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- Committer: Teddy Hogeborn
- Date: 2011-11-24 20:15:24 UTC
- mto: (505.2.8 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111124201524-5w9ovzpuw3drdlgf
* network-hooks.d: New directory.
* network-hooks.d/bridge: New example hook.
* network-hooks.d/bridge.conf: Config file for bridge example hook.
* network-hooks.d/bridge: New example hook.
* network-hooks.d/bridge.conf: Config file for bridge example hook.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- server.conf => mandos.conf
- plugbasedclient.c => plugin-runner.c
- plugins.d/mandosclient.c => plugins.d/mandos-client.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- files modified:
- Makefile
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 © 2008-2011 Teddy Hogeborn
6
* Copyright © 2008-2011 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
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
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(),
27
32
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() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
28
44
#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() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
readdir(), closedir(), dirfd() */
37
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
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() */
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() */
48
58
#include <errno.h> /* errno */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
52
53
struct process;
54
55
typedef struct process{
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() */
75
76
#define BUFFER_SIZE 256
77
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*/
56
93
pid_t pid;
57
94
int fd;
58
95
char *buffer;
59
96
size_t buffer_size;
60
97
size_t buffer_length;
61
98
bool eof;
62
bool completed;
99
volatile sig_atomic_t completed;
63
100
int status;
64
struct process *next;
65
} process;
66
67
typedef struct plugin{
68
char *name; /* can be NULL or any plugin name */
69
char **argv;
70
int argc;
71
bool disabled;
72
101
struct plugin *next;
73
102
} plugin;
74
103
75
plugin *getplugin(char *name, plugin **plugin_list){
76
for (plugin *p = *plugin_list; p != NULL; p = p->next){
77
if ((p->name == name)
78
or (p->name and name and (strcmp(p->name, name) == 0))){
104
static plugin *plugin_list = NULL;
105
106
/* Gets an existing plugin based on name,
107
or if none is found, creates a new one */
108
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
if((p->name == name)
112
or (p->name and name and (strcmp(p->name, name) == 0))){
79
113
return p;
80
114
}
81
115
}
82
116
/* Create a new plugin */
83
plugin *new_plugin = malloc(sizeof(plugin));
84
if (new_plugin == NULL){
85
perror("malloc");
86
exit(EXIT_FAILURE);
87
}
88
new_plugin->name = name;
89
new_plugin->argv = malloc(sizeof(char *) * 2);
90
if (new_plugin->argv == NULL){
91
perror("malloc");
92
exit(EXIT_FAILURE);
93
}
94
new_plugin->argv[0] = name;
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;
95
153
new_plugin->argv[1] = NULL;
96
new_plugin->argc = 1;
97
new_plugin->disabled = false;
98
new_plugin->next = *plugin_list;
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
99
168
/* Append the new plugin to the list */
100
*plugin_list = new_plugin;
169
plugin_list = new_plugin;
101
170
return new_plugin;
102
171
}
103
172
104
void addargument(plugin *p, char *arg){
105
p->argv[p->argc] = arg;
106
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
107
if (p->argv == NULL){
108
perror("malloc");
109
exit(EXIT_FAILURE);
110
}
111
p->argc++;
112
p->argv[p->argc] = NULL;
173
/* Helper function for add_argument and add_environment */
174
static bool add_to_char_array(const char *new, char ***array,
175
int *len){
176
/* Resize the pointed-to array to hold one more pointer */
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
181
/* Malloc check */
182
if(*array == NULL){
183
return false;
184
}
185
/* Make a copy of the new string */
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
190
if(copy == NULL){
191
return false;
192
}
193
/* Insert the copy */
194
(*array)[*len] = copy;
195
(*len)++;
196
/* Add a new terminating NULL pointer to the last element */
197
(*array)[*len] = NULL;
198
return true;
199
}
200
201
/* Add to a plugin's argument vector */
202
static bool add_argument(plugin *p, const char *arg){
203
if(p == NULL){
204
return false;
205
}
206
return add_to_char_array(arg, &(p->argv), &(p->argc));
207
}
208
209
/* Add to a plugin's environment */
210
static bool add_environment(plugin *p, const char *def, bool replace){
211
if(p == NULL){
212
return false;
213
}
214
/* namelen = length of name of environment variable */
215
size_t namelen = (size_t)(strchrnul(def, '=') - def);
216
/* Search for this environment variable */
217
for(char **e = p->environ; *e != NULL; e++){
218
if(strncmp(*e, def, namelen + 1) == 0){
219
/* It already exists */
220
if(replace){
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
225
if(new == NULL){
226
return false;
227
}
228
*e = new;
229
strcpy(*e, def);
230
}
231
return true;
232
}
233
}
234
return add_to_char_array(def, &(p->environ), &(p->envc));
113
235
}
114
236
115
237
/*
116
238
* Based on the example in the GNU LibC manual chapter 13.13 "File
117
239
* Descriptor Flags".
118
* *Note File Descriptor Flags:(libc)Descriptor Flags.
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
119
241
*/
120
int set_cloexec_flag(int fd)
121
{
122
int ret = fcntl(fd, F_GETFD, 0);
242
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
123
244
/* If reading the flags failed, return error indication now. */
124
245
if(ret < 0){
125
246
return ret;
126
247
}
127
248
/* Store modified flag word in the descriptor. */
128
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
129
251
}
130
252
131
#define BUFFER_SIZE 256
132
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
253
254
/* Mark processes as completed when they exit, and save their exit
139
255
status. */
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;
256
static void handle_sigchld(__attribute__((unused)) int sig){
257
int old_errno = errno;
258
while(true){
259
plugin *proc = plugin_list;
260
int status;
261
pid_t pid = waitpid(-1, &status, WNOHANG);
262
if(pid == 0){
263
/* Only still running child processes */
264
break;
265
}
266
if(pid == -1){
267
if(errno == ECHILD){
268
/* No child processes */
269
break;
270
}
271
error(0, errno, "waitpid");
272
}
273
274
/* A child exited, find it in process_list */
275
while(proc != NULL and proc->pid != pid){
276
proc = proc->next;
277
}
278
if(proc == NULL){
279
/* Process not found in process list */
280
continue;
281
}
282
proc->status = status;
283
proc->completed = 1;
284
}
285
errno = old_errno;
286
}
287
288
/* Prints out a password to stdout */
289
static bool print_out_password(const char *buffer, size_t length){
290
ssize_t ret;
291
for(size_t written = 0; written < length; written += (size_t)ret){
292
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
293
length - written));
294
if(ret < 0){
295
return false;
296
}
297
}
298
return true;
299
}
300
301
/* Removes and free a plugin from the plugin list */
302
static void free_plugin(plugin *plugin_node){
303
304
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
305
free(*arg);
306
}
307
free(plugin_node->argv);
308
for(char **env = plugin_node->environ; *env != NULL; env++){
309
free(*env);
310
}
311
free(plugin_node->environ);
312
free(plugin_node->buffer);
313
314
/* Removes the plugin from the singly-linked list */
315
if(plugin_node == plugin_list){
316
/* First one - simple */
317
plugin_list = plugin_list->next;
318
} else {
319
/* Second one or later */
320
for(plugin *p = plugin_list; p != NULL; p = p->next){
321
if(p->next == plugin_node){
322
p->next = plugin_node->next;
323
break;
324
}
325
}
326
}
327
328
free(plugin_node);
329
}
330
331
static void free_plugin_list(void){
332
while(plugin_list != NULL){
333
free_plugin(plugin_list);
334
}
153
335
}
154
336
155
337
int main(int argc, char *argv[]){
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
338
char *plugindir = NULL;
339
char *argfile = NULL;
340
FILE *conffp;
157
341
size_t d_name_len;
158
342
DIR *dir = NULL;
159
343
struct dirent *dirst;
160
344
struct stat st;
161
345
fd_set rfds_all;
162
346
int ret, maxfd = 0;
347
ssize_t sret;
348
uid_t uid = 65534;
349
gid_t gid = 65534;
163
350
bool debug = false;
164
351
int exitstatus = EXIT_SUCCESS;
352
struct sigaction old_sigchld_action;
353
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
354
.sa_flags = SA_NOCLDSTOP };
355
char **custom_argv = NULL;
356
int custom_argc = 0;
165
357
166
358
/* Establish a signal handler */
167
struct sigaction old_sigchld_action,
168
sigchld_action = { .sa_handler = handle_sigchld,
169
.sa_flags = SA_NOCLDSTOP };
170
359
sigemptyset(&sigchld_action.sa_mask);
171
360
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
172
if(ret < 0){
173
perror("sigaddset");
174
exit(EXIT_FAILURE);
361
if(ret == -1){
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
364
goto fallback;
175
365
}
176
366
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
177
if(ret < 0){
178
perror("sigaction");
179
exit(EXIT_FAILURE);
367
if(ret == -1){
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
370
goto fallback;
180
371
}
181
372
182
373
/* The options we understand. */
184
375
{ .name = "global-options", .key = 'g',
185
376
.arg = "OPTION[,OPTION[,...]]",
186
377
.doc = "Options passed to all plugins" },
378
{ .name = "global-env", .key = 'G',
379
.arg = "VAR=value",
380
.doc = "Environment variable passed to all plugins" },
187
381
{ .name = "options-for", .key = 'o',
188
382
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
189
383
.doc = "Options passed only to specified plugin" },
384
{ .name = "env-for", .key = 'E',
385
.arg = "PLUGIN:ENV=value",
386
.doc = "Environment variable passed to specified plugin" },
190
387
{ .name = "disable", .key = 'd',
191
388
.arg = "PLUGIN",
192
389
.doc = "Disable a specific plugin", .group = 1 },
390
{ .name = "enable", .key = 'e',
391
.arg = "PLUGIN",
392
.doc = "Enable a specific plugin", .group = 1 },
193
393
{ .name = "plugin-dir", .key = 128,
194
394
.arg = "DIRECTORY",
195
395
.doc = "Specify a different plugin directory", .group = 2 },
196
{ .name = "debug", .key = 129,
197
.doc = "Debug mode", .group = 3 },
396
{ .name = "config-file", .key = 129,
397
.arg = "FILE",
398
.doc = "Specify a different configuration file", .group = 2 },
399
{ .name = "userid", .key = 130,
400
.arg = "ID", .flags = 0,
401
.doc = "User ID the plugins will run as", .group = 3 },
402
{ .name = "groupid", .key = 131,
403
.arg = "ID", .flags = 0,
404
.doc = "Group ID the plugins will run as", .group = 3 },
405
{ .name = "debug", .key = 132,
406
.doc = "Debug mode", .group = 4 },
407
/*
408
* These reproduce what we would get without ARGP_NO_HELP
409
*/
410
{ .name = "help", .key = '?',
411
.doc = "Give this help list", .group = -1 },
412
{ .name = "usage", .key = -3,
413
.doc = "Give a short usage message", .group = -1 },
414
{ .name = "version", .key = 'V',
415
.doc = "Print program version", .group = -1 },
198
416
{ .name = NULL }
199
417
};
200
418
201
error_t parse_opt (int key, char *arg, struct argp_state *state) {
202
/* Get the INPUT argument from `argp_parse', which we know is a
203
pointer to our plugin list pointer. */
204
plugin **plugins = state->input;
205
switch (key) {
206
case 'g':
207
if (arg != NULL){
208
char *p = strtok(arg, ",");
209
do{
210
addargument(getplugin(NULL, plugins), p);
211
p = strtok(NULL, ",");
212
} while (p);
213
}
214
break;
215
case 'o':
216
if (arg != NULL){
217
char *name = strtok(arg, ":");
218
char *p = strtok(NULL, ":");
219
if(p){
220
p = strtok(p, ",");
221
do{
222
addargument(getplugin(name, plugins), p);
223
p = strtok(NULL, ",");
224
} while (p);
225
}
226
}
227
break;
228
case 'd':
229
if (arg != NULL){
230
getplugin(arg, plugins)->disabled = true;
231
}
232
break;
233
case 128:
234
plugindir = arg;
235
break;
236
case 129:
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
421
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
424
case 'g': /* --global-options */
425
{
426
char *plugin_option;
427
while((plugin_option = strsep(&arg, ",")) != NULL){
428
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
430
}
431
}
432
}
433
break;
434
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
436
break;
437
case 'o': /* --options-for */
438
{
439
char *option_list = strchr(arg, ':');
440
if(option_list == NULL){
441
argp_error(state, "No colon in \"%s\"", arg);
442
errno = EINVAL;
443
break;
444
}
445
*option_list = '\0';
446
option_list++;
447
if(arg[0] == '\0'){
448
argp_error(state, "Empty plugin name");
449
errno = EINVAL;
450
break;
451
}
452
char *option;
453
while((option = strsep(&option_list, ",")) != NULL){
454
if(not add_argument(getplugin(arg), option)){
455
break;
456
}
457
}
458
}
459
break;
460
case 'E': /* --env-for */
461
{
462
char *envdef = strchr(arg, ':');
463
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
466
break;
467
}
468
*envdef = '\0';
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
474
}
475
add_environment(getplugin(arg), envdef, true);
476
}
477
break;
478
case 'd': /* --disable */
479
{
480
plugin *p = getplugin(arg);
481
if(p != NULL){
482
p->disabled = true;
483
}
484
}
485
break;
486
case 'e': /* --enable */
487
{
488
plugin *p = getplugin(arg);
489
if(p != NULL){
490
p->disabled = false;
491
}
492
}
493
break;
494
case 128: /* --plugin-dir */
495
free(plugindir);
496
plugindir = strdup(arg);
497
break;
498
case 129: /* --config-file */
499
/* This is already done by parse_opt_config_file() */
500
break;
501
case 130: /* --userid */
502
tmpmax = strtoimax(arg, &tmp, 10);
503
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
508
}
509
uid = (uid_t)tmpmax;
510
break;
511
case 131: /* --groupid */
512
tmpmax = strtoimax(arg, &tmp, 10);
513
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
518
}
519
gid = (gid_t)tmpmax;
520
break;
521
case 132: /* --debug */
237
522
debug = true;
238
523
break;
239
case ARGP_KEY_ARG:
240
argp_usage (state);
241
break;
242
case ARGP_KEY_END:
243
break;
244
default:
245
return ARGP_ERR_UNKNOWN;
246
}
247
return 0;
248
}
249
250
plugin *plugin_list = NULL;
251
252
struct argp argp = { .options = options, .parser = parse_opt,
524
/*
525
* These reproduce what we would get without ARGP_NO_HELP
526
*/
527
case '?': /* --help */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
530
case -3: /* --usage */
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
argp_state_help(state, state->out_stream,
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
534
case 'V': /* --version */
535
fprintf(state->out_stream, "%s\n", argp_program_version);
536
exit(EXIT_SUCCESS);
537
break;
538
/*
539
* When adding more options before this line, remember to also add a
540
* "case" to the "parse_opt_config_file" function below.
541
*/
542
case ARGP_KEY_ARG:
543
/* Cryptsetup always passes an argument, which is an empty
544
string if "none" was specified in /etc/crypttab. So if
545
argument was empty, we ignore it silently. */
546
if(arg[0] == '\0'){
547
break;
548
}
549
default:
550
return ARGP_ERR_UNKNOWN;
551
}
552
return errno; /* Set to 0 at start */
553
}
554
555
/* This option parser is the same as parse_opt() above, except it
556
ignores everything but the --config-file option. */
557
error_t parse_opt_config_file(int key, char *arg,
558
__attribute__((unused))
559
struct argp_state *state){
560
errno = 0;
561
switch(key){
562
case 'g': /* --global-options */
563
case 'G': /* --global-env */
564
case 'o': /* --options-for */
565
case 'E': /* --env-for */
566
case 'd': /* --disable */
567
case 'e': /* --enable */
568
case 128: /* --plugin-dir */
569
break;
570
case 129: /* --config-file */
571
free(argfile);
572
argfile = strdup(arg);
573
break;
574
case 130: /* --userid */
575
case 131: /* --groupid */
576
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
580
case ARGP_KEY_ARG:
581
break;
582
default:
583
return ARGP_ERR_UNKNOWN;
584
}
585
return errno;
586
}
587
588
struct argp argp = { .options = options,
589
.parser = parse_opt_config_file,
253
590
.args_doc = "",
254
591
.doc = "Mandos plugin runner -- Run plugins" };
255
592
256
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
593
/* Parse using parse_opt_config_file() in order to get the custom
594
config file location, if any. */
595
ret = argp_parse(&argp, argc, argv,
596
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
597
NULL, NULL);
598
switch(ret){
599
case 0:
600
break;
601
case ENOMEM:
602
default:
603
errno = ret;
604
error(0, errno, "argp_parse");
605
exitstatus = EX_OSERR;
606
goto fallback;
607
case EINVAL:
608
exitstatus = EX_USAGE;
609
goto fallback;
610
}
611
612
/* Reset to the normal argument parser */
613
argp.parser = parse_opt;
614
615
/* Open the configfile if available */
616
if(argfile == NULL){
617
conffp = fopen(AFILE, "r");
618
} else {
619
conffp = fopen(argfile, "r");
620
}
621
if(conffp != NULL){
622
char *org_line = NULL;
623
char *p, *arg, *new_arg, *line;
624
size_t size = 0;
625
const char whitespace_delims[] = " \r\t\f\v\n";
626
const char comment_delim[] = "#";
627
628
custom_argc = 1;
629
custom_argv = malloc(sizeof(char*) * 2);
630
if(custom_argv == NULL){
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
633
goto fallback;
634
}
635
custom_argv[0] = argv[0];
636
custom_argv[1] = NULL;
637
638
/* for each line in the config file, strip whitespace and ignore
639
commented text */
640
while(true){
641
sret = getline(&org_line, &size, conffp);
642
if(sret == -1){
643
break;
644
}
645
646
line = org_line;
647
arg = strsep(&line, comment_delim);
648
while((p = strsep(&arg, whitespace_delims)) != NULL){
649
if(p[0] == '\0'){
650
continue;
651
}
652
new_arg = strdup(p);
653
if(new_arg == NULL){
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
656
free(org_line);
657
goto fallback;
658
}
659
660
custom_argc += 1;
661
custom_argv = realloc(custom_argv, sizeof(char *)
662
* ((unsigned int) custom_argc + 1));
663
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
666
free(org_line);
667
goto fallback;
668
}
669
custom_argv[custom_argc-1] = new_arg;
670
custom_argv[custom_argc] = NULL;
671
}
672
}
673
do {
674
ret = fclose(conffp);
675
} while(ret == EOF and errno == EINTR);
676
if(ret == EOF){
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
679
goto fallback;
680
}
681
free(org_line);
682
} else {
683
/* Check for harmful errors and go to fallback. Other errors might
684
not affect opening plugins */
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
688
goto fallback;
689
}
690
}
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
693
if(custom_argv != NULL){
694
ret = argp_parse(&argp, custom_argc, custom_argv,
695
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
696
NULL, NULL);
697
switch(ret){
698
case 0:
699
break;
700
case ENOMEM:
701
default:
702
errno = ret;
703
error(0, errno, "argp_parse");
704
exitstatus = EX_OSERR;
705
goto fallback;
706
case EINVAL:
707
exitstatus = EX_CONFIG;
708
goto fallback;
709
}
710
}
711
712
/* Parse actual command line arguments, to let them override the
713
config file */
714
ret = argp_parse(&argp, argc, argv,
715
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
716
NULL, NULL);
717
switch(ret){
718
case 0:
719
break;
720
case ENOMEM:
721
default:
722
errno = ret;
723
error(0, errno, "argp_parse");
724
exitstatus = EX_OSERR;
725
goto fallback;
726
case EINVAL:
727
exitstatus = EX_USAGE;
728
goto fallback;
729
}
257
730
258
731
if(debug){
259
732
for(plugin *p = plugin_list; p != NULL; p=p->next){
262
735
for(char **a = p->argv; *a != NULL; a++){
263
736
fprintf(stderr, "\tArg: %s\n", *a);
264
737
}
265
}
266
}
267
268
dir = opendir(plugindir);
269
if(dir == NULL){
270
perror("Could not open plugin dir");
271
exitstatus = EXIT_FAILURE;
272
goto end;
273
}
274
275
/* Set the FD_CLOEXEC flag on the directory, if possible */
276
{
277
int dir_fd = dirfd(dir);
278
if(dir_fd >= 0){
279
ret = set_cloexec_flag(dir_fd);
280
if(ret < 0){
281
perror("set_cloexec_flag");
282
exitstatus = EXIT_FAILURE;
283
goto end;
284
}
738
fprintf(stderr, "...and %d environment variables\n", p->envc);
739
for(char **a = p->environ; *a != NULL; a++){
740
fprintf(stderr, "\t%s\n", *a);
741
}
742
}
743
}
744
745
{
746
/* Work around Debian bug #633582:
747
<http://bugs.debian.org/633582> */
748
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
749
if(plugindir_fd == -1){
750
error(0, errno, "open");
751
} else {
752
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
753
if(ret == -1){
754
error(0, errno, "fstat");
755
} else {
756
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
757
ret = fchown(plugindir_fd, uid, gid);
758
if(ret == -1){
759
error(0, errno, "fchown");
760
}
761
}
762
}
763
TEMP_FAILURE_RETRY(close(plugindir_fd));
764
}
765
}
766
767
/* Lower permissions */
768
setgid(gid);
769
if(ret == -1){
770
error(0, errno, "setgid");
771
}
772
ret = setuid(uid);
773
if(ret == -1){
774
error(0, errno, "setuid");
775
}
776
777
/* Open plugin directory with close_on_exec flag */
778
{
779
int dir_fd = -1;
780
if(plugindir == NULL){
781
dir_fd = open(PDIR, O_RDONLY |
782
#ifdef O_CLOEXEC
783
O_CLOEXEC
784
#else /* not O_CLOEXEC */
785
0
786
#endif /* not O_CLOEXEC */
787
);
788
} else {
789
dir_fd = open(plugindir, O_RDONLY |
790
#ifdef O_CLOEXEC
791
O_CLOEXEC
792
#else /* not O_CLOEXEC */
793
0
794
#endif /* not O_CLOEXEC */
795
);
796
}
797
if(dir_fd == -1){
798
error(0, errno, "Could not open plugin dir");
799
exitstatus = EX_UNAVAILABLE;
800
goto fallback;
801
}
802
803
#ifndef O_CLOEXEC
804
/* Set the FD_CLOEXEC flag on the directory */
805
ret = set_cloexec_flag(dir_fd);
806
if(ret < 0){
807
error(0, errno, "set_cloexec_flag");
808
TEMP_FAILURE_RETRY(close(dir_fd));
809
exitstatus = EX_OSERR;
810
goto fallback;
811
}
812
#endif /* O_CLOEXEC */
813
814
dir = fdopendir(dir_fd);
815
if(dir == NULL){
816
error(0, errno, "Could not open plugin dir");
817
TEMP_FAILURE_RETRY(close(dir_fd));
818
exitstatus = EX_OSERR;
819
goto fallback;
285
820
}
286
821
}
287
822
288
823
FD_ZERO(&rfds_all);
289
824
825
/* Read and execute any executable in the plugin directory*/
290
826
while(true){
291
dirst = readdir(dir);
827
do {
828
dirst = readdir(dir);
829
} while(dirst == NULL and errno == EINTR);
292
830
293
// All directory entries have been processed
831
/* All directory entries have been processed */
294
832
if(dirst == NULL){
833
if(errno == EBADF){
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
836
goto fallback;
837
}
295
838
break;
296
839
}
297
840
298
841
d_name_len = strlen(dirst->d_name);
299
842
300
// Ignore dotfiles, backup files and other junk
843
/* Ignore dotfiles, backup files and other junk */
301
844
{
302
845
bool bad_name = false;
303
846
305
848
306
849
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
307
850
".dpkg-old",
851
".dpkg-bak",
308
852
".dpkg-divert", NULL };
309
853
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
310
854
size_t pre_len = strlen(*pre);
318
862
break;
319
863
}
320
864
}
321
322
865
if(bad_name){
323
866
continue;
324
867
}
325
326
868
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
327
869
size_t suf_len = strlen(*suf);
328
870
if((d_name_len >= suf_len)
329
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
330
872
== 0)){
331
873
if(debug){
332
874
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
342
884
}
343
885
}
344
886
345
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
346
if (filename == NULL){
347
perror("malloc");
348
exitstatus = EXIT_FAILURE;
349
goto end;
350
}
351
strcpy(filename, plugindir); /* Spurious warning */
352
strcat(filename, "/"); /* Spurious warning */
353
strcat(filename, dirst->d_name); /* Spurious warning */
354
355
stat(filename, &st);
356
357
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
char *filename;
888
if(plugindir == NULL){
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
890
dirst->d_name));
891
} else {
892
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
893
plugindir,
894
dirst->d_name));
895
}
896
if(ret < 0){
897
error(0, errno, "asprintf");
898
continue;
899
}
900
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
902
if(ret == -1){
903
error(0, errno, "stat");
904
free(filename);
905
continue;
906
}
907
908
/* Ignore non-executable files */
909
if(not S_ISREG(st.st_mode)
910
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
358
911
if(debug){
359
912
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
360
913
" with bad type or mode\n", filename);
362
915
free(filename);
363
916
continue;
364
917
}
365
if(getplugin(dirst->d_name, &plugin_list)->disabled){
918
919
plugin *p = getplugin(dirst->d_name);
920
if(p == NULL){
921
error(0, errno, "getplugin");
922
free(filename);
923
continue;
924
}
925
if(p->disabled){
366
926
if(debug){
367
927
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
368
928
dirst->d_name);
370
930
free(filename);
371
931
continue;
372
932
}
373
plugin *p = getplugin(dirst->d_name, &plugin_list);
374
933
{
375
934
/* Add global arguments to argument list for this plugin */
376
plugin *g = getplugin(NULL, &plugin_list);
377
for(char **a = g->argv + 1; *a != NULL; a++){
378
addargument(p, *a);
379
}
380
}
381
int pipefd[2];
382
ret = pipe(pipefd);
383
if (ret == -1){
384
perror("pipe");
385
exitstatus = EXIT_FAILURE;
386
goto end;
387
}
935
plugin *g = getplugin(NULL);
936
if(g != NULL){
937
for(char **a = g->argv + 1; *a != NULL; a++){
938
if(not add_argument(p, *a)){
939
error(0, errno, "add_argument");
940
}
941
}
942
/* Add global environment variables */
943
for(char **e = g->environ; *e != NULL; e++){
944
if(not add_environment(p, *e, false)){
945
error(0, errno, "add_environment");
946
}
947
}
948
}
949
}
950
/* If this plugin has any environment variables, we will call
951
using execve and need to duplicate the environment from this
952
process, too. */
953
if(p->environ[0] != NULL){
954
for(char **e = environ; *e != NULL; e++){
955
if(not add_environment(p, *e, false)){
956
error(0, errno, "add_environment");
957
}
958
}
959
}
960
961
int pipefd[2];
962
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
963
if(ret == -1){
964
error(0, errno, "pipe");
965
exitstatus = EX_OSERR;
966
goto fallback;
967
}
968
/* Ask OS to automatic close the pipe on exec */
388
969
ret = set_cloexec_flag(pipefd[0]);
389
970
if(ret < 0){
390
perror("set_cloexec_flag");
391
exitstatus = EXIT_FAILURE;
392
goto end;
971
error(0, errno, "set_cloexec_flag");
972
exitstatus = EX_OSERR;
973
goto fallback;
393
974
}
394
975
ret = set_cloexec_flag(pipefd[1]);
395
976
if(ret < 0){
396
perror("set_cloexec_flag");
397
exitstatus = EXIT_FAILURE;
398
goto end;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
979
goto fallback;
399
980
}
400
981
/* Block SIGCHLD until process is safely in process list */
401
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
982
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
983
&sigchld_action.sa_mask,
984
NULL));
402
985
if(ret < 0){
403
perror("sigprocmask");
404
exitstatus = EXIT_FAILURE;
405
goto end;
406
}
407
// Starting a new process to be watched
408
pid_t pid = fork();
986
error(0, errno, "sigprocmask");
987
exitstatus = EX_OSERR;
988
goto fallback;
989
}
990
/* Starting a new process to be watched */
991
pid_t pid;
992
do {
993
pid = fork();
994
} while(pid == -1 and errno == EINTR);
995
if(pid == -1){
996
error(0, errno, "fork");
997
exitstatus = EX_OSERR;
998
goto fallback;
999
}
409
1000
if(pid == 0){
410
1001
/* this is the child process */
411
1002
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
412
1003
if(ret < 0){
413
perror("sigaction");
414
_exit(EXIT_FAILURE);
1004
error(0, errno, "sigaction");
1005
_exit(EX_OSERR);
415
1006
}
416
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1007
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
417
1008
if(ret < 0){
418
perror("sigprocmask");
419
_exit(EXIT_FAILURE);
420
}
421
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1009
error(0, errno, "sigprocmask");
1010
_exit(EX_OSERR);
1011
}
1012
1013
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1014
if(ret == -1){
1015
error(0, errno, "dup2");
1016
_exit(EX_OSERR);
1017
}
422
1018
423
1019
if(dirfd(dir) < 0){
424
1020
/* If dir has no file descriptor, we could not set FD_CLOEXEC
425
1021
above and must now close it manually here. */
426
1022
closedir(dir);
427
1023
}
428
if(execv(filename, p->argv) < 0){
429
perror("execv");
430
_exit(EXIT_FAILURE);
1024
if(p->environ[0] == NULL){
1025
if(execv(filename, p->argv) < 0){
1026
error(0, errno, "execv for %s", filename);
1027
_exit(EX_OSERR);
1028
}
1029
} else {
1030
if(execve(filename, p->argv, p->environ) < 0){
1031
error(0, errno, "execve for %s", filename);
1032
_exit(EX_OSERR);
1033
}
431
1034
}
432
1035
/* no return */
433
1036
}
434
/* parent process */
1037
/* Parent process */
1038
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1039
pipe */
435
1040
free(filename);
436
close(pipefd[1]); /* close unused write end of pipe */
437
process *new_process = malloc(sizeof(process));
438
if (new_process == NULL){
439
perror("malloc");
440
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1041
plugin *new_plugin = getplugin(dirst->d_name);
1042
if(new_plugin == NULL){
1043
error(0, errno, "getplugin");
1044
ret = (int)(TEMP_FAILURE_RETRY
1045
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1046
NULL)));
441
1047
if(ret < 0){
442
perror("sigprocmask");
1048
error(0, errno, "sigprocmask");
443
1049
}
444
exitstatus = EXIT_FAILURE;
445
goto end;
1050
exitstatus = EX_OSERR;
1051
goto fallback;
446
1052
}
447
1053
448
*new_process = (struct process){ .pid = pid,
449
.fd = pipefd[0],
450
.next = process_list };
451
// List handling
452
process_list = new_process;
1054
new_plugin->pid = pid;
1055
new_plugin->fd = pipefd[0];
1056
453
1057
/* Unblock SIGCHLD so signal handler can be run if this process
454
1058
has already completed */
455
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1059
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1060
&sigchld_action.sa_mask,
1061
NULL));
456
1062
if(ret < 0){
457
perror("sigprocmask");
458
exitstatus = EXIT_FAILURE;
459
goto end;
460
}
461
462
FD_SET(new_process->fd, &rfds_all);
463
464
if (maxfd < new_process->fd){
465
maxfd = new_process->fd;
466
}
467
468
}
469
470
/* Free the plugin list */
471
for(plugin *next; plugin_list != NULL; plugin_list = next){
472
next = plugin_list->next;
473
free(plugin_list->argv);
474
free(plugin_list);
475
}
476
477
closedir(dir);
1063
error(0, errno, "sigprocmask");
1064
exitstatus = EX_OSERR;
1065
goto fallback;
1066
}
1067
1068
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1069
-Wconversion */
1070
1071
if(maxfd < new_plugin->fd){
1072
maxfd = new_plugin->fd;
1073
}
1074
}
1075
1076
TEMP_FAILURE_RETRY(closedir(dir));
478
1077
dir = NULL;
1078
free_plugin(getplugin(NULL));
479
1079
480
if (process_list == NULL){
481
fprintf(stderr, "No plugin processes started, exiting\n");
482
exitstatus = EXIT_FAILURE;
483
goto end;
1080
for(plugin *p = plugin_list; p != NULL; p = p->next){
1081
if(p->pid != 0){
1082
break;
1083
}
1084
if(p->next == NULL){
1085
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1086
" directory?\n");
1087
free_plugin_list();
1088
}
484
1089
}
485
while(process_list){
1090
1091
/* Main loop while running plugins exist */
1092
while(plugin_list){
486
1093
fd_set rfds = rfds_all;
487
1094
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
488
if (select_ret == -1){
489
perror("select");
490
exitstatus = EXIT_FAILURE;
491
goto end;
1095
if(select_ret == -1 and errno != EINTR){
1096
error(0, errno, "select");
1097
exitstatus = EX_OSERR;
1098
goto fallback;
492
1099
}
493
1100
/* OK, now either a process completed, or something can be read
494
1101
from one of them */
495
for(process *proc = process_list; proc ; proc = proc->next){
1102
for(plugin *proc = plugin_list; proc != NULL;){
496
1103
/* Is this process completely done? */
497
if(proc->eof and proc->completed){
1104
if(proc->completed and proc->eof){
498
1105
/* Only accept the plugin output if it exited cleanly */
499
1106
if(not WIFEXITED(proc->status)
500
1107
or WEXITSTATUS(proc->status) != 0){
501
1108
/* Bad exit by plugin */
1109
502
1110
if(debug){
503
1111
if(WIFEXITED(proc->status)){
504
fprintf(stderr, "Plugin %d exited with status %d\n",
505
proc->pid, WEXITSTATUS(proc->status));
506
} else if(WIFSIGNALED(proc->status)) {
507
fprintf(stderr, "Plugin %d killed by signal %d\n",
508
proc->pid, WTERMSIG(proc->status));
1112
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1113
" status %d\n", proc->name,
1114
(intmax_t) (proc->pid),
1115
WEXITSTATUS(proc->status));
1116
} else if(WIFSIGNALED(proc->status)){
1117
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1118
" signal %d: %s\n", proc->name,
1119
(intmax_t) (proc->pid),
1120
WTERMSIG(proc->status),
1121
strsignal(WTERMSIG(proc->status)));
509
1122
} else if(WCOREDUMP(proc->status)){
510
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1124
" core\n", proc->name, (intmax_t) (proc->pid));
511
1125
}
512
1126
}
1127
513
1128
/* Remove the plugin */
514
FD_CLR(proc->fd, &rfds_all);
1129
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1130
-Wconversion */
1131
515
1132
/* Block signal while modifying process_list */
516
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1134
(SIG_BLOCK,
1135
&sigchld_action.sa_mask,
1136
NULL));
517
1137
if(ret < 0){
518
perror("sigprocmask");
519
exitstatus = EXIT_FAILURE;
520
goto end;
521
}
522
/* Delete this process entry from the list */
523
if(process_list == proc){
524
/* First one - simple */
525
process_list = proc->next;
526
} else {
527
/* Second one or later */
528
for(process *p = process_list; p != NULL; p = p->next){
529
if(p->next == proc){
530
p->next = proc->next;
531
break;
532
}
533
}
534
}
1138
error(0, errno, "sigprocmask");
1139
exitstatus = EX_OSERR;
1140
goto fallback;
1141
}
1142
1143
plugin *next_plugin = proc->next;
1144
free_plugin(proc);
1145
proc = next_plugin;
1146
535
1147
/* We are done modifying process list, so unblock signal */
536
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
537
NULL);
1148
ret = (int)(TEMP_FAILURE_RETRY
1149
(sigprocmask(SIG_UNBLOCK,
1150
&sigchld_action.sa_mask, NULL)));
538
1151
if(ret < 0){
539
perror("sigprocmask");
540
}
541
free(proc->buffer);
542
free(proc);
543
/* We deleted this process from the list, so we can't go
544
proc->next. Therefore, start over from the beginning of
545
the process list */
546
break;
1152
error(0, errno, "sigprocmask");
1153
exitstatus = EX_OSERR;
1154
goto fallback;
1155
}
1156
1157
if(plugin_list == NULL){
1158
break;
1159
}
1160
1161
continue;
547
1162
}
1163
548
1164
/* This process exited nicely, so print its buffer */
549
for(size_t written = 0; written < proc->buffer_length;
550
written += (size_t)ret){
551
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
552
proc->buffer + written,
553
proc->buffer_length
554
- written));
555
if(ret < 0){
556
perror("write");
557
exitstatus = EXIT_FAILURE;
558
goto end;
559
}
1165
1166
bool bret = print_out_password(proc->buffer,
1167
proc->buffer_length);
1168
if(not bret){
1169
error(0, errno, "print_out_password");
1170
exitstatus = EX_IOERR;
560
1171
}
561
goto end;
1172
goto fallback;
562
1173
}
1174
563
1175
/* This process has not completed. Does it have any output? */
564
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1176
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1177
warning from
1178
-Wconversion */
565
1179
/* This process had nothing to say at this time */
1180
proc = proc->next;
566
1181
continue;
567
1182
}
568
1183
/* Before reading, make the process' data buffer large enough */
569
1184
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
570
1185
proc->buffer = realloc(proc->buffer, proc->buffer_size
571
1186
+ (size_t) BUFFER_SIZE);
572
if (proc->buffer == NULL){
573
perror("malloc");
574
exitstatus = EXIT_FAILURE;
575
goto end;
1187
if(proc->buffer == NULL){
1188
error(0, errno, "malloc");
1189
exitstatus = EX_OSERR;
1190
goto fallback;
576
1191
}
577
1192
proc->buffer_size += BUFFER_SIZE;
578
1193
}
579
1194
/* Read from the process */
580
ret = read(proc->fd, proc->buffer + proc->buffer_length,
581
BUFFER_SIZE);
582
if(ret < 0){
1195
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1196
proc->buffer
1197
+ proc->buffer_length,
1198
BUFFER_SIZE));
1199
if(sret < 0){
583
1200
/* Read error from this process; ignore the error */
1201
proc = proc->next;
584
1202
continue;
585
1203
}
586
if(ret == 0){
1204
if(sret == 0){
587
1205
/* got EOF */
588
1206
proc->eof = true;
589
1207
} else {
590
proc->buffer_length += (size_t) ret;
1208
proc->buffer_length += (size_t) sret;
591
1209
}
592
1210
}
593
1211
}
594
if(process_list == NULL){
595
fprintf(stderr, "All plugin processes failed, exiting\n");
596
exitstatus = EXIT_FAILURE;
1212
1213
1214
fallback:
1215
1216
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1217
and exitstatus != EX_OK)){
1218
/* Fallback if all plugins failed, none are found or an error
1219
occured */
1220
bool bret;
1221
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1222
char *passwordbuffer = getpass("Password: ");
1223
size_t len = strlen(passwordbuffer);
1224
/* Strip trailing newline */
1225
if(len > 0 and passwordbuffer[len-1] == '\n'){
1226
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1227
len--;
1228
}
1229
bret = print_out_password(passwordbuffer, len);
1230
if(not bret){
1231
error(0, errno, "print_out_password");
1232
exitstatus = EX_IOERR;
1233
}
597
1234
}
598
1235
599
end:
600
1236
/* Restore old signal handler */
601
sigaction(SIGCHLD, &old_sigchld_action, NULL);
1237
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1238
if(ret == -1){
1239
error(0, errno, "sigaction");
1240
exitstatus = EX_OSERR;
1241
}
602
1242
603
/* Free the plugin list */
604
for(plugin *next; plugin_list != NULL; plugin_list = next){
605
next = plugin_list->next;
606
free(plugin_list->argv);
607
free(plugin_list);
1243
if(custom_argv != NULL){
1244
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1245
free(*arg);
1246
}
1247
free(custom_argv);
608
1248
}
609
1249
610
1250
if(dir != NULL){
611
1251
closedir(dir);
612
1252
}
613
1253
614
/* Free the process list and kill the processes */
615
for(process *next; process_list != NULL; process_list = next){
616
next = process_list->next;
617
close(process_list->fd);
618
kill(process_list->pid, SIGTERM);
619
free(process_list->buffer);
620
free(process_list);
1254
/* Kill the processes */
1255
for(plugin *p = plugin_list; p != NULL; p = p->next){
1256
if(p->pid != 0){
1257
close(p->fd);
1258
ret = kill(p->pid, SIGTERM);
1259
if(ret == -1 and errno != ESRCH){
1260
/* Set-uid proccesses might not get closed */
1261
error(0, errno, "kill");
1262
}
1263
}
621
1264
}
622
1265
623
1266
/* Wait for any remaining child processes to terminate */
624
do{
1267
do {
625
1268
ret = wait(NULL);
626
1269
} while(ret >= 0);
627
1270
if(errno != ECHILD){
628
perror("wait");
1271
error(0, errno, "wait");
629
1272
}
630
1273
1274
free_plugin_list();
1275
1276
free(plugindir);
1277
free(argfile);
1278
631
1279
return exitstatus;
632
1280
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0