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- Committer: Teddy Hogeborn
- Date: 2024-11-17 18:43:11 UTC
- mto: This revision was merged to the branch mainline in revision 412.
- Revision ID: teddy@recompile.se-20241117184311-ox25kvngy62h209g
Debian package: Avoid suggesting a C compiler unnecessarily
The list of suggested packages, meant to enable the "mandos" program
to find the correct value of SO_BINDTODEVICE by using a C compiler,
are not necessary when Python 3.3 or later is used, since it has the
SO_BINDTODEVICE constant defined in the "socket" module. Also, Python
2.6 or older has the same constant in the old "IN" module. Therefore,
we should suggest these Python versions as alternatives to a C
compiler, so that a C compiler is not installed unnecessarily.
debian/control (Package: mandos/Suggests): Add "python3 (>= 3.3)" and
"python (<= 2.6)" as alternatives to "libc6-dev | libc-dev" and
"c-compiler".
The list of suggested packages, meant to enable the "mandos" program
to find the correct value of SO_BINDTODEVICE by using a C compiler,
are not necessary when Python 3.3 or later is used, since it has the
SO_BINDTODEVICE constant defined in the "socket" module. Also, Python
2.6 or older has the same constant in the old "IN" module. Therefore,
we should suggest these Python versions as alternatives to a C
compiler, so that a C compiler is not installed unnecessarily.
debian/control (Package: mandos/Suggests): Add "python3 (>= 3.3)" and
"python (<= 2.6)" as alternatives to "libc6-dev | libc-dev" and
"c-compiler".
- 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 © 2008-2022 Teddy Hogeborn
6
* Copyright © 2008-2022 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
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
27
getline(), asprintf(), O_CLOEXEC,
28
scandirat(), pipe2() */
29
#include <argp.h> /* argp_program_version,
30
argp_program_bug_address,
31
struct argp_option,
32
struct argp_state, argp_error(),
33
ARGP_NO_EXIT, argp_state_help,
34
ARGP_HELP_STD_HELP,
35
ARGP_HELP_USAGE, ARGP_HELP_EXIT_OK,
36
ARGP_KEY_ARG, ARGP_ERR_UNKNOWN,
37
struct argp, argp_parse(),
38
ARGP_IN_ORDER, ARGP_NO_HELP */
39
#include <stdbool.h> /* bool, false, true */
40
#include <sys/types.h> /* pid_t, sig_atomic_t, uid_t, gid_t,
41
getuid(), setgid(), setuid() */
26
42
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#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() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
#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() */
43
#include <iso646.h> /* or, and, not */
44
#include <string.h> /* strcmp(), strdup(), strchrnul(),
45
strncmp(), strlen(), strcpy(),
46
strsep(), strchr(), strsignal() */
47
#include <stdlib.h> /* malloc(), free(), reallocarray(),
48
realloc(), EXIT_SUCCESS */
49
#include <errno.h> /* errno, EINTR, ENOMEM, ECHILD,
50
error_t, EINVAL, EMFILE, ENFILE,
51
ENOENT, ESRCH */
52
#include <stdint.h> /* SIZE_MAX */
53
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
54
getline(), asprintf(), O_CLOEXEC,
55
scandirat(), pipe2() */
56
#include <unistd.h> /* TEMP_FAILURE_RETRY(), ssize_t,
57
write(), STDOUT_FILENO, uid_t,
58
gid_t, getuid(), fchown(), close(),
59
symlink(), setgid(), setuid(),
60
faccessat(), X_OK, pipe(), pipe2(),
61
fork(), _exit(), dup2(), fexecve(),
62
read(), getpass() */
52
63
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
55
#include <errno.h> /* errno */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
60
#include <signal.h> /* struct sigaction, sigemptyset(),
61
sigaddset(), sigaction(),
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
63
SIG_UNBLOCK, kill() */
64
#include <errno.h> /* errno, EBADF */
64
FD_CLOEXEC, open(), O_RDONLY,
65
O_CLOEXEC, openat() */
66
#include <sys/wait.h> /* waitpid(), WNOHANG, WIFEXITED(),
67
WEXITSTATUS(), WIFSIGNALED(),
68
WTERMSIG(), wait() */
69
#include <error.h> /* error() */
70
#include <stdio.h> /* FILE, fprintf(), fopen(),
71
getline(), fclose(), EOF,
72
asprintf(), stderr */
73
#include <dirent.h> /* struct dirent, scandirat(),
74
alphasort() */
75
#include <sys/stat.h> /* struct stat, fstat(), S_ISDIR(),
76
lstat(), S_ISREG() */
77
#include <sys/select.h> /* fd_set, FD_ZERO(), FD_SETSIZE,
78
FD_SET(), select(), FD_CLR(),
79
FD_ISSET() */
80
#include <signal.h> /* struct sigaction, SA_NOCLDSTOP,
81
sigemptyset(), sigaddset(),
82
SIGCHLD, sigprocmask(), SIG_BLOCK,
83
SIG_UNBLOCK, kill(), SIGTERM */
84
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
85
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
86
#include <inttypes.h> /* intmax_t, strtoimax(), PRIdMAX */
87
#include <fnmatch.h> /* fnmatch(), FNM_FILE_NAME,
88
FNM_PERIOD, FNM_NOMATCH */
65
89
66
90
#define BUFFER_SIZE 256
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
91
92
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
94
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
95
96
const char *argp_program_version = "plugin-runner " VERSION;
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
85
98
86
99
typedef struct plugin{
87
100
char *name; /* can be NULL or any plugin name */
90
103
char **environ;
91
104
int envc;
92
105
bool disabled;
106
107
/* Variables used for running processes*/
108
pid_t pid;
109
int fd;
110
char *buffer;
111
size_t buffer_size;
112
size_t buffer_length;
113
bool eof;
114
volatile sig_atomic_t completed;
115
int status;
93
116
struct plugin *next;
94
117
} plugin;
95
118
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
if ((p->name == name)
99
or (p->name and name and (strcmp(p->name, name) == 0))){
119
static plugin *plugin_list = NULL;
120
121
/* Gets an existing plugin based on name,
122
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
124
static plugin *getplugin(char *name){
125
/* Check for existing plugin with that name */
126
for(plugin *p = plugin_list; p != NULL; p = p->next){
127
if((p->name == name)
128
or (p->name and name and (strcmp(p->name, name) == 0))){
100
129
return p;
101
130
}
102
131
}
103
132
/* Create a new plugin */
104
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
133
plugin *new_plugin = NULL;
134
do {
135
new_plugin = malloc(sizeof(plugin));
136
} while(new_plugin == NULL and errno == EINTR);
137
if(new_plugin == NULL){
106
138
return NULL;
107
139
}
108
140
char *copy_name = NULL;
109
141
if(name != NULL){
110
copy_name = strdup(name);
111
}
112
if(copy_name == NULL){
113
return NULL;
114
}
115
116
*new_plugin = (plugin) { .name = copy_name,
117
.argc = 1,
118
.envc = 0,
119
.disabled = false,
120
.next = *plugin_list };
121
122
new_plugin->argv = malloc(sizeof(char *) * 2);
123
if (new_plugin->argv == NULL){
142
do {
143
copy_name = strdup(name);
144
} while(copy_name == NULL and errno == EINTR);
145
if(copy_name == NULL){
146
int e = errno;
147
free(new_plugin);
148
errno = e;
149
return NULL;
150
}
151
}
152
153
*new_plugin = (plugin){ .name = copy_name,
154
.argc = 1,
155
.disabled = false,
156
.next = plugin_list };
157
158
do {
159
new_plugin->argv = malloc(sizeof(char *) * 2);
160
} while(new_plugin->argv == NULL and errno == EINTR);
161
if(new_plugin->argv == NULL){
162
int e = errno;
124
163
free(copy_name);
125
164
free(new_plugin);
165
errno = e;
126
166
return NULL;
127
167
}
128
168
new_plugin->argv[0] = copy_name;
129
169
new_plugin->argv[1] = NULL;
130
131
new_plugin->environ = malloc(sizeof(char *));
170
171
do {
172
new_plugin->environ = malloc(sizeof(char *));
173
} while(new_plugin->environ == NULL and errno == EINTR);
132
174
if(new_plugin->environ == NULL){
175
int e = errno;
133
176
free(copy_name);
134
177
free(new_plugin->argv);
135
178
free(new_plugin);
179
errno = e;
136
180
return NULL;
137
181
}
138
182
new_plugin->environ[0] = NULL;
183
139
184
/* Append the new plugin to the list */
140
*plugin_list = new_plugin;
185
plugin_list = new_plugin;
141
186
return new_plugin;
142
187
}
143
188
144
189
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
145
191
static bool add_to_char_array(const char *new, char ***array,
146
192
int *len){
147
193
/* Resize the pointed-to array to hold one more pointer */
148
*array = realloc(*array, sizeof(char *)
149
* (size_t) ((*len) + 2));
194
char **new_array = NULL;
195
do {
196
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
197
new_array = reallocarray(*array, (size_t)((*len) + 2),
198
sizeof(char *));
199
#else
200
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
201
/* overflow */
202
new_array = NULL;
203
errno = ENOMEM;
204
} else {
205
new_array = realloc(*array, (size_t)((*len) + 2)
206
* sizeof(char *));
207
}
208
#endif
209
} while(new_array == NULL and errno == EINTR);
150
210
/* Malloc check */
151
if(*array == NULL){
211
if(new_array == NULL){
152
212
return false;
153
213
}
214
*array = new_array;
154
215
/* Make a copy of the new string */
155
char *copy = strdup(new);
216
char *copy;
217
do {
218
copy = strdup(new);
219
} while(copy == NULL and errno == EINTR);
156
220
if(copy == NULL){
157
221
return false;
158
222
}
165
229
}
166
230
167
231
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
168
233
static bool add_argument(plugin *p, const char *arg){
169
234
if(p == NULL){
170
235
return false;
173
238
}
174
239
175
240
/* Add to a plugin's environment */
176
static bool add_environment(plugin *p, const char *def){
241
__attribute__((nonnull(2), warn_unused_result))
242
static bool add_environment(plugin *p, const char *def, bool replace){
177
243
if(p == NULL){
178
244
return false;
179
245
}
246
/* namelen = length of name of environment variable */
247
size_t namelen = (size_t)(strchrnul(def, '=') - def);
248
/* Search for this environment variable */
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
251
/* It already exists */
252
if(replace){
253
char *new_envdef;
254
do {
255
new_envdef = realloc(*envdef, strlen(def) + 1);
256
} while(new_envdef == NULL and errno == EINTR);
257
if(new_envdef == NULL){
258
return false;
259
}
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
262
}
263
return true;
264
}
265
}
180
266
return add_to_char_array(def, &(p->environ), &(p->envc));
181
267
}
182
268
183
269
#ifndef O_CLOEXEC
184
270
/*
185
271
* Based on the example in the GNU LibC manual chapter 13.13 "File
186
272
* Descriptor Flags".
187
* *Note File Descriptor Flags:(libc)Descriptor Flags.
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
188
274
*/
189
static int set_cloexec_flag(int fd)
190
{
191
int ret = fcntl(fd, F_GETFD, 0);
275
__attribute__((warn_unused_result))
276
static int set_cloexec_flag(int fd){
277
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
192
278
/* If reading the flags failed, return error indication now. */
193
279
if(ret < 0){
194
280
return ret;
195
281
}
196
282
/* Store modified flag word in the descriptor. */
197
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
ret | FD_CLOEXEC));
198
285
}
199
200
process *process_list = NULL;
201
202
/* Mark a process as completed when it exits, and save its exit
286
#endif /* not O_CLOEXEC */
287
288
289
/* Mark processes as completed when they exit, and save their exit
203
290
status. */
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
206
int status;
207
pid_t pid = wait(&status);
208
if(pid == -1){
209
perror("wait");
210
return;
211
}
212
while(proc != NULL and proc->pid != pid){
213
proc = proc->next;
214
}
215
if(proc == NULL){
216
/* Process not found in process list */
217
return;
218
}
219
proc->status = status;
220
proc->completed = true;
291
static void handle_sigchld(__attribute__((unused)) int sig){
292
int old_errno = errno;
293
while(true){
294
plugin *proc = plugin_list;
295
int status;
296
pid_t pid = waitpid(-1, &status, WNOHANG);
297
if(pid == 0){
298
/* Only still running child processes */
299
break;
300
}
301
if(pid == -1){
302
if(errno == ECHILD){
303
/* No child processes */
304
break;
305
}
306
error(0, errno, "waitpid");
307
}
308
309
/* A child exited, find it in process_list */
310
while(proc != NULL and proc->pid != pid){
311
proc = proc->next;
312
}
313
if(proc == NULL){
314
/* Process not found in process list */
315
continue;
316
}
317
proc->status = status;
318
proc->completed = 1;
319
}
320
errno = old_errno;
221
321
}
222
322
223
bool print_out_password(const char *buffer, size_t length){
323
/* Prints out a password to stdout */
324
__attribute__((nonnull, warn_unused_result))
325
static bool print_out_password(const char *buffer, size_t length){
224
326
ssize_t ret;
225
if(length>0 and buffer[length-1] == '\n'){
226
length--;
227
}
228
327
for(size_t written = 0; written < length; written += (size_t)ret){
229
328
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
230
329
length - written));
235
334
return true;
236
335
}
237
336
238
char **add_to_argv(char **argv, int *argc, char *arg){
239
if (argv == NULL){
240
*argc = 1;
241
argv = malloc(sizeof(char*) * 2);
242
if(argv == NULL){
243
return NULL;
337
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
339
static void free_plugin(plugin *plugin_node){
340
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
342
free(*arg);
343
}
344
free(plugin_node->name);
345
free(plugin_node->argv);
346
for(char **env = plugin_node->environ; *env != NULL; env++){
347
free(*env);
348
}
349
free(plugin_node->environ);
350
free(plugin_node->buffer);
351
352
/* Removes the plugin from the singly-linked list */
353
if(plugin_node == plugin_list){
354
/* First one - simple */
355
plugin_list = plugin_list->next;
356
} else {
357
/* Second one or later */
358
for(plugin *p = plugin_list; p != NULL; p = p->next){
359
if(p->next == plugin_node){
360
p->next = plugin_node->next;
361
break;
362
}
244
363
}
245
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
246
argv[1] = NULL;
247
}
248
*argc += 1;
249
argv = realloc(argv, sizeof(char *)
250
* ((unsigned int) *argc + 1));
251
if(argv == NULL){
252
return NULL;
253
}
254
argv[*argc-1] = arg;
255
argv[*argc] = NULL;
256
return argv;
364
}
365
366
free(plugin_node);
257
367
}
258
368
259
static void free_plugin_list(plugin *plugin_list){
260
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
261
next = plugin_list->next;
262
free(plugin_list->name);
263
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
264
free(*arg);
265
}
266
free(plugin_list->argv);
267
for(char **env = plugin_list->environ; *env != NULL; env++){
268
free(*env);
269
}
270
free(plugin_list->environ);
271
free(plugin_list);
272
}
369
static void free_plugin_list(void){
370
while(plugin_list != NULL){
371
free_plugin(plugin_list);
372
}
273
373
}
274
374
275
375
int main(int argc, char *argv[]){
276
const char *plugindir = "/lib/mandos/plugins.d";
277
const char *argfile = ARGFILE;
376
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
378
char *argfile = NULL;
278
379
FILE *conffp;
279
size_t d_name_len;
280
DIR *dir = NULL;
281
struct dirent *dirst;
380
struct dirent **direntries = NULL;
282
381
struct stat st;
283
382
fd_set rfds_all;
284
383
int ret, maxfd = 0;
384
ssize_t sret;
285
385
uid_t uid = 65534;
286
386
gid_t gid = 65534;
287
387
bool debug = false;
291
391
.sa_flags = SA_NOCLDSTOP };
292
392
char **custom_argv = NULL;
293
393
int custom_argc = 0;
394
int dir_fd = -1;
294
395
295
396
/* Establish a signal handler */
296
397
sigemptyset(&sigchld_action.sa_mask);
297
398
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
298
399
if(ret == -1){
299
perror("sigaddset");
300
exitstatus = EXIT_FAILURE;
400
error(0, errno, "sigaddset");
401
exitstatus = EX_OSERR;
301
402
goto fallback;
302
403
}
303
404
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
304
405
if(ret == -1){
305
perror("sigaction");
306
exitstatus = EXIT_FAILURE;
406
error(0, errno, "sigaction");
407
exitstatus = EX_OSERR;
307
408
goto fallback;
308
409
}
309
410
312
413
{ .name = "global-options", .key = 'g',
313
414
.arg = "OPTION[,OPTION[,...]]",
314
415
.doc = "Options passed to all plugins" },
315
{ .name = "global-envs", .key = 'e',
416
{ .name = "global-env", .key = 'G',
316
417
.arg = "VAR=value",
317
418
.doc = "Environment variable passed to all plugins" },
318
419
{ .name = "options-for", .key = 'o',
319
420
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
320
421
.doc = "Options passed only to specified plugin" },
321
{ .name = "envs-for", .key = 'f',
422
{ .name = "env-for", .key = 'E',
322
423
.arg = "PLUGIN:ENV=value",
323
424
.doc = "Environment variable passed to specified plugin" },
324
425
{ .name = "disable", .key = 'd',
325
426
.arg = "PLUGIN",
326
427
.doc = "Disable a specific plugin", .group = 1 },
428
{ .name = "enable", .key = 'e',
429
.arg = "PLUGIN",
430
.doc = "Enable a specific plugin", .group = 1 },
327
431
{ .name = "plugin-dir", .key = 128,
328
432
.arg = "DIRECTORY",
329
433
.doc = "Specify a different plugin directory", .group = 2 },
330
{ .name = "userid", .key = 129,
331
.arg = "ID", .flags = 0,
332
.doc = "User ID the plugins will run as", .group = 2 },
333
{ .name = "groupid", .key = 130,
334
.arg = "ID", .flags = 0,
335
.doc = "Group ID the plugins will run as", .group = 2 },
336
{ .name = "debug", .key = 131,
337
.doc = "Debug mode", .group = 3 },
434
{ .name = "config-file", .key = 129,
435
.arg = "FILE",
436
.doc = "Specify a different configuration file", .group = 2 },
437
{ .name = "userid", .key = 130,
438
.arg = "ID", .flags = 0,
439
.doc = "User ID the plugins will run as", .group = 3 },
440
{ .name = "groupid", .key = 131,
441
.arg = "ID", .flags = 0,
442
.doc = "Group ID the plugins will run as", .group = 3 },
443
{ .name = "debug", .key = 132,
444
.doc = "Debug mode", .group = 4 },
445
{ .name = "plugin-helper-dir", .key = 133,
446
.arg = "DIRECTORY",
447
.doc = "Specify a different plugin helper directory",
448
.group = 2 },
449
/*
450
* These reproduce what we would get without ARGP_NO_HELP
451
*/
452
{ .name = "help", .key = '?',
453
.doc = "Give this help list", .group = -1 },
454
{ .name = "usage", .key = -3,
455
.doc = "Give a short usage message", .group = -1 },
456
{ .name = "version", .key = 'V',
457
.doc = "Print program version", .group = -1 },
338
458
{ .name = NULL }
339
459
};
340
460
341
error_t parse_opt (int key, char *arg, struct argp_state *state) {
342
/* Get the INPUT argument from `argp_parse', which we know is a
343
pointer to our plugin list pointer. */
344
plugin **plugins = state->input;
345
switch (key) {
346
case 'g':
347
if (arg != NULL){
348
char *p;
349
while((p = strsep(&arg, ",")) != NULL){
350
if(p[0] == '\0'){
351
continue;
352
}
353
if(not add_argument(getplugin(NULL, plugins), p)){
354
perror("add_argument");
355
return ARGP_ERR_UNKNOWN;
356
}
357
}
358
}
359
break;
360
case 'e':
361
if(arg == NULL){
362
break;
363
}
364
{
365
char *envdef = strdup(arg);
366
if(envdef == NULL){
367
break;
368
}
369
if(not add_environment(getplugin(NULL, plugins), envdef)){
370
perror("add_environment");
371
}
372
}
373
break;
374
case 'o':
375
if (arg != NULL){
376
char *p_name = strsep(&arg, ":");
377
if(p_name[0] == '\0'){
378
break;
379
}
380
char *opt = strsep(&arg, ":");
381
if(opt[0] == '\0'){
382
break;
383
}
384
if(opt != NULL){
385
char *p;
386
while((p = strsep(&opt, ",")) != NULL){
387
if(p[0] == '\0'){
388
continue;
389
}
390
if(not add_argument(getplugin(p_name, plugins), p)){
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
393
}
394
}
395
}
396
}
397
break;
398
case 'f':
399
if(arg == NULL){
400
break;
401
}
461
__attribute__((nonnull(3)))
462
error_t parse_opt(int key, char *arg, struct argp_state *state){
463
errno = 0;
464
switch(key){
465
char *tmp;
466
intmax_t tmp_id;
467
case 'g': /* --global-options */
468
{
469
char *plugin_option;
470
while((plugin_option = strsep(&arg, ",")) != NULL){
471
if(not add_argument(getplugin(NULL), plugin_option)){
472
break;
473
}
474
}
475
errno = 0;
476
}
477
break;
478
case 'G': /* --global-env */
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
481
}
482
break;
483
case 'o': /* --options-for */
484
{
485
char *option_list = strchr(arg, ':');
486
if(option_list == NULL){
487
argp_error(state, "No colon in \"%s\"", arg);
488
errno = EINVAL;
489
break;
490
}
491
*option_list = '\0';
492
option_list++;
493
if(arg[0] == '\0'){
494
argp_error(state, "Empty plugin name");
495
errno = EINVAL;
496
break;
497
}
498
char *option;
499
while((option = strsep(&option_list, ",")) != NULL){
500
if(not add_argument(getplugin(arg), option)){
501
break;
502
}
503
}
504
errno = 0;
505
}
506
break;
507
case 'E': /* --env-for */
402
508
{
403
509
char *envdef = strchr(arg, ':');
404
510
if(envdef == NULL){
405
break;
406
}
407
char *p_name = strndup(arg, (size_t) (envdef-arg));
408
if(p_name == NULL){
409
break;
410
}
511
argp_error(state, "No colon in \"%s\"", arg);
512
errno = EINVAL;
513
break;
514
}
515
*envdef = '\0';
411
516
envdef++;
412
if(not add_environment(getplugin(p_name, plugins), envdef)){
413
perror("add_environment");
414
}
415
}
416
break;
417
case 'd':
418
if (arg != NULL){
419
plugin *p = getplugin(arg, plugins);
420
if(p == NULL){
421
return ARGP_ERR_UNKNOWN;
422
}
423
p->disabled = true;
424
}
425
break;
426
case 128:
427
plugindir = arg;
428
break;
429
case 129:
430
uid = (uid_t)strtol(arg, NULL, 10);
431
break;
432
case 130:
433
gid = (gid_t)strtol(arg, NULL, 10);
434
break;
435
case 131:
517
if(arg[0] == '\0'){
518
argp_error(state, "Empty plugin name");
519
errno = EINVAL;
520
break;
521
}
522
if(add_environment(getplugin(arg), envdef, true)){
523
errno = 0;
524
}
525
}
526
break;
527
case 'd': /* --disable */
528
{
529
plugin *p = getplugin(arg);
530
if(p != NULL){
531
p->disabled = true;
532
errno = 0;
533
}
534
}
535
break;
536
case 'e': /* --enable */
537
{
538
plugin *p = getplugin(arg);
539
if(p != NULL){
540
p->disabled = false;
541
errno = 0;
542
}
543
}
544
break;
545
case 128: /* --plugin-dir */
546
free(plugindir);
547
plugindir = strdup(arg);
548
if(plugindir != NULL){
549
errno = 0;
550
}
551
break;
552
case 129: /* --config-file */
553
/* This is already done by parse_opt_config_file() */
554
break;
555
case 130: /* --userid */
556
tmp_id = strtoimax(arg, &tmp, 10);
557
if(errno != 0 or tmp == arg or *tmp != '\0'
558
or tmp_id != (uid_t)tmp_id){
559
argp_error(state, "Bad user ID number: \"%s\", using %"
560
PRIdMAX, arg, (intmax_t)uid);
561
break;
562
}
563
uid = (uid_t)tmp_id;
564
errno = 0;
565
break;
566
case 131: /* --groupid */
567
tmp_id = strtoimax(arg, &tmp, 10);
568
if(errno != 0 or tmp == arg or *tmp != '\0'
569
or tmp_id != (gid_t)tmp_id){
570
argp_error(state, "Bad group ID number: \"%s\", using %"
571
PRIdMAX, arg, (intmax_t)gid);
572
break;
573
}
574
gid = (gid_t)tmp_id;
575
errno = 0;
576
break;
577
case 132: /* --debug */
436
578
debug = true;
437
579
break;
438
case ARGP_KEY_ARG:
439
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
440
break;
441
case ARGP_KEY_END:
442
break;
443
default:
444
return ARGP_ERR_UNKNOWN;
445
}
446
return 0;
447
}
448
449
plugin *plugin_list = NULL;
450
451
struct argp argp = { .options = options, .parser = parse_opt,
452
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
580
case 133: /* --plugin-helper-dir */
581
free(pluginhelperdir);
582
pluginhelperdir = strdup(arg);
583
if(pluginhelperdir != NULL){
584
errno = 0;
585
}
586
break;
587
/*
588
* These reproduce what we would get without ARGP_NO_HELP
589
*/
590
case '?': /* --help */
591
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
592
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
593
__builtin_unreachable();
594
case -3: /* --usage */
595
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
596
argp_state_help(state, state->out_stream,
597
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
598
__builtin_unreachable();
599
case 'V': /* --version */
600
fprintf(state->out_stream, "%s\n", argp_program_version);
601
exit(EXIT_SUCCESS);
602
break;
603
/*
604
* When adding more options before this line, remember to also add a
605
* "case" to the "parse_opt_config_file" function below.
606
*/
607
case ARGP_KEY_ARG:
608
/* Cryptsetup always passes an argument, which is an empty
609
string if "none" was specified in /etc/crypttab. So if
610
argument was empty, we ignore it silently. */
611
if(arg[0] == '\0'){
612
break;
613
}
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
619
default:
620
return ARGP_ERR_UNKNOWN;
621
}
622
return errno; /* Set to 0 at start */
623
}
624
625
/* This option parser is the same as parse_opt() above, except it
626
ignores everything but the --config-file option. */
627
error_t parse_opt_config_file(int key, char *arg,
628
__attribute__((unused))
629
struct argp_state *state){
630
errno = 0;
631
switch(key){
632
case 'g': /* --global-options */
633
case 'G': /* --global-env */
634
case 'o': /* --options-for */
635
case 'E': /* --env-for */
636
case 'd': /* --disable */
637
case 'e': /* --enable */
638
case 128: /* --plugin-dir */
639
break;
640
case 129: /* --config-file */
641
free(argfile);
642
argfile = strdup(arg);
643
if(argfile != NULL){
644
errno = 0;
645
}
646
break;
647
case 130: /* --userid */
648
case 131: /* --groupid */
649
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
651
case '?': /* --help */
652
case -3: /* --usage */
653
case 'V': /* --version */
654
case ARGP_KEY_ARG:
655
break;
656
default:
657
return ARGP_ERR_UNKNOWN;
658
}
659
return errno;
660
}
661
662
struct argp argp = { .options = options,
663
.parser = parse_opt_config_file,
664
.args_doc = "",
453
665
.doc = "Mandos plugin runner -- Run plugins" };
454
666
455
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
456
if (ret == ARGP_ERR_UNKNOWN){
457
fprintf(stderr, "Unknown error while parsing arguments\n");
458
exitstatus = EXIT_FAILURE;
459
goto fallback;
460
}
461
462
conffp = fopen(argfile, "r");
667
/* Parse using parse_opt_config_file() in order to get the custom
668
config file location, if any. */
669
ret = argp_parse(&argp, argc, argv,
670
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
671
NULL, NULL);
672
switch(ret){
673
case 0:
674
break;
675
case ENOMEM:
676
default:
677
errno = ret;
678
error(0, errno, "argp_parse");
679
exitstatus = EX_OSERR;
680
goto fallback;
681
case EINVAL:
682
exitstatus = EX_USAGE;
683
goto fallback;
684
}
685
686
/* Reset to the normal argument parser */
687
argp.parser = parse_opt;
688
689
/* Open the configfile if available */
690
if(argfile == NULL){
691
conffp = fopen(AFILE, "r");
692
} else {
693
conffp = fopen(argfile, "r");
694
}
463
695
if(conffp != NULL){
464
696
char *org_line = NULL;
465
697
char *p, *arg, *new_arg, *line;
466
698
size_t size = 0;
467
ssize_t sret;
468
699
const char whitespace_delims[] = " \r\t\f\v\n";
469
700
const char comment_delim[] = "#";
470
701
702
custom_argc = 1;
703
custom_argv = malloc(sizeof(char*) * 2);
704
if(custom_argv == NULL){
705
error(0, errno, "malloc");
706
exitstatus = EX_OSERR;
707
goto fallback;
708
}
709
custom_argv[0] = argv[0];
710
custom_argv[1] = NULL;
711
712
/* for each line in the config file, strip whitespace and ignore
713
commented text */
471
714
while(true){
472
715
sret = getline(&org_line, &size, conffp);
473
716
if(sret == -1){
474
717
break;
475
718
}
476
719
477
720
line = org_line;
478
721
arg = strsep(&line, comment_delim);
479
722
while((p = strsep(&arg, whitespace_delims)) != NULL){
481
724
continue;
482
725
}
483
726
new_arg = strdup(p);
484
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
485
if (custom_argv == NULL){
486
perror("add_to_argv");
487
exitstatus = EXIT_FAILURE;
727
if(new_arg == NULL){
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
730
free(org_line);
488
731
goto fallback;
489
732
}
733
734
custom_argc += 1;
735
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv,
738
(size_t)custom_argc + 1,
739
sizeof(char *));
740
#else
741
char **new_argv = NULL;
742
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
743
/* overflow */
744
errno = ENOMEM;
745
} else {
746
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
747
* sizeof(char *));
748
}
749
#endif
750
if(new_argv == NULL){
751
error(0, errno, "reallocarray");
752
exitstatus = EX_OSERR;
753
free(new_arg);
754
free(org_line);
755
goto fallback;
756
} else {
757
custom_argv = new_argv;
758
}
759
}
760
custom_argv[custom_argc-1] = new_arg;
761
custom_argv[custom_argc] = NULL;
490
762
}
491
763
}
764
do {
765
ret = fclose(conffp);
766
} while(ret == EOF and errno == EINTR);
767
if(ret == EOF){
768
error(0, errno, "fclose");
769
exitstatus = EX_IOERR;
770
goto fallback;
771
}
492
772
free(org_line);
493
} else{
773
} else {
494
774
/* Check for harmful errors and go to fallback. Other errors might
495
775
not affect opening plugins */
496
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
497
perror("fopen");
498
exitstatus = EXIT_FAILURE;
776
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
777
error(0, errno, "fopen");
778
exitstatus = EX_OSERR;
499
779
goto fallback;
500
780
}
501
781
}
502
782
/* If there were any arguments from the configuration file, pass
783
them to parser as command line arguments */
503
784
if(custom_argv != NULL){
504
custom_argv[0] = argv[0];
505
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
506
if (ret == ARGP_ERR_UNKNOWN){
507
fprintf(stderr, "Unknown error while parsing arguments\n");
508
exitstatus = EXIT_FAILURE;
509
goto fallback;
785
ret = argp_parse(&argp, custom_argc, custom_argv,
786
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
787
NULL, NULL);
788
switch(ret){
789
case 0:
790
break;
791
case ENOMEM:
792
default:
793
errno = ret;
794
error(0, errno, "argp_parse");
795
exitstatus = EX_OSERR;
796
goto fallback;
797
case EINVAL:
798
exitstatus = EX_CONFIG;
799
goto fallback;
800
}
801
}
802
803
/* Parse actual command line arguments, to let them override the
804
config file */
805
ret = argp_parse(&argp, argc, argv,
806
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
807
NULL, NULL);
808
switch(ret){
809
case 0:
810
break;
811
case ENOMEM:
812
default:
813
errno = ret;
814
error(0, errno, "argp_parse");
815
exitstatus = EX_OSERR;
816
goto fallback;
817
case EINVAL:
818
exitstatus = EX_USAGE;
819
goto fallback;
820
}
821
822
{
823
char *pluginhelperenv;
824
bool bret = true;
825
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
826
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
827
if(ret != -1){
828
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
829
}
830
if(ret == -1 or not bret){
831
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
832
" environment variable to \"%s\" for all plugins\n",
833
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
834
}
835
if(ret != -1){
836
free(pluginhelperenv);
510
837
}
511
838
}
512
839
513
840
if(debug){
514
for(plugin *p = plugin_list; p != NULL; p=p->next){
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
515
842
fprintf(stderr, "Plugin: %s has %d arguments\n",
516
843
p->name ? p->name : "Global", p->argc - 1);
517
844
for(char **a = p->argv; *a != NULL; a++){
518
845
fprintf(stderr, "\tArg: %s\n", *a);
519
846
}
520
fprintf(stderr, "...and %u environment variables\n", p->envc);
847
fprintf(stderr, "...and %d environment variables\n", p->envc);
521
848
for(char **a = p->environ; *a != NULL; a++){
522
849
fprintf(stderr, "\t%s\n", *a);
523
850
}
524
851
}
525
852
}
526
853
854
if(getuid() == 0){
855
/* Work around Debian bug #633582:
856
<https://bugs.debian.org/633582> */
857
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
858
if(plugindir_fd == -1){
859
if(errno != ENOENT){
860
error(0, errno, "open(\"" PDIR "\")");
861
}
862
} else {
863
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
864
if(ret == -1){
865
error(0, errno, "fstat");
866
} else {
867
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
868
ret = fchown(plugindir_fd, uid, gid);
869
if(ret == -1){
870
error(0, errno, "fchown");
871
}
872
}
873
}
874
close(plugindir_fd);
875
}
876
877
/* Work around Debian bug #981302
878
<https://bugs.debian.org/981302> */
879
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
880
ret = symlink("/proc/self/fd", "/dev/fd");
881
if(ret == -1){
882
error(0, errno, "Failed to create /dev/fd symlink");
883
}
884
}
885
}
886
887
/* Lower permissions */
888
ret = setgid(gid);
889
if(ret == -1){
890
error(0, errno, "setgid");
891
}
527
892
ret = setuid(uid);
528
if (ret == -1){
529
perror("setuid");
530
}
531
532
setgid(gid);
533
if (ret == -1){
534
perror("setgid");
535
}
536
537
dir = opendir(plugindir);
538
if(dir == NULL){
539
perror("Could not open plugin dir");
540
exitstatus = EXIT_FAILURE;
541
goto fallback;
542
}
543
544
/* Set the FD_CLOEXEC flag on the directory, if possible */
893
if(ret == -1){
894
error(0, errno, "setuid");
895
}
896
897
/* Open plugin directory with close_on_exec flag */
545
898
{
546
int dir_fd = dirfd(dir);
547
if(dir_fd >= 0){
548
ret = set_cloexec_flag(dir_fd);
549
if(ret < 0){
550
perror("set_cloexec_flag");
551
exitstatus = EXIT_FAILURE;
552
goto fallback;
899
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
900
#ifdef O_CLOEXEC
901
O_CLOEXEC
902
#else /* not O_CLOEXEC */
903
0
904
#endif /* not O_CLOEXEC */
905
);
906
if(dir_fd == -1){
907
error(0, errno, "Could not open plugin dir");
908
exitstatus = EX_UNAVAILABLE;
909
goto fallback;
910
}
911
912
#ifndef O_CLOEXEC
913
/* Set the FD_CLOEXEC flag on the directory */
914
ret = set_cloexec_flag(dir_fd);
915
if(ret < 0){
916
error(0, errno, "set_cloexec_flag");
917
exitstatus = EX_OSERR;
918
goto fallback;
919
}
920
#endif /* O_CLOEXEC */
921
}
922
923
int good_name(const struct dirent * const dirent){
924
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
925
"*.dpkg-old", "*.dpkg-bak",
926
"*.dpkg-divert", NULL };
927
#ifdef __GNUC__
928
#pragma GCC diagnostic push
929
#pragma GCC diagnostic ignored "-Wcast-qual"
930
#endif
931
for(const char **pat = (const char **)patterns;
932
*pat != NULL; pat++){
933
#ifdef __GNUC__
934
#pragma GCC diagnostic pop
935
#endif
936
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
937
!= FNM_NOMATCH){
938
if(debug){
939
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
940
" matching pattern %s\n", dirent->d_name, *pat);
941
}
942
return 0;
553
943
}
554
944
}
945
return 1;
946
}
947
948
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
949
alphasort);
950
if(numplugins == -1){
951
error(0, errno, "Could not scan plugin dir");
952
direntries = NULL;
953
exitstatus = EX_OSERR;
954
goto fallback;
555
955
}
556
956
557
957
FD_ZERO(&rfds_all);
558
958
559
while(true){
560
dirst = readdir(dir);
561
562
// All directory entries have been processed
563
if(dirst == NULL){
564
if (errno == EBADF){
565
perror("readdir");
566
exitstatus = EXIT_FAILURE;
567
goto fallback;
568
}
569
break;
570
}
571
572
d_name_len = strlen(dirst->d_name);
573
574
// Ignore dotfiles, backup files and other junk
575
{
576
bool bad_name = false;
577
578
const char const *bad_prefixes[] = { ".", "#", NULL };
579
580
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
581
".dpkg-old",
582
".dpkg-divert", NULL };
583
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
584
size_t pre_len = strlen(*pre);
585
if((d_name_len >= pre_len)
586
and strncmp((dirst->d_name), *pre, pre_len) == 0){
587
if(debug){
588
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
589
" with bad prefix %s\n", dirst->d_name, *pre);
590
}
591
bad_name = true;
592
break;
593
}
594
}
595
596
if(bad_name){
597
continue;
598
}
599
600
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
601
size_t suf_len = strlen(*suf);
602
if((d_name_len >= suf_len)
603
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
604
== 0)){
605
if(debug){
606
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
607
" with bad suffix %s\n", dirst->d_name, *suf);
608
}
609
bad_name = true;
610
break;
611
}
612
}
613
614
if(bad_name){
615
continue;
616
}
617
}
618
619
char *filename;
620
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
621
if(ret < 0){
622
perror("asprintf");
623
continue;
624
}
625
626
ret = stat(filename, &st);
627
if (ret == -1){
628
perror("stat");
629
free(filename);
630
continue;
631
}
632
633
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
959
/* Read and execute any executable in the plugin directory*/
960
for(int i = 0; i < numplugins; i++){
961
962
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
963
if(plugin_fd == -1){
964
error(0, errno, "Could not open plugin");
965
free(direntries[i]);
966
continue;
967
}
968
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
969
if(ret == -1){
970
error(0, errno, "stat");
971
close(plugin_fd);
972
free(direntries[i]);
973
continue;
974
}
975
976
/* Ignore non-executable files */
977
if(not S_ISREG(st.st_mode)
978
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
979
X_OK, 0)) != 0)){
634
980
if(debug){
635
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
636
" with bad type or mode\n", filename);
981
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
982
" with bad type or mode\n",
983
plugindir != NULL ? plugindir : PDIR,
984
direntries[i]->d_name);
637
985
}
638
free(filename);
986
close(plugin_fd);
987
free(direntries[i]);
639
988
continue;
640
989
}
641
plugin *p = getplugin(dirst->d_name, &plugin_list);
990
991
plugin *p = getplugin(direntries[i]->d_name);
642
992
if(p == NULL){
643
perror("getplugin");
644
free(filename);
993
error(0, errno, "getplugin");
994
close(plugin_fd);
995
free(direntries[i]);
645
996
continue;
646
997
}
647
998
if(p->disabled){
648
999
if(debug){
649
1000
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
650
dirst->d_name);
1001
direntries[i]->d_name);
651
1002
}
652
free(filename);
1003
close(plugin_fd);
1004
free(direntries[i]);
653
1005
continue;
654
1006
}
655
1007
{
656
1008
/* Add global arguments to argument list for this plugin */
657
plugin *g = getplugin(NULL, &plugin_list);
1009
plugin *g = getplugin(NULL);
658
1010
if(g != NULL){
659
1011
for(char **a = g->argv + 1; *a != NULL; a++){
660
1012
if(not add_argument(p, *a)){
661
perror("add_argument");
1013
error(0, errno, "add_argument");
662
1014
}
663
1015
}
664
1016
/* Add global environment variables */
665
1017
for(char **e = g->environ; *e != NULL; e++){
666
if(not add_environment(p, *e)){
667
perror("add_environment");
1018
if(not add_environment(p, *e, false)){
1019
error(0, errno, "add_environment");
668
1020
}
669
1021
}
670
1022
}
671
1023
}
672
/* If this plugin has any environment variables, we will call
673
using execve and need to duplicate the environment from this
674
process, too. */
1024
/* If this plugin has any environment variables, we need to
1025
duplicate the environment from this process, too. */
675
1026
if(p->environ[0] != NULL){
676
1027
for(char **e = environ; *e != NULL; e++){
677
char *copy = strdup(*e);
678
if(copy == NULL){
679
perror("strdup");
680
continue;
681
}
682
if(not add_environment(p, copy)){
683
perror("add_environment");
1028
if(not add_environment(p, *e, false)){
1029
error(0, errno, "add_environment");
684
1030
}
685
1031
}
686
1032
}
687
1033
688
int pipefd[2];
689
ret = pipe(pipefd);
690
if (ret == -1){
691
perror("pipe");
692
exitstatus = EXIT_FAILURE;
693
goto fallback;
694
}
1034
int pipefd[2];
1035
#ifndef O_CLOEXEC
1036
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1037
#else /* O_CLOEXEC */
1038
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1039
#endif /* O_CLOEXEC */
1040
if(ret == -1){
1041
error(0, errno, "pipe");
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
1044
goto fallback;
1045
}
1046
if(pipefd[0] >= FD_SETSIZE){
1047
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1048
FD_SETSIZE);
1049
close(pipefd[0]);
1050
close(pipefd[1]);
1051
exitstatus = EX_OSERR;
1052
free(direntries[i]);
1053
goto fallback;
1054
}
1055
#ifndef O_CLOEXEC
1056
/* Ask OS to automatic close the pipe on exec */
695
1057
ret = set_cloexec_flag(pipefd[0]);
696
1058
if(ret < 0){
697
perror("set_cloexec_flag");
698
exitstatus = EXIT_FAILURE;
1059
error(0, errno, "set_cloexec_flag");
1060
close(pipefd[0]);
1061
close(pipefd[1]);
1062
exitstatus = EX_OSERR;
1063
free(direntries[i]);
699
1064
goto fallback;
700
1065
}
701
1066
ret = set_cloexec_flag(pipefd[1]);
702
1067
if(ret < 0){
703
perror("set_cloexec_flag");
704
exitstatus = EXIT_FAILURE;
1068
error(0, errno, "set_cloexec_flag");
1069
close(pipefd[0]);
1070
close(pipefd[1]);
1071
exitstatus = EX_OSERR;
1072
free(direntries[i]);
705
1073
goto fallback;
706
1074
}
1075
#endif /* not O_CLOEXEC */
707
1076
/* Block SIGCHLD until process is safely in process list */
708
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1077
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1078
&sigchld_action.sa_mask,
1079
NULL));
709
1080
if(ret < 0){
710
perror("sigprocmask");
711
exitstatus = EXIT_FAILURE;
1081
error(0, errno, "sigprocmask");
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
712
1084
goto fallback;
713
1085
}
714
// Starting a new process to be watched
715
pid_t pid = fork();
1086
/* Starting a new process to be watched */
1087
pid_t pid;
1088
do {
1089
pid = fork();
1090
} while(pid == -1 and errno == EINTR);
716
1091
if(pid == -1){
717
perror("fork");
718
exitstatus = EXIT_FAILURE;
1092
error(0, errno, "fork");
1093
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1094
&sigchld_action.sa_mask, NULL));
1095
close(pipefd[0]);
1096
close(pipefd[1]);
1097
exitstatus = EX_OSERR;
1098
free(direntries[i]);
719
1099
goto fallback;
720
1100
}
721
1101
if(pid == 0){
722
1102
/* this is the child process */
723
1103
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
724
1104
if(ret < 0){
725
perror("sigaction");
726
_exit(EXIT_FAILURE);
1105
error(0, errno, "sigaction");
1106
_exit(EX_OSERR);
727
1107
}
728
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1108
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
729
1109
if(ret < 0){
730
perror("sigprocmask");
731
_exit(EXIT_FAILURE);
1110
error(0, errno, "sigprocmask");
1111
_exit(EX_OSERR);
732
1112
}
733
1113
734
1114
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
735
1115
if(ret == -1){
736
perror("dup2");
737
_exit(EXIT_FAILURE);
1116
error(0, errno, "dup2");
1117
_exit(EX_OSERR);
738
1118
}
739
1119
740
if(dirfd(dir) < 0){
741
/* If dir has no file descriptor, we could not set FD_CLOEXEC
742
above and must now close it manually here. */
743
closedir(dir);
744
}
745
if(p->environ[0] == NULL){
746
if(execv(filename, p->argv) < 0){
747
perror("execv");
748
_exit(EXIT_FAILURE);
749
}
750
} else {
751
if(execve(filename, p->argv, p->environ) < 0){
752
perror("execve");
753
_exit(EXIT_FAILURE);
754
}
1120
if(fexecve(plugin_fd, p->argv,
1121
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1122
error(0, errno, "fexecve for %s/%s",
1123
plugindir != NULL ? plugindir : PDIR,
1124
direntries[i]->d_name);
1125
_exit(EX_OSERR);
755
1126
}
756
1127
/* no return */
757
1128
}
758
/* parent process */
759
free(filename);
760
close(pipefd[1]); /* close unused write end of pipe */
761
process *new_process = malloc(sizeof(process));
762
if (new_process == NULL){
763
perror("malloc");
764
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1129
/* Parent process */
1130
close(pipefd[1]); /* Close unused write end of pipe */
1131
close(plugin_fd);
1132
plugin *new_plugin = getplugin(direntries[i]->d_name);
1133
if(new_plugin == NULL){
1134
error(0, errno, "getplugin");
1135
ret = (int)(TEMP_FAILURE_RETRY
1136
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1137
NULL)));
765
1138
if(ret < 0){
766
perror("sigprocmask");
1139
error(0, errno, "sigprocmask");
767
1140
}
768
exitstatus = EXIT_FAILURE;
1141
exitstatus = EX_OSERR;
1142
free(direntries[i]);
769
1143
goto fallback;
770
1144
}
1145
free(direntries[i]);
771
1146
772
*new_process = (struct process){ .pid = pid,
773
.fd = pipefd[0],
774
.next = process_list };
775
// List handling
776
process_list = new_process;
1147
new_plugin->pid = pid;
1148
new_plugin->fd = pipefd[0];
1149
1150
if(debug){
1151
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1152
new_plugin->name, (intmax_t) (new_plugin->pid));
1153
}
1154
777
1155
/* Unblock SIGCHLD so signal handler can be run if this process
778
1156
has already completed */
779
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1157
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1158
&sigchld_action.sa_mask,
1159
NULL));
780
1160
if(ret < 0){
781
perror("sigprocmask");
782
exitstatus = EXIT_FAILURE;
1161
error(0, errno, "sigprocmask");
1162
exitstatus = EX_OSERR;
783
1163
goto fallback;
784
1164
}
785
1165
786
FD_SET(new_process->fd, &rfds_all);
787
788
if (maxfd < new_process->fd){
789
maxfd = new_process->fd;
790
}
791
792
}
793
794
free_plugin_list(plugin_list);
795
796
closedir(dir);
797
dir = NULL;
798
799
if (process_list == NULL){
800
fprintf(stderr, "No plugin processes started. Incorrect plugin"
801
" directory?\n");
802
process_list = NULL;
803
}
804
while(process_list){
1166
FD_SET(new_plugin->fd, &rfds_all);
1167
1168
if(maxfd < new_plugin->fd){
1169
maxfd = new_plugin->fd;
1170
}
1171
}
1172
1173
free(direntries);
1174
direntries = NULL;
1175
close(dir_fd);
1176
dir_fd = -1;
1177
free_plugin(getplugin(NULL));
1178
1179
for(plugin *p = plugin_list; p != NULL; p = p->next){
1180
if(p->pid != 0){
1181
break;
1182
}
1183
if(p->next == NULL){
1184
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1185
" directory?\n");
1186
free_plugin_list();
1187
}
1188
}
1189
1190
/* Main loop while running plugins exist */
1191
while(plugin_list){
805
1192
fd_set rfds = rfds_all;
806
1193
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
807
if (select_ret == -1){
808
perror("select");
809
exitstatus = EXIT_FAILURE;
1194
if(select_ret == -1 and errno != EINTR){
1195
error(0, errno, "select");
1196
exitstatus = EX_OSERR;
810
1197
goto fallback;
811
1198
}
812
1199
/* OK, now either a process completed, or something can be read
813
1200
from one of them */
814
for(process *proc = process_list; proc ; proc = proc->next){
1201
for(plugin *proc = plugin_list; proc != NULL;){
815
1202
/* Is this process completely done? */
816
if(proc->eof and proc->completed){
1203
if(proc->completed and proc->eof){
817
1204
/* Only accept the plugin output if it exited cleanly */
818
1205
if(not WIFEXITED(proc->status)
819
1206
or WEXITSTATUS(proc->status) != 0){
820
1207
/* Bad exit by plugin */
1208
821
1209
if(debug){
822
1210
if(WIFEXITED(proc->status)){
823
fprintf(stderr, "Plugin %u exited with status %d\n",
824
(unsigned int) (proc->pid),
1211
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1212
" status %d\n", proc->name,
1213
(intmax_t) (proc->pid),
825
1214
WEXITSTATUS(proc->status));
826
} else if(WIFSIGNALED(proc->status)) {
827
fprintf(stderr, "Plugin %u killed by signal %d\n",
828
(unsigned int) (proc->pid),
829
WTERMSIG(proc->status));
830
} else if(WCOREDUMP(proc->status)){
831
fprintf(stderr, "Plugin %d dumped core\n",
832
(unsigned int) (proc->pid));
1215
} else if(WIFSIGNALED(proc->status)){
1216
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1217
" signal %d: %s\n", proc->name,
1218
(intmax_t) (proc->pid),
1219
WTERMSIG(proc->status),
1220
strsignal(WTERMSIG(proc->status)));
833
1221
}
834
1222
}
1223
835
1224
/* Remove the plugin */
836
1225
FD_CLR(proc->fd, &rfds_all);
1226
837
1227
/* Block signal while modifying process_list */
838
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1228
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1229
(SIG_BLOCK,
1230
&sigchld_action.sa_mask,
1231
NULL));
839
1232
if(ret < 0){
840
perror("sigprocmask");
841
exitstatus = EXIT_FAILURE;
1233
error(0, errno, "sigprocmask");
1234
exitstatus = EX_OSERR;
842
1235
goto fallback;
843
1236
}
844
/* Delete this process entry from the list */
845
if(process_list == proc){
846
/* First one - simple */
847
process_list = proc->next;
848
} else {
849
/* Second one or later */
850
for(process *p = process_list; p != NULL; p = p->next){
851
if(p->next == proc){
852
p->next = proc->next;
853
break;
854
}
855
}
856
}
1237
1238
plugin *next_plugin = proc->next;
1239
free_plugin(proc);
1240
proc = next_plugin;
1241
857
1242
/* We are done modifying process list, so unblock signal */
858
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
859
NULL);
1243
ret = (int)(TEMP_FAILURE_RETRY
1244
(sigprocmask(SIG_UNBLOCK,
1245
&sigchld_action.sa_mask, NULL)));
860
1246
if(ret < 0){
861
perror("sigprocmask");
862
}
863
free(proc->buffer);
864
free(proc);
865
/* We deleted this process from the list, so we can't go
866
proc->next. Therefore, start over from the beginning of
867
the process list */
868
break;
1247
error(0, errno, "sigprocmask");
1248
exitstatus = EX_OSERR;
1249
goto fallback;
1250
}
1251
1252
if(plugin_list == NULL){
1253
break;
1254
}
1255
1256
continue;
869
1257
}
1258
870
1259
/* This process exited nicely, so print its buffer */
871
872
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1260
1261
bool bret = print_out_password(proc->buffer,
1262
proc->buffer_length);
873
1263
if(not bret){
874
perror("print_out_password");
875
exitstatus = EXIT_FAILURE;
1264
error(0, errno, "print_out_password");
1265
exitstatus = EX_IOERR;
876
1266
}
877
1267
goto fallback;
878
1268
}
1269
879
1270
/* This process has not completed. Does it have any output? */
880
1271
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
881
1272
/* This process had nothing to say at this time */
1273
proc = proc->next;
882
1274
continue;
883
1275
}
884
1276
/* Before reading, make the process' data buffer large enough */
885
1277
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
886
proc->buffer = realloc(proc->buffer, proc->buffer_size
887
+ (size_t) BUFFER_SIZE);
888
if (proc->buffer == NULL){
889
perror("malloc");
890
exitstatus = EXIT_FAILURE;
1278
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1279
+ (size_t) BUFFER_SIZE);
1280
if(new_buffer == NULL){
1281
error(0, errno, "malloc");
1282
exitstatus = EX_OSERR;
891
1283
goto fallback;
892
1284
}
1285
proc->buffer = new_buffer;
893
1286
proc->buffer_size += BUFFER_SIZE;
894
1287
}
895
1288
/* Read from the process */
896
ret = read(proc->fd, proc->buffer + proc->buffer_length,
897
BUFFER_SIZE);
898
if(ret < 0){
1289
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1290
proc->buffer
1291
+ proc->buffer_length,
1292
BUFFER_SIZE));
1293
if(sret < 0){
899
1294
/* Read error from this process; ignore the error */
1295
proc = proc->next;
900
1296
continue;
901
1297
}
902
if(ret == 0){
1298
if(sret == 0){
903
1299
/* got EOF */
904
1300
proc->eof = true;
905
1301
} else {
906
proc->buffer_length += (size_t) ret;
1302
proc->buffer_length += (size_t) sret;
907
1303
}
908
1304
}
909
1305
}
910
911
1306
1307
912
1308
fallback:
913
1309
914
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
915
/* Fallback if all plugins failed, none are found or an error occured */
1310
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1311
and exitstatus != EX_OK)){
1312
/* Fallback if all plugins failed, none are found or an error
1313
occured */
916
1314
bool bret;
917
1315
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
918
1316
char *passwordbuffer = getpass("Password: ");
919
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1317
size_t len = strlen(passwordbuffer);
1318
/* Strip trailing newline */
1319
if(len > 0 and passwordbuffer[len-1] == '\n'){
1320
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1321
len--;
1322
}
1323
bret = print_out_password(passwordbuffer, len);
920
1324
if(not bret){
921
perror("print_out_password");
922
exitstatus = EXIT_FAILURE;
1325
error(0, errno, "print_out_password");
1326
exitstatus = EX_IOERR;
923
1327
}
924
1328
}
925
1329
926
1330
/* Restore old signal handler */
927
1331
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
928
1332
if(ret == -1){
929
perror("sigaction");
930
exitstatus = EXIT_FAILURE;
1333
error(0, errno, "sigaction");
1334
exitstatus = EX_OSERR;
931
1335
}
932
1336
933
1337
if(custom_argv != NULL){
934
for(char **arg = custom_argv; *arg != NULL; arg++){
1338
for(char **arg = custom_argv+1; *arg != NULL; arg++){
935
1339
free(*arg);
936
1340
}
937
1341
free(custom_argv);
938
1342
}
939
free_plugin_list(plugin_list);
940
941
if(dir != NULL){
942
closedir(dir);
1343
1344
free(direntries);
1345
1346
if(dir_fd != -1){
1347
close(dir_fd);
943
1348
}
944
1349
945
/* Free the process list and kill the processes */
946
for(process *next; process_list != NULL; process_list = next){
947
next = process_list->next;
948
close(process_list->fd);
949
ret = kill(process_list->pid, SIGTERM);
950
if(ret == -1 and errno != ESRCH){
951
/* set-uid proccesses migth not get closed */
952
perror("kill");
1350
/* Kill the processes */
1351
for(plugin *p = plugin_list; p != NULL; p = p->next){
1352
if(p->pid != 0){
1353
close(p->fd);
1354
ret = kill(p->pid, SIGTERM);
1355
if(ret == -1 and errno != ESRCH){
1356
/* Set-uid proccesses might not get closed */
1357
error(0, errno, "kill");
1358
}
953
1359
}
954
free(process_list->buffer);
955
free(process_list);
956
1360
}
957
1361
958
1362
/* Wait for any remaining child processes to terminate */
959
do{
1363
do {
960
1364
ret = wait(NULL);
961
1365
} while(ret >= 0);
962
1366
if(errno != ECHILD){
963
perror("wait");
1367
error(0, errno, "wait");
964
1368
}
965
1369
1370
free_plugin_list();
1371
1372
free(plugindir);
1373
free(pluginhelperdir);
1374
free(argfile);
1375
966
1376
return exitstatus;
967
1377
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0