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- Committer: Björn Påhlsson
- Date: 2008-08-24 23:13:57 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 102.
- Revision ID: belorn@braxen-20080824231357-e304pw7ls2dnnvw5
* plugin-runner.c (handle_sigchld): Loop until all exited children
have been wait()ed for.
have been wait()ed for.
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2012 Teddy Hogeborn
6
* Copyright © 2008-2012 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
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
25
asprintf() */
27
26
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
36
35
uid_t, gid_t, getuid(), getgid(),
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
40
WEXITSTATUS() */
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
44
readdir(), closedir(), dirfd() */
47
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
53
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
53
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
61
58
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
64
60
#include <signal.h> /* struct sigaction, sigemptyset(),
65
61
sigaddset(), sigaction(),
66
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
63
SIG_UNBLOCK, kill() */
69
64
#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
65
76
66
#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>";
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
83
85
84
86
typedef struct plugin{
85
87
char *name; /* can be NULL or any plugin name */
88
90
char **environ;
89
91
int envc;
90
92
bool disabled;
91
92
/* Variables used for running processes*/
93
pid_t pid;
94
int fd;
95
char *buffer;
96
size_t buffer_size;
97
size_t buffer_length;
98
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
101
93
struct plugin *next;
102
94
} plugin;
103
95
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))){
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
if ((p->name == name)
99
or (p->name and name and (strcmp(p->name, name) == 0))){
113
100
return p;
114
101
}
115
102
}
116
103
/* 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){
104
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
122
106
return NULL;
123
107
}
124
108
char *copy_name = NULL;
125
109
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
110
copy_name = strdup(name);
129
111
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
133
112
return NULL;
134
113
}
135
114
}
136
115
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
116
*new_plugin = (plugin) { .name = copy_name,
117
.argc = 1,
118
.envc = 0,
119
.disabled = false,
120
.next = *plugin_list };
141
121
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;
122
new_plugin->argv = malloc(sizeof(char *) * 2);
123
if (new_plugin->argv == NULL){
147
124
free(copy_name);
148
125
free(new_plugin);
149
errno = e;
150
126
return NULL;
151
127
}
152
128
new_plugin->argv[0] = copy_name;
153
129
new_plugin->argv[1] = NULL;
154
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
130
131
new_plugin->environ = malloc(sizeof(char *));
158
132
if(new_plugin->environ == NULL){
159
int e = errno;
160
133
free(copy_name);
161
134
free(new_plugin->argv);
162
135
free(new_plugin);
163
errno = e;
164
136
return NULL;
165
137
}
166
138
new_plugin->environ[0] = NULL;
167
168
139
/* Append the new plugin to the list */
169
plugin_list = new_plugin;
140
*plugin_list = new_plugin;
170
141
return new_plugin;
171
142
}
172
143
173
144
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
175
145
static bool add_to_char_array(const char *new, char ***array,
176
146
int *len){
177
147
/* Resize the pointed-to array to hold one more pointer */
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
148
*array = realloc(*array, sizeof(char *)
149
* (size_t) ((*len) + 2));
182
150
/* Malloc check */
183
151
if(*array == NULL){
184
152
return false;
185
153
}
186
154
/* Make a copy of the new string */
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
155
char *copy = strdup(new);
191
156
if(copy == NULL){
192
157
return false;
193
158
}
200
165
}
201
166
202
167
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
204
168
static bool add_argument(plugin *p, const char *arg){
205
169
if(p == NULL){
206
170
return false;
209
173
}
210
174
211
175
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
213
static bool add_environment(plugin *p, const char *def, bool replace){
176
static bool add_environment(plugin *p, const char *def){
214
177
if(p == NULL){
215
178
return false;
216
179
}
217
/* namelen = length of name of environment variable */
218
size_t namelen = (size_t)(strchrnul(def, '=') - def);
219
/* Search for this environment variable */
220
for(char **e = p->environ; *e != NULL; e++){
221
if(strncmp(*e, def, namelen + 1) == 0){
222
/* It already exists */
223
if(replace){
224
char *new;
225
do {
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
228
if(new == NULL){
229
return false;
230
}
231
*e = new;
232
strcpy(*e, def);
233
}
234
return true;
235
}
236
}
237
180
return add_to_char_array(def, &(p->environ), &(p->envc));
238
181
}
239
182
183
240
184
/*
241
185
* Based on the example in the GNU LibC manual chapter 13.13 "File
242
186
* Descriptor Flags".
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
187
* *Note File Descriptor Flags:(libc)Descriptor Flags.
244
188
*/
245
static int set_cloexec_flag(int fd){
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
189
static int set_cloexec_flag(int fd)
190
{
191
int ret = fcntl(fd, F_GETFD, 0);
247
192
/* If reading the flags failed, return error indication now. */
248
193
if(ret < 0){
249
194
return ret;
250
195
}
251
196
/* Store modified flag word in the descriptor. */
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
197
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
254
198
}
255
199
200
process *process_list = NULL;
256
201
257
/* Mark processes as completed when they exit, and save their exit
202
/* Mark processes as completed when it exits, and save its exit
258
203
status. */
259
static void handle_sigchld(__attribute__((unused)) int sig){
260
int old_errno = errno;
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
261
206
while(true){
262
plugin *proc = plugin_list;
263
207
int status;
264
208
pid_t pid = waitpid(-1, &status, WNOHANG);
265
209
if(pid == 0){
266
/* Only still running child processes */
267
210
break;
268
211
}
269
212
if(pid == -1){
270
if(errno == ECHILD){
271
/* No child processes */
272
break;
213
if (errno != ECHILD){
214
perror("waitpid");
273
215
}
274
error(0, errno, "waitpid");
216
return;
275
217
}
276
277
/* A child exited, find it in process_list */
218
278
219
while(proc != NULL and proc->pid != pid){
279
220
proc = proc->next;
280
221
}
283
224
continue;
284
225
}
285
226
proc->status = status;
286
proc->completed = 1;
227
proc->completed = true;
287
228
}
288
errno = old_errno;
289
229
}
290
230
291
/* Prints out a password to stdout */
292
__attribute__((nonnull))
293
static bool print_out_password(const char *buffer, size_t length){
231
bool print_out_password(const char *buffer, size_t length){
294
232
ssize_t ret;
233
if(length>0 and buffer[length-1] == '\n'){
234
length--;
235
}
295
236
for(size_t written = 0; written < length; written += (size_t)ret){
296
237
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
297
238
length - written));
302
243
return true;
303
244
}
304
245
305
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
307
static void free_plugin(plugin *plugin_node){
308
309
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
310
free(*arg);
311
}
312
free(plugin_node->argv);
313
for(char **env = plugin_node->environ; *env != NULL; env++){
314
free(*env);
315
}
316
free(plugin_node->environ);
317
free(plugin_node->buffer);
318
319
/* Removes the plugin from the singly-linked list */
320
if(plugin_node == plugin_list){
321
/* First one - simple */
322
plugin_list = plugin_list->next;
323
} else {
324
/* Second one or later */
325
for(plugin *p = plugin_list; p != NULL; p = p->next){
326
if(p->next == plugin_node){
327
p->next = plugin_node->next;
328
break;
329
}
246
char **add_to_argv(char **argv, int *argc, char *arg){
247
if (argv == NULL){
248
*argc = 1;
249
argv = malloc(sizeof(char*) * 2);
250
if(argv == NULL){
251
return NULL;
330
252
}
331
}
332
333
free(plugin_node);
253
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
254
argv[1] = NULL;
255
}
256
*argc += 1;
257
argv = realloc(argv, sizeof(char *)
258
* ((unsigned int) *argc + 1));
259
if(argv == NULL){
260
return NULL;
261
}
262
argv[*argc-1] = arg;
263
argv[*argc] = NULL;
264
return argv;
334
265
}
335
266
336
static void free_plugin_list(void){
337
while(plugin_list != NULL){
338
free_plugin(plugin_list);
267
static void free_plugin_list(plugin *plugin_list){
268
for(plugin *next; plugin_list != NULL; plugin_list = next){
269
next = plugin_list->next;
270
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
271
free(*arg);
272
}
273
free(plugin_list->argv);
274
for(char **env = plugin_list->environ; *env != NULL; env++){
275
free(*env);
276
}
277
free(plugin_list->environ);
278
free(plugin_list);
339
279
}
340
280
}
341
281
342
282
int main(int argc, char *argv[]){
343
char *plugindir = NULL;
344
char *argfile = NULL;
283
const char *plugindir = "/lib/mandos/plugins.d";
284
const char *argfile = ARGFILE;
345
285
FILE *conffp;
346
286
size_t d_name_len;
347
287
DIR *dir = NULL;
349
289
struct stat st;
350
290
fd_set rfds_all;
351
291
int ret, maxfd = 0;
352
ssize_t sret;
353
292
uid_t uid = 65534;
354
293
gid_t gid = 65534;
355
294
bool debug = false;
364
303
sigemptyset(&sigchld_action.sa_mask);
365
304
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
366
305
if(ret == -1){
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
306
perror("sigaddset");
307
exitstatus = EXIT_FAILURE;
369
308
goto fallback;
370
309
}
371
310
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
372
311
if(ret == -1){
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
312
perror("sigaction");
313
exitstatus = EXIT_FAILURE;
375
314
goto fallback;
376
315
}
377
316
380
319
{ .name = "global-options", .key = 'g',
381
320
.arg = "OPTION[,OPTION[,...]]",
382
321
.doc = "Options passed to all plugins" },
383
{ .name = "global-env", .key = 'G',
322
{ .name = "global-envs", .key = 'e',
384
323
.arg = "VAR=value",
385
324
.doc = "Environment variable passed to all plugins" },
386
325
{ .name = "options-for", .key = 'o',
387
326
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
388
327
.doc = "Options passed only to specified plugin" },
389
{ .name = "env-for", .key = 'E',
328
{ .name = "envs-for", .key = 'f',
390
329
.arg = "PLUGIN:ENV=value",
391
330
.doc = "Environment variable passed to specified plugin" },
392
331
{ .name = "disable", .key = 'd',
393
332
.arg = "PLUGIN",
394
333
.doc = "Disable a specific plugin", .group = 1 },
395
{ .name = "enable", .key = 'e',
396
.arg = "PLUGIN",
397
.doc = "Enable a specific plugin", .group = 1 },
398
334
{ .name = "plugin-dir", .key = 128,
399
335
.arg = "DIRECTORY",
400
336
.doc = "Specify a different plugin directory", .group = 2 },
401
{ .name = "config-file", .key = 129,
402
.arg = "FILE",
403
.doc = "Specify a different configuration file", .group = 2 },
404
{ .name = "userid", .key = 130,
405
.arg = "ID", .flags = 0,
406
.doc = "User ID the plugins will run as", .group = 3 },
407
{ .name = "groupid", .key = 131,
408
.arg = "ID", .flags = 0,
409
.doc = "Group ID the plugins will run as", .group = 3 },
410
{ .name = "debug", .key = 132,
411
.doc = "Debug mode", .group = 4 },
412
/*
413
* These reproduce what we would get without ARGP_NO_HELP
414
*/
415
{ .name = "help", .key = '?',
416
.doc = "Give this help list", .group = -1 },
417
{ .name = "usage", .key = -3,
418
.doc = "Give a short usage message", .group = -1 },
419
{ .name = "version", .key = 'V',
420
.doc = "Print program version", .group = -1 },
337
{ .name = "userid", .key = 129,
338
.arg = "ID", .flags = 0,
339
.doc = "User ID the plugins will run as", .group = 2 },
340
{ .name = "groupid", .key = 130,
341
.arg = "ID", .flags = 0,
342
.doc = "Group ID the plugins will run as", .group = 2 },
343
{ .name = "debug", .key = 131,
344
.doc = "Debug mode", .group = 3 },
421
345
{ .name = NULL }
422
346
};
423
347
424
__attribute__((nonnull(3)))
425
error_t parse_opt(int key, char *arg, struct argp_state *state){
426
errno = 0;
427
switch(key){
428
char *tmp;
429
intmax_t tmp_id;
430
case 'g': /* --global-options */
431
{
432
char *plugin_option;
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(NULL), plugin_option)){
435
break;
436
}
437
}
438
}
439
break;
440
case 'G': /* --global-env */
441
add_environment(getplugin(NULL), arg, true);
442
break;
443
case 'o': /* --options-for */
444
{
445
char *option_list = strchr(arg, ':');
446
if(option_list == NULL){
447
argp_error(state, "No colon in \"%s\"", arg);
448
errno = EINVAL;
449
break;
450
}
451
*option_list = '\0';
452
option_list++;
453
if(arg[0] == '\0'){
454
argp_error(state, "Empty plugin name");
455
errno = EINVAL;
456
break;
457
}
458
char *option;
459
while((option = strsep(&option_list, ",")) != NULL){
460
if(not add_argument(getplugin(arg), option)){
461
break;
462
}
463
}
464
}
465
break;
466
case 'E': /* --env-for */
348
error_t parse_opt (int key, char *arg, struct argp_state *state) {
349
/* Get the INPUT argument from `argp_parse', which we know is a
350
pointer to our plugin list pointer. */
351
plugin **plugins = state->input;
352
switch (key) {
353
case 'g':
354
if (arg != NULL){
355
char *p;
356
while((p = strsep(&arg, ",")) != NULL){
357
if(p[0] == '\0'){
358
continue;
359
}
360
if(not add_argument(getplugin(NULL, plugins), p)){
361
perror("add_argument");
362
return ARGP_ERR_UNKNOWN;
363
}
364
}
365
}
366
break;
367
case 'e':
368
if(arg == NULL){
369
break;
370
}
371
{
372
char *envdef = strdup(arg);
373
if(envdef == NULL){
374
break;
375
}
376
if(not add_environment(getplugin(NULL, plugins), envdef)){
377
perror("add_environment");
378
}
379
}
380
break;
381
case 'o':
382
if (arg != NULL){
383
char *p_name = strsep(&arg, ":");
384
if(p_name[0] == '\0'){
385
break;
386
}
387
char *opt = strsep(&arg, ":");
388
if(opt[0] == '\0'){
389
break;
390
}
391
if(opt != NULL){
392
char *p;
393
while((p = strsep(&opt, ",")) != NULL){
394
if(p[0] == '\0'){
395
continue;
396
}
397
if(not add_argument(getplugin(p_name, plugins), p)){
398
perror("add_argument");
399
return ARGP_ERR_UNKNOWN;
400
}
401
}
402
}
403
}
404
break;
405
case 'f':
406
if(arg == NULL){
407
break;
408
}
467
409
{
468
410
char *envdef = strchr(arg, ':');
469
411
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
472
break;
473
}
474
*envdef = '\0';
412
break;
413
}
414
char *p_name = strndup(arg, (size_t) (envdef-arg));
415
if(p_name == NULL){
416
break;
417
}
475
418
envdef++;
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
480
}
481
add_environment(getplugin(arg), envdef, true);
482
}
483
break;
484
case 'd': /* --disable */
485
{
486
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = true;
489
}
490
}
491
break;
492
case 'e': /* --enable */
493
{
494
plugin *p = getplugin(arg);
495
if(p != NULL){
496
p->disabled = false;
497
}
498
}
499
break;
500
case 128: /* --plugin-dir */
501
free(plugindir);
502
plugindir = strdup(arg);
503
break;
504
case 129: /* --config-file */
505
/* This is already done by parse_opt_config_file() */
506
break;
507
case 130: /* --userid */
508
tmp_id = strtoimax(arg, &tmp, 10);
509
if(errno != 0 or tmp == arg or *tmp != '\0'
510
or tmp_id != (uid_t)tmp_id){
511
argp_error(state, "Bad user ID number: \"%s\", using %"
512
PRIdMAX, arg, (intmax_t)uid);
513
break;
514
}
515
uid = (uid_t)tmp_id;
516
break;
517
case 131: /* --groupid */
518
tmp_id = strtoimax(arg, &tmp, 10);
519
if(errno != 0 or tmp == arg or *tmp != '\0'
520
or tmp_id != (gid_t)tmp_id){
521
argp_error(state, "Bad group ID number: \"%s\", using %"
522
PRIdMAX, arg, (intmax_t)gid);
523
break;
524
}
525
gid = (gid_t)tmp_id;
526
break;
527
case 132: /* --debug */
419
if(not add_environment(getplugin(p_name, plugins), envdef)){
420
perror("add_environment");
421
}
422
}
423
break;
424
case 'd':
425
if (arg != NULL){
426
plugin *p = getplugin(arg, plugins);
427
if(p == NULL){
428
return ARGP_ERR_UNKNOWN;
429
}
430
p->disabled = true;
431
}
432
break;
433
case 128:
434
plugindir = arg;
435
break;
436
case 129:
437
uid = (uid_t)strtol(arg, NULL, 10);
438
break;
439
case 130:
440
gid = (gid_t)strtol(arg, NULL, 10);
441
break;
442
case 131:
528
443
debug = true;
529
444
break;
530
/*
531
* These reproduce what we would get without ARGP_NO_HELP
532
*/
533
case '?': /* --help */
534
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
535
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
536
case -3: /* --usage */
537
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
538
argp_state_help(state, state->out_stream,
539
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
540
case 'V': /* --version */
541
fprintf(state->out_stream, "%s\n", argp_program_version);
542
exit(EXIT_SUCCESS);
543
break;
544
/*
545
* When adding more options before this line, remember to also add a
546
* "case" to the "parse_opt_config_file" function below.
547
*/
548
case ARGP_KEY_ARG:
549
/* Cryptsetup always passes an argument, which is an empty
550
string if "none" was specified in /etc/crypttab. So if
551
argument was empty, we ignore it silently. */
552
if(arg[0] == '\0'){
553
break;
554
}
555
default:
556
return ARGP_ERR_UNKNOWN;
557
}
558
return errno; /* Set to 0 at start */
559
}
560
561
/* This option parser is the same as parse_opt() above, except it
562
ignores everything but the --config-file option. */
563
error_t parse_opt_config_file(int key, char *arg,
564
__attribute__((unused))
565
struct argp_state *state){
566
errno = 0;
567
switch(key){
568
case 'g': /* --global-options */
569
case 'G': /* --global-env */
570
case 'o': /* --options-for */
571
case 'E': /* --env-for */
572
case 'd': /* --disable */
573
case 'e': /* --enable */
574
case 128: /* --plugin-dir */
575
break;
576
case 129: /* --config-file */
577
free(argfile);
578
argfile = strdup(arg);
579
break;
580
case 130: /* --userid */
581
case 131: /* --groupid */
582
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
586
case ARGP_KEY_ARG:
587
break;
588
default:
589
return ARGP_ERR_UNKNOWN;
590
}
591
return errno;
592
}
593
594
struct argp argp = { .options = options,
595
.parser = parse_opt_config_file,
596
.args_doc = "",
445
case ARGP_KEY_ARG:
446
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
447
break;
448
case ARGP_KEY_END:
449
break;
450
default:
451
return ARGP_ERR_UNKNOWN;
452
}
453
return 0;
454
}
455
456
plugin *plugin_list = NULL;
457
458
struct argp argp = { .options = options, .parser = parse_opt,
459
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
597
460
.doc = "Mandos plugin runner -- Run plugins" };
598
461
599
/* Parse using parse_opt_config_file() in order to get the custom
600
config file location, if any. */
601
ret = argp_parse(&argp, argc, argv,
602
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
603
NULL, NULL);
604
switch(ret){
605
case 0:
606
break;
607
case ENOMEM:
608
default:
609
errno = ret;
610
error(0, errno, "argp_parse");
611
exitstatus = EX_OSERR;
612
goto fallback;
613
case EINVAL:
614
exitstatus = EX_USAGE;
615
goto fallback;
616
}
617
618
/* Reset to the normal argument parser */
619
argp.parser = parse_opt;
620
621
/* Open the configfile if available */
622
if(argfile == NULL){
623
conffp = fopen(AFILE, "r");
624
} else {
625
conffp = fopen(argfile, "r");
626
}
462
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
463
if (ret == ARGP_ERR_UNKNOWN){
464
fprintf(stderr, "Unknown error while parsing arguments\n");
465
exitstatus = EXIT_FAILURE;
466
goto fallback;
467
}
468
469
conffp = fopen(argfile, "r");
627
470
if(conffp != NULL){
628
471
char *org_line = NULL;
629
472
char *p, *arg, *new_arg, *line;
630
473
size_t size = 0;
474
ssize_t sret;
631
475
const char whitespace_delims[] = " \r\t\f\v\n";
632
476
const char comment_delim[] = "#";
633
634
custom_argc = 1;
635
custom_argv = malloc(sizeof(char*) * 2);
636
if(custom_argv == NULL){
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
639
goto fallback;
640
}
641
custom_argv[0] = argv[0];
642
custom_argv[1] = NULL;
643
644
/* for each line in the config file, strip whitespace and ignore
645
commented text */
477
646
478
while(true){
647
479
sret = getline(&org_line, &size, conffp);
648
480
if(sret == -1){
649
481
break;
650
482
}
651
483
652
484
line = org_line;
653
485
arg = strsep(&line, comment_delim);
654
486
while((p = strsep(&arg, whitespace_delims)) != NULL){
656
488
continue;
657
489
}
658
490
new_arg = strdup(p);
659
if(new_arg == NULL){
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
662
free(org_line);
663
goto fallback;
664
}
665
666
custom_argc += 1;
667
custom_argv = realloc(custom_argv, sizeof(char *)
668
* ((unsigned int) custom_argc + 1));
669
if(custom_argv == NULL){
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
672
free(org_line);
673
goto fallback;
674
}
675
custom_argv[custom_argc-1] = new_arg;
676
custom_argv[custom_argc] = NULL;
491
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
492
if (custom_argv == NULL){
493
perror("add_to_argv");
494
exitstatus = EXIT_FAILURE;
495
goto fallback;
496
}
677
497
}
678
498
}
679
do {
680
ret = fclose(conffp);
681
} while(ret == EOF and errno == EINTR);
682
if(ret == EOF){
683
error(0, errno, "fclose");
684
exitstatus = EX_IOERR;
685
goto fallback;
686
}
687
499
free(org_line);
688
} else {
500
} else{
689
501
/* Check for harmful errors and go to fallback. Other errors might
690
502
not affect opening plugins */
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
503
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
504
perror("fopen");
505
exitstatus = EXIT_FAILURE;
694
506
goto fallback;
695
507
}
696
508
}
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
509
699
510
if(custom_argv != NULL){
700
ret = argp_parse(&argp, custom_argc, custom_argv,
701
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
702
NULL, NULL);
703
switch(ret){
704
case 0:
705
break;
706
case ENOMEM:
707
default:
708
errno = ret;
709
error(0, errno, "argp_parse");
710
exitstatus = EX_OSERR;
711
goto fallback;
712
case EINVAL:
713
exitstatus = EX_CONFIG;
511
custom_argv[0] = argv[0];
512
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
513
if (ret == ARGP_ERR_UNKNOWN){
514
fprintf(stderr, "Unknown error while parsing arguments\n");
515
exitstatus = EXIT_FAILURE;
714
516
goto fallback;
715
517
}
716
518
}
717
519
718
/* Parse actual command line arguments, to let them override the
719
config file */
720
ret = argp_parse(&argp, argc, argv,
721
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
722
NULL, NULL);
723
switch(ret){
724
case 0:
725
break;
726
case ENOMEM:
727
default:
728
errno = ret;
729
error(0, errno, "argp_parse");
730
exitstatus = EX_OSERR;
731
goto fallback;
732
case EINVAL:
733
exitstatus = EX_USAGE;
734
goto fallback;
735
}
736
737
520
if(debug){
738
521
for(plugin *p = plugin_list; p != NULL; p=p->next){
739
522
fprintf(stderr, "Plugin: %s has %d arguments\n",
741
524
for(char **a = p->argv; *a != NULL; a++){
742
525
fprintf(stderr, "\tArg: %s\n", *a);
743
526
}
744
fprintf(stderr, "...and %d environment variables\n", p->envc);
527
fprintf(stderr, "...and %u environment variables\n", p->envc);
745
528
for(char **a = p->environ; *a != NULL; a++){
746
529
fprintf(stderr, "\t%s\n", *a);
747
530
}
748
531
}
749
532
}
750
533
751
if(getuid() == 0){
752
/* Work around Debian bug #633582:
753
<http://bugs.debian.org/633582> */
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
755
if(plugindir_fd == -1){
756
error(0, errno, "open");
757
} else {
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
759
if(ret == -1){
760
error(0, errno, "fstat");
761
} else {
762
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
763
ret = fchown(plugindir_fd, uid, gid);
764
if(ret == -1){
765
error(0, errno, "fchown");
766
}
767
}
768
}
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
770
}
534
ret = setuid(uid);
535
if (ret == -1){
536
perror("setuid");
771
537
}
772
538
773
/* Lower permissions */
774
539
setgid(gid);
775
if(ret == -1){
776
error(0, errno, "setgid");
777
}
778
ret = setuid(uid);
779
if(ret == -1){
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
540
if (ret == -1){
541
perror("setgid");
542
}
543
544
dir = opendir(plugindir);
545
if(dir == NULL){
546
perror("Could not open plugin dir");
547
exitstatus = EXIT_FAILURE;
548
goto fallback;
549
}
550
551
/* Set the FD_CLOEXEC flag on the directory, if possible */
784
552
{
785
int dir_fd = -1;
786
if(plugindir == NULL){
787
dir_fd = open(PDIR, O_RDONLY |
788
#ifdef O_CLOEXEC
789
O_CLOEXEC
790
#else /* not O_CLOEXEC */
791
0
792
#endif /* not O_CLOEXEC */
793
);
794
} else {
795
dir_fd = open(plugindir, O_RDONLY |
796
#ifdef O_CLOEXEC
797
O_CLOEXEC
798
#else /* not O_CLOEXEC */
799
0
800
#endif /* not O_CLOEXEC */
801
);
802
}
803
if(dir_fd == -1){
804
error(0, errno, "Could not open plugin dir");
805
exitstatus = EX_UNAVAILABLE;
806
goto fallback;
807
}
808
809
#ifndef O_CLOEXEC
810
/* Set the FD_CLOEXEC flag on the directory */
811
ret = set_cloexec_flag(dir_fd);
812
if(ret < 0){
813
error(0, errno, "set_cloexec_flag");
814
TEMP_FAILURE_RETRY(close(dir_fd));
815
exitstatus = EX_OSERR;
816
goto fallback;
817
}
818
#endif /* O_CLOEXEC */
819
820
dir = fdopendir(dir_fd);
821
if(dir == NULL){
822
error(0, errno, "Could not open plugin dir");
823
TEMP_FAILURE_RETRY(close(dir_fd));
824
exitstatus = EX_OSERR;
825
goto fallback;
553
int dir_fd = dirfd(dir);
554
if(dir_fd >= 0){
555
ret = set_cloexec_flag(dir_fd);
556
if(ret < 0){
557
perror("set_cloexec_flag");
558
exitstatus = EXIT_FAILURE;
559
goto fallback;
560
}
826
561
}
827
562
}
828
563
829
564
FD_ZERO(&rfds_all);
830
565
831
/* Read and execute any executable in the plugin directory*/
832
566
while(true){
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
567
dirst = readdir(dir);
836
568
837
/* All directory entries have been processed */
569
// All directory entries have been processed
838
570
if(dirst == NULL){
839
if(errno == EBADF){
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
571
if (errno == EBADF){
572
perror("readdir");
573
exitstatus = EXIT_FAILURE;
842
574
goto fallback;
843
575
}
844
576
break;
846
578
847
579
d_name_len = strlen(dirst->d_name);
848
580
849
/* Ignore dotfiles, backup files and other junk */
581
// Ignore dotfiles, backup files and other junk
850
582
{
851
583
bool bad_name = false;
852
584
854
586
855
587
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
856
588
".dpkg-old",
857
".dpkg-bak",
858
589
".dpkg-divert", NULL };
859
590
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
860
591
size_t pre_len = strlen(*pre);
868
599
break;
869
600
}
870
601
}
602
871
603
if(bad_name){
872
604
continue;
873
605
}
606
874
607
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
875
608
size_t suf_len = strlen(*suf);
876
609
if((d_name_len >= suf_len)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
610
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
878
611
== 0)){
879
612
if(debug){
880
613
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
622
continue;
890
623
}
891
624
}
892
625
893
626
char *filename;
894
if(plugindir == NULL){
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
897
} else {
898
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
899
plugindir,
900
dirst->d_name));
901
}
627
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
902
628
if(ret < 0){
903
error(0, errno, "asprintf");
629
perror("asprintf");
904
630
continue;
905
631
}
906
632
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
908
if(ret == -1){
909
error(0, errno, "stat");
633
ret = stat(filename, &st);
634
if (ret == -1){
635
perror("stat");
910
636
free(filename);
911
637
continue;
912
638
}
913
639
914
/* Ignore non-executable files */
915
if(not S_ISREG(st.st_mode)
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
640
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
917
641
if(debug){
918
642
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
919
643
" with bad type or mode\n", filename);
921
645
free(filename);
922
646
continue;
923
647
}
924
925
plugin *p = getplugin(dirst->d_name);
648
plugin *p = getplugin(dirst->d_name, &plugin_list);
926
649
if(p == NULL){
927
error(0, errno, "getplugin");
650
perror("getplugin");
928
651
free(filename);
929
652
continue;
930
653
}
938
661
}
939
662
{
940
663
/* Add global arguments to argument list for this plugin */
941
plugin *g = getplugin(NULL);
664
plugin *g = getplugin(NULL, &plugin_list);
942
665
if(g != NULL){
943
666
for(char **a = g->argv + 1; *a != NULL; a++){
944
667
if(not add_argument(p, *a)){
945
error(0, errno, "add_argument");
668
perror("add_argument");
946
669
}
947
670
}
948
671
/* Add global environment variables */
949
672
for(char **e = g->environ; *e != NULL; e++){
950
if(not add_environment(p, *e, false)){
951
error(0, errno, "add_environment");
673
if(not add_environment(p, *e)){
674
perror("add_environment");
952
675
}
953
676
}
954
677
}
958
681
process, too. */
959
682
if(p->environ[0] != NULL){
960
683
for(char **e = environ; *e != NULL; e++){
961
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
684
char *copy = strdup(*e);
685
if(copy == NULL){
686
perror("strdup");
687
continue;
688
}
689
if(not add_environment(p, copy)){
690
perror("add_environment");
963
691
}
964
692
}
965
693
}
966
694
967
695
int pipefd[2];
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
969
if(ret == -1){
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
696
ret = pipe(pipefd);
697
if (ret == -1){
698
perror("pipe");
699
exitstatus = EXIT_FAILURE;
972
700
goto fallback;
973
701
}
974
/* Ask OS to automatic close the pipe on exec */
975
702
ret = set_cloexec_flag(pipefd[0]);
976
703
if(ret < 0){
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
704
perror("set_cloexec_flag");
705
exitstatus = EXIT_FAILURE;
979
706
goto fallback;
980
707
}
981
708
ret = set_cloexec_flag(pipefd[1]);
982
709
if(ret < 0){
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
710
perror("set_cloexec_flag");
711
exitstatus = EXIT_FAILURE;
985
712
goto fallback;
986
713
}
987
714
/* Block SIGCHLD until process is safely in process list */
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
989
&sigchld_action.sa_mask,
990
NULL));
715
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
991
716
if(ret < 0){
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
717
perror("sigprocmask");
718
exitstatus = EXIT_FAILURE;
994
719
goto fallback;
995
720
}
996
/* Starting a new process to be watched */
997
pid_t pid;
998
do {
999
pid = fork();
1000
} while(pid == -1 and errno == EINTR);
721
// Starting a new process to be watched
722
pid_t pid = fork();
1001
723
if(pid == -1){
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
724
perror("fork");
725
exitstatus = EXIT_FAILURE;
1004
726
goto fallback;
1005
727
}
1006
728
if(pid == 0){
1007
729
/* this is the child process */
1008
730
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1009
731
if(ret < 0){
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
732
perror("sigaction");
733
_exit(EXIT_FAILURE);
1012
734
}
1013
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
735
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1014
736
if(ret < 0){
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
737
perror("sigprocmask");
738
_exit(EXIT_FAILURE);
1017
739
}
1018
740
1019
741
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1020
742
if(ret == -1){
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
743
perror("dup2");
744
_exit(EXIT_FAILURE);
1023
745
}
1024
746
1025
747
if(dirfd(dir) < 0){
1029
751
}
1030
752
if(p->environ[0] == NULL){
1031
753
if(execv(filename, p->argv) < 0){
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
754
perror("execv");
755
_exit(EXIT_FAILURE);
1034
756
}
1035
757
} else {
1036
758
if(execve(filename, p->argv, p->environ) < 0){
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
759
perror("execve");
760
_exit(EXIT_FAILURE);
1039
761
}
1040
762
}
1041
763
/* no return */
1042
764
}
1043
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
765
/* parent process */
1046
766
free(filename);
1047
plugin *new_plugin = getplugin(dirst->d_name);
1048
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
NULL)));
767
close(pipefd[1]); /* close unused write end of pipe */
768
process *new_process = malloc(sizeof(process));
769
if (new_process == NULL){
770
perror("malloc");
771
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1053
772
if(ret < 0){
1054
error(0, errno, "sigprocmask");
773
perror("sigprocmask");
1055
774
}
1056
exitstatus = EX_OSERR;
775
exitstatus = EXIT_FAILURE;
1057
776
goto fallback;
1058
777
}
1059
778
1060
new_plugin->pid = pid;
1061
new_plugin->fd = pipefd[0];
1062
779
*new_process = (struct process){ .pid = pid,
780
.fd = pipefd[0],
781
.next = process_list };
782
// List handling
783
process_list = new_process;
1063
784
/* Unblock SIGCHLD so signal handler can be run if this process
1064
785
has already completed */
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
786
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1068
787
if(ret < 0){
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
788
perror("sigprocmask");
789
exitstatus = EXIT_FAILURE;
1071
790
goto fallback;
1072
791
}
1073
792
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1075
-Wconversion */
793
FD_SET(new_process->fd, &rfds_all);
1076
794
1077
if(maxfd < new_plugin->fd){
1078
maxfd = new_plugin->fd;
795
if (maxfd < new_process->fd){
796
maxfd = new_process->fd;
1079
797
}
798
1080
799
}
1081
800
1082
TEMP_FAILURE_RETRY(closedir(dir));
801
free_plugin_list(plugin_list);
802
plugin_list = NULL;
803
804
closedir(dir);
1083
805
dir = NULL;
1084
free_plugin(getplugin(NULL));
1085
1086
for(plugin *p = plugin_list; p != NULL; p = p->next){
1087
if(p->pid != 0){
1088
break;
1089
}
1090
if(p->next == NULL){
1091
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1092
" directory?\n");
1093
free_plugin_list();
1094
}
806
807
if (process_list == NULL){
808
fprintf(stderr, "No plugin processes started. Incorrect plugin"
809
" directory?\n");
810
process_list = NULL;
1095
811
}
1096
1097
/* Main loop while running plugins exist */
1098
while(plugin_list){
812
while(process_list){
1099
813
fd_set rfds = rfds_all;
1100
814
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1101
if(select_ret == -1 and errno != EINTR){
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
815
if (select_ret == -1){
816
perror("select");
817
exitstatus = EXIT_FAILURE;
1104
818
goto fallback;
1105
819
}
1106
820
/* OK, now either a process completed, or something can be read
1107
821
from one of them */
1108
for(plugin *proc = plugin_list; proc != NULL;){
822
for(process *proc = process_list; proc ; proc = proc->next){
1109
823
/* Is this process completely done? */
1110
if(proc->completed and proc->eof){
824
if(proc->eof and proc->completed){
1111
825
/* Only accept the plugin output if it exited cleanly */
1112
826
if(not WIFEXITED(proc->status)
1113
827
or WEXITSTATUS(proc->status) != 0){
1114
828
/* Bad exit by plugin */
1115
1116
829
if(debug){
1117
830
if(WIFEXITED(proc->status)){
1118
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1119
" status %d\n", proc->name,
1120
(intmax_t) (proc->pid),
831
fprintf(stderr, "Plugin %u exited with status %d\n",
832
(unsigned int) (proc->pid),
1121
833
WEXITSTATUS(proc->status));
1122
} else if(WIFSIGNALED(proc->status)){
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1124
" signal %d: %s\n", proc->name,
1125
(intmax_t) (proc->pid),
1126
WTERMSIG(proc->status),
1127
strsignal(WTERMSIG(proc->status)));
834
} else if(WIFSIGNALED(proc->status)) {
835
fprintf(stderr, "Plugin %u killed by signal %d\n",
836
(unsigned int) (proc->pid),
837
WTERMSIG(proc->status));
1128
838
} else if(WCOREDUMP(proc->status)){
1129
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1130
" core\n", proc->name, (intmax_t) (proc->pid));
839
fprintf(stderr, "Plugin %d dumped core\n",
840
(unsigned int) (proc->pid));
1131
841
}
1132
842
}
1133
1134
843
/* Remove the plugin */
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1136
-Wconversion */
1137
844
FD_CLR(proc->fd, &rfds_all);
1138
845
/* Block signal while modifying process_list */
1139
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1140
(SIG_BLOCK,
1141
&sigchld_action.sa_mask,
1142
NULL));
846
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1143
847
if(ret < 0){
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
848
perror("sigprocmask");
849
exitstatus = EXIT_FAILURE;
1146
850
goto fallback;
1147
851
}
1148
1149
plugin *next_plugin = proc->next;
1150
free_plugin(proc);
1151
proc = next_plugin;
1152
852
/* Delete this process entry from the list */
853
if(process_list == proc){
854
/* First one - simple */
855
process_list = proc->next;
856
} else {
857
/* Second one or later */
858
for(process *p = process_list; p != NULL; p = p->next){
859
if(p->next == proc){
860
p->next = proc->next;
861
break;
862
}
863
}
864
}
1153
865
/* We are done modifying process list, so unblock signal */
1154
ret = (int)(TEMP_FAILURE_RETRY
1155
(sigprocmask(SIG_UNBLOCK,
1156
&sigchld_action.sa_mask, NULL)));
866
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
867
NULL);
1157
868
if(ret < 0){
1158
error(0, errno, "sigprocmask");
1159
exitstatus = EX_OSERR;
1160
goto fallback;
1161
}
1162
1163
if(plugin_list == NULL){
1164
break;
1165
}
1166
1167
continue;
869
perror("sigprocmask");
870
}
871
free(proc->buffer);
872
free(proc);
873
/* We deleted this process from the list, so we can't go
874
proc->next. Therefore, start over from the beginning of
875
the process list */
876
break;
1168
877
}
1169
1170
878
/* This process exited nicely, so print its buffer */
1171
1172
bool bret = print_out_password(proc->buffer,
1173
proc->buffer_length);
879
880
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1174
881
if(not bret){
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
882
perror("print_out_password");
883
exitstatus = EXIT_FAILURE;
1177
884
}
1178
885
goto fallback;
1179
886
}
1180
1181
887
/* This process has not completed. Does it have any output? */
1182
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1183
warning from
1184
-Wconversion */
888
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1185
889
/* This process had nothing to say at this time */
1186
proc = proc->next;
1187
890
continue;
1188
891
}
1189
892
/* Before reading, make the process' data buffer large enough */
1190
893
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1191
894
proc->buffer = realloc(proc->buffer, proc->buffer_size
1192
895
+ (size_t) BUFFER_SIZE);
1193
if(proc->buffer == NULL){
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
896
if (proc->buffer == NULL){
897
perror("malloc");
898
exitstatus = EXIT_FAILURE;
1196
899
goto fallback;
1197
900
}
1198
901
proc->buffer_size += BUFFER_SIZE;
1199
902
}
1200
903
/* Read from the process */
1201
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1202
proc->buffer
1203
+ proc->buffer_length,
1204
BUFFER_SIZE));
1205
if(sret < 0){
904
ret = read(proc->fd, proc->buffer + proc->buffer_length,
905
BUFFER_SIZE);
906
if(ret < 0){
1206
907
/* Read error from this process; ignore the error */
1207
proc = proc->next;
1208
908
continue;
1209
909
}
1210
if(sret == 0){
910
if(ret == 0){
1211
911
/* got EOF */
1212
912
proc->eof = true;
1213
913
} else {
1214
proc->buffer_length += (size_t) sret;
914
proc->buffer_length += (size_t) ret;
1215
915
}
1216
916
}
1217
917
}
1218
1219
918
919
1220
920
fallback:
1221
921
1222
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1223
and exitstatus != EX_OK)){
1224
/* Fallback if all plugins failed, none are found or an error
1225
occured */
922
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
923
/* Fallback if all plugins failed, none are found or an error occured */
1226
924
bool bret;
1227
925
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1228
926
char *passwordbuffer = getpass("Password: ");
1229
size_t len = strlen(passwordbuffer);
1230
/* Strip trailing newline */
1231
if(len > 0 and passwordbuffer[len-1] == '\n'){
1232
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1233
len--;
1234
}
1235
bret = print_out_password(passwordbuffer, len);
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1236
928
if(not bret){
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
929
perror("print_out_password");
930
exitstatus = EXIT_FAILURE;
1239
931
}
1240
932
}
1241
933
1242
934
/* Restore old signal handler */
1243
935
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1244
936
if(ret == -1){
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
937
perror("sigaction");
938
exitstatus = EXIT_FAILURE;
1247
939
}
1248
940
1249
941
if(custom_argv != NULL){
1250
for(char **arg = custom_argv+1; *arg != NULL; arg++){
942
for(char **arg = custom_argv; *arg != NULL; arg++){
1251
943
free(*arg);
1252
944
}
1253
945
free(custom_argv);
1254
946
}
947
free_plugin_list(plugin_list);
1255
948
1256
949
if(dir != NULL){
1257
950
closedir(dir);
1258
951
}
1259
952
1260
/* Kill the processes */
1261
for(plugin *p = plugin_list; p != NULL; p = p->next){
1262
if(p->pid != 0){
1263
close(p->fd);
1264
ret = kill(p->pid, SIGTERM);
1265
if(ret == -1 and errno != ESRCH){
1266
/* Set-uid proccesses might not get closed */
1267
error(0, errno, "kill");
1268
}
953
/* Free the process list and kill the processes */
954
for(process *next; process_list != NULL; process_list = next){
955
next = process_list->next;
956
close(process_list->fd);
957
ret = kill(process_list->pid, SIGTERM);
958
if(ret == -1 and errno != ESRCH){
959
/* set-uid proccesses migth not get closed */
960
perror("kill");
1269
961
}
962
free(process_list->buffer);
963
free(process_list);
1270
964
}
1271
965
1272
966
/* Wait for any remaining child processes to terminate */
1273
do {
967
do{
1274
968
ret = wait(NULL);
1275
969
} while(ret >= 0);
1276
970
if(errno != ECHILD){
1277
error(0, errno, "wait");
971
perror("wait");
1278
972
}
1279
973
1280
free_plugin_list();
1281
1282
free(plugindir);
1283
free(argfile);
1284
1285
974
return exitstatus;
1286
975
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0