
775
}
776
}
777
TEMP_FAILURE_RETRY(close(plugindir_fd));
778
}
779
}
780
781
/* Lower permissions */
782
ret = setgid(gid);
783
if(ret == -1){
784
error(0, errno, "setgid");
785
}
317
}
318
}
319
786
320
ret = setuid(uid);
787
if(ret == -1){
788
error(0, errno, "setuid");
789
}
790
791
/* Open plugin directory with close_on_exec flag */
321
if (ret == -1){
322
perror("setuid");
323
}
324
325
setgid(gid);
326
if (ret == -1){
327
perror("setgid");
328
}
329
330
dir = opendir(plugindir);
331
if(dir == NULL){
332
perror("Could not open plugin dir");
333
exitstatus = EXIT_FAILURE;
334
goto end;
335
}
336
337
/* Set the FD_CLOEXEC flag on the directory, if possible */
792
338
{
793
int dir_fd = -1;
794
if(plugindir == NULL){
795
dir_fd = open(PDIR, O_RDONLY |
796
#ifdef O_CLOEXEC
797
O_CLOEXEC
798
#else /* not O_CLOEXEC */
799
0
800
#endif /* not O_CLOEXEC */
801
);
802
} else {
803
dir_fd = open(plugindir, O_RDONLY |
804
#ifdef O_CLOEXEC
805
O_CLOEXEC
806
#else /* not O_CLOEXEC */
807
0
808
#endif /* not O_CLOEXEC */
809
);
810
}
811
if(dir_fd == -1){
812
error(0, errno, "Could not open plugin dir");
813
exitstatus = EX_UNAVAILABLE;
814
goto fallback;
815
}
816
817
#ifndef O_CLOEXEC
818
/* Set the FD_CLOEXEC flag on the directory */
819
ret = set_cloexec_flag(dir_fd);
820
if(ret < 0){
821
error(0, errno, "set_cloexec_flag");
822
TEMP_FAILURE_RETRY(close(dir_fd));
823
exitstatus = EX_OSERR;
824
goto fallback;
825
}
826
#endif /* O_CLOEXEC */
827
828
dir = fdopendir(dir_fd);
829
if(dir == NULL){
830
error(0, errno, "Could not open plugin dir");
831
TEMP_FAILURE_RETRY(close(dir_fd));
832
exitstatus = EX_OSERR;
833
goto fallback;
339
int dir_fd = dirfd(dir);
340
if(dir_fd >= 0){
341
ret = set_cloexec_flag(dir_fd);
342
if(ret < 0){
343
perror("set_cloexec_flag");
344
exitstatus = EXIT_FAILURE;
345
goto end;
346
}
834
347
}
835
348
}
836
349
837
350
FD_ZERO(&rfds_all);
838
351
839
/* Read and execute any executable in the plugin directory*/
840
352
while(true){
841
do {
842
dirst = readdir(dir);
843
} while(dirst == NULL and errno == EINTR);
353
dirst = readdir(dir);
844
354
845
/* All directory entries have been processed */
355
// All directory entries have been processed
846
356
if(dirst == NULL){
847
if(errno == EBADF){
848
error(0, errno, "readdir");
849
exitstatus = EX_IOERR;
850
goto fallback;
851
}
852
357
break;
853
358
}
854
359
855
360
d_name_len = strlen(dirst->d_name);
856
361
857
/* Ignore dotfiles, backup files and other junk */
362
// Ignore dotfiles, backup files and other junk
858
363
{
859
364
bool bad_name = false;
860
365
861
const char * const bad_prefixes[] = { ".", "#", NULL };
366
const char const *bad_prefixes[] = { ".", "#", NULL };
862
367
863
const char * const bad_suffixes[] = { "~", "#", ".dpkg-new",
368
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
864
369
".dpkg-old",
865
".dpkg-bak",
866
370
".dpkg-divert", NULL };
867
#ifdef __GNUC__
868
#pragma GCC diagnostic push
869
#pragma GCC diagnostic ignored "-Wcast-qual"
870
#endif
871
for(const char **pre = (const char **)bad_prefixes;
872
*pre != NULL; pre++){
873
#ifdef __GNUC__
874
#pragma GCC diagnostic pop
875
#endif
371
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
876
372
size_t pre_len = strlen(*pre);
877
373
if((d_name_len >= pre_len)
878
374
and strncmp((dirst->d_name), *pre, pre_len) == 0){
884
380
break;
885
381
}
886
382
}
383
887
384
if(bad_name){
888
385
continue;
889
386
}
890
#ifdef __GNUC__
891
#pragma GCC diagnostic push
892
#pragma GCC diagnostic ignored "-Wcast-qual"
893
#endif
894
for(const char **suf = (const char **)bad_suffixes;
895
*suf != NULL; suf++){
896
#ifdef __GNUC__
897
#pragma GCC diagnostic pop
898
#endif
387
388
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
899
389
size_t suf_len = strlen(*suf);
900
390
if((d_name_len >= suf_len)
901
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
391
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
902
392
== 0)){
903
393
if(debug){
904
394
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
914
404
}
915
405
}
916
406
917
char *filename;
918
if(plugindir == NULL){
919
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
920
dirst->d_name));
921
} else {
922
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
923
plugindir,
924
dirst->d_name));
925
}
926
if(ret < 0){
927
error(0, errno, "asprintf");
928
continue;
929
}
930
931
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
932
if(ret == -1){
933
error(0, errno, "stat");
934
free(filename);
935
continue;
936
}
937
938
/* Ignore non-executable files */
939
if(not S_ISREG(st.st_mode)
940
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
407
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
408
if (filename == NULL){
409
perror("malloc");
410
exitstatus = EXIT_FAILURE;
411
goto end;
412
}
413
strcpy(filename, plugindir); /* Spurious warning */
414
strcat(filename, "/"); /* Spurious warning */
415
strcat(filename, dirst->d_name); /* Spurious warning */
416
417
stat(filename, &st);
418
419
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
941
420
if(debug){
942
421
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
943
422
" with bad type or mode\n", filename);
945
424
free(filename);
946
425
continue;
947
426
}
948
949
plugin *p = getplugin(dirst->d_name);
950
if(p == NULL){
951
error(0, errno, "getplugin");
952
free(filename);
953
continue;
954
}
955
if(p->disabled){
427
if(getplugin(dirst->d_name, &plugin_list)->disabled){
956
428
if(debug){
957
429
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
958
430
dirst->d_name);
960
432
free(filename);
961
433
continue;
962
434
}
435
plugin *p = getplugin(dirst->d_name, &plugin_list);
963
436
{
964
437
/* Add global arguments to argument list for this plugin */
965
plugin *g = getplugin(NULL);
966
if(g != NULL){
967
for(char **a = g->argv + 1; *a != NULL; a++){
968
if(not add_argument(p, *a)){
969
error(0, errno, "add_argument");
970
}
971
}
972
/* Add global environment variables */
973
for(char **e = g->environ; *e != NULL; e++){
974
if(not add_environment(p, *e, false)){
975
error(0, errno, "add_environment");
976
}
977
}
978
}
979
}
980
/* If this plugin has any environment variables, we will call
981
using execve and need to duplicate the environment from this
982
process, too. */
983
if(p->environ[0] != NULL){
984
for(char **e = environ; *e != NULL; e++){
985
if(not add_environment(p, *e, false)){
986
error(0, errno, "add_environment");
987
}
988
}
989
}
990
991
int pipefd[2];
992
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
993
if(ret == -1){
994
error(0, errno, "pipe");
995
exitstatus = EX_OSERR;
996
goto fallback;
997
}
998
/* Ask OS to automatic close the pipe on exec */
438
plugin *g = getplugin(NULL, &plugin_list);
439
for(char **a = g->argv + 1; *a != NULL; a++){
440
addargument(p, *a);
441
}
442
}
443
int pipefd[2];
444
ret = pipe(pipefd);
445
if (ret == -1){
446
perror("pipe");
447
exitstatus = EXIT_FAILURE;
448
goto end;
449
}
999
450
ret = set_cloexec_flag(pipefd[0]);
1000
451
if(ret < 0){
1001
error(0, errno, "set_cloexec_flag");
1002
exitstatus = EX_OSERR;
1003
goto fallback;
452
perror("set_cloexec_flag");
453
exitstatus = EXIT_FAILURE;
454
goto end;
1004
455
}
1005
456
ret = set_cloexec_flag(pipefd[1]);
1006
457
if(ret < 0){
1007
error(0, errno, "set_cloexec_flag");
1008
exitstatus = EX_OSERR;
1009
goto fallback;
458
perror("set_cloexec_flag");
459
exitstatus = EXIT_FAILURE;
460
goto end;
1010
461
}
1011
462
/* Block SIGCHLD until process is safely in process list */
1012
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1013
&sigchld_action.sa_mask,
1014
NULL));
463
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1015
464
if(ret < 0){
1016
error(0, errno, "sigprocmask");
1017
exitstatus = EX_OSERR;
1018
goto fallback;
1019
}
1020
/* Starting a new process to be watched */
1021
pid_t pid;
1022
do {
1023
pid = fork();
1024
} while(pid == -1 and errno == EINTR);
1025
if(pid == -1){
1026
error(0, errno, "fork");
1027
exitstatus = EX_OSERR;
1028
goto fallback;
1029
}
465
perror("sigprocmask");
466
exitstatus = EXIT_FAILURE;
467
goto end;
468
}
469
// Starting a new process to be watched
470
pid_t pid = fork();
1030
471
if(pid == 0){
1031
472
/* this is the child process */
1032
473
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1033
474
if(ret < 0){
1034
error(0, errno, "sigaction");
1035
_exit(EX_OSERR);
475
perror("sigaction");
476
_exit(EXIT_FAILURE);
1036
477
}
1037
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
478
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1038
479
if(ret < 0){
1039
error(0, errno, "sigprocmask");
1040
_exit(EX_OSERR);
1041
}
1042
1043
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1044
if(ret == -1){
1045
error(0, errno, "dup2");
1046
_exit(EX_OSERR);
1047
}
480
perror("sigprocmask");
481
_exit(EXIT_FAILURE);
482
}
483
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1048
484
1049
485
if(dirfd(dir) < 0){
1050
486
/* If dir has no file descriptor, we could not set FD_CLOEXEC
1051
487
above and must now close it manually here. */
1052
488
closedir(dir);
1053
489
}
1054
if(p->environ[0] == NULL){
1055
if(execv(filename, p->argv) < 0){
1056
error(0, errno, "execv for %s", filename);
1057
_exit(EX_OSERR);
1058
}
1059
} else {
1060
if(execve(filename, p->argv, p->environ) < 0){
1061
error(0, errno, "execve for %s", filename);
1062
_exit(EX_OSERR);
1063
}
490
if(execv(filename, p->argv) < 0){
491
perror("execv");
492
_exit(EXIT_FAILURE);
1064
493
}
1065
494
/* no return */
1066
495
}
1067
/* Parent process */
1068
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1069
pipe */
496
/* parent process */
1070
497
free(filename);
1071
plugin *new_plugin = getplugin(dirst->d_name);
1072
if(new_plugin == NULL){
1073
error(0, errno, "getplugin");
1074
ret = (int)(TEMP_FAILURE_RETRY
1075
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1076
NULL)));
498
close(pipefd[1]); /* close unused write end of pipe */
499
process *new_process = malloc(sizeof(process));
500
if (new_process == NULL){
501
perror("malloc");
502
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1077
503
if(ret < 0){
1078
error(0, errno, "sigprocmask");
504
perror("sigprocmask");
1079
505
}
1080
exitstatus = EX_OSERR;
1081
goto fallback;
506
exitstatus = EXIT_FAILURE;
507
goto end;
1082
508
}
1083
509
1084
new_plugin->pid = pid;
1085
new_plugin->fd = pipefd[0];
1086
510
*new_process = (struct process){ .pid = pid,
511
.fd = pipefd[0],
512
.next = process_list };
513
// List handling
514
process_list = new_process;
1087
515
/* Unblock SIGCHLD so signal handler can be run if this process
1088
516
has already completed */
1089
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1090
&sigchld_action.sa_mask,
1091
NULL));
517
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1092
518
if(ret < 0){
1093
error(0, errno, "sigprocmask");
1094
exitstatus = EX_OSERR;
1095
goto fallback;
1096
}
1097
1098
#if defined (__GNUC__) and defined (__GLIBC__)
1099
#if not __GLIBC_PREREQ(2, 16)
1100
#pragma GCC diagnostic push
1101
#pragma GCC diagnostic ignored "-Wsign-conversion"
1102
#endif
1103
#endif
1104
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion in GNU libc
1106
before 2.16 */
1107
#if defined (__GNUC__) and defined (__GLIBC__)
1108
#if not __GLIBC_PREREQ(2, 16)
1109
#pragma GCC diagnostic pop
1110
#endif
1111
#endif
1112
1113
if(maxfd < new_plugin->fd){
1114
maxfd = new_plugin->fd;
1115
}
1116
}
1117
1118
TEMP_FAILURE_RETRY(closedir(dir));
519
perror("sigprocmask");
520
exitstatus = EXIT_FAILURE;
521
goto end;
522
}
523
524
FD_SET(new_process->fd, &rfds_all);
525
526
if (maxfd < new_process->fd){
527
maxfd = new_process->fd;
528
}
529
530
}
531
532
/* Free the plugin list */
533
for(plugin *next; plugin_list != NULL; plugin_list = next){
534
next = plugin_list->next;
535
free(plugin_list->argv);
536
free(plugin_list);
537
}
538
539
closedir(dir);
1119
540
dir = NULL;
1120
free_plugin(getplugin(NULL));
1121
541
1122
for(plugin *p = plugin_list; p != NULL; p = p->next){
1123
if(p->pid != 0){
1124
break;
1125
}
1126
if(p->next == NULL){
1127
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1128
" directory?\n");
1129
free_plugin_list();
1130
}
542
if (process_list == NULL){
543
fprintf(stderr, "No plugin processes started, exiting\n");
544
exitstatus = EXIT_FAILURE;
545
goto end;
1131
546
}
1132
1133
/* Main loop while running plugins exist */
1134
while(plugin_list){
547
while(process_list){
1135
548
fd_set rfds = rfds_all;
1136
549
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1137
if(select_ret == -1 and errno != EINTR){
1138
error(0, errno, "select");
1139
exitstatus = EX_OSERR;
1140
goto fallback;
550
if (select_ret == -1){
551
perror("select");
552
exitstatus = EXIT_FAILURE;
553
goto end;
1141
554
}
1142
555
/* OK, now either a process completed, or something can be read
1143
556
from one of them */
1144
for(plugin *proc = plugin_list; proc != NULL;){
557
for(process *proc = process_list; proc ; proc = proc->next){
1145
558
/* Is this process completely done? */
1146
if(proc->completed and proc->eof){
559
if(proc->eof and proc->completed){
1147
560
/* Only accept the plugin output if it exited cleanly */
1148
561
if(not WIFEXITED(proc->status)
1149
562
or WEXITSTATUS(proc->status) != 0){
1150
563
/* Bad exit by plugin */
1151
1152
564
if(debug){
1153
565
if(WIFEXITED(proc->status)){
1154
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1155
" status %d\n", proc->name,
1156
(intmax_t) (proc->pid),
1157
WEXITSTATUS(proc->status));
1158
} else if(WIFSIGNALED(proc->status)){
1159
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1160
" signal %d: %s\n", proc->name,
1161
(intmax_t) (proc->pid),
1162
WTERMSIG(proc->status),
1163
strsignal(WTERMSIG(proc->status)));
566
fprintf(stderr, "Plugin %d exited with status %d\n",
567
proc->pid, WEXITSTATUS(proc->status));
568
} else if(WIFSIGNALED(proc->status)) {
569
fprintf(stderr, "Plugin %d killed by signal %d\n",
570
proc->pid, WTERMSIG(proc->status));
1164
571
} else if(WCOREDUMP(proc->status)){
1165
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1166
" core\n", proc->name, (intmax_t) (proc->pid));
572
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
1167
573
}
1168
574
}
1169
1170
575
/* Remove the plugin */
1171
#if defined (__GNUC__) and defined (__GLIBC__)
1172
#if not __GLIBC_PREREQ(2, 16)
1173
#pragma GCC diagnostic push
1174
#pragma GCC diagnostic ignored "-Wsign-conversion"
1175
#endif
1176
#endif
1177
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1178
-Wconversion in GNU libc
1179
before 2.16 */
1180
#if defined (__GNUC__) and defined (__GLIBC__)
1181
#if not __GLIBC_PREREQ(2, 16)
1182
#pragma GCC diagnostic pop
1183
#endif
1184
#endif
1185
576
FD_CLR(proc->fd, &rfds_all);
1186
577
/* Block signal while modifying process_list */
1187
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1188
(SIG_BLOCK,
1189
&sigchld_action.sa_mask,
1190
NULL));
578
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1191
579
if(ret < 0){
1192
error(0, errno, "sigprocmask");
1193
exitstatus = EX_OSERR;
1194
goto fallback;
1195
}
1196
1197
plugin *next_plugin = proc->next;
1198
free_plugin(proc);
1199
proc = next_plugin;
1200
580
perror("sigprocmask");
581
exitstatus = EXIT_FAILURE;
582
goto end;
583
}
584
/* Delete this process entry from the list */
585
if(process_list == proc){
586
/* First one - simple */
587
process_list = proc->next;
588
} else {
589
/* Second one or later */
590
for(process *p = process_list; p != NULL; p = p->next){
591
if(p->next == proc){
592
p->next = proc->next;
593
break;
594
}
595
}
596
}
1201
597
/* We are done modifying process list, so unblock signal */
1202
ret = (int)(TEMP_FAILURE_RETRY
1203
(sigprocmask(SIG_UNBLOCK,
1204
&sigchld_action.sa_mask, NULL)));
598
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
599
NULL);
1205
600
if(ret < 0){
1206
error(0, errno, "sigprocmask");
1207
exitstatus = EX_OSERR;
1208
goto fallback;
1209
}
1210
1211
if(plugin_list == NULL){
1212
break;
1213
}
1214
1215
continue;
601
perror("sigprocmask");
602
}
603
free(proc->buffer);
604
free(proc);
605
/* We deleted this process from the list, so we can't go
606
proc->next. Therefore, start over from the beginning of
607
the process list */
608
break;
1216
609
}
1217
1218
610
/* This process exited nicely, so print its buffer */
1219
1220
bool bret = print_out_password(proc->buffer,
1221
proc->buffer_length);
1222
if(not bret){
1223
error(0, errno, "print_out_password");
1224
exitstatus = EX_IOERR;
611
for(size_t written = 0; written < proc->buffer_length;
612
written += (size_t)ret){
613
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
614
proc->buffer + written,
615
proc->buffer_length
616
- written));
617
if(ret < 0){
618
perror("write");
619
exitstatus = EXIT_FAILURE;
620
goto end;
621
}
1225
622
}
1226
goto fallback;
623
goto end;
1227
624
}
1228
1229
625
/* This process has not completed. Does it have any output? */
1230
#if defined (__GNUC__) and defined (__GLIBC__)
1231
#if not __GLIBC_PREREQ(2, 16)
1232
#pragma GCC diagnostic push
1233
#pragma GCC diagnostic ignored "-Wsign-conversion"
1234
#endif
1235
#endif
1236
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1237
warning from
1238
-Wconversion
1239
in GNU libc
1240
before
1241
2.16 */
1242
#if defined (__GNUC__) and defined (__GLIBC__)
1243
#if not __GLIBC_PREREQ(2, 16)
1244
#pragma GCC diagnostic pop
1245
#endif
1246
#endif
626
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1247
627
/* This process had nothing to say at this time */
1248
proc = proc->next;
1249
628
continue;
1250
629
}
1251
630
/* Before reading, make the process' data buffer large enough */
1252
631
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1253
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1254
+ (size_t) BUFFER_SIZE);
1255
if(new_buffer == NULL){
1256
error(0, errno, "malloc");
1257
exitstatus = EX_OSERR;
1258
goto fallback;
632
proc->buffer = realloc(proc->buffer, proc->buffer_size
633
+ (size_t) BUFFER_SIZE);
634
if (proc->buffer == NULL){
635
perror("malloc");
636
exitstatus = EXIT_FAILURE;
637
goto end;
1259
638
}
1260
proc->buffer = new_buffer;
1261
639
proc->buffer_size += BUFFER_SIZE;
1262
640
}
1263
641
/* Read from the process */
1264
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1265
proc->buffer
1266
+ proc->buffer_length,
1267
BUFFER_SIZE));
1268
if(sret < 0){
642
ret = read(proc->fd, proc->buffer + proc->buffer_length,
643
BUFFER_SIZE);
644
if(ret < 0){
1269
645
/* Read error from this process; ignore the error */
1270
proc = proc->next;
1271
646
continue;
1272
647
}
1273
if(sret == 0){
648
if(ret == 0){
1274
649
/* got EOF */
1275
650
proc->eof = true;
1276
651
} else {
1277
proc->buffer_length += (size_t) sret;
652
proc->buffer_length += (size_t) ret;
1278
653
}
1279
654
}
1280
655
}
1281
1282
1283
fallback:
1284
1285
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1286
and exitstatus != EX_OK)){
1287
/* Fallback if all plugins failed, none are found or an error
1288
occured */
1289
bool bret;
1290
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1291
char *passwordbuffer = getpass("Password: ");
1292
size_t len = strlen(passwordbuffer);
1293
/* Strip trailing newline */
1294
if(len > 0 and passwordbuffer[len-1] == '\n'){
1295
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1296
len--;
1297
}
1298
bret = print_out_password(passwordbuffer, len);
1299
if(not bret){
1300
error(0, errno, "print_out_password");
1301
exitstatus = EX_IOERR;
1302
}
656
if(process_list == NULL){
657
fprintf(stderr, "All plugin processes failed, exiting\n");
658
exitstatus = EXIT_FAILURE;
1303
659
}
1304
660
661
end:
1305
662
/* Restore old signal handler */
1306
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1307
if(ret == -1){
1308
error(0, errno, "sigaction");
1309
exitstatus = EX_OSERR;
1310
}
1311
1312
if(custom_argv != NULL){
1313
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1314
free(*arg);
1315
}
1316
free(custom_argv);
663
sigaction(SIGCHLD, &old_sigchld_action, NULL);
664
665
free(plus_argv);
666
667
/* Free the plugin list */
668
for(plugin *next; plugin_list != NULL; plugin_list = next){
669
next = plugin_list->next;
670
free(plugin_list->argv);
671
free(plugin_list);
1317
672
}
1318
673
1319
674
if(dir != NULL){
1320
675
closedir(dir);
1321
676
}
1322
677
1323
/* Kill the processes */
1324
for(plugin *p = plugin_list; p != NULL; p = p->next){
1325
if(p->pid != 0){
1326
close(p->fd);
1327
ret = kill(p->pid, SIGTERM);
1328
if(ret == -1 and errno != ESRCH){
1329
/* Set-uid proccesses might not get closed */
1330
error(0, errno, "kill");
1331
}
1332
}
678
/* Free the process list and kill the processes */
679
for(process *next; process_list != NULL; process_list = next){
680
next = process_list->next;
681
close(process_list->fd);
682
kill(process_list->pid, SIGTERM);
683
free(process_list->buffer);
684
free(process_list);
1333
685
}
1334
686
1335
687
/* Wait for any remaining child processes to terminate */
1336
do {
688
do{
1337
689
ret = wait(NULL);
1338
690
} while(ret >= 0);
1339
691
if(errno != ECHILD){
1340
error(0, errno, "wait");
692
perror("wait");
1341
693
}
1342
694
1343
free_plugin_list();
1344
1345
free(plugindir);
1346
free(argfile);
1347
1348
695
return exitstatus;
1349
696
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0