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- Committer: teddy at recompile
- Date: 2020-02-09 17:57:08 UTC
- Revision ID: teddy@recompile.se-20200209175708-bmprnuxqmr2lkhfh
initramfs-tools-hook: Properly quote argument to test -n
* initramfs-tools-hook: Quote output from subshell so that test -n
always get exactly one argument, never more than one.
* initramfs-tools-hook: Quote output from subshell so that test -n
always get exactly one argument, never more than one.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- 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
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
13
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
14
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
18
* General Public License for more details.
16
19
*
17
20
* You should have received a copy of the GNU General Public License
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
20
22
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
22
24
*/
23
25
24
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
27
O_CLOEXEC, pipe2() */
26
28
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdlib.h> /* malloc(), reallocarray(), realloc(),
30
EXIT_SUCCESS, exit() */
29
31
#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() */
32
#include <stdio.h> /* fileno(), fprintf(),
33
stderr, STDOUT_FILENO, fclose() */
34
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
35
WIFEXITED(), WEXITSTATUS(), wait(),
36
pid_t, uid_t, gid_t, getuid(),
37
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
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG() */
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> /* strsep, strlen(), asprintf() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
57
#include <errno.h> /* errno */
56
58
#include <argp.h> /* struct argp_option, struct
57
59
argp_state, struct argp,
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
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
73
struct process;
74
75
typedef struct process{
76
pid_t pid;
77
int fd;
78
char *buffer;
79
size_t buffer_size;
80
size_t buffer_length;
81
bool eof;
82
volatile bool completed;
83
volatile int status;
84
struct process *next;
85
} process;
77
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
86
84
87
85
typedef struct plugin{
88
86
char *name; /* can be NULL or any plugin name */
91
89
char **environ;
92
90
int envc;
93
91
bool disabled;
92
93
/* Variables used for running processes*/
94
pid_t pid;
95
int fd;
96
char *buffer;
97
size_t buffer_size;
98
size_t buffer_length;
99
bool eof;
100
volatile sig_atomic_t completed;
101
int status;
94
102
struct plugin *next;
95
103
} plugin;
96
104
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
99
if ((p->name == name)
100
or (p->name and name and (strcmp(p->name, name) == 0))){
105
static plugin *plugin_list = NULL;
106
107
/* Gets an existing plugin based on name,
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
static plugin *getplugin(char *name){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
if((p->name == name)
114
or (p->name and name and (strcmp(p->name, name) == 0))){
101
115
return p;
102
116
}
103
117
}
104
118
/* Create a new plugin */
105
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
107
124
return NULL;
108
125
}
109
126
char *copy_name = NULL;
110
127
if(name != NULL){
111
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
112
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
113
135
return NULL;
114
136
}
115
137
}
116
138
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
122
143
123
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
148
int e = errno;
125
149
free(copy_name);
126
150
free(new_plugin);
151
errno = e;
127
152
return NULL;
128
153
}
129
154
new_plugin->argv[0] = copy_name;
130
155
new_plugin->argv[1] = NULL;
131
132
new_plugin->environ = malloc(sizeof(char *));
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
133
160
if(new_plugin->environ == NULL){
161
int e = errno;
134
162
free(copy_name);
135
163
free(new_plugin->argv);
136
164
free(new_plugin);
165
errno = e;
137
166
return NULL;
138
167
}
139
168
new_plugin->environ[0] = NULL;
169
140
170
/* Append the new plugin to the list */
141
*plugin_list = new_plugin;
171
plugin_list = new_plugin;
142
172
return new_plugin;
143
173
}
144
174
145
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
146
177
static bool add_to_char_array(const char *new, char ***array,
147
178
int *len){
148
179
/* Resize the pointed-to array to hold one more pointer */
149
*array = realloc(*array, sizeof(char *)
150
* (size_t) ((*len) + 2));
180
char **new_array = NULL;
181
do {
182
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
183
new_array = reallocarray(*array, (size_t)((*len) + 2),
184
sizeof(char *));
185
#else
186
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
187
/* overflow */
188
new_array = NULL;
189
errno = ENOMEM;
190
} else {
191
new_array = realloc(*array, (size_t)((*len) + 2)
192
* sizeof(char *));
193
}
194
#endif
195
} while(new_array == NULL and errno == EINTR);
151
196
/* Malloc check */
152
if(*array == NULL){
197
if(new_array == NULL){
153
198
return false;
154
199
}
200
*array = new_array;
155
201
/* Make a copy of the new string */
156
char *copy = strdup(new);
202
char *copy;
203
do {
204
copy = strdup(new);
205
} while(copy == NULL and errno == EINTR);
157
206
if(copy == NULL){
158
207
return false;
159
208
}
166
215
}
167
216
168
217
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
169
219
static bool add_argument(plugin *p, const char *arg){
170
220
if(p == NULL){
171
221
return false;
174
224
}
175
225
176
226
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
227
__attribute__((nonnull(2), warn_unused_result))
228
static bool add_environment(plugin *p, const char *def, bool replace){
178
229
if(p == NULL){
179
230
return false;
180
231
}
232
/* namelen = length of name of environment variable */
233
size_t namelen = (size_t)(strchrnul(def, '=') - def);
234
/* Search for this environment variable */
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
237
/* It already exists */
238
if(replace){
239
char *new_envdef;
240
do {
241
new_envdef = realloc(*envdef, strlen(def) + 1);
242
} while(new_envdef == NULL and errno == EINTR);
243
if(new_envdef == NULL){
244
return false;
245
}
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
248
}
249
return true;
250
}
251
}
181
252
return add_to_char_array(def, &(p->environ), &(p->envc));
182
253
}
183
254
184
255
#ifndef O_CLOEXEC
185
256
/*
186
257
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
258
* Descriptor Flags".
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
259
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
189
260
*/
190
static int set_cloexec_flag(int fd)
191
{
192
int ret = fcntl(fd, F_GETFD, 0);
261
__attribute__((warn_unused_result))
262
static int set_cloexec_flag(int fd){
263
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
193
264
/* If reading the flags failed, return error indication now. */
194
265
if(ret < 0){
195
266
return ret;
196
267
}
197
268
/* Store modified flag word in the descriptor. */
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
269
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
270
ret | FD_CLOEXEC));
199
271
}
272
#endif /* not O_CLOEXEC */
200
273
201
process *process_list = NULL;
202
274
203
275
/* Mark processes as completed when they exit, and save their exit
204
276
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
277
static void handle_sigchld(__attribute__((unused)) int sig){
278
int old_errno = errno;
206
279
while(true){
207
process *proc = process_list;
280
plugin *proc = plugin_list;
208
281
int status;
209
282
pid_t pid = waitpid(-1, &status, WNOHANG);
210
283
if(pid == 0){
212
285
break;
213
286
}
214
287
if(pid == -1){
215
if (errno != ECHILD){
216
perror("waitpid");
288
if(errno == ECHILD){
289
/* No child processes */
290
break;
217
291
}
218
/* No child processes */
219
break;
292
error(0, errno, "waitpid");
220
293
}
221
294
222
295
/* A child exited, find it in process_list */
223
296
while(proc != NULL and proc->pid != pid){
224
297
proc = proc->next;
228
301
continue;
229
302
}
230
303
proc->status = status;
231
proc->completed = true;
304
proc->completed = 1;
232
305
}
306
errno = old_errno;
233
307
}
234
308
235
bool print_out_password(const char *buffer, size_t length){
309
/* Prints out a password to stdout */
310
__attribute__((nonnull, warn_unused_result))
311
static bool print_out_password(const char *buffer, size_t length){
236
312
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
313
for(size_t written = 0; written < length; written += (size_t)ret){
241
314
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
315
length - written));
247
320
return true;
248
321
}
249
322
250
char **add_to_argv(char **argv, int *argc, char *arg){
251
if (argv == NULL){
252
*argc = 1;
253
argv = malloc(sizeof(char*) * 2);
254
if(argv == NULL){
255
return NULL;
323
/* Removes and free a plugin from the plugin list */
324
__attribute__((nonnull))
325
static void free_plugin(plugin *plugin_node){
326
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
328
free(*arg);
329
}
330
free(plugin_node->name);
331
free(plugin_node->argv);
332
for(char **env = plugin_node->environ; *env != NULL; env++){
333
free(*env);
334
}
335
free(plugin_node->environ);
336
free(plugin_node->buffer);
337
338
/* Removes the plugin from the singly-linked list */
339
if(plugin_node == plugin_list){
340
/* First one - simple */
341
plugin_list = plugin_list->next;
342
} else {
343
/* Second one or later */
344
for(plugin *p = plugin_list; p != NULL; p = p->next){
345
if(p->next == plugin_node){
346
p->next = plugin_node->next;
347
break;
348
}
256
349
}
257
argv[0] = NULL; /* Will be set to argv[0] in main before
258
parsing */
259
argv[1] = NULL;
260
}
261
*argc += 1;
262
argv = realloc(argv, sizeof(char *)
263
* ((unsigned int) *argc + 1));
264
if(argv == NULL){
265
return NULL;
266
}
267
argv[*argc-1] = arg;
268
argv[*argc] = NULL;
269
return argv;
350
}
351
352
free(plugin_node);
270
353
}
271
354
272
static void free_plugin_list(plugin *plugin_list){
273
for(plugin *next; plugin_list != NULL; plugin_list = next){
274
next = plugin_list->next;
275
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
276
free(*arg);
277
}
278
free(plugin_list->argv);
279
for(char **env = plugin_list->environ; *env != NULL; env++){
280
free(*env);
281
}
282
free(plugin_list->environ);
283
free(plugin_list);
355
static void free_plugin_list(void){
356
while(plugin_list != NULL){
357
free_plugin(plugin_list);
284
358
}
285
359
}
286
360
287
361
int main(int argc, char *argv[]){
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
362
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
364
char *argfile = NULL;
290
365
FILE *conffp;
291
size_t d_name_len;
292
DIR *dir = NULL;
293
struct dirent *dirst;
366
struct dirent **direntries = NULL;
294
367
struct stat st;
295
368
fd_set rfds_all;
296
369
int ret, maxfd = 0;
370
ssize_t sret;
297
371
uid_t uid = 65534;
298
372
gid_t gid = 65534;
299
373
bool debug = false;
303
377
.sa_flags = SA_NOCLDSTOP };
304
378
char **custom_argv = NULL;
305
379
int custom_argc = 0;
380
int dir_fd = -1;
306
381
307
382
/* Establish a signal handler */
308
383
sigemptyset(&sigchld_action.sa_mask);
309
384
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
310
385
if(ret == -1){
311
perror("sigaddset");
312
exitstatus = EXIT_FAILURE;
386
error(0, errno, "sigaddset");
387
exitstatus = EX_OSERR;
313
388
goto fallback;
314
389
}
315
390
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
316
391
if(ret == -1){
317
perror("sigaction");
318
exitstatus = EXIT_FAILURE;
392
error(0, errno, "sigaction");
393
exitstatus = EX_OSERR;
319
394
goto fallback;
320
395
}
321
396
324
399
{ .name = "global-options", .key = 'g',
325
400
.arg = "OPTION[,OPTION[,...]]",
326
401
.doc = "Options passed to all plugins" },
327
{ .name = "global-envs", .key = 'e',
402
{ .name = "global-env", .key = 'G',
328
403
.arg = "VAR=value",
329
404
.doc = "Environment variable passed to all plugins" },
330
405
{ .name = "options-for", .key = 'o',
331
406
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
332
407
.doc = "Options passed only to specified plugin" },
333
{ .name = "envs-for", .key = 'f',
408
{ .name = "env-for", .key = 'E',
334
409
.arg = "PLUGIN:ENV=value",
335
410
.doc = "Environment variable passed to specified plugin" },
336
411
{ .name = "disable", .key = 'd',
337
412
.arg = "PLUGIN",
338
413
.doc = "Disable a specific plugin", .group = 1 },
414
{ .name = "enable", .key = 'e',
415
.arg = "PLUGIN",
416
.doc = "Enable a specific plugin", .group = 1 },
339
417
{ .name = "plugin-dir", .key = 128,
340
418
.arg = "DIRECTORY",
341
419
.doc = "Specify a different plugin directory", .group = 2 },
342
{ .name = "userid", .key = 129,
343
.arg = "ID", .flags = 0,
344
.doc = "User ID the plugins will run as", .group = 2 },
345
{ .name = "groupid", .key = 130,
346
.arg = "ID", .flags = 0,
347
.doc = "Group ID the plugins will run as", .group = 2 },
348
{ .name = "debug", .key = 131,
349
.doc = "Debug mode", .group = 3 },
420
{ .name = "config-file", .key = 129,
421
.arg = "FILE",
422
.doc = "Specify a different configuration file", .group = 2 },
423
{ .name = "userid", .key = 130,
424
.arg = "ID", .flags = 0,
425
.doc = "User ID the plugins will run as", .group = 3 },
426
{ .name = "groupid", .key = 131,
427
.arg = "ID", .flags = 0,
428
.doc = "Group ID the plugins will run as", .group = 3 },
429
{ .name = "debug", .key = 132,
430
.doc = "Debug mode", .group = 4 },
431
{ .name = "plugin-helper-dir", .key = 133,
432
.arg = "DIRECTORY",
433
.doc = "Specify a different plugin helper directory",
434
.group = 2 },
435
/*
436
* These reproduce what we would get without ARGP_NO_HELP
437
*/
438
{ .name = "help", .key = '?',
439
.doc = "Give this help list", .group = -1 },
440
{ .name = "usage", .key = -3,
441
.doc = "Give a short usage message", .group = -1 },
442
{ .name = "version", .key = 'V',
443
.doc = "Print program version", .group = -1 },
350
444
{ .name = NULL }
351
445
};
352
446
353
error_t parse_opt (int key, char *arg, struct argp_state *state) {
354
/* Get the INPUT argument from `argp_parse', which we know is a
355
pointer to our plugin list pointer. */
356
plugin **plugins = state->input;
357
switch (key) {
358
case 'g':
359
if (arg != NULL){
360
char *p;
361
while((p = strsep(&arg, ",")) != NULL){
362
if(p[0] == '\0'){
363
continue;
364
}
365
if(not add_argument(getplugin(NULL, plugins), p)){
366
perror("add_argument");
367
return ARGP_ERR_UNKNOWN;
368
}
369
}
370
}
371
break;
372
case 'e':
373
if(arg == NULL){
374
break;
375
}
376
{
377
char *envdef = strdup(arg);
378
if(envdef == NULL){
379
break;
380
}
381
if(not add_environment(getplugin(NULL, plugins), envdef)){
382
perror("add_environment");
383
}
384
}
385
break;
386
case 'o':
387
if (arg != NULL){
388
char *p_name = strsep(&arg, ":");
389
if(p_name[0] == '\0'){
390
break;
391
}
392
char *opt = strsep(&arg, ":");
393
if(opt[0] == '\0'){
394
break;
395
}
396
if(opt != NULL){
397
char *p;
398
while((p = strsep(&opt, ",")) != NULL){
399
if(p[0] == '\0'){
400
continue;
401
}
402
if(not add_argument(getplugin(p_name, plugins), p)){
403
perror("add_argument");
404
return ARGP_ERR_UNKNOWN;
405
}
406
}
407
}
408
}
409
break;
410
case 'f':
411
if(arg == NULL){
412
break;
413
}
447
__attribute__((nonnull(3)))
448
error_t parse_opt(int key, char *arg, struct argp_state *state){
449
errno = 0;
450
switch(key){
451
char *tmp;
452
intmax_t tmp_id;
453
case 'g': /* --global-options */
454
{
455
char *plugin_option;
456
while((plugin_option = strsep(&arg, ",")) != NULL){
457
if(not add_argument(getplugin(NULL), plugin_option)){
458
break;
459
}
460
}
461
errno = 0;
462
}
463
break;
464
case 'G': /* --global-env */
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
467
}
468
break;
469
case 'o': /* --options-for */
470
{
471
char *option_list = strchr(arg, ':');
472
if(option_list == NULL){
473
argp_error(state, "No colon in \"%s\"", arg);
474
errno = EINVAL;
475
break;
476
}
477
*option_list = '\0';
478
option_list++;
479
if(arg[0] == '\0'){
480
argp_error(state, "Empty plugin name");
481
errno = EINVAL;
482
break;
483
}
484
char *option;
485
while((option = strsep(&option_list, ",")) != NULL){
486
if(not add_argument(getplugin(arg), option)){
487
break;
488
}
489
}
490
errno = 0;
491
}
492
break;
493
case 'E': /* --env-for */
414
494
{
415
495
char *envdef = strchr(arg, ':');
416
496
if(envdef == NULL){
417
break;
418
}
419
char *p_name = strndup(arg, (size_t) (envdef-arg));
420
if(p_name == NULL){
421
break;
422
}
497
argp_error(state, "No colon in \"%s\"", arg);
498
errno = EINVAL;
499
break;
500
}
501
*envdef = '\0';
423
502
envdef++;
424
if(not add_environment(getplugin(p_name, plugins), envdef)){
425
perror("add_environment");
426
}
427
}
428
break;
429
case 'd':
430
if (arg != NULL){
431
plugin *p = getplugin(arg, plugins);
432
if(p == NULL){
433
return ARGP_ERR_UNKNOWN;
434
}
435
p->disabled = true;
436
}
437
break;
438
case 128:
439
plugindir = arg;
440
break;
441
case 129:
442
uid = (uid_t)strtol(arg, NULL, 10);
443
break;
444
case 130:
445
gid = (gid_t)strtol(arg, NULL, 10);
446
break;
447
case 131:
503
if(arg[0] == '\0'){
504
argp_error(state, "Empty plugin name");
505
errno = EINVAL;
506
break;
507
}
508
if(add_environment(getplugin(arg), envdef, true)){
509
errno = 0;
510
}
511
}
512
break;
513
case 'd': /* --disable */
514
{
515
plugin *p = getplugin(arg);
516
if(p != NULL){
517
p->disabled = true;
518
errno = 0;
519
}
520
}
521
break;
522
case 'e': /* --enable */
523
{
524
plugin *p = getplugin(arg);
525
if(p != NULL){
526
p->disabled = false;
527
errno = 0;
528
}
529
}
530
break;
531
case 128: /* --plugin-dir */
532
free(plugindir);
533
plugindir = strdup(arg);
534
if(plugindir != NULL){
535
errno = 0;
536
}
537
break;
538
case 129: /* --config-file */
539
/* This is already done by parse_opt_config_file() */
540
break;
541
case 130: /* --userid */
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (uid_t)tmp_id){
545
argp_error(state, "Bad user ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)uid);
547
break;
548
}
549
uid = (uid_t)tmp_id;
550
errno = 0;
551
break;
552
case 131: /* --groupid */
553
tmp_id = strtoimax(arg, &tmp, 10);
554
if(errno != 0 or tmp == arg or *tmp != '\0'
555
or tmp_id != (gid_t)tmp_id){
556
argp_error(state, "Bad group ID number: \"%s\", using %"
557
PRIdMAX, arg, (intmax_t)gid);
558
break;
559
}
560
gid = (gid_t)tmp_id;
561
errno = 0;
562
break;
563
case 132: /* --debug */
448
564
debug = true;
449
565
break;
450
case ARGP_KEY_ARG:
451
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
452
break;
453
case ARGP_KEY_END:
454
break;
455
default:
456
return ARGP_ERR_UNKNOWN;
457
}
458
return 0;
459
}
460
461
plugin *plugin_list = NULL;
462
463
struct argp argp = { .options = options, .parser = parse_opt,
464
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
566
case 133: /* --plugin-helper-dir */
567
free(pluginhelperdir);
568
pluginhelperdir = strdup(arg);
569
if(pluginhelperdir != NULL){
570
errno = 0;
571
}
572
break;
573
/*
574
* These reproduce what we would get without ARGP_NO_HELP
575
*/
576
case '?': /* --help */
577
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
578
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
579
__builtin_unreachable();
580
case -3: /* --usage */
581
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
582
argp_state_help(state, state->out_stream,
583
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
584
__builtin_unreachable();
585
case 'V': /* --version */
586
fprintf(state->out_stream, "%s\n", argp_program_version);
587
exit(EXIT_SUCCESS);
588
break;
589
/*
590
* When adding more options before this line, remember to also add a
591
* "case" to the "parse_opt_config_file" function below.
592
*/
593
case ARGP_KEY_ARG:
594
/* Cryptsetup always passes an argument, which is an empty
595
string if "none" was specified in /etc/crypttab. So if
596
argument was empty, we ignore it silently. */
597
if(arg[0] == '\0'){
598
break;
599
}
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
605
default:
606
return ARGP_ERR_UNKNOWN;
607
}
608
return errno; /* Set to 0 at start */
609
}
610
611
/* This option parser is the same as parse_opt() above, except it
612
ignores everything but the --config-file option. */
613
error_t parse_opt_config_file(int key, char *arg,
614
__attribute__((unused))
615
struct argp_state *state){
616
errno = 0;
617
switch(key){
618
case 'g': /* --global-options */
619
case 'G': /* --global-env */
620
case 'o': /* --options-for */
621
case 'E': /* --env-for */
622
case 'd': /* --disable */
623
case 'e': /* --enable */
624
case 128: /* --plugin-dir */
625
break;
626
case 129: /* --config-file */
627
free(argfile);
628
argfile = strdup(arg);
629
if(argfile != NULL){
630
errno = 0;
631
}
632
break;
633
case 130: /* --userid */
634
case 131: /* --groupid */
635
case 132: /* --debug */
636
case 133: /* --plugin-helper-dir */
637
case '?': /* --help */
638
case -3: /* --usage */
639
case 'V': /* --version */
640
case ARGP_KEY_ARG:
641
break;
642
default:
643
return ARGP_ERR_UNKNOWN;
644
}
645
return errno;
646
}
647
648
struct argp argp = { .options = options,
649
.parser = parse_opt_config_file,
650
.args_doc = "",
465
651
.doc = "Mandos plugin runner -- Run plugins" };
466
652
467
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
468
if (ret == ARGP_ERR_UNKNOWN){
469
fprintf(stderr, "Unknown error while parsing arguments\n");
470
exitstatus = EXIT_FAILURE;
471
goto fallback;
472
}
473
474
conffp = fopen(argfile, "r");
653
/* Parse using parse_opt_config_file() in order to get the custom
654
config file location, if any. */
655
ret = argp_parse(&argp, argc, argv,
656
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
657
NULL, NULL);
658
switch(ret){
659
case 0:
660
break;
661
case ENOMEM:
662
default:
663
errno = ret;
664
error(0, errno, "argp_parse");
665
exitstatus = EX_OSERR;
666
goto fallback;
667
case EINVAL:
668
exitstatus = EX_USAGE;
669
goto fallback;
670
}
671
672
/* Reset to the normal argument parser */
673
argp.parser = parse_opt;
674
675
/* Open the configfile if available */
676
if(argfile == NULL){
677
conffp = fopen(AFILE, "r");
678
} else {
679
conffp = fopen(argfile, "r");
680
}
475
681
if(conffp != NULL){
476
682
char *org_line = NULL;
477
683
char *p, *arg, *new_arg, *line;
478
684
size_t size = 0;
479
ssize_t sret;
480
685
const char whitespace_delims[] = " \r\t\f\v\n";
481
686
const char comment_delim[] = "#";
482
687
688
custom_argc = 1;
689
custom_argv = malloc(sizeof(char*) * 2);
690
if(custom_argv == NULL){
691
error(0, errno, "malloc");
692
exitstatus = EX_OSERR;
693
goto fallback;
694
}
695
custom_argv[0] = argv[0];
696
custom_argv[1] = NULL;
697
698
/* for each line in the config file, strip whitespace and ignore
699
commented text */
483
700
while(true){
484
701
sret = getline(&org_line, &size, conffp);
485
702
if(sret == -1){
486
703
break;
487
704
}
488
705
489
706
line = org_line;
490
707
arg = strsep(&line, comment_delim);
491
708
while((p = strsep(&arg, whitespace_delims)) != NULL){
493
710
continue;
494
711
}
495
712
new_arg = strdup(p);
496
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
497
if (custom_argv == NULL){
498
perror("add_to_argv");
499
exitstatus = EXIT_FAILURE;
713
if(new_arg == NULL){
714
error(0, errno, "strdup");
715
exitstatus = EX_OSERR;
716
free(org_line);
500
717
goto fallback;
501
718
}
719
720
custom_argc += 1;
721
{
722
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
723
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
724
sizeof(char *));
725
#else
726
char **new_argv = NULL;
727
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
728
/* overflow */
729
errno = ENOMEM;
730
} else {
731
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
732
* sizeof(char *));
733
}
734
#endif
735
if(new_argv == NULL){
736
error(0, errno, "reallocarray");
737
exitstatus = EX_OSERR;
738
free(new_arg);
739
free(org_line);
740
goto fallback;
741
} else {
742
custom_argv = new_argv;
743
}
744
}
745
custom_argv[custom_argc-1] = new_arg;
746
custom_argv[custom_argc] = NULL;
502
747
}
503
748
}
749
do {
750
ret = fclose(conffp);
751
} while(ret == EOF and errno == EINTR);
752
if(ret == EOF){
753
error(0, errno, "fclose");
754
exitstatus = EX_IOERR;
755
goto fallback;
756
}
504
757
free(org_line);
505
} else{
758
} else {
506
759
/* Check for harmful errors and go to fallback. Other errors might
507
760
not affect opening plugins */
508
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
509
perror("fopen");
510
exitstatus = EXIT_FAILURE;
761
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
762
error(0, errno, "fopen");
763
exitstatus = EX_OSERR;
511
764
goto fallback;
512
765
}
513
766
}
514
767
/* If there were any arguments from the configuration file, pass
768
them to parser as command line arguments */
515
769
if(custom_argv != NULL){
516
custom_argv[0] = argv[0];
517
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,
518
&plugin_list);
519
if (ret == ARGP_ERR_UNKNOWN){
520
fprintf(stderr, "Unknown error while parsing arguments\n");
521
exitstatus = EXIT_FAILURE;
522
goto fallback;
770
ret = argp_parse(&argp, custom_argc, custom_argv,
771
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
772
NULL, NULL);
773
switch(ret){
774
case 0:
775
break;
776
case ENOMEM:
777
default:
778
errno = ret;
779
error(0, errno, "argp_parse");
780
exitstatus = EX_OSERR;
781
goto fallback;
782
case EINVAL:
783
exitstatus = EX_CONFIG;
784
goto fallback;
785
}
786
}
787
788
/* Parse actual command line arguments, to let them override the
789
config file */
790
ret = argp_parse(&argp, argc, argv,
791
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
792
NULL, NULL);
793
switch(ret){
794
case 0:
795
break;
796
case ENOMEM:
797
default:
798
errno = ret;
799
error(0, errno, "argp_parse");
800
exitstatus = EX_OSERR;
801
goto fallback;
802
case EINVAL:
803
exitstatus = EX_USAGE;
804
goto fallback;
805
}
806
807
{
808
char *pluginhelperenv;
809
bool bret = true;
810
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
811
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
812
if(ret != -1){
813
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
814
}
815
if(ret == -1 or not bret){
816
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
817
" environment variable to \"%s\" for all plugins\n",
818
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
819
}
820
if(ret != -1){
821
free(pluginhelperenv);
523
822
}
524
823
}
525
824
526
825
if(debug){
527
for(plugin *p = plugin_list; p != NULL; p=p->next){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
528
827
fprintf(stderr, "Plugin: %s has %d arguments\n",
529
828
p->name ? p->name : "Global", p->argc - 1);
530
829
for(char **a = p->argv; *a != NULL; a++){
531
830
fprintf(stderr, "\tArg: %s\n", *a);
532
831
}
533
fprintf(stderr, "...and %u environment variables\n", p->envc);
832
fprintf(stderr, "...and %d environment variables\n", p->envc);
534
833
for(char **a = p->environ; *a != NULL; a++){
535
834
fprintf(stderr, "\t%s\n", *a);
536
835
}
537
836
}
538
837
}
539
838
839
if(getuid() == 0){
840
/* Work around Debian bug #633582:
841
<https://bugs.debian.org/633582> */
842
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
843
if(plugindir_fd == -1){
844
if(errno != ENOENT){
845
error(0, errno, "open(\"" PDIR "\")");
846
}
847
} else {
848
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
849
if(ret == -1){
850
error(0, errno, "fstat");
851
} else {
852
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
853
ret = fchown(plugindir_fd, uid, gid);
854
if(ret == -1){
855
error(0, errno, "fchown");
856
}
857
}
858
}
859
close(plugindir_fd);
860
}
861
}
862
863
/* Lower permissions */
864
ret = setgid(gid);
865
if(ret == -1){
866
error(0, errno, "setgid");
867
}
540
868
ret = setuid(uid);
541
if (ret == -1){
542
perror("setuid");
543
}
544
545
setgid(gid);
546
if (ret == -1){
547
perror("setgid");
548
}
549
550
dir = opendir(plugindir);
551
if(dir == NULL){
552
perror("Could not open plugin dir");
553
exitstatus = EXIT_FAILURE;
554
goto fallback;
555
}
556
557
/* Set the FD_CLOEXEC flag on the directory, if possible */
869
if(ret == -1){
870
error(0, errno, "setuid");
871
}
872
873
/* Open plugin directory with close_on_exec flag */
558
874
{
559
int dir_fd = dirfd(dir);
560
if(dir_fd >= 0){
561
ret = set_cloexec_flag(dir_fd);
562
if(ret < 0){
563
perror("set_cloexec_flag");
564
exitstatus = EXIT_FAILURE;
565
goto fallback;
875
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
876
#ifdef O_CLOEXEC
877
O_CLOEXEC
878
#else /* not O_CLOEXEC */
879
0
880
#endif /* not O_CLOEXEC */
881
);
882
if(dir_fd == -1){
883
error(0, errno, "Could not open plugin dir");
884
exitstatus = EX_UNAVAILABLE;
885
goto fallback;
886
}
887
888
#ifndef O_CLOEXEC
889
/* Set the FD_CLOEXEC flag on the directory */
890
ret = set_cloexec_flag(dir_fd);
891
if(ret < 0){
892
error(0, errno, "set_cloexec_flag");
893
exitstatus = EX_OSERR;
894
goto fallback;
895
}
896
#endif /* O_CLOEXEC */
897
}
898
899
int good_name(const struct dirent * const dirent){
900
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
901
"*.dpkg-old", "*.dpkg-bak",
902
"*.dpkg-divert", NULL };
903
#ifdef __GNUC__
904
#pragma GCC diagnostic push
905
#pragma GCC diagnostic ignored "-Wcast-qual"
906
#endif
907
for(const char **pat = (const char **)patterns;
908
*pat != NULL; pat++){
909
#ifdef __GNUC__
910
#pragma GCC diagnostic pop
911
#endif
912
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
913
!= FNM_NOMATCH){
914
if(debug){
915
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
916
" matching pattern %s\n", dirent->d_name, *pat);
917
}
918
return 0;
566
919
}
567
920
}
921
return 1;
922
}
923
924
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
925
alphasort);
926
if(numplugins == -1){
927
error(0, errno, "Could not scan plugin dir");
928
direntries = NULL;
929
exitstatus = EX_OSERR;
930
goto fallback;
568
931
}
569
932
570
933
FD_ZERO(&rfds_all);
571
934
572
while(true){
573
dirst = readdir(dir);
574
575
// All directory entries have been processed
576
if(dirst == NULL){
577
if (errno == EBADF){
578
perror("readdir");
579
exitstatus = EXIT_FAILURE;
580
goto fallback;
581
}
582
break;
583
}
584
585
d_name_len = strlen(dirst->d_name);
586
587
// Ignore dotfiles, backup files and other junk
588
{
589
bool bad_name = false;
590
591
const char const *bad_prefixes[] = { ".", "#", NULL };
592
593
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
594
".dpkg-old",
595
".dpkg-divert", NULL };
596
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
597
size_t pre_len = strlen(*pre);
598
if((d_name_len >= pre_len)
599
and strncmp((dirst->d_name), *pre, pre_len) == 0){
600
if(debug){
601
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
602
" with bad prefix %s\n", dirst->d_name, *pre);
603
}
604
bad_name = true;
605
break;
606
}
607
}
608
609
if(bad_name){
610
continue;
611
}
612
613
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
614
size_t suf_len = strlen(*suf);
615
if((d_name_len >= suf_len)
616
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
617
== 0)){
618
if(debug){
619
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
620
" with bad suffix %s\n", dirst->d_name, *suf);
621
}
622
bad_name = true;
623
break;
624
}
625
}
626
627
if(bad_name){
628
continue;
629
}
630
}
631
632
char *filename;
633
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
634
if(ret < 0){
635
perror("asprintf");
636
continue;
637
}
638
639
ret = stat(filename, &st);
640
if (ret == -1){
641
perror("stat");
642
free(filename);
643
continue;
644
}
645
646
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
935
/* Read and execute any executable in the plugin directory*/
936
for(int i = 0; i < numplugins; i++){
937
938
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
939
if(plugin_fd == -1){
940
error(0, errno, "Could not open plugin");
941
free(direntries[i]);
942
continue;
943
}
944
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
945
if(ret == -1){
946
error(0, errno, "stat");
947
close(plugin_fd);
948
free(direntries[i]);
949
continue;
950
}
951
952
/* Ignore non-executable files */
953
if(not S_ISREG(st.st_mode)
954
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
955
X_OK, 0)) != 0)){
647
956
if(debug){
648
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
649
" with bad type or mode\n", filename);
957
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
958
" with bad type or mode\n",
959
plugindir != NULL ? plugindir : PDIR,
960
direntries[i]->d_name);
650
961
}
651
free(filename);
962
close(plugin_fd);
963
free(direntries[i]);
652
964
continue;
653
965
}
654
plugin *p = getplugin(dirst->d_name, &plugin_list);
966
967
plugin *p = getplugin(direntries[i]->d_name);
655
968
if(p == NULL){
656
perror("getplugin");
657
free(filename);
969
error(0, errno, "getplugin");
970
close(plugin_fd);
971
free(direntries[i]);
658
972
continue;
659
973
}
660
974
if(p->disabled){
661
975
if(debug){
662
976
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
663
dirst->d_name);
977
direntries[i]->d_name);
664
978
}
665
free(filename);
979
close(plugin_fd);
980
free(direntries[i]);
666
981
continue;
667
982
}
668
983
{
669
984
/* Add global arguments to argument list for this plugin */
670
plugin *g = getplugin(NULL, &plugin_list);
985
plugin *g = getplugin(NULL);
671
986
if(g != NULL){
672
987
for(char **a = g->argv + 1; *a != NULL; a++){
673
988
if(not add_argument(p, *a)){
674
perror("add_argument");
989
error(0, errno, "add_argument");
675
990
}
676
991
}
677
992
/* Add global environment variables */
678
993
for(char **e = g->environ; *e != NULL; e++){
679
if(not add_environment(p, *e)){
680
perror("add_environment");
994
if(not add_environment(p, *e, false)){
995
error(0, errno, "add_environment");
681
996
}
682
997
}
683
998
}
684
999
}
685
/* If this plugin has any environment variables, we will call
686
using execve and need to duplicate the environment from this
687
process, too. */
1000
/* If this plugin has any environment variables, we need to
1001
duplicate the environment from this process, too. */
688
1002
if(p->environ[0] != NULL){
689
1003
for(char **e = environ; *e != NULL; e++){
690
char *copy = strdup(*e);
691
if(copy == NULL){
692
perror("strdup");
693
continue;
694
}
695
if(not add_environment(p, copy)){
696
perror("add_environment");
1004
if(not add_environment(p, *e, false)){
1005
error(0, errno, "add_environment");
697
1006
}
698
1007
}
699
1008
}
700
1009
701
1010
int pipefd[2];
702
ret = pipe(pipefd);
703
if (ret == -1){
704
perror("pipe");
705
exitstatus = EXIT_FAILURE;
706
goto fallback;
707
}
1011
#ifndef O_CLOEXEC
1012
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1013
#else /* O_CLOEXEC */
1014
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1015
#endif /* O_CLOEXEC */
1016
if(ret == -1){
1017
error(0, errno, "pipe");
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
1020
goto fallback;
1021
}
1022
if(pipefd[0] >= FD_SETSIZE){
1023
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1024
FD_SETSIZE);
1025
close(pipefd[0]);
1026
close(pipefd[1]);
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
1029
goto fallback;
1030
}
1031
#ifndef O_CLOEXEC
1032
/* Ask OS to automatic close the pipe on exec */
708
1033
ret = set_cloexec_flag(pipefd[0]);
709
1034
if(ret < 0){
710
perror("set_cloexec_flag");
711
exitstatus = EXIT_FAILURE;
1035
error(0, errno, "set_cloexec_flag");
1036
close(pipefd[0]);
1037
close(pipefd[1]);
1038
exitstatus = EX_OSERR;
1039
free(direntries[i]);
712
1040
goto fallback;
713
1041
}
714
1042
ret = set_cloexec_flag(pipefd[1]);
715
1043
if(ret < 0){
716
perror("set_cloexec_flag");
717
exitstatus = EXIT_FAILURE;
1044
error(0, errno, "set_cloexec_flag");
1045
close(pipefd[0]);
1046
close(pipefd[1]);
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
718
1049
goto fallback;
719
1050
}
1051
#endif /* not O_CLOEXEC */
720
1052
/* Block SIGCHLD until process is safely in process list */
721
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1053
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1054
&sigchld_action.sa_mask,
1055
NULL));
722
1056
if(ret < 0){
723
perror("sigprocmask");
724
exitstatus = EXIT_FAILURE;
1057
error(0, errno, "sigprocmask");
1058
exitstatus = EX_OSERR;
1059
free(direntries[i]);
725
1060
goto fallback;
726
1061
}
727
// Starting a new process to be watched
728
pid_t pid = fork();
1062
/* Starting a new process to be watched */
1063
pid_t pid;
1064
do {
1065
pid = fork();
1066
} while(pid == -1 and errno == EINTR);
729
1067
if(pid == -1){
730
perror("fork");
731
exitstatus = EXIT_FAILURE;
1068
error(0, errno, "fork");
1069
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1070
&sigchld_action.sa_mask, NULL));
1071
close(pipefd[0]);
1072
close(pipefd[1]);
1073
exitstatus = EX_OSERR;
1074
free(direntries[i]);
732
1075
goto fallback;
733
1076
}
734
1077
if(pid == 0){
735
1078
/* this is the child process */
736
1079
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
737
1080
if(ret < 0){
738
perror("sigaction");
739
_exit(EXIT_FAILURE);
1081
error(0, errno, "sigaction");
1082
_exit(EX_OSERR);
740
1083
}
741
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1084
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
742
1085
if(ret < 0){
743
perror("sigprocmask");
744
_exit(EXIT_FAILURE);
1086
error(0, errno, "sigprocmask");
1087
_exit(EX_OSERR);
745
1088
}
746
1089
747
1090
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
748
1091
if(ret == -1){
749
perror("dup2");
750
_exit(EXIT_FAILURE);
1092
error(0, errno, "dup2");
1093
_exit(EX_OSERR);
751
1094
}
752
1095
753
if(dirfd(dir) < 0){
754
/* If dir has no file descriptor, we could not set FD_CLOEXEC
755
above and must now close it manually here. */
756
closedir(dir);
757
}
758
if(p->environ[0] == NULL){
759
if(execv(filename, p->argv) < 0){
760
perror("execv");
761
_exit(EXIT_FAILURE);
762
}
763
} else {
764
if(execve(filename, p->argv, p->environ) < 0){
765
perror("execve");
766
_exit(EXIT_FAILURE);
767
}
1096
if(fexecve(plugin_fd, p->argv,
1097
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1098
error(0, errno, "fexecve for %s/%s",
1099
plugindir != NULL ? plugindir : PDIR,
1100
direntries[i]->d_name);
1101
_exit(EX_OSERR);
768
1102
}
769
1103
/* no return */
770
1104
}
771
/* parent process */
772
free(filename);
773
close(pipefd[1]); /* close unused write end of pipe */
774
process *new_process = malloc(sizeof(process));
775
if (new_process == NULL){
776
perror("malloc");
777
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1105
/* Parent process */
1106
close(pipefd[1]); /* Close unused write end of pipe */
1107
close(plugin_fd);
1108
plugin *new_plugin = getplugin(direntries[i]->d_name);
1109
if(new_plugin == NULL){
1110
error(0, errno, "getplugin");
1111
ret = (int)(TEMP_FAILURE_RETRY
1112
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1113
NULL)));
778
1114
if(ret < 0){
779
perror("sigprocmask");
1115
error(0, errno, "sigprocmask");
780
1116
}
781
exitstatus = EXIT_FAILURE;
1117
exitstatus = EX_OSERR;
1118
free(direntries[i]);
782
1119
goto fallback;
783
1120
}
1121
free(direntries[i]);
784
1122
785
*new_process = (struct process){ .pid = pid,
786
.fd = pipefd[0],
787
.next = process_list };
788
// List handling
789
process_list = new_process;
1123
new_plugin->pid = pid;
1124
new_plugin->fd = pipefd[0];
1125
1126
if(debug){
1127
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1128
new_plugin->name, (intmax_t) (new_plugin->pid));
1129
}
1130
790
1131
/* Unblock SIGCHLD so signal handler can be run if this process
791
1132
has already completed */
792
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1134
&sigchld_action.sa_mask,
1135
NULL));
793
1136
if(ret < 0){
794
perror("sigprocmask");
795
exitstatus = EXIT_FAILURE;
1137
error(0, errno, "sigprocmask");
1138
exitstatus = EX_OSERR;
796
1139
goto fallback;
797
1140
}
798
1141
799
FD_SET(new_process->fd, &rfds_all);
800
801
if (maxfd < new_process->fd){
802
maxfd = new_process->fd;
803
}
804
805
}
806
807
free_plugin_list(plugin_list);
808
plugin_list = NULL;
809
810
closedir(dir);
811
dir = NULL;
812
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
815
" directory?\n");
816
process_list = NULL;
817
}
818
while(process_list){
1142
FD_SET(new_plugin->fd, &rfds_all);
1143
1144
if(maxfd < new_plugin->fd){
1145
maxfd = new_plugin->fd;
1146
}
1147
}
1148
1149
free(direntries);
1150
direntries = NULL;
1151
close(dir_fd);
1152
dir_fd = -1;
1153
free_plugin(getplugin(NULL));
1154
1155
for(plugin *p = plugin_list; p != NULL; p = p->next){
1156
if(p->pid != 0){
1157
break;
1158
}
1159
if(p->next == NULL){
1160
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1161
" directory?\n");
1162
free_plugin_list();
1163
}
1164
}
1165
1166
/* Main loop while running plugins exist */
1167
while(plugin_list){
819
1168
fd_set rfds = rfds_all;
820
1169
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
821
if (select_ret == -1){
822
perror("select");
823
exitstatus = EXIT_FAILURE;
1170
if(select_ret == -1 and errno != EINTR){
1171
error(0, errno, "select");
1172
exitstatus = EX_OSERR;
824
1173
goto fallback;
825
1174
}
826
1175
/* OK, now either a process completed, or something can be read
827
1176
from one of them */
828
for(process *proc = process_list; proc ; proc = proc->next){
1177
for(plugin *proc = plugin_list; proc != NULL;){
829
1178
/* Is this process completely done? */
830
if(proc->eof and proc->completed){
1179
if(proc->completed and proc->eof){
831
1180
/* Only accept the plugin output if it exited cleanly */
832
1181
if(not WIFEXITED(proc->status)
833
1182
or WEXITSTATUS(proc->status) != 0){
834
1183
/* Bad exit by plugin */
1184
835
1185
if(debug){
836
1186
if(WIFEXITED(proc->status)){
837
fprintf(stderr, "Plugin %u exited with status %d\n",
838
(unsigned int) (proc->pid),
1187
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1188
" status %d\n", proc->name,
1189
(intmax_t) (proc->pid),
839
1190
WEXITSTATUS(proc->status));
840
} else if(WIFSIGNALED(proc->status)) {
841
fprintf(stderr, "Plugin %u killed by signal %d\n",
842
(unsigned int) (proc->pid),
843
WTERMSIG(proc->status));
844
} else if(WCOREDUMP(proc->status)){
845
fprintf(stderr, "Plugin %d dumped core\n",
846
(unsigned int) (proc->pid));
1191
} else if(WIFSIGNALED(proc->status)){
1192
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1193
" signal %d: %s\n", proc->name,
1194
(intmax_t) (proc->pid),
1195
WTERMSIG(proc->status),
1196
strsignal(WTERMSIG(proc->status)));
847
1197
}
848
1198
}
1199
849
1200
/* Remove the plugin */
850
1201
FD_CLR(proc->fd, &rfds_all);
1202
851
1203
/* Block signal while modifying process_list */
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1204
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1205
(SIG_BLOCK,
1206
&sigchld_action.sa_mask,
1207
NULL));
853
1208
if(ret < 0){
854
perror("sigprocmask");
855
exitstatus = EXIT_FAILURE;
1209
error(0, errno, "sigprocmask");
1210
exitstatus = EX_OSERR;
856
1211
goto fallback;
857
1212
}
858
/* Delete this process entry from the list */
859
if(process_list == proc){
860
/* First one - simple */
861
process_list = proc->next;
862
} else {
863
/* Second one or later */
864
for(process *p = process_list; p != NULL; p = p->next){
865
if(p->next == proc){
866
p->next = proc->next;
867
break;
868
}
869
}
870
}
1213
1214
plugin *next_plugin = proc->next;
1215
free_plugin(proc);
1216
proc = next_plugin;
1217
871
1218
/* We are done modifying process list, so unblock signal */
872
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
873
NULL);
1219
ret = (int)(TEMP_FAILURE_RETRY
1220
(sigprocmask(SIG_UNBLOCK,
1221
&sigchld_action.sa_mask, NULL)));
874
1222
if(ret < 0){
875
perror("sigprocmask");
876
}
877
free(proc->buffer);
878
free(proc);
879
/* We deleted this process from the list, so we can't go
880
proc->next. Therefore, start over from the beginning of
881
the process list */
882
break;
1223
error(0, errno, "sigprocmask");
1224
exitstatus = EX_OSERR;
1225
goto fallback;
1226
}
1227
1228
if(plugin_list == NULL){
1229
break;
1230
}
1231
1232
continue;
883
1233
}
1234
884
1235
/* This process exited nicely, so print its buffer */
885
1236
886
1237
bool bret = print_out_password(proc->buffer,
887
1238
proc->buffer_length);
888
1239
if(not bret){
889
perror("print_out_password");
890
exitstatus = EXIT_FAILURE;
1240
error(0, errno, "print_out_password");
1241
exitstatus = EX_IOERR;
891
1242
}
892
1243
goto fallback;
893
1244
}
1245
894
1246
/* This process has not completed. Does it have any output? */
895
1247
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
896
1248
/* This process had nothing to say at this time */
1249
proc = proc->next;
897
1250
continue;
898
1251
}
899
1252
/* Before reading, make the process' data buffer large enough */
900
1253
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
901
proc->buffer = realloc(proc->buffer, proc->buffer_size
902
+ (size_t) BUFFER_SIZE);
903
if (proc->buffer == NULL){
904
perror("malloc");
905
exitstatus = EXIT_FAILURE;
1254
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1255
+ (size_t) BUFFER_SIZE);
1256
if(new_buffer == NULL){
1257
error(0, errno, "malloc");
1258
exitstatus = EX_OSERR;
906
1259
goto fallback;
907
1260
}
1261
proc->buffer = new_buffer;
908
1262
proc->buffer_size += BUFFER_SIZE;
909
1263
}
910
1264
/* Read from the process */
911
ret = read(proc->fd, proc->buffer + proc->buffer_length,
912
BUFFER_SIZE);
913
if(ret < 0){
1265
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1266
proc->buffer
1267
+ proc->buffer_length,
1268
BUFFER_SIZE));
1269
if(sret < 0){
914
1270
/* Read error from this process; ignore the error */
1271
proc = proc->next;
915
1272
continue;
916
1273
}
917
if(ret == 0){
1274
if(sret == 0){
918
1275
/* got EOF */
919
1276
proc->eof = true;
920
1277
} else {
921
proc->buffer_length += (size_t) ret;
1278
proc->buffer_length += (size_t) sret;
922
1279
}
923
1280
}
924
1281
}
925
926
1282
1283
927
1284
fallback:
928
1285
929
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1286
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1287
and exitstatus != EX_OK)){
930
1288
/* Fallback if all plugins failed, none are found or an error
931
1289
occured */
932
1290
bool bret;
933
1291
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
934
1292
char *passwordbuffer = getpass("Password: ");
935
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1293
size_t len = strlen(passwordbuffer);
1294
/* Strip trailing newline */
1295
if(len > 0 and passwordbuffer[len-1] == '\n'){
1296
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1297
len--;
1298
}
1299
bret = print_out_password(passwordbuffer, len);
936
1300
if(not bret){
937
perror("print_out_password");
938
exitstatus = EXIT_FAILURE;
1301
error(0, errno, "print_out_password");
1302
exitstatus = EX_IOERR;
939
1303
}
940
1304
}
941
1305
942
1306
/* Restore old signal handler */
943
1307
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
944
1308
if(ret == -1){
945
perror("sigaction");
946
exitstatus = EXIT_FAILURE;
1309
error(0, errno, "sigaction");
1310
exitstatus = EX_OSERR;
947
1311
}
948
1312
949
1313
if(custom_argv != NULL){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
1314
for(char **arg = custom_argv+1; *arg != NULL; arg++){
951
1315
free(*arg);
952
1316
}
953
1317
free(custom_argv);
954
1318
}
955
free_plugin_list(plugin_list);
956
957
if(dir != NULL){
958
closedir(dir);
1319
1320
free(direntries);
1321
1322
if(dir_fd != -1){
1323
close(dir_fd);
959
1324
}
960
1325
961
/* Free the process list and kill the processes */
962
for(process *next; process_list != NULL; process_list = next){
963
next = process_list->next;
964
close(process_list->fd);
965
ret = kill(process_list->pid, SIGTERM);
966
if(ret == -1 and errno != ESRCH){
967
/* set-uid proccesses migth not get closed */
968
perror("kill");
1326
/* Kill the processes */
1327
for(plugin *p = plugin_list; p != NULL; p = p->next){
1328
if(p->pid != 0){
1329
close(p->fd);
1330
ret = kill(p->pid, SIGTERM);
1331
if(ret == -1 and errno != ESRCH){
1332
/* Set-uid proccesses might not get closed */
1333
error(0, errno, "kill");
1334
}
969
1335
}
970
free(process_list->buffer);
971
free(process_list);
972
1336
}
973
1337
974
1338
/* Wait for any remaining child processes to terminate */
975
do{
1339
do {
976
1340
ret = wait(NULL);
977
1341
} while(ret >= 0);
978
1342
if(errno != ECHILD){
979
perror("wait");
1343
error(0, errno, "wait");
980
1344
}
981
1345
1346
free_plugin_list();
1347
1348
free(plugindir);
1349
free(pluginhelperdir);
1350
free(argfile);
1351
982
1352
return exitstatus;
983
1353
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0