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- Committer: Teddy Hogeborn
- Date: 2014-06-14 22:55:11 UTC
- Revision ID: teddy@recompile.se-20140614225511-0ge6tce2esulf65t
In plugin-runner, do scandirat() or scandir() instead of readdir().
* plugin-runner.c (set_cloexec_flag): Only define if O_CLOEXEC is not
defined, it is not called
otherwise.
(main): Remove variables "dir" and "dirst"; new variable "dir_fd".
Use scandirat() if available, scandir() otherwise, both
using new filter function "good_name". Removed checking of
plugin file name patterns; this is now done by "good_name".
Do not set FD_CLOEXEC flag on plugin_fd, since fexecve()
will not work with it. Use pipe2() to set O_CLOEXEC on pipe
FD's (if possible).
(main/good_name): New filter function for scandirat() or scandir().
* plugin-runner.c (set_cloexec_flag): Only define if O_CLOEXEC is not
defined, it is not called
otherwise.
(main): Remove variables "dir" and "dirst"; new variable "dir_fd".
Use scandirat() if available, scandir() otherwise, both
using new filter function "good_name". Removed checking of
plugin file name patterns; this is now done by "good_name".
Do not set FD_CLOEXEC flag on plugin_fd, since fexecve()
will not work with it. Use pipe2() to set O_CLOEXEC on pipe
FD's (if possible).
(main/good_name): New filter function for scandirat() or scandir().
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- 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 © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
20
21
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
22
23
*/
23
24
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
O_CLOEXEC, pipe2() */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
37
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
38
FD_SET(), FD_ISSET(), FD_CLR */
39
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
40
WEXITSTATUS(), WTERMSIG(),
41
WCOREDUMP() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
43
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
56
57
#include <errno.h> /* errno */
57
58
#include <argp.h> /* struct argp_option, struct
58
59
argp_state, struct argp,
59
60
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
61
ARGP_KEY_END, ARGP_KEY_ARG,
62
error_t */
61
63
#include <signal.h> /* struct sigaction, sigemptyset(),
62
64
sigaddset(), sigaction(),
63
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
68
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
69
struct process;
70
71
typedef struct process{
78
#define PDIR "/lib/mandos/plugins.d"
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
83
84
typedef struct plugin{
85
char *name; /* can be NULL or any plugin name */
86
char **argv;
87
int argc;
88
char **environ;
89
int envc;
90
bool disabled;
91
92
/* Variables used for running processes*/
72
93
pid_t pid;
73
94
int fd;
74
95
char *buffer;
75
96
size_t buffer_size;
76
97
size_t buffer_length;
77
98
bool eof;
78
bool completed;
99
volatile sig_atomic_t completed;
79
100
int status;
80
struct process *next;
81
} process;
82
83
typedef struct plugin{
84
char *name; /* can be NULL or any plugin name */
85
char **argv;
86
int argc;
87
bool disabled;
88
101
struct plugin *next;
89
102
} plugin;
90
103
91
static plugin *getplugin(char *name, plugin **plugin_list){
92
for (plugin *p = *plugin_list; p != NULL; p = p->next){
93
if ((p->name == name)
94
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
__attribute__((warn_unused_result))
109
static plugin *getplugin(char *name){
110
/* Check for existing plugin with that name */
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
if((p->name == name)
113
or (p->name and name and (strcmp(p->name, name) == 0))){
95
114
return p;
96
115
}
97
116
}
98
117
/* Create a new plugin */
99
plugin *new_plugin = malloc(sizeof(plugin));
100
if (new_plugin == NULL){
101
perror("malloc");
102
exit(EXIT_FAILURE);
103
}
104
new_plugin->name = name;
105
new_plugin->argv = malloc(sizeof(char *) * 2);
106
if (new_plugin->argv == NULL){
107
perror("malloc");
108
exit(EXIT_FAILURE);
109
}
110
new_plugin->argv[0] = name;
118
plugin *new_plugin = NULL;
119
do {
120
new_plugin = malloc(sizeof(plugin));
121
} while(new_plugin == NULL and errno == EINTR);
122
if(new_plugin == NULL){
123
return NULL;
124
}
125
char *copy_name = NULL;
126
if(name != NULL){
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
130
if(copy_name == NULL){
131
int e = errno;
132
free(new_plugin);
133
errno = e;
134
return NULL;
135
}
136
}
137
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
142
143
do {
144
new_plugin->argv = malloc(sizeof(char *) * 2);
145
} while(new_plugin->argv == NULL and errno == EINTR);
146
if(new_plugin->argv == NULL){
147
int e = errno;
148
free(copy_name);
149
free(new_plugin);
150
errno = e;
151
return NULL;
152
}
153
new_plugin->argv[0] = copy_name;
111
154
new_plugin->argv[1] = NULL;
112
new_plugin->argc = 1;
113
new_plugin->disabled = false;
114
new_plugin->next = *plugin_list;
155
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
159
if(new_plugin->environ == NULL){
160
int e = errno;
161
free(copy_name);
162
free(new_plugin->argv);
163
free(new_plugin);
164
errno = e;
165
return NULL;
166
}
167
new_plugin->environ[0] = NULL;
168
115
169
/* Append the new plugin to the list */
116
*plugin_list = new_plugin;
170
plugin_list = new_plugin;
117
171
return new_plugin;
118
172
}
119
173
120
static void addargument(plugin *p, char *arg){
121
p->argv[p->argc] = arg;
122
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
123
if (p->argv == NULL){
124
perror("malloc");
125
exit(EXIT_FAILURE);
126
}
127
p->argc++;
128
p->argv[p->argc] = NULL;
129
}
130
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
176
static bool add_to_char_array(const char *new, char ***array,
177
int *len){
178
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
180
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
184
/* Malloc check */
185
if(new_array == NULL){
186
return false;
187
}
188
*array = new_array;
189
/* Make a copy of the new string */
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
194
if(copy == NULL){
195
return false;
196
}
197
/* Insert the copy */
198
(*array)[*len] = copy;
199
(*len)++;
200
/* Add a new terminating NULL pointer to the last element */
201
(*array)[*len] = NULL;
202
return true;
203
}
204
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
207
static bool add_argument(plugin *p, const char *arg){
208
if(p == NULL){
209
return false;
210
}
211
return add_to_char_array(arg, &(p->argv), &(p->argc));
212
}
213
214
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
216
static bool add_environment(plugin *p, const char *def, bool replace){
217
if(p == NULL){
218
return false;
219
}
220
/* namelen = length of name of environment variable */
221
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
225
/* It already exists */
226
if(replace){
227
char *new_envdef;
228
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
232
return false;
233
}
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
236
}
237
return true;
238
}
239
}
240
return add_to_char_array(def, &(p->environ), &(p->envc));
241
}
242
243
#ifndef O_CLOEXEC
131
244
/*
132
245
* Based on the example in the GNU LibC manual chapter 13.13 "File
133
246
* Descriptor Flags".
134
* *Note File Descriptor Flags:(libc)Descriptor Flags.
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
135
248
*/
136
static int set_cloexec_flag(int fd)
137
{
138
int ret = fcntl(fd, F_GETFD, 0);
249
__attribute__((warn_unused_result))
250
static int set_cloexec_flag(int fd){
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
139
252
/* If reading the flags failed, return error indication now. */
140
253
if(ret < 0){
141
254
return ret;
142
255
}
143
256
/* Store modified flag word in the descriptor. */
144
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
ret | FD_CLOEXEC));
145
259
}
146
147
const char *argp_program_version = "plugbasedclient 0.9";
148
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
149
150
process *process_list = NULL;
151
152
/* Mark a process as completed when it exits, and save its exit
260
#endif /* not O_CLOEXEC */
261
262
263
/* Mark processes as completed when they exit, and save their exit
153
264
status. */
154
void handle_sigchld(__attribute__((unused)) int sig){
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
proc->completed = true;
265
static void handle_sigchld(__attribute__((unused)) int sig){
266
int old_errno = errno;
267
while(true){
268
plugin *proc = plugin_list;
269
int status;
270
pid_t pid = waitpid(-1, &status, WNOHANG);
271
if(pid == 0){
272
/* Only still running child processes */
273
break;
274
}
275
if(pid == -1){
276
if(errno == ECHILD){
277
/* No child processes */
278
break;
279
}
280
error(0, errno, "waitpid");
281
}
282
283
/* A child exited, find it in process_list */
284
while(proc != NULL and proc->pid != pid){
285
proc = proc->next;
286
}
287
if(proc == NULL){
288
/* Process not found in process list */
289
continue;
290
}
291
proc->status = status;
292
proc->completed = 1;
293
}
294
errno = old_errno;
295
}
296
297
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
299
static bool print_out_password(const char *buffer, size_t length){
300
ssize_t ret;
301
for(size_t written = 0; written < length; written += (size_t)ret){
302
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
303
length - written));
304
if(ret < 0){
305
return false;
306
}
307
}
308
return true;
309
}
310
311
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
313
static void free_plugin(plugin *plugin_node){
314
315
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
316
free(*arg);
317
}
318
free(plugin_node->argv);
319
for(char **env = plugin_node->environ; *env != NULL; env++){
320
free(*env);
321
}
322
free(plugin_node->environ);
323
free(plugin_node->buffer);
324
325
/* Removes the plugin from the singly-linked list */
326
if(plugin_node == plugin_list){
327
/* First one - simple */
328
plugin_list = plugin_list->next;
329
} else {
330
/* Second one or later */
331
for(plugin *p = plugin_list; p != NULL; p = p->next){
332
if(p->next == plugin_node){
333
p->next = plugin_node->next;
334
break;
335
}
336
}
337
}
338
339
free(plugin_node);
340
}
341
342
static void free_plugin_list(void){
343
while(plugin_list != NULL){
344
free_plugin(plugin_list);
345
}
171
346
}
172
347
173
348
int main(int argc, char *argv[]){
174
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
175
size_t d_name_len;
176
DIR *dir = NULL;
177
struct dirent *dirst;
349
char *plugindir = NULL;
350
char *argfile = NULL;
351
FILE *conffp;
352
struct dirent **direntries;
178
353
struct stat st;
179
354
fd_set rfds_all;
180
355
int ret, maxfd = 0;
356
ssize_t sret;
181
357
uid_t uid = 65534;
182
358
gid_t gid = 65534;
183
359
bool debug = false;
185
361
struct sigaction old_sigchld_action;
186
362
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
187
363
.sa_flags = SA_NOCLDSTOP };
188
char *plus_options = NULL;
189
char **plus_argv = NULL;
364
char **custom_argv = NULL;
365
int custom_argc = 0;
366
int dir_fd = -1;
190
367
191
368
/* Establish a signal handler */
192
369
sigemptyset(&sigchld_action.sa_mask);
193
370
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
194
if(ret < 0){
195
perror("sigaddset");
196
exit(EXIT_FAILURE);
371
if(ret == -1){
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
374
goto fallback;
197
375
}
198
376
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
199
if(ret < 0){
200
perror("sigaction");
201
exit(EXIT_FAILURE);
377
if(ret == -1){
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
380
goto fallback;
202
381
}
203
382
204
383
/* The options we understand. */
206
385
{ .name = "global-options", .key = 'g',
207
386
.arg = "OPTION[,OPTION[,...]]",
208
387
.doc = "Options passed to all plugins" },
388
{ .name = "global-env", .key = 'G',
389
.arg = "VAR=value",
390
.doc = "Environment variable passed to all plugins" },
209
391
{ .name = "options-for", .key = 'o',
210
392
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
211
393
.doc = "Options passed only to specified plugin" },
394
{ .name = "env-for", .key = 'E',
395
.arg = "PLUGIN:ENV=value",
396
.doc = "Environment variable passed to specified plugin" },
212
397
{ .name = "disable", .key = 'd',
213
398
.arg = "PLUGIN",
214
399
.doc = "Disable a specific plugin", .group = 1 },
400
{ .name = "enable", .key = 'e',
401
.arg = "PLUGIN",
402
.doc = "Enable a specific plugin", .group = 1 },
215
403
{ .name = "plugin-dir", .key = 128,
216
404
.arg = "DIRECTORY",
217
405
.doc = "Specify a different plugin directory", .group = 2 },
218
{ .name = "userid", .key = 129,
219
.arg = "ID", .flags = 0,
220
.doc = "User ID the plugins will run as", .group = 2 },
221
{ .name = "groupid", .key = 130,
222
.arg = "ID", .flags = 0,
223
.doc = "Group ID the plugins will run as", .group = 2 },
224
{ .name = "debug", .key = 131,
225
.doc = "Debug mode", .group = 3 },
406
{ .name = "config-file", .key = 129,
407
.arg = "FILE",
408
.doc = "Specify a different configuration file", .group = 2 },
409
{ .name = "userid", .key = 130,
410
.arg = "ID", .flags = 0,
411
.doc = "User ID the plugins will run as", .group = 3 },
412
{ .name = "groupid", .key = 131,
413
.arg = "ID", .flags = 0,
414
.doc = "Group ID the plugins will run as", .group = 3 },
415
{ .name = "debug", .key = 132,
416
.doc = "Debug mode", .group = 4 },
417
/*
418
* These reproduce what we would get without ARGP_NO_HELP
419
*/
420
{ .name = "help", .key = '?',
421
.doc = "Give this help list", .group = -1 },
422
{ .name = "usage", .key = -3,
423
.doc = "Give a short usage message", .group = -1 },
424
{ .name = "version", .key = 'V',
425
.doc = "Print program version", .group = -1 },
226
426
{ .name = NULL }
227
427
};
228
428
229
error_t parse_opt (int key, char *arg, struct argp_state *state) {
230
/* Get the INPUT argument from `argp_parse', which we know is a
231
pointer to our plugin list pointer. */
232
plugin **plugins = state->input;
233
switch (key) {
234
case 'g':
235
if (arg != NULL){
236
char *p = strtok(arg, ",");
237
do{
238
addargument(getplugin(NULL, plugins), p);
239
p = strtok(NULL, ",");
240
} while (p != NULL);
241
}
242
break;
243
case 'o':
244
if (arg != NULL){
245
char *name = strtok(arg, ":");
246
char *p = strtok(NULL, ":");
247
if(p != NULL){
248
p = strtok(p, ",");
249
do{
250
addargument(getplugin(name, plugins), p);
251
p = strtok(NULL, ",");
252
} while (p != NULL);
253
}
254
}
255
break;
256
case 'd':
257
if (arg != NULL){
258
getplugin(arg, plugins)->disabled = true;
259
}
260
break;
261
case 128:
262
plugindir = arg;
263
break;
264
case 129:
265
uid = (uid_t)strtol(arg, NULL, 10);
266
break;
267
case 130:
268
gid = (gid_t)strtol(arg, NULL, 10);
269
break;
270
case 131:
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
431
errno = 0;
432
switch(key){
433
char *tmp;
434
intmax_t tmp_id;
435
case 'g': /* --global-options */
436
{
437
char *plugin_option;
438
while((plugin_option = strsep(&arg, ",")) != NULL){
439
if(not add_argument(getplugin(NULL), plugin_option)){
440
break;
441
}
442
}
443
errno = 0;
444
}
445
break;
446
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
449
}
450
break;
451
case 'o': /* --options-for */
452
{
453
char *option_list = strchr(arg, ':');
454
if(option_list == NULL){
455
argp_error(state, "No colon in \"%s\"", arg);
456
errno = EINVAL;
457
break;
458
}
459
*option_list = '\0';
460
option_list++;
461
if(arg[0] == '\0'){
462
argp_error(state, "Empty plugin name");
463
errno = EINVAL;
464
break;
465
}
466
char *option;
467
while((option = strsep(&option_list, ",")) != NULL){
468
if(not add_argument(getplugin(arg), option)){
469
break;
470
}
471
}
472
errno = 0;
473
}
474
break;
475
case 'E': /* --env-for */
476
{
477
char *envdef = strchr(arg, ':');
478
if(envdef == NULL){
479
argp_error(state, "No colon in \"%s\"", arg);
480
errno = EINVAL;
481
break;
482
}
483
*envdef = '\0';
484
envdef++;
485
if(arg[0] == '\0'){
486
argp_error(state, "Empty plugin name");
487
errno = EINVAL;
488
break;
489
}
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
492
}
493
}
494
break;
495
case 'd': /* --disable */
496
{
497
plugin *p = getplugin(arg);
498
if(p != NULL){
499
p->disabled = true;
500
errno = 0;
501
}
502
}
503
break;
504
case 'e': /* --enable */
505
{
506
plugin *p = getplugin(arg);
507
if(p != NULL){
508
p->disabled = false;
509
errno = 0;
510
}
511
}
512
break;
513
case 128: /* --plugin-dir */
514
free(plugindir);
515
plugindir = strdup(arg);
516
if(plugindir != NULL){
517
errno = 0;
518
}
519
break;
520
case 129: /* --config-file */
521
/* This is already done by parse_opt_config_file() */
522
break;
523
case 130: /* --userid */
524
tmp_id = strtoimax(arg, &tmp, 10);
525
if(errno != 0 or tmp == arg or *tmp != '\0'
526
or tmp_id != (uid_t)tmp_id){
527
argp_error(state, "Bad user ID number: \"%s\", using %"
528
PRIdMAX, arg, (intmax_t)uid);
529
break;
530
}
531
uid = (uid_t)tmp_id;
532
errno = 0;
533
break;
534
case 131: /* --groupid */
535
tmp_id = strtoimax(arg, &tmp, 10);
536
if(errno != 0 or tmp == arg or *tmp != '\0'
537
or tmp_id != (gid_t)tmp_id){
538
argp_error(state, "Bad group ID number: \"%s\", using %"
539
PRIdMAX, arg, (intmax_t)gid);
540
break;
541
}
542
gid = (gid_t)tmp_id;
543
errno = 0;
544
break;
545
case 132: /* --debug */
271
546
debug = true;
272
547
break;
273
case ARGP_KEY_ARG:
274
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
275
argp_usage (state);
276
}
277
plus_options = arg;
278
break;
279
case ARGP_KEY_END:
280
break;
281
default:
282
return ARGP_ERR_UNKNOWN;
283
}
284
return 0;
285
}
286
287
plugin *plugin_list = NULL;
288
289
struct argp argp = { .options = options, .parser = parse_opt,
290
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
548
/*
549
* These reproduce what we would get without ARGP_NO_HELP
550
*/
551
case '?': /* --help */
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
554
case -3: /* --usage */
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
556
argp_state_help(state, state->out_stream,
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
558
case 'V': /* --version */
559
fprintf(state->out_stream, "%s\n", argp_program_version);
560
exit(EXIT_SUCCESS);
561
break;
562
/*
563
* When adding more options before this line, remember to also add a
564
* "case" to the "parse_opt_config_file" function below.
565
*/
566
case ARGP_KEY_ARG:
567
/* Cryptsetup always passes an argument, which is an empty
568
string if "none" was specified in /etc/crypttab. So if
569
argument was empty, we ignore it silently. */
570
if(arg[0] == '\0'){
571
break;
572
}
573
default:
574
return ARGP_ERR_UNKNOWN;
575
}
576
return errno; /* Set to 0 at start */
577
}
578
579
/* This option parser is the same as parse_opt() above, except it
580
ignores everything but the --config-file option. */
581
error_t parse_opt_config_file(int key, char *arg,
582
__attribute__((unused))
583
struct argp_state *state){
584
errno = 0;
585
switch(key){
586
case 'g': /* --global-options */
587
case 'G': /* --global-env */
588
case 'o': /* --options-for */
589
case 'E': /* --env-for */
590
case 'd': /* --disable */
591
case 'e': /* --enable */
592
case 128: /* --plugin-dir */
593
break;
594
case 129: /* --config-file */
595
free(argfile);
596
argfile = strdup(arg);
597
if(argfile != NULL){
598
errno = 0;
599
}
600
break;
601
case 130: /* --userid */
602
case 131: /* --groupid */
603
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
607
case ARGP_KEY_ARG:
608
break;
609
default:
610
return ARGP_ERR_UNKNOWN;
611
}
612
return errno;
613
}
614
615
struct argp argp = { .options = options,
616
.parser = parse_opt_config_file,
617
.args_doc = "",
291
618
.doc = "Mandos plugin runner -- Run plugins" };
292
619
293
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
294
if (ret == ARGP_ERR_UNKNOWN){
295
fprintf(stderr, "Unkown error while parsing arguments\n");
296
exitstatus = EXIT_FAILURE;
297
goto end;
298
}
299
300
if(plus_options){
301
/* This is a mangled argument in the form of
302
"+--option+--other-option=parameter+--yet-another-option", etc */
303
/* Make new argc and argv vars, and call argp_parse() again. */
304
plus_options++; /* skip the first '+' character */
305
const char delims[] = "+";
306
char *arg;
307
int new_argc = 1;
308
plus_argv = malloc(sizeof(char*) * 2);
309
if(plus_argv == NULL){
310
perror("malloc");
311
exitstatus = EXIT_FAILURE;
312
goto end;
313
}
314
plus_argv[0] = argv[0];
315
plus_argv[1] = NULL;
316
arg = strtok(plus_options, delims); /* Get first argument */
317
while(arg != NULL){
318
new_argc++;
319
plus_argv = realloc(plus_argv, sizeof(char *)
320
* ((unsigned int) new_argc + 1));
321
if(plus_argv == NULL){
322
perror("realloc");
323
exitstatus = EXIT_FAILURE;
324
goto end;
325
}
326
plus_argv[new_argc-1] = arg;
327
plus_argv[new_argc] = NULL;
328
arg = strtok(NULL, delims); /* Get next argument */
329
}
330
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
331
if (ret == ARGP_ERR_UNKNOWN){
332
fprintf(stderr, "Unkown error while parsing arguments\n");
333
exitstatus = EXIT_FAILURE;
334
goto end;
335
}
620
/* Parse using parse_opt_config_file() in order to get the custom
621
config file location, if any. */
622
ret = argp_parse(&argp, argc, argv,
623
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
624
NULL, NULL);
625
switch(ret){
626
case 0:
627
break;
628
case ENOMEM:
629
default:
630
errno = ret;
631
error(0, errno, "argp_parse");
632
exitstatus = EX_OSERR;
633
goto fallback;
634
case EINVAL:
635
exitstatus = EX_USAGE;
636
goto fallback;
637
}
638
639
/* Reset to the normal argument parser */
640
argp.parser = parse_opt;
641
642
/* Open the configfile if available */
643
if(argfile == NULL){
644
conffp = fopen(AFILE, "r");
645
} else {
646
conffp = fopen(argfile, "r");
647
}
648
if(conffp != NULL){
649
char *org_line = NULL;
650
char *p, *arg, *new_arg, *line;
651
size_t size = 0;
652
const char whitespace_delims[] = " \r\t\f\v\n";
653
const char comment_delim[] = "#";
654
655
custom_argc = 1;
656
custom_argv = malloc(sizeof(char*) * 2);
657
if(custom_argv == NULL){
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
660
goto fallback;
661
}
662
custom_argv[0] = argv[0];
663
custom_argv[1] = NULL;
664
665
/* for each line in the config file, strip whitespace and ignore
666
commented text */
667
while(true){
668
sret = getline(&org_line, &size, conffp);
669
if(sret == -1){
670
break;
671
}
672
673
line = org_line;
674
arg = strsep(&line, comment_delim);
675
while((p = strsep(&arg, whitespace_delims)) != NULL){
676
if(p[0] == '\0'){
677
continue;
678
}
679
new_arg = strdup(p);
680
if(new_arg == NULL){
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
683
free(org_line);
684
goto fallback;
685
}
686
687
custom_argc += 1;
688
{
689
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
695
free(new_arg);
696
free(org_line);
697
goto fallback;
698
} else {
699
custom_argv = new_argv;
700
}
701
}
702
custom_argv[custom_argc-1] = new_arg;
703
custom_argv[custom_argc] = NULL;
704
}
705
}
706
do {
707
ret = fclose(conffp);
708
} while(ret == EOF and errno == EINTR);
709
if(ret == EOF){
710
error(0, errno, "fclose");
711
exitstatus = EX_IOERR;
712
goto fallback;
713
}
714
free(org_line);
715
} else {
716
/* Check for harmful errors and go to fallback. Other errors might
717
not affect opening plugins */
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
721
goto fallback;
722
}
723
}
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
726
if(custom_argv != NULL){
727
ret = argp_parse(&argp, custom_argc, custom_argv,
728
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
729
NULL, NULL);
730
switch(ret){
731
case 0:
732
break;
733
case ENOMEM:
734
default:
735
errno = ret;
736
error(0, errno, "argp_parse");
737
exitstatus = EX_OSERR;
738
goto fallback;
739
case EINVAL:
740
exitstatus = EX_CONFIG;
741
goto fallback;
742
}
743
}
744
745
/* Parse actual command line arguments, to let them override the
746
config file */
747
ret = argp_parse(&argp, argc, argv,
748
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
749
NULL, NULL);
750
switch(ret){
751
case 0:
752
break;
753
case ENOMEM:
754
default:
755
errno = ret;
756
error(0, errno, "argp_parse");
757
exitstatus = EX_OSERR;
758
goto fallback;
759
case EINVAL:
760
exitstatus = EX_USAGE;
761
goto fallback;
336
762
}
337
763
338
764
if(debug){
342
768
for(char **a = p->argv; *a != NULL; a++){
343
769
fprintf(stderr, "\tArg: %s\n", *a);
344
770
}
345
}
346
}
347
771
fprintf(stderr, "...and %d environment variables\n", p->envc);
772
for(char **a = p->environ; *a != NULL; a++){
773
fprintf(stderr, "\t%s\n", *a);
774
}
775
}
776
}
777
778
if(getuid() == 0){
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
786
} else {
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
788
if(ret == -1){
789
error(0, errno, "fstat");
790
} else {
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
793
if(ret == -1){
794
error(0, errno, "fchown");
795
}
796
}
797
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
799
}
800
}
801
802
/* Lower permissions */
803
ret = setgid(gid);
804
if(ret == -1){
805
error(0, errno, "setgid");
806
}
348
807
ret = setuid(uid);
349
if (ret == -1){
350
perror("setuid");
351
}
352
353
setgid(gid);
354
if (ret == -1){
355
perror("setgid");
356
}
357
358
dir = opendir(plugindir);
359
if(dir == NULL){
360
perror("Could not open plugin dir");
361
exitstatus = EXIT_FAILURE;
362
goto end;
363
}
364
365
/* Set the FD_CLOEXEC flag on the directory, if possible */
808
if(ret == -1){
809
error(0, errno, "setuid");
810
}
811
812
/* Open plugin directory with close_on_exec flag */
366
813
{
367
int dir_fd = dirfd(dir);
368
if(dir_fd >= 0){
369
ret = set_cloexec_flag(dir_fd);
370
if(ret < 0){
371
perror("set_cloexec_flag");
372
exitstatus = EXIT_FAILURE;
373
goto end;
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
815
#ifdef O_CLOEXEC
816
O_CLOEXEC
817
#else /* not O_CLOEXEC */
818
0
819
#endif /* not O_CLOEXEC */
820
);
821
if(dir_fd == -1){
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
824
goto fallback;
825
}
826
827
#ifndef O_CLOEXEC
828
/* Set the FD_CLOEXEC flag on the directory */
829
ret = set_cloexec_flag(dir_fd);
830
if(ret < 0){
831
error(0, errno, "set_cloexec_flag");
832
TEMP_FAILURE_RETRY(close(dir_fd));
833
exitstatus = EX_OSERR;
834
goto fallback;
835
}
836
#endif /* O_CLOEXEC */
837
}
838
839
int good_name(const struct dirent * const dirent){
840
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
841
"*.dpkg-old", "*.dpkg-bak",
842
"*.dpkg-divert", NULL };
843
#ifdef __GNUC__
844
#pragma GCC diagnostic push
845
#pragma GCC diagnostic ignored "-Wcast-qual"
846
#endif
847
for(const char **pat = (const char **)patterns;
848
*pat != NULL; pat++){
849
#ifdef __GNUC__
850
#pragma GCC diagnostic pop
851
#endif
852
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
853
!= FNM_NOMATCH){
854
if(debug){
855
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
856
" matching pattern %s\n", dirent->d_name, *pat);
857
}
858
return 0;
374
859
}
375
860
}
861
return 1;
862
}
863
864
#ifdef __GLIBC__
865
#if __GLIBC_PREREQ(2, 15)
866
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
867
alphasort);
868
#else /* not __GLIBC_PREREQ(2, 15) */
869
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
870
&direntries, good_name, alphasort);
871
#endif /* not __GLIBC_PREREQ(2, 15) */
872
#else /* not __GLIBC__ */
873
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
874
&direntries, good_name, alphasort);
875
#endif /* not __GLIBC__ */
876
if(numplugins == -1){
877
error(0, errno, "Could not scan plugin dir");
878
TEMP_FAILURE_RETRY(close(dir_fd));
879
exitstatus = EX_OSERR;
880
goto fallback;
376
881
}
377
882
378
883
FD_ZERO(&rfds_all);
379
884
380
while(true){
381
dirst = readdir(dir);
382
383
// All directory entries have been processed
384
if(dirst == NULL){
385
if (errno == EBADF){
386
perror("readdir");
387
exitstatus = EXIT_FAILURE;
388
goto end;
389
}
390
break;
391
}
392
393
d_name_len = strlen(dirst->d_name);
394
395
// Ignore dotfiles, backup files and other junk
396
{
397
bool bad_name = false;
398
399
const char const *bad_prefixes[] = { ".", "#", NULL };
400
401
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
402
".dpkg-old",
403
".dpkg-divert", NULL };
404
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
405
size_t pre_len = strlen(*pre);
406
if((d_name_len >= pre_len)
407
and strncmp((dirst->d_name), *pre, pre_len) == 0){
408
if(debug){
409
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
410
" with bad prefix %s\n", dirst->d_name, *pre);
411
}
412
bad_name = true;
413
break;
414
}
415
}
416
417
if(bad_name){
418
continue;
419
}
420
421
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
422
size_t suf_len = strlen(*suf);
423
if((d_name_len >= suf_len)
424
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
425
== 0)){
426
if(debug){
427
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
428
" with bad suffix %s\n", dirst->d_name, *suf);
429
}
430
bad_name = true;
431
break;
432
}
433
}
434
435
if(bad_name){
436
continue;
437
}
438
}
439
440
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
441
if (filename == NULL){
442
perror("malloc");
443
exitstatus = EXIT_FAILURE;
444
goto end;
445
}
446
strcpy(filename, plugindir); /* Spurious warning */
447
strcat(filename, "/"); /* Spurious warning */
448
strcat(filename, dirst->d_name); /* Spurious warning */
449
450
ret = stat(filename, &st);
451
if (ret == -1){
452
perror("stat");
453
exitstatus = EXIT_FAILURE;
454
goto end;
455
}
456
457
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
885
/* Read and execute any executable in the plugin directory*/
886
for(int i = 0; i < numplugins; i++){
887
888
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
889
if(plugin_fd == -1){
890
error(0, errno, "Could not open plugin");
891
continue;
892
}
893
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
894
if(ret == -1){
895
error(0, errno, "stat");
896
TEMP_FAILURE_RETRY(close(plugin_fd));
897
continue;
898
}
899
900
/* Ignore non-executable files */
901
if(not S_ISREG(st.st_mode)
902
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
903
X_OK, 0)) != 0)){
458
904
if(debug){
459
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
460
" with bad type or mode\n", filename);
905
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
906
" with bad type or mode\n",
907
plugindir != NULL ? plugindir : PDIR,
908
direntries[i]->d_name);
461
909
}
462
free(filename);
463
continue;
464
}
465
if(getplugin(dirst->d_name, &plugin_list)->disabled){
910
TEMP_FAILURE_RETRY(close(plugin_fd));
911
continue;
912
}
913
914
plugin *p = getplugin(direntries[i]->d_name);
915
if(p == NULL){
916
error(0, errno, "getplugin");
917
TEMP_FAILURE_RETRY(close(plugin_fd));
918
continue;
919
}
920
if(p->disabled){
466
921
if(debug){
467
922
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
468
dirst->d_name);
923
direntries[i]->d_name);
469
924
}
470
free(filename);
925
TEMP_FAILURE_RETRY(close(plugin_fd));
471
926
continue;
472
927
}
473
plugin *p = getplugin(dirst->d_name, &plugin_list);
474
928
{
475
929
/* Add global arguments to argument list for this plugin */
476
plugin *g = getplugin(NULL, &plugin_list);
477
for(char **a = g->argv + 1; *a != NULL; a++){
478
addargument(p, *a);
479
}
480
}
481
int pipefd[2];
482
ret = pipe(pipefd);
483
if (ret == -1){
484
perror("pipe");
485
exitstatus = EXIT_FAILURE;
486
goto end;
487
}
930
plugin *g = getplugin(NULL);
931
if(g != NULL){
932
for(char **a = g->argv + 1; *a != NULL; a++){
933
if(not add_argument(p, *a)){
934
error(0, errno, "add_argument");
935
}
936
}
937
/* Add global environment variables */
938
for(char **e = g->environ; *e != NULL; e++){
939
if(not add_environment(p, *e, false)){
940
error(0, errno, "add_environment");
941
}
942
}
943
}
944
}
945
/* If this plugin has any environment variables, we need to
946
duplicate the environment from this process, too. */
947
if(p->environ[0] != NULL){
948
for(char **e = environ; *e != NULL; e++){
949
if(not add_environment(p, *e, false)){
950
error(0, errno, "add_environment");
951
}
952
}
953
}
954
955
int pipefd[2];
956
#ifndef O_CLOEXEC
957
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
958
#else /* O_CLOEXEC */
959
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
960
#endif /* O_CLOEXEC */
961
if(ret == -1){
962
error(0, errno, "pipe");
963
exitstatus = EX_OSERR;
964
goto fallback;
965
}
966
if(pipefd[0] >= FD_SETSIZE){
967
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
968
FD_SETSIZE);
969
TEMP_FAILURE_RETRY(close(pipefd[0]));
970
TEMP_FAILURE_RETRY(close(pipefd[1]));
971
exitstatus = EX_OSERR;
972
goto fallback;
973
}
974
#ifndef O_CLOEXEC
975
/* Ask OS to automatic close the pipe on exec */
488
976
ret = set_cloexec_flag(pipefd[0]);
489
977
if(ret < 0){
490
perror("set_cloexec_flag");
491
exitstatus = EXIT_FAILURE;
492
goto end;
978
error(0, errno, "set_cloexec_flag");
979
TEMP_FAILURE_RETRY(close(pipefd[0]));
980
TEMP_FAILURE_RETRY(close(pipefd[1]));
981
exitstatus = EX_OSERR;
982
goto fallback;
493
983
}
494
984
ret = set_cloexec_flag(pipefd[1]);
495
985
if(ret < 0){
496
perror("set_cloexec_flag");
497
exitstatus = EXIT_FAILURE;
498
goto end;
986
error(0, errno, "set_cloexec_flag");
987
TEMP_FAILURE_RETRY(close(pipefd[0]));
988
TEMP_FAILURE_RETRY(close(pipefd[1]));
989
exitstatus = EX_OSERR;
990
goto fallback;
499
991
}
992
#endif /* not O_CLOEXEC */
500
993
/* Block SIGCHLD until process is safely in process list */
501
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
994
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
995
&sigchld_action.sa_mask,
996
NULL));
502
997
if(ret < 0){
503
perror("sigprocmask");
504
exitstatus = EXIT_FAILURE;
505
goto end;
506
}
507
// Starting a new process to be watched
508
pid_t pid = fork();
998
error(0, errno, "sigprocmask");
999
exitstatus = EX_OSERR;
1000
goto fallback;
1001
}
1002
/* Starting a new process to be watched */
1003
pid_t pid;
1004
do {
1005
pid = fork();
1006
} while(pid == -1 and errno == EINTR);
1007
if(pid == -1){
1008
error(0, errno, "fork");
1009
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1010
&sigchld_action.sa_mask, NULL));
1011
TEMP_FAILURE_RETRY(close(pipefd[0]));
1012
TEMP_FAILURE_RETRY(close(pipefd[1]));
1013
exitstatus = EX_OSERR;
1014
goto fallback;
1015
}
509
1016
if(pid == 0){
510
1017
/* this is the child process */
511
1018
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
512
1019
if(ret < 0){
513
perror("sigaction");
514
_exit(EXIT_FAILURE);
1020
error(0, errno, "sigaction");
1021
_exit(EX_OSERR);
515
1022
}
516
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1023
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
517
1024
if(ret < 0){
518
perror("sigprocmask");
519
_exit(EXIT_FAILURE);
1025
error(0, errno, "sigprocmask");
1026
_exit(EX_OSERR);
520
1027
}
521
1028
522
1029
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
523
1030
if(ret == -1){
524
perror("dup2");
525
_exit(EXIT_FAILURE);
1031
error(0, errno, "dup2");
1032
_exit(EX_OSERR);
526
1033
}
527
1034
528
if(dirfd(dir) < 0){
529
/* If dir has no file descriptor, we could not set FD_CLOEXEC
530
above and must now close it manually here. */
531
closedir(dir);
532
}
533
if(execv(filename, p->argv) < 0){
534
perror("execv");
535
_exit(EXIT_FAILURE);
1035
if(fexecve(plugin_fd, p->argv,
1036
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1037
error(0, errno, "fexecve for %s/%s",
1038
plugindir != NULL ? plugindir : PDIR,
1039
direntries[i]->d_name);
1040
_exit(EX_OSERR);
536
1041
}
537
1042
/* no return */
538
1043
}
539
/* parent process */
540
free(filename);
541
close(pipefd[1]); /* close unused write end of pipe */
542
process *new_process = malloc(sizeof(process));
543
if (new_process == NULL){
544
perror("malloc");
545
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1044
/* Parent process */
1045
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1046
pipe */
1047
TEMP_FAILURE_RETRY(close(plugin_fd));
1048
plugin *new_plugin = getplugin(direntries[i]->d_name);
1049
if(new_plugin == NULL){
1050
error(0, errno, "getplugin");
1051
ret = (int)(TEMP_FAILURE_RETRY
1052
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1053
NULL)));
546
1054
if(ret < 0){
547
perror("sigprocmask");
1055
error(0, errno, "sigprocmask");
548
1056
}
549
exitstatus = EXIT_FAILURE;
550
goto end;
1057
exitstatus = EX_OSERR;
1058
goto fallback;
551
1059
}
552
1060
553
*new_process = (struct process){ .pid = pid,
554
.fd = pipefd[0],
555
.next = process_list };
556
// List handling
557
process_list = new_process;
1061
new_plugin->pid = pid;
1062
new_plugin->fd = pipefd[0];
1063
558
1064
/* Unblock SIGCHLD so signal handler can be run if this process
559
1065
has already completed */
560
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1066
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1067
&sigchld_action.sa_mask,
1068
NULL));
561
1069
if(ret < 0){
562
perror("sigprocmask");
563
exitstatus = EXIT_FAILURE;
564
goto end;
565
}
566
567
FD_SET(new_process->fd, &rfds_all);
568
569
if (maxfd < new_process->fd){
570
maxfd = new_process->fd;
571
}
572
573
}
574
575
/* Free the plugin list */
576
for(plugin *next; plugin_list != NULL; plugin_list = next){
577
next = plugin_list->next;
578
free(plugin_list->argv);
579
free(plugin_list);
580
}
581
582
closedir(dir);
583
dir = NULL;
584
585
if (process_list == NULL){
586
fprintf(stderr, "No plugin processes started, exiting\n");
587
exitstatus = EXIT_FAILURE;
588
goto end;
589
}
590
while(process_list){
1070
error(0, errno, "sigprocmask");
1071
exitstatus = EX_OSERR;
1072
goto fallback;
1073
}
1074
1075
#if defined (__GNUC__) and defined (__GLIBC__)
1076
#if not __GLIBC_PREREQ(2, 16)
1077
#pragma GCC diagnostic push
1078
#pragma GCC diagnostic ignored "-Wsign-conversion"
1079
#endif
1080
#endif
1081
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1082
-Wconversion in GNU libc
1083
before 2.16 */
1084
#if defined (__GNUC__) and defined (__GLIBC__)
1085
#if not __GLIBC_PREREQ(2, 16)
1086
#pragma GCC diagnostic pop
1087
#endif
1088
#endif
1089
1090
if(maxfd < new_plugin->fd){
1091
maxfd = new_plugin->fd;
1092
}
1093
}
1094
1095
TEMP_FAILURE_RETRY(close(dir_fd));
1096
free_plugin(getplugin(NULL));
1097
1098
for(plugin *p = plugin_list; p != NULL; p = p->next){
1099
if(p->pid != 0){
1100
break;
1101
}
1102
if(p->next == NULL){
1103
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1104
" directory?\n");
1105
free_plugin_list();
1106
}
1107
}
1108
1109
/* Main loop while running plugins exist */
1110
while(plugin_list){
591
1111
fd_set rfds = rfds_all;
592
1112
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
593
if (select_ret == -1){
594
perror("select");
595
exitstatus = EXIT_FAILURE;
596
goto end;
1113
if(select_ret == -1 and errno != EINTR){
1114
error(0, errno, "select");
1115
exitstatus = EX_OSERR;
1116
goto fallback;
597
1117
}
598
1118
/* OK, now either a process completed, or something can be read
599
1119
from one of them */
600
for(process *proc = process_list; proc ; proc = proc->next){
1120
for(plugin *proc = plugin_list; proc != NULL;){
601
1121
/* Is this process completely done? */
602
if(proc->eof and proc->completed){
1122
if(proc->completed and proc->eof){
603
1123
/* Only accept the plugin output if it exited cleanly */
604
1124
if(not WIFEXITED(proc->status)
605
1125
or WEXITSTATUS(proc->status) != 0){
606
1126
/* Bad exit by plugin */
1127
607
1128
if(debug){
608
1129
if(WIFEXITED(proc->status)){
609
fprintf(stderr, "Plugin %d exited with status %d\n",
610
proc->pid, WEXITSTATUS(proc->status));
611
} else if(WIFSIGNALED(proc->status)) {
612
fprintf(stderr, "Plugin %d killed by signal %d\n",
613
proc->pid, WTERMSIG(proc->status));
1130
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1131
" status %d\n", proc->name,
1132
(intmax_t) (proc->pid),
1133
WEXITSTATUS(proc->status));
1134
} else if(WIFSIGNALED(proc->status)){
1135
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1136
" signal %d: %s\n", proc->name,
1137
(intmax_t) (proc->pid),
1138
WTERMSIG(proc->status),
1139
strsignal(WTERMSIG(proc->status)));
614
1140
} else if(WCOREDUMP(proc->status)){
615
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
1141
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1142
" core\n", proc->name, (intmax_t) (proc->pid));
616
1143
}
617
1144
}
1145
618
1146
/* Remove the plugin */
619
FD_CLR(proc->fd, &rfds_all);
1147
#if defined (__GNUC__) and defined (__GLIBC__)
1148
#if not __GLIBC_PREREQ(2, 16)
1149
#pragma GCC diagnostic push
1150
#pragma GCC diagnostic ignored "-Wsign-conversion"
1151
#endif
1152
#endif
1153
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1154
-Wconversion in GNU libc
1155
before 2.16 */
1156
#if defined (__GNUC__) and defined (__GLIBC__)
1157
#if not __GLIBC_PREREQ(2, 16)
1158
#pragma GCC diagnostic pop
1159
#endif
1160
#endif
1161
620
1162
/* Block signal while modifying process_list */
621
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1163
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1164
(SIG_BLOCK,
1165
&sigchld_action.sa_mask,
1166
NULL));
622
1167
if(ret < 0){
623
perror("sigprocmask");
624
exitstatus = EXIT_FAILURE;
625
goto end;
626
}
627
/* Delete this process entry from the list */
628
if(process_list == proc){
629
/* First one - simple */
630
process_list = proc->next;
631
} else {
632
/* Second one or later */
633
for(process *p = process_list; p != NULL; p = p->next){
634
if(p->next == proc){
635
p->next = proc->next;
636
break;
637
}
638
}
639
}
1168
error(0, errno, "sigprocmask");
1169
exitstatus = EX_OSERR;
1170
goto fallback;
1171
}
1172
1173
plugin *next_plugin = proc->next;
1174
free_plugin(proc);
1175
proc = next_plugin;
1176
640
1177
/* We are done modifying process list, so unblock signal */
641
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
642
NULL);
1178
ret = (int)(TEMP_FAILURE_RETRY
1179
(sigprocmask(SIG_UNBLOCK,
1180
&sigchld_action.sa_mask, NULL)));
643
1181
if(ret < 0){
644
perror("sigprocmask");
645
}
646
free(proc->buffer);
647
free(proc);
648
/* We deleted this process from the list, so we can't go
649
proc->next. Therefore, start over from the beginning of
650
the process list */
651
break;
1182
error(0, errno, "sigprocmask");
1183
exitstatus = EX_OSERR;
1184
goto fallback;
1185
}
1186
1187
if(plugin_list == NULL){
1188
break;
1189
}
1190
1191
continue;
652
1192
}
1193
653
1194
/* This process exited nicely, so print its buffer */
654
for(size_t written = 0; written < proc->buffer_length;
655
written += (size_t)ret){
656
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
657
proc->buffer + written,
658
proc->buffer_length
659
- written));
660
if(ret < 0){
661
perror("write");
662
exitstatus = EXIT_FAILURE;
663
goto end;
664
}
1195
1196
bool bret = print_out_password(proc->buffer,
1197
proc->buffer_length);
1198
if(not bret){
1199
error(0, errno, "print_out_password");
1200
exitstatus = EX_IOERR;
665
1201
}
666
goto end;
1202
goto fallback;
667
1203
}
1204
668
1205
/* This process has not completed. Does it have any output? */
669
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1206
#if defined (__GNUC__) and defined (__GLIBC__)
1207
#if not __GLIBC_PREREQ(2, 16)
1208
#pragma GCC diagnostic push
1209
#pragma GCC diagnostic ignored "-Wsign-conversion"
1210
#endif
1211
#endif
1212
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1213
warning from
1214
-Wconversion
1215
in GNU libc
1216
before
1217
2.16 */
1218
#if defined (__GNUC__) and defined (__GLIBC__)
1219
#if not __GLIBC_PREREQ(2, 16)
1220
#pragma GCC diagnostic pop
1221
#endif
1222
#endif
670
1223
/* This process had nothing to say at this time */
1224
proc = proc->next;
671
1225
continue;
672
1226
}
673
1227
/* Before reading, make the process' data buffer large enough */
674
1228
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
675
proc->buffer = realloc(proc->buffer, proc->buffer_size
676
+ (size_t) BUFFER_SIZE);
677
if (proc->buffer == NULL){
678
perror("malloc");
679
exitstatus = EXIT_FAILURE;
680
goto end;
1229
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1230
+ (size_t) BUFFER_SIZE);
1231
if(new_buffer == NULL){
1232
error(0, errno, "malloc");
1233
exitstatus = EX_OSERR;
1234
goto fallback;
681
1235
}
1236
proc->buffer = new_buffer;
682
1237
proc->buffer_size += BUFFER_SIZE;
683
1238
}
684
1239
/* Read from the process */
685
ret = read(proc->fd, proc->buffer + proc->buffer_length,
686
BUFFER_SIZE);
687
if(ret < 0){
1240
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1241
proc->buffer
1242
+ proc->buffer_length,
1243
BUFFER_SIZE));
1244
if(sret < 0){
688
1245
/* Read error from this process; ignore the error */
1246
proc = proc->next;
689
1247
continue;
690
1248
}
691
if(ret == 0){
1249
if(sret == 0){
692
1250
/* got EOF */
693
1251
proc->eof = true;
694
1252
} else {
695
proc->buffer_length += (size_t) ret;
1253
proc->buffer_length += (size_t) sret;
696
1254
}
697
1255
}
698
1256
}
699
if(process_list == NULL){
700
fprintf(stderr, "All plugin processes failed, exiting\n");
701
exitstatus = EXIT_FAILURE;
1257
1258
1259
fallback:
1260
1261
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1262
and exitstatus != EX_OK)){
1263
/* Fallback if all plugins failed, none are found or an error
1264
occured */
1265
bool bret;
1266
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1267
char *passwordbuffer = getpass("Password: ");
1268
size_t len = strlen(passwordbuffer);
1269
/* Strip trailing newline */
1270
if(len > 0 and passwordbuffer[len-1] == '\n'){
1271
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1272
len--;
1273
}
1274
bret = print_out_password(passwordbuffer, len);
1275
if(not bret){
1276
error(0, errno, "print_out_password");
1277
exitstatus = EX_IOERR;
1278
}
702
1279
}
703
1280
704
end:
705
1281
/* Restore old signal handler */
706
sigaction(SIGCHLD, &old_sigchld_action, NULL);
707
708
free(plus_argv);
709
710
/* Free the plugin list */
711
for(plugin *next; plugin_list != NULL; plugin_list = next){
712
next = plugin_list->next;
713
free(plugin_list->argv);
714
free(plugin_list);
715
}
716
717
if(dir != NULL){
718
closedir(dir);
719
}
720
721
/* Free the process list and kill the processes */
722
for(process *next; process_list != NULL; process_list = next){
723
next = process_list->next;
724
close(process_list->fd);
725
ret = kill(process_list->pid, SIGTERM);
726
if(ret == -1 and errno != ESRCH){
727
/* set-uid proccesses migth not get closed */
728
perror("kill");
729
}
730
free(process_list->buffer);
731
free(process_list);
1282
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1283
if(ret == -1){
1284
error(0, errno, "sigaction");
1285
exitstatus = EX_OSERR;
1286
}
1287
1288
if(custom_argv != NULL){
1289
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1290
free(*arg);
1291
}
1292
free(custom_argv);
1293
}
1294
1295
if(dir_fd != -1){
1296
TEMP_FAILURE_RETRY(close(dir_fd));
1297
}
1298
1299
/* Kill the processes */
1300
for(plugin *p = plugin_list; p != NULL; p = p->next){
1301
if(p->pid != 0){
1302
close(p->fd);
1303
ret = kill(p->pid, SIGTERM);
1304
if(ret == -1 and errno != ESRCH){
1305
/* Set-uid proccesses might not get closed */
1306
error(0, errno, "kill");
1307
}
1308
}
732
1309
}
733
1310
734
1311
/* Wait for any remaining child processes to terminate */
735
do{
1312
do {
736
1313
ret = wait(NULL);
737
1314
} while(ret >= 0);
738
1315
if(errno != ECHILD){
739
perror("wait");
1316
error(0, errno, "wait");
740
1317
}
741
1318
1319
free_plugin_list();
1320
1321
free(plugindir);
1322
free(argfile);
1323
742
1324
return exitstatus;
743
1325
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0