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- Committer: Teddy Hogeborn
- Date: 2011-12-30 18:48:49 UTC
- mto: This revision was merged to the branch mainline in revision 541.
- Revision ID: teddy@recompile.se-20111230184849-fvec587apz6j54pn
* plugins.d/mandos-client.c (run_network_hooks): Bug fix: setenv()
takes three
arguments.
takes three
arguments.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files removed:
- network-protocol.txt
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- 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
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
asprintf(), O_CLOEXEC */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
35
36
uid_t, gid_t, getuid(), getgid(),
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
46
readdir(), closedir(), dirfd() */
45
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
48
fcntl(), setuid(), setgid(),
47
49
F_GETFD, F_SETFD, FD_CLOEXEC,
48
50
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
51
dup2(), STDOUT_FILENO, _exit(),
50
52
execv(), write(), read(),
51
53
close() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
55
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
58
61
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
60
64
#include <signal.h> /* struct sigaction, sigemptyset(),
61
65
sigaddset(), sigaction(),
62
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
63
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
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() */
65
75
66
76
#define BUFFER_SIZE 256
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;
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>";
85
83
86
84
typedef struct plugin{
87
85
char *name; /* can be NULL or any plugin name */
90
88
char **environ;
91
89
int envc;
92
90
bool disabled;
91
92
/* Variables used for running processes*/
93
pid_t pid;
94
int fd;
95
char *buffer;
96
size_t buffer_size;
97
size_t buffer_length;
98
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
93
101
struct plugin *next;
94
102
} plugin;
95
103
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))){
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))){
100
113
return p;
101
114
}
102
115
}
103
116
/* Create a new plugin */
104
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
106
122
return NULL;
107
123
}
108
*new_plugin = (plugin) { .name = name,
109
.argc = 1,
110
.envc = 0,
111
.disabled = false,
112
.next = *plugin_list };
113
114
new_plugin->argv = malloc(sizeof(char *) * 2);
115
if (new_plugin->argv == NULL){
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);
116
148
free(new_plugin);
149
errno = e;
117
150
return NULL;
118
151
}
119
new_plugin->argv[0] = name;
152
new_plugin->argv[0] = copy_name;
120
153
new_plugin->argv[1] = NULL;
121
122
new_plugin->environ = malloc(sizeof(char *));
154
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
123
158
if(new_plugin->environ == NULL){
159
int e = errno;
160
free(copy_name);
124
161
free(new_plugin->argv);
125
162
free(new_plugin);
163
errno = e;
126
164
return NULL;
127
165
}
128
166
new_plugin->environ[0] = NULL;
167
129
168
/* Append the new plugin to the list */
130
*plugin_list = new_plugin;
169
plugin_list = new_plugin;
131
170
return new_plugin;
132
171
}
133
172
134
173
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
135
175
static bool add_to_char_array(const char *new, char ***array,
136
176
int *len){
137
177
/* Resize the pointed-to array to hold one more pointer */
138
*array = realloc(*array, sizeof(char *)
139
* (size_t) ((*len) + 2));
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
140
182
/* Malloc check */
141
183
if(*array == NULL){
142
184
return false;
143
185
}
144
186
/* Make a copy of the new string */
145
char *copy = strdup(new);
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
146
191
if(copy == NULL){
147
192
return false;
148
193
}
155
200
}
156
201
157
202
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
158
204
static bool add_argument(plugin *p, const char *arg){
159
205
if(p == NULL){
160
206
return false;
163
209
}
164
210
165
211
/* Add to a plugin's environment */
166
static bool add_environment(plugin *p, const char *def){
212
__attribute__((nonnull(2)))
213
static bool add_environment(plugin *p, const char *def, bool replace){
167
214
if(p == NULL){
168
215
return false;
169
216
}
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
}
170
237
return add_to_char_array(def, &(p->environ), &(p->envc));
171
238
}
172
239
173
174
240
/*
175
241
* Based on the example in the GNU LibC manual chapter 13.13 "File
176
242
* Descriptor Flags".
177
* *Note File Descriptor Flags:(libc)Descriptor Flags.
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
178
244
*/
179
static int set_cloexec_flag(int fd)
180
{
181
int ret = fcntl(fd, F_GETFD, 0);
245
static int set_cloexec_flag(int fd){
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
182
247
/* If reading the flags failed, return error indication now. */
183
248
if(ret < 0){
184
249
return ret;
185
250
}
186
251
/* Store modified flag word in the descriptor. */
187
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
188
254
}
189
255
190
process *process_list = NULL;
191
256
192
/* Mark a process as completed when it exits, and save its exit
257
/* Mark processes as completed when they exit, and save their exit
193
258
status. */
194
void handle_sigchld(__attribute__((unused)) int sig){
195
process *proc = process_list;
196
int status;
197
pid_t pid = wait(&status);
198
if(pid == -1){
199
perror("wait");
200
return;
201
}
202
while(proc != NULL and proc->pid != pid){
203
proc = proc->next;
204
}
205
if(proc == NULL){
206
/* Process not found in process list */
207
return;
208
}
209
proc->status = status;
210
proc->completed = true;
259
static void handle_sigchld(__attribute__((unused)) int sig){
260
int old_errno = errno;
261
while(true){
262
plugin *proc = plugin_list;
263
int status;
264
pid_t pid = waitpid(-1, &status, WNOHANG);
265
if(pid == 0){
266
/* Only still running child processes */
267
break;
268
}
269
if(pid == -1){
270
if(errno == ECHILD){
271
/* No child processes */
272
break;
273
}
274
error(0, errno, "waitpid");
275
}
276
277
/* A child exited, find it in process_list */
278
while(proc != NULL and proc->pid != pid){
279
proc = proc->next;
280
}
281
if(proc == NULL){
282
/* Process not found in process list */
283
continue;
284
}
285
proc->status = status;
286
proc->completed = 1;
287
}
288
errno = old_errno;
211
289
}
212
290
213
bool print_out_password(const char *buffer, size_t length){
291
/* Prints out a password to stdout */
292
__attribute__((nonnull))
293
static bool print_out_password(const char *buffer, size_t length){
214
294
ssize_t ret;
215
if(length>0 and buffer[length-1] == '\n'){
216
length--;
217
}
218
295
for(size_t written = 0; written < length; written += (size_t)ret){
219
296
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
220
297
length - written));
225
302
return true;
226
303
}
227
304
228
char **add_to_argv(char **argv, int *argc, char *arg){
229
if (argv == NULL){
230
*argc = 1;
231
argv = malloc(sizeof(char*) * 2);
232
if(argv == NULL){
233
return NULL;
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
}
234
330
}
235
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
236
argv[1] = NULL;
237
}
238
*argc += 1;
239
argv = realloc(argv, sizeof(char *)
240
* ((unsigned int) *argc + 1));
241
if(argv == NULL){
242
return NULL;
243
}
244
argv[*argc-1] = arg;
245
argv[*argc] = NULL;
246
return argv;
331
}
332
333
free(plugin_node);
334
}
335
336
static void free_plugin_list(void){
337
while(plugin_list != NULL){
338
free_plugin(plugin_list);
339
}
247
340
}
248
341
249
342
int main(int argc, char *argv[]){
250
const char *plugindir = "/lib/mandos/plugins.d";
251
const char *argfile = ARGFILE;
343
char *plugindir = NULL;
344
char *argfile = NULL;
252
345
FILE *conffp;
253
346
size_t d_name_len;
254
347
DIR *dir = NULL;
256
349
struct stat st;
257
350
fd_set rfds_all;
258
351
int ret, maxfd = 0;
352
ssize_t sret;
259
353
uid_t uid = 65534;
260
354
gid_t gid = 65534;
261
355
bool debug = false;
269
363
/* Establish a signal handler */
270
364
sigemptyset(&sigchld_action.sa_mask);
271
365
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
272
if(ret < 0){
273
perror("sigaddset");
274
exit(EXIT_FAILURE);
366
if(ret == -1){
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
369
goto fallback;
275
370
}
276
371
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
277
if(ret < 0){
278
perror("sigaction");
279
exit(EXIT_FAILURE);
372
if(ret == -1){
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
375
goto fallback;
280
376
}
281
377
282
378
/* The options we understand. */
284
380
{ .name = "global-options", .key = 'g',
285
381
.arg = "OPTION[,OPTION[,...]]",
286
382
.doc = "Options passed to all plugins" },
287
{ .name = "global-envs", .key = 'e',
383
{ .name = "global-env", .key = 'G',
288
384
.arg = "VAR=value",
289
385
.doc = "Environment variable passed to all plugins" },
290
386
{ .name = "options-for", .key = 'o',
291
387
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
292
388
.doc = "Options passed only to specified plugin" },
293
{ .name = "envs-for", .key = 'f',
389
{ .name = "env-for", .key = 'E',
294
390
.arg = "PLUGIN:ENV=value",
295
391
.doc = "Environment variable passed to specified plugin" },
296
392
{ .name = "disable", .key = 'd',
297
393
.arg = "PLUGIN",
298
394
.doc = "Disable a specific plugin", .group = 1 },
395
{ .name = "enable", .key = 'e',
396
.arg = "PLUGIN",
397
.doc = "Enable a specific plugin", .group = 1 },
299
398
{ .name = "plugin-dir", .key = 128,
300
399
.arg = "DIRECTORY",
301
400
.doc = "Specify a different plugin directory", .group = 2 },
302
{ .name = "userid", .key = 129,
303
.arg = "ID", .flags = 0,
304
.doc = "User ID the plugins will run as", .group = 2 },
305
{ .name = "groupid", .key = 130,
306
.arg = "ID", .flags = 0,
307
.doc = "Group ID the plugins will run as", .group = 2 },
308
{ .name = "debug", .key = 131,
309
.doc = "Debug mode", .group = 3 },
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 },
310
421
{ .name = NULL }
311
422
};
312
423
313
error_t parse_opt (int key, char *arg, struct argp_state *state) {
314
/* Get the INPUT argument from `argp_parse', which we know is a
315
pointer to our plugin list pointer. */
316
plugin **plugins = state->input;
317
switch (key) {
318
case 'g':
319
if (arg != NULL){
320
char *p;
321
while((p = strsep(&arg, ",")) != NULL){
322
if(p[0] == '\0'){
323
continue;
324
}
325
if(not add_argument(getplugin(NULL, plugins), p)){
326
perror("add_argument");
327
return ARGP_ERR_UNKNOWN;
328
}
329
}
330
}
331
break;
332
case 'e':
333
if(arg == NULL){
334
break;
335
}
336
{
337
char *envdef = strdup(arg);
338
if(envdef == NULL){
339
break;
340
}
341
if(not add_environment(getplugin(NULL, plugins), envdef)){
342
perror("add_environment");
343
}
344
}
345
break;
346
case 'o':
347
if (arg != NULL){
348
char *p_name = strsep(&arg, ":");
349
if(p_name[0] == '\0'){
350
break;
351
}
352
char *opt = strsep(&arg, ":");
353
if(opt[0] == '\0'){
354
break;
355
}
356
if(opt != NULL){
357
char *p;
358
while((p = strsep(&opt, ",")) != NULL){
359
if(p[0] == '\0'){
360
continue;
361
}
362
if(not add_argument(getplugin(p_name, plugins), p)){
363
perror("add_argument");
364
return ARGP_ERR_UNKNOWN;
365
}
366
}
367
}
368
}
369
break;
370
case 'f':
371
if(arg == NULL){
372
break;
373
}
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 tmpmax;
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 */
374
467
{
375
468
char *envdef = strchr(arg, ':');
376
469
if(envdef == NULL){
377
break;
378
}
379
char *p_name = strndup(arg, (size_t) (envdef-arg));
380
if(p_name == NULL){
381
break;
382
}
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
472
break;
473
}
474
*envdef = '\0';
383
475
envdef++;
384
if(not add_environment(getplugin(p_name, plugins), envdef)){
385
perror("add_environment");
386
}
387
}
388
break;
389
case 'd':
390
if (arg != NULL){
391
plugin *p = getplugin(arg, plugins);
392
if(p == NULL){
393
return ARGP_ERR_UNKNOWN;
394
}
395
p->disabled = true;
396
}
397
break;
398
case 128:
399
plugindir = arg;
400
break;
401
case 129:
402
uid = (uid_t)strtol(arg, NULL, 10);
403
break;
404
case 130:
405
gid = (gid_t)strtol(arg, NULL, 10);
406
break;
407
case 131:
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
tmpmax = strtoimax(arg, &tmp, 10);
509
if(errno != 0 or tmp == arg or *tmp != '\0'
510
or tmpmax != (uid_t)tmpmax){
511
argp_error(state, "Bad user ID number: \"%s\", using %"
512
PRIdMAX, arg, (intmax_t)uid);
513
break;
514
}
515
uid = (uid_t)tmpmax;
516
break;
517
case 131: /* --groupid */
518
tmpmax = strtoimax(arg, &tmp, 10);
519
if(errno != 0 or tmp == arg or *tmp != '\0'
520
or tmpmax != (gid_t)tmpmax){
521
argp_error(state, "Bad group ID number: \"%s\", using %"
522
PRIdMAX, arg, (intmax_t)gid);
523
break;
524
}
525
gid = (gid_t)tmpmax;
526
break;
527
case 132: /* --debug */
408
528
debug = true;
409
529
break;
410
case ARGP_KEY_ARG:
411
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
412
break;
413
case ARGP_KEY_END:
414
break;
415
default:
416
return ARGP_ERR_UNKNOWN;
417
}
418
return 0;
419
}
420
421
plugin *plugin_list = NULL;
422
423
struct argp argp = { .options = options, .parser = parse_opt,
424
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
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 = "",
425
597
.doc = "Mandos plugin runner -- Run plugins" };
426
598
427
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
428
if (ret == ARGP_ERR_UNKNOWN){
429
fprintf(stderr, "Unknown error while parsing arguments\n");
430
exitstatus = EXIT_FAILURE;
431
goto end;
432
}
433
434
conffp = fopen(argfile, "r");
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
}
435
627
if(conffp != NULL){
436
628
char *org_line = NULL;
629
char *p, *arg, *new_arg, *line;
437
630
size_t size = 0;
438
ssize_t sret;
439
char *p, *arg, *new_arg, *line;
440
631
const char whitespace_delims[] = " \r\t\f\v\n";
441
632
const char comment_delim[] = "#";
442
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 */
443
646
while(true){
444
647
sret = getline(&org_line, &size, conffp);
445
648
if(sret == -1){
446
649
break;
447
650
}
448
651
449
652
line = org_line;
450
653
arg = strsep(&line, comment_delim);
451
654
while((p = strsep(&arg, whitespace_delims)) != NULL){
453
656
continue;
454
657
}
455
658
new_arg = strdup(p);
456
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
457
if (custom_argv == NULL){
458
perror("add_to_argv");
459
exitstatus = EXIT_FAILURE;
460
goto end;
461
}
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;
462
677
}
463
678
}
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
}
464
687
free(org_line);
465
} else{
688
} else {
466
689
/* Check for harmful errors and go to fallback. Other errors might
467
690
not affect opening plugins */
468
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
469
perror("fopen");
470
exitstatus = EXIT_FAILURE;
471
goto end;
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
694
goto fallback;
472
695
}
473
696
}
474
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
475
699
if(custom_argv != NULL){
476
custom_argv[0] = argv[0];
477
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
478
if (ret == ARGP_ERR_UNKNOWN){
479
fprintf(stderr, "Unknown error while parsing arguments\n");
480
exitstatus = EXIT_FAILURE;
481
goto end;
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;
714
goto fallback;
482
715
}
483
716
}
484
717
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
485
737
if(debug){
486
738
for(plugin *p = plugin_list; p != NULL; p=p->next){
487
739
fprintf(stderr, "Plugin: %s has %d arguments\n",
489
741
for(char **a = p->argv; *a != NULL; a++){
490
742
fprintf(stderr, "\tArg: %s\n", *a);
491
743
}
492
fprintf(stderr, "...and %u environment variables\n", p->envc);
744
fprintf(stderr, "...and %d environment variables\n", p->envc);
493
745
for(char **a = p->environ; *a != NULL; a++){
494
746
fprintf(stderr, "\t%s\n", *a);
495
747
}
496
748
}
497
749
}
498
750
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
}
771
}
772
773
/* Lower permissions */
774
setgid(gid);
775
if(ret == -1){
776
error(0, errno, "setgid");
777
}
499
778
ret = setuid(uid);
500
if (ret == -1){
501
perror("setuid");
502
}
503
504
setgid(gid);
505
if (ret == -1){
506
perror("setgid");
507
}
508
509
dir = opendir(plugindir);
510
if(dir == NULL){
511
perror("Could not open plugin dir");
512
exitstatus = EXIT_FAILURE;
513
goto end;
514
}
515
516
/* Set the FD_CLOEXEC flag on the directory, if possible */
779
if(ret == -1){
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
517
784
{
518
int dir_fd = dirfd(dir);
519
if(dir_fd >= 0){
520
ret = set_cloexec_flag(dir_fd);
521
if(ret < 0){
522
perror("set_cloexec_flag");
523
exitstatus = EXIT_FAILURE;
524
goto end;
525
}
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;
526
826
}
527
827
}
528
828
529
829
FD_ZERO(&rfds_all);
530
830
831
/* Read and execute any executable in the plugin directory*/
531
832
while(true){
532
dirst = readdir(dir);
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
533
836
534
// All directory entries have been processed
837
/* All directory entries have been processed */
535
838
if(dirst == NULL){
536
if (errno == EBADF){
537
perror("readdir");
538
exitstatus = EXIT_FAILURE;
539
goto end;
839
if(errno == EBADF){
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
842
goto fallback;
540
843
}
541
844
break;
542
845
}
543
846
544
847
d_name_len = strlen(dirst->d_name);
545
848
546
// Ignore dotfiles, backup files and other junk
849
/* Ignore dotfiles, backup files and other junk */
547
850
{
548
851
bool bad_name = false;
549
852
551
854
552
855
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
553
856
".dpkg-old",
857
".dpkg-bak",
554
858
".dpkg-divert", NULL };
555
859
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
556
860
size_t pre_len = strlen(*pre);
564
868
break;
565
869
}
566
870
}
567
568
871
if(bad_name){
569
872
continue;
570
873
}
571
572
874
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
573
875
size_t suf_len = strlen(*suf);
574
876
if((d_name_len >= suf_len)
575
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
576
878
== 0)){
577
879
if(debug){
578
880
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
587
889
continue;
588
890
}
589
891
}
590
892
591
893
char *filename;
592
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
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
}
593
902
if(ret < 0){
594
perror("asprintf");
903
error(0, errno, "asprintf");
595
904
continue;
596
905
}
597
906
598
ret = stat(filename, &st);
599
if (ret == -1){
600
perror("stat");
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
908
if(ret == -1){
909
error(0, errno, "stat");
601
910
free(filename);
602
911
continue;
603
912
}
604
913
605
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
914
/* Ignore non-executable files */
915
if(not S_ISREG(st.st_mode)
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
606
917
if(debug){
607
918
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
608
919
" with bad type or mode\n", filename);
610
921
free(filename);
611
922
continue;
612
923
}
613
plugin *p = getplugin(dirst->d_name, &plugin_list);
924
925
plugin *p = getplugin(dirst->d_name);
614
926
if(p == NULL){
615
perror("getplugin");
927
error(0, errno, "getplugin");
616
928
free(filename);
617
929
continue;
618
930
}
626
938
}
627
939
{
628
940
/* Add global arguments to argument list for this plugin */
629
plugin *g = getplugin(NULL, &plugin_list);
941
plugin *g = getplugin(NULL);
630
942
if(g != NULL){
631
943
for(char **a = g->argv + 1; *a != NULL; a++){
632
944
if(not add_argument(p, *a)){
633
perror("add_argument");
945
error(0, errno, "add_argument");
634
946
}
635
947
}
636
948
/* Add global environment variables */
637
949
for(char **e = g->environ; *e != NULL; e++){
638
if(not add_environment(p, *e)){
639
perror("add_environment");
950
if(not add_environment(p, *e, false)){
951
error(0, errno, "add_environment");
640
952
}
641
953
}
642
954
}
646
958
process, too. */
647
959
if(p->environ[0] != NULL){
648
960
for(char **e = environ; *e != NULL; e++){
649
char *copy = strdup(*e);
650
if(copy == NULL){
651
perror("strdup");
652
continue;
653
}
654
if(not add_environment(p, copy)){
655
perror("add_environment");
961
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
656
963
}
657
964
}
658
965
}
659
966
660
int pipefd[2];
661
ret = pipe(pipefd);
662
if (ret == -1){
663
perror("pipe");
664
exitstatus = EXIT_FAILURE;
665
goto end;
967
int pipefd[2];
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
969
if(ret == -1){
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
972
goto fallback;
666
973
}
974
/* Ask OS to automatic close the pipe on exec */
667
975
ret = set_cloexec_flag(pipefd[0]);
668
976
if(ret < 0){
669
perror("set_cloexec_flag");
670
exitstatus = EXIT_FAILURE;
671
goto end;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
979
goto fallback;
672
980
}
673
981
ret = set_cloexec_flag(pipefd[1]);
674
982
if(ret < 0){
675
perror("set_cloexec_flag");
676
exitstatus = EXIT_FAILURE;
677
goto end;
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
985
goto fallback;
678
986
}
679
987
/* Block SIGCHLD until process is safely in process list */
680
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
989
&sigchld_action.sa_mask,
990
NULL));
681
991
if(ret < 0){
682
perror("sigprocmask");
683
exitstatus = EXIT_FAILURE;
684
goto end;
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
994
goto fallback;
685
995
}
686
// Starting a new process to be watched
687
pid_t pid = fork();
996
/* Starting a new process to be watched */
997
pid_t pid;
998
do {
999
pid = fork();
1000
} while(pid == -1 and errno == EINTR);
688
1001
if(pid == -1){
689
perror("fork");
690
exitstatus = EXIT_FAILURE;
691
goto end;
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
1004
goto fallback;
692
1005
}
693
1006
if(pid == 0){
694
1007
/* this is the child process */
695
1008
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
696
1009
if(ret < 0){
697
perror("sigaction");
698
_exit(EXIT_FAILURE);
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
699
1012
}
700
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1013
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
701
1014
if(ret < 0){
702
perror("sigprocmask");
703
_exit(EXIT_FAILURE);
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
704
1017
}
705
1018
706
1019
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
707
1020
if(ret == -1){
708
perror("dup2");
709
_exit(EXIT_FAILURE);
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
710
1023
}
711
1024
712
1025
if(dirfd(dir) < 0){
716
1029
}
717
1030
if(p->environ[0] == NULL){
718
1031
if(execv(filename, p->argv) < 0){
719
perror("execv");
720
_exit(EXIT_FAILURE);
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
721
1034
}
722
1035
} else {
723
1036
if(execve(filename, p->argv, p->environ) < 0){
724
perror("execve");
725
_exit(EXIT_FAILURE);
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
726
1039
}
727
1040
}
728
1041
/* no return */
729
1042
}
730
/* parent process */
1043
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
731
1046
free(filename);
732
close(pipefd[1]); /* close unused write end of pipe */
733
process *new_process = malloc(sizeof(process));
734
if (new_process == NULL){
735
perror("malloc");
736
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
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)));
737
1053
if(ret < 0){
738
perror("sigprocmask");
1054
error(0, errno, "sigprocmask");
739
1055
}
740
exitstatus = EXIT_FAILURE;
741
goto end;
1056
exitstatus = EX_OSERR;
1057
goto fallback;
742
1058
}
743
1059
744
*new_process = (struct process){ .pid = pid,
745
.fd = pipefd[0],
746
.next = process_list };
747
// List handling
748
process_list = new_process;
1060
new_plugin->pid = pid;
1061
new_plugin->fd = pipefd[0];
1062
749
1063
/* Unblock SIGCHLD so signal handler can be run if this process
750
1064
has already completed */
751
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
752
1068
if(ret < 0){
753
perror("sigprocmask");
754
exitstatus = EXIT_FAILURE;
755
goto end;
756
}
757
758
FD_SET(new_process->fd, &rfds_all);
759
760
if (maxfd < new_process->fd){
761
maxfd = new_process->fd;
762
}
763
764
}
765
766
/* Free the plugin list */
767
for(plugin *next; plugin_list != NULL; plugin_list = next){
768
next = plugin_list->next;
769
free(plugin_list->argv);
770
if(plugin_list->environ[0] != NULL){
771
for(char **e = plugin_list->environ; *e != NULL; e++){
772
free(*e);
773
}
774
}
775
free(plugin_list);
776
}
777
778
closedir(dir);
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
1071
goto fallback;
1072
}
1073
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1075
-Wconversion */
1076
1077
if(maxfd < new_plugin->fd){
1078
maxfd = new_plugin->fd;
1079
}
1080
}
1081
1082
TEMP_FAILURE_RETRY(closedir(dir));
779
1083
dir = NULL;
780
781
if (process_list == NULL){
782
fprintf(stderr, "No plugin processes started. Incorrect plugin"
783
" directory?\n");
784
process_list = 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
}
785
1095
}
786
while(process_list){
1096
1097
/* Main loop while running plugins exist */
1098
while(plugin_list){
787
1099
fd_set rfds = rfds_all;
788
1100
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
789
if (select_ret == -1){
790
perror("select");
791
exitstatus = EXIT_FAILURE;
792
goto end;
1101
if(select_ret == -1 and errno != EINTR){
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
1104
goto fallback;
793
1105
}
794
1106
/* OK, now either a process completed, or something can be read
795
1107
from one of them */
796
for(process *proc = process_list; proc ; proc = proc->next){
1108
for(plugin *proc = plugin_list; proc != NULL;){
797
1109
/* Is this process completely done? */
798
if(proc->eof and proc->completed){
1110
if(proc->completed and proc->eof){
799
1111
/* Only accept the plugin output if it exited cleanly */
800
1112
if(not WIFEXITED(proc->status)
801
1113
or WEXITSTATUS(proc->status) != 0){
802
1114
/* Bad exit by plugin */
1115
803
1116
if(debug){
804
1117
if(WIFEXITED(proc->status)){
805
fprintf(stderr, "Plugin %u exited with status %d\n",
806
(unsigned int) (proc->pid),
1118
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1119
" status %d\n", proc->name,
1120
(intmax_t) (proc->pid),
807
1121
WEXITSTATUS(proc->status));
808
} else if(WIFSIGNALED(proc->status)) {
809
fprintf(stderr, "Plugin %u killed by signal %d\n",
810
(unsigned int) (proc->pid),
811
WTERMSIG(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)));
812
1128
} else if(WCOREDUMP(proc->status)){
813
fprintf(stderr, "Plugin %d dumped core\n",
814
(unsigned int) (proc->pid));
1129
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1130
" core\n", proc->name, (intmax_t) (proc->pid));
815
1131
}
816
1132
}
1133
817
1134
/* Remove the plugin */
818
FD_CLR(proc->fd, &rfds_all);
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1136
-Wconversion */
1137
819
1138
/* Block signal while modifying process_list */
820
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1139
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1140
(SIG_BLOCK,
1141
&sigchld_action.sa_mask,
1142
NULL));
821
1143
if(ret < 0){
822
perror("sigprocmask");
823
exitstatus = EXIT_FAILURE;
824
goto end;
825
}
826
/* Delete this process entry from the list */
827
if(process_list == proc){
828
/* First one - simple */
829
process_list = proc->next;
830
} else {
831
/* Second one or later */
832
for(process *p = process_list; p != NULL; p = p->next){
833
if(p->next == proc){
834
p->next = proc->next;
835
break;
836
}
837
}
838
}
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
1146
goto fallback;
1147
}
1148
1149
plugin *next_plugin = proc->next;
1150
free_plugin(proc);
1151
proc = next_plugin;
1152
839
1153
/* We are done modifying process list, so unblock signal */
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
841
NULL);
1154
ret = (int)(TEMP_FAILURE_RETRY
1155
(sigprocmask(SIG_UNBLOCK,
1156
&sigchld_action.sa_mask, NULL)));
842
1157
if(ret < 0){
843
perror("sigprocmask");
844
}
845
free(proc->buffer);
846
free(proc);
847
/* We deleted this process from the list, so we can't go
848
proc->next. Therefore, start over from the beginning of
849
the process list */
850
break;
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;
851
1168
}
1169
852
1170
/* This process exited nicely, so print its buffer */
853
854
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1171
1172
bool bret = print_out_password(proc->buffer,
1173
proc->buffer_length);
855
1174
if(not bret){
856
perror("print_out_password");
857
exitstatus = EXIT_FAILURE;
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
858
1177
}
859
goto end;
1178
goto fallback;
860
1179
}
1180
861
1181
/* This process has not completed. Does it have any output? */
862
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1182
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1183
warning from
1184
-Wconversion */
863
1185
/* This process had nothing to say at this time */
1186
proc = proc->next;
864
1187
continue;
865
1188
}
866
1189
/* Before reading, make the process' data buffer large enough */
867
1190
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
868
1191
proc->buffer = realloc(proc->buffer, proc->buffer_size
869
1192
+ (size_t) BUFFER_SIZE);
870
if (proc->buffer == NULL){
871
perror("malloc");
872
exitstatus = EXIT_FAILURE;
873
goto end;
1193
if(proc->buffer == NULL){
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
1196
goto fallback;
874
1197
}
875
1198
proc->buffer_size += BUFFER_SIZE;
876
1199
}
877
1200
/* Read from the process */
878
ret = read(proc->fd, proc->buffer + proc->buffer_length,
879
BUFFER_SIZE);
880
if(ret < 0){
1201
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1202
proc->buffer
1203
+ proc->buffer_length,
1204
BUFFER_SIZE));
1205
if(sret < 0){
881
1206
/* Read error from this process; ignore the error */
1207
proc = proc->next;
882
1208
continue;
883
1209
}
884
if(ret == 0){
1210
if(sret == 0){
885
1211
/* got EOF */
886
1212
proc->eof = true;
887
1213
} else {
888
proc->buffer_length += (size_t) ret;
1214
proc->buffer_length += (size_t) sret;
889
1215
}
890
1216
}
891
1217
}
892
893
894
end:
895
896
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
897
/* Fallback if all plugins failed, none are found or an error occured */
1218
1219
1220
fallback:
1221
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 */
898
1226
bool bret;
899
1227
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
900
1228
char *passwordbuffer = getpass("Password: ");
901
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
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);
902
1236
if(not bret){
903
perror("print_out_password");
904
exitstatus = EXIT_FAILURE;
905
goto end;
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
906
1239
}
907
1240
}
908
1241
909
1242
/* Restore old signal handler */
910
sigaction(SIGCHLD, &old_sigchld_action, NULL);
911
912
free(custom_argv);
913
914
/* Free the plugin list */
915
for(plugin *next; plugin_list != NULL; plugin_list = next){
916
next = plugin_list->next;
917
free(plugin_list->argv);
918
if(plugin_list->environ[0] != NULL){
919
for(char **e = plugin_list->environ; *e != NULL; e++){
920
free(*e);
921
}
1243
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1244
if(ret == -1){
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
1247
}
1248
1249
if(custom_argv != NULL){
1250
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1251
free(*arg);
922
1252
}
923
free(plugin_list->environ);
924
free(plugin_list);
1253
free(custom_argv);
925
1254
}
926
1255
927
1256
if(dir != NULL){
928
1257
closedir(dir);
929
1258
}
930
1259
931
/* Free the process list and kill the processes */
932
for(process *next; process_list != NULL; process_list = next){
933
next = process_list->next;
934
close(process_list->fd);
935
ret = kill(process_list->pid, SIGTERM);
936
if(ret == -1 and errno != ESRCH){
937
/* set-uid proccesses migth not get closed */
938
perror("kill");
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
}
939
1269
}
940
free(process_list->buffer);
941
free(process_list);
942
1270
}
943
1271
944
1272
/* Wait for any remaining child processes to terminate */
945
do{
1273
do {
946
1274
ret = wait(NULL);
947
1275
} while(ret >= 0);
948
1276
if(errno != ECHILD){
949
perror("wait");
1277
error(0, errno, "wait");
950
1278
}
951
1279
1280
free_plugin_list();
1281
1282
free(plugindir);
1283
free(argfile);
1284
952
1285
return exitstatus;
953
1286
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0