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- Committer: Teddy Hogeborn
- Date: 2024-09-09 04:24:39 UTC
- Revision ID: teddy@recompile.se-20240909042439-j85mr20uli2hnyis
Eliminate compiler warnings
Many programs use nested functions, which now result in a linker
warning about executable stack. Hide this warning. Also, rewrite a
loop in the plymouth plugin to avoid warning about signed overflow.
This change also makes the plugin pick the alphabetically first
process entry instead of the last, in case many plymouth processes are
found (which should be unlikely).
* Makefile (plugin-runner, dracut-module/password-agent,
plugins.d/password-prompt, plugins.d/mandos-client,
plugins.d/plymouth): New target; set LDFLAGS to add "-Xlinker
--no-warn-execstack".
* plugins.d/plymouth.c (get_pid): When no pid files are found, and we
are looking through the process list, go though it from the start
instead of from the end, i.e. in normal alphabetical order and not
in reverse order.
Many programs use nested functions, which now result in a linker
warning about executable stack. Hide this warning. Also, rewrite a
loop in the plymouth plugin to avoid warning about signed overflow.
This change also makes the plugin pick the alphabetically first
process entry instead of the last, in case many plymouth processes are
found (which should be unlikely).
* Makefile (plugin-runner, dracut-module/password-agent,
plugins.d/password-prompt, plugins.d/mandos-client,
plugins.d/plymouth): New target; set LDFLAGS to add "-Xlinker
--no-warn-execstack".
* plugins.d/plymouth.c (get_pid): When no pid files are found, and we
are looking through the process list, go though it from the start
instead of from the end, i.e. in normal alphabetical order and not
in reverse order.
- 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:
- .bzrignore
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,
60
error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#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 */
66
89
67
90
#define BUFFER_SIZE 256
68
91
69
92
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
70
94
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
95
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
96
const char *argp_program_version = "plugin-runner " VERSION;
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
98
77
99
typedef struct plugin{
78
100
char *name; /* can be NULL or any plugin name */
81
103
char **environ;
82
104
int envc;
83
105
bool disabled;
84
106
85
107
/* Variables used for running processes*/
86
108
pid_t pid;
87
109
int fd;
89
111
size_t buffer_size;
90
112
size_t buffer_length;
91
113
bool eof;
92
volatile bool completed;
93
volatile int status;
114
volatile sig_atomic_t completed;
115
int status;
94
116
struct plugin *next;
95
117
} plugin;
96
118
97
119
static plugin *plugin_list = NULL;
98
120
99
/* Gets a existing plugin based on name,
121
/* Gets an existing plugin based on name,
100
122
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
101
124
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
106
129
return p;
107
130
}
108
131
}
109
132
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
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){
112
138
return NULL;
113
139
}
114
140
char *copy_name = NULL;
115
141
if(name != NULL){
116
copy_name = strdup(name);
142
do {
143
copy_name = strdup(name);
144
} while(copy_name == NULL and errno == EINTR);
117
145
if(copy_name == NULL){
146
int e = errno;
147
free(new_plugin);
148
errno = e;
118
149
return NULL;
119
150
}
120
151
}
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
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;
129
163
free(copy_name);
130
164
free(new_plugin);
165
errno = e;
131
166
return NULL;
132
167
}
133
168
new_plugin->argv[0] = copy_name;
134
169
new_plugin->argv[1] = NULL;
135
170
136
new_plugin->environ = malloc(sizeof(char *));
171
do {
172
new_plugin->environ = malloc(sizeof(char *));
173
} while(new_plugin->environ == NULL and errno == EINTR);
137
174
if(new_plugin->environ == NULL){
175
int e = errno;
138
176
free(copy_name);
139
177
free(new_plugin->argv);
140
178
free(new_plugin);
179
errno = e;
141
180
return NULL;
142
181
}
143
182
new_plugin->environ[0] = NULL;
148
187
}
149
188
150
189
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
151
191
static bool add_to_char_array(const char *new, char ***array,
152
192
int *len){
153
193
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (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);
156
210
/* Malloc check */
157
if(*array == NULL){
211
if(new_array == NULL){
158
212
return false;
159
213
}
214
*array = new_array;
160
215
/* Make a copy of the new string */
161
char *copy = strdup(new);
216
char *copy;
217
do {
218
copy = strdup(new);
219
} while(copy == NULL and errno == EINTR);
162
220
if(copy == NULL){
163
221
return false;
164
222
}
171
229
}
172
230
173
231
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
174
233
static bool add_argument(plugin *p, const char *arg){
175
234
if(p == NULL){
176
235
return false;
179
238
}
180
239
181
240
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
182
242
static bool add_environment(plugin *p, const char *def, bool replace){
183
243
if(p == NULL){
184
244
return false;
186
246
/* namelen = length of name of environment variable */
187
247
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
248
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
191
251
/* It already exists */
192
252
if(replace){
193
char *new = realloc(*e, strlen(def));
194
if(new == NULL){
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){
195
258
return false;
196
259
}
197
*e = new;
198
strcpy(*e, def);
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
199
262
}
200
263
return true;
201
264
}
203
266
return add_to_char_array(def, &(p->environ), &(p->envc));
204
267
}
205
268
269
#ifndef O_CLOEXEC
206
270
/*
207
271
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
272
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
274
*/
211
static int set_cloexec_flag(int fd)
212
{
213
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));
214
278
/* If reading the flags failed, return error indication now. */
215
279
if(ret < 0){
216
280
return ret;
217
281
}
218
282
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
ret | FD_CLOEXEC));
220
285
}
286
#endif /* not O_CLOEXEC */
221
287
222
288
223
289
/* Mark processes as completed when they exit, and save their exit
224
290
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
291
static void handle_sigchld(__attribute__((unused)) int sig){
292
int old_errno = errno;
226
293
while(true){
227
294
plugin *proc = plugin_list;
228
295
int status;
232
299
break;
233
300
}
234
301
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
302
if(errno == ECHILD){
303
/* No child processes */
304
break;
237
305
}
238
/* No child processes */
239
break;
306
error(0, errno, "waitpid");
240
307
}
241
308
242
309
/* A child exited, find it in process_list */
243
310
while(proc != NULL and proc->pid != pid){
244
311
proc = proc->next;
248
315
continue;
249
316
}
250
317
proc->status = status;
251
proc->completed = true;
318
proc->completed = 1;
252
319
}
320
errno = old_errno;
253
321
}
254
322
255
323
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
324
__attribute__((nonnull, warn_unused_result))
325
static bool print_out_password(const char *buffer, size_t length){
257
326
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
261
327
for(size_t written = 0; written < length; written += (size_t)ret){
262
328
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
329
length - written));
269
335
}
270
336
271
337
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
272
339
static void free_plugin(plugin *plugin_node){
273
340
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
275
342
free(*arg);
276
343
}
344
free(plugin_node->name);
277
345
free(plugin_node->argv);
278
346
for(char **env = plugin_node->environ; *env != NULL; env++){
279
347
free(*env);
280
348
}
281
349
free(plugin_node->environ);
282
350
free(plugin_node->buffer);
283
351
284
352
/* Removes the plugin from the singly-linked list */
285
353
if(plugin_node == plugin_list){
286
354
/* First one - simple */
306
374
307
375
int main(int argc, char *argv[]){
308
376
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
309
378
char *argfile = NULL;
310
379
FILE *conffp;
311
size_t d_name_len;
312
DIR *dir = NULL;
313
struct dirent *dirst;
380
struct dirent **direntries = NULL;
314
381
struct stat st;
315
382
fd_set rfds_all;
316
383
int ret, maxfd = 0;
384
ssize_t sret;
317
385
uid_t uid = 65534;
318
386
gid_t gid = 65534;
319
387
bool debug = false;
323
391
.sa_flags = SA_NOCLDSTOP };
324
392
char **custom_argv = NULL;
325
393
int custom_argc = 0;
394
int dir_fd = -1;
326
395
327
396
/* Establish a signal handler */
328
397
sigemptyset(&sigchld_action.sa_mask);
329
398
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
330
399
if(ret == -1){
331
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
400
error(0, errno, "sigaddset");
401
exitstatus = EX_OSERR;
333
402
goto fallback;
334
403
}
335
404
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
336
405
if(ret == -1){
337
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
406
error(0, errno, "sigaction");
407
exitstatus = EX_OSERR;
339
408
goto fallback;
340
409
}
341
410
344
413
{ .name = "global-options", .key = 'g',
345
414
.arg = "OPTION[,OPTION[,...]]",
346
415
.doc = "Options passed to all plugins" },
347
{ .name = "global-env", .key = 'e',
416
{ .name = "global-env", .key = 'G',
348
417
.arg = "VAR=value",
349
418
.doc = "Environment variable passed to all plugins" },
350
419
{ .name = "options-for", .key = 'o',
351
420
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
352
421
.doc = "Options passed only to specified plugin" },
353
{ .name = "env-for", .key = 'f',
422
{ .name = "env-for", .key = 'E',
354
423
.arg = "PLUGIN:ENV=value",
355
424
.doc = "Environment variable passed to specified plugin" },
356
425
{ .name = "disable", .key = 'd',
357
426
.arg = "PLUGIN",
358
427
.doc = "Disable a specific plugin", .group = 1 },
428
{ .name = "enable", .key = 'e',
429
.arg = "PLUGIN",
430
.doc = "Enable a specific plugin", .group = 1 },
359
431
{ .name = "plugin-dir", .key = 128,
360
432
.arg = "DIRECTORY",
361
433
.doc = "Specify a different plugin directory", .group = 2 },
370
442
.doc = "Group ID the plugins will run as", .group = 3 },
371
443
{ .name = "debug", .key = 132,
372
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 },
373
458
{ .name = NULL }
374
459
};
375
460
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
/* Get the INPUT argument from `argp_parse', which we know is a
379
pointer to our plugin list pointer. */
380
switch (key) {
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;
381
467
case 'g': /* --global-options */
382
if (arg != NULL){
383
char *p;
384
while((p = strsep(&arg, ",")) != NULL){
385
if(p[0] == '\0'){
386
continue;
387
}
388
if(not add_argument(getplugin(NULL), p)){
389
perror("add_argument");
390
return ARGP_ERR_UNKNOWN;
391
}
392
}
393
}
394
break;
395
case 'e': /* --global-env */
396
if(arg == NULL){
397
break;
398
}
399
468
{
400
char *envdef = strdup(arg);
401
if(envdef == NULL){
402
break;
403
}
404
if(not add_environment(getplugin(NULL), envdef, true)){
405
perror("add_environment");
406
}
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;
407
481
}
408
482
break;
409
483
case 'o': /* --options-for */
410
if (arg != NULL){
411
char *p_name = strsep(&arg, ":");
412
if(p_name[0] == '\0'){
413
break;
414
}
415
char *opt = strsep(&arg, ":");
416
if(opt[0] == '\0'){
417
break;
418
}
419
if(opt != NULL){
420
char *p;
421
while((p = strsep(&opt, ",")) != NULL){
422
if(p[0] == '\0'){
423
continue;
424
}
425
if(not add_argument(getplugin(p_name), p)){
426
perror("add_argument");
427
return ARGP_ERR_UNKNOWN;
428
}
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;
429
502
}
430
503
}
504
errno = 0;
431
505
}
432
506
break;
433
case 'f': /* --env-for */
434
if(arg == NULL){
435
break;
436
}
507
case 'E': /* --env-for */
437
508
{
438
509
char *envdef = strchr(arg, ':');
439
510
if(envdef == NULL){
440
break;
441
}
442
char *p_name = strndup(arg, (size_t) (envdef-arg));
443
if(p_name == NULL){
444
break;
445
}
511
argp_error(state, "No colon in \"%s\"", arg);
512
errno = EINVAL;
513
break;
514
}
515
*envdef = '\0';
446
516
envdef++;
447
if(not add_environment(getplugin(p_name), envdef, true)){
448
perror("add_environment");
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;
449
524
}
450
525
}
451
526
break;
452
527
case 'd': /* --disable */
453
if (arg != NULL){
454
plugin *p = getplugin(arg);
455
if(p == NULL){
456
return ARGP_ERR_UNKNOWN;
457
}
458
p->disabled = true;
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
}
459
543
}
460
544
break;
461
545
case 128: /* --plugin-dir */
546
free(plugindir);
462
547
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
466
break;
467
case 129: /* --config-file */
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 */
578
debug = true;
579
break;
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);
468
642
argfile = strdup(arg);
469
if(argfile == NULL){
470
perror("strdup");
643
if(argfile != NULL){
644
errno = 0;
471
645
}
472
break;
646
break;
473
647
case 130: /* --userid */
474
uid = (uid_t)strtol(arg, NULL, 10);
475
break;
476
648
case 131: /* --groupid */
477
gid = (gid_t)strtol(arg, NULL, 10);
478
break;
479
649
case 132: /* --debug */
480
debug = true;
481
break;
650
case 133: /* --plugin-helper-dir */
651
case '?': /* --help */
652
case -3: /* --usage */
653
case 'V': /* --version */
482
654
case ARGP_KEY_ARG:
483
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
484
break;
485
case ARGP_KEY_END:
486
655
break;
487
656
default:
488
657
return ARGP_ERR_UNKNOWN;
489
658
}
490
return 0;
659
return errno;
491
660
}
492
661
493
struct argp argp = { .options = options, .parser = parse_opt,
662
struct argp argp = { .options = options,
663
.parser = parse_opt_config_file,
494
664
.args_doc = "",
495
665
.doc = "Mandos plugin runner -- Run plugins" };
496
666
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
497
689
/* Open the configfile if available */
498
if (argfile == NULL){
690
if(argfile == NULL){
499
691
conffp = fopen(AFILE, "r");
500
692
} else {
501
693
conffp = fopen(argfile, "r");
502
}
694
}
503
695
if(conffp != NULL){
504
696
char *org_line = NULL;
505
697
char *p, *arg, *new_arg, *line;
506
698
size_t size = 0;
507
ssize_t sret;
508
699
const char whitespace_delims[] = " \r\t\f\v\n";
509
700
const char comment_delim[] = "#";
510
701
511
702
custom_argc = 1;
512
703
custom_argv = malloc(sizeof(char*) * 2);
513
704
if(custom_argv == NULL){
514
perror("malloc");
515
exitstatus = EXIT_FAILURE;
705
error(0, errno, "malloc");
706
exitstatus = EX_OSERR;
516
707
goto fallback;
517
708
}
518
709
custom_argv[0] = argv[0];
519
710
custom_argv[1] = NULL;
520
711
521
712
/* for each line in the config file, strip whitespace and ignore
522
713
commented text */
523
714
while(true){
525
716
if(sret == -1){
526
717
break;
527
718
}
528
719
529
720
line = org_line;
530
721
arg = strsep(&line, comment_delim);
531
722
while((p = strsep(&arg, whitespace_delims)) != NULL){
534
725
}
535
726
new_arg = strdup(p);
536
727
if(new_arg == NULL){
537
perror("strdup");
538
exitstatus = EXIT_FAILURE;
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
539
730
free(org_line);
540
731
goto fallback;
541
732
}
542
733
543
734
custom_argc += 1;
544
custom_argv = realloc(custom_argv, sizeof(char *)
545
* ((unsigned int) custom_argc + 1));
546
if(custom_argv == NULL){
547
perror("realloc");
548
exitstatus = EXIT_FAILURE;
549
free(org_line);
550
goto fallback;
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
}
551
759
}
552
760
custom_argv[custom_argc-1] = new_arg;
553
custom_argv[custom_argc] = NULL;
761
custom_argv[custom_argc] = NULL;
554
762
}
555
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
}
556
772
free(org_line);
557
773
} else {
558
774
/* Check for harmful errors and go to fallback. Other errors might
559
775
not affect opening plugins */
560
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
561
perror("fopen");
562
exitstatus = EXIT_FAILURE;
776
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
777
error(0, errno, "fopen");
778
exitstatus = EX_OSERR;
563
779
goto fallback;
564
780
}
565
781
}
566
/* If there was any arguments from configuration file,
567
pass them to parser as command arguments */
782
/* If there were any arguments from the configuration file, pass
783
them to parser as command line arguments */
568
784
if(custom_argv != NULL){
569
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
570
0, NULL);
571
if (ret == ARGP_ERR_UNKNOWN){
572
fprintf(stderr, "Unknown error while parsing arguments\n");
573
exitstatus = EXIT_FAILURE;
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;
574
799
goto fallback;
575
800
}
576
801
}
577
802
578
803
/* Parse actual command line arguments, to let them override the
579
804
config file */
580
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
581
if (ret == ARGP_ERR_UNKNOWN){
582
fprintf(stderr, "Unknown error while parsing arguments\n");
583
exitstatus = EXIT_FAILURE;
584
goto fallback;
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);
837
}
585
838
}
586
839
587
840
if(debug){
588
for(plugin *p = plugin_list; p != NULL; p=p->next){
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
589
842
fprintf(stderr, "Plugin: %s has %d arguments\n",
590
843
p->name ? p->name : "Global", p->argc - 1);
591
844
for(char **a = p->argv; *a != NULL; a++){
592
845
fprintf(stderr, "\tArg: %s\n", *a);
593
846
}
594
fprintf(stderr, "...and %u environment variables\n", p->envc);
847
fprintf(stderr, "...and %d environment variables\n", p->envc);
595
848
for(char **a = p->environ; *a != NULL; a++){
596
849
fprintf(stderr, "\t%s\n", *a);
597
850
}
598
851
}
599
852
}
600
853
601
/* Strip permissions down to nobody */
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
}
602
892
ret = setuid(uid);
603
if (ret == -1){
604
perror("setuid");
605
}
606
setgid(gid);
607
if (ret == -1){
608
perror("setgid");
609
}
610
611
if (plugindir == NULL){
612
dir = opendir(PDIR);
613
} else {
614
dir = opendir(plugindir);
615
}
616
617
if(dir == NULL){
618
perror("Could not open plugin dir");
619
exitstatus = EXIT_FAILURE;
620
goto fallback;
621
}
622
623
/* 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 */
624
898
{
625
int dir_fd = dirfd(dir);
626
if(dir_fd >= 0){
627
ret = set_cloexec_flag(dir_fd);
628
if(ret < 0){
629
perror("set_cloexec_flag");
630
exitstatus = EXIT_FAILURE;
631
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;
632
943
}
633
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;
634
955
}
635
956
636
957
FD_ZERO(&rfds_all);
637
958
638
959
/* Read and execute any executable in the plugin directory*/
639
while(true){
640
dirst = readdir(dir);
641
642
/* All directory entries have been processed */
643
if(dirst == NULL){
644
if (errno == EBADF){
645
perror("readdir");
646
exitstatus = EXIT_FAILURE;
647
goto fallback;
648
}
649
break;
650
}
651
652
d_name_len = strlen(dirst->d_name);
653
654
/* Ignore dotfiles, backup files and other junk */
655
{
656
bool bad_name = false;
657
658
const char const *bad_prefixes[] = { ".", "#", NULL };
659
660
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
661
".dpkg-old",
662
".dpkg-divert", NULL };
663
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
664
size_t pre_len = strlen(*pre);
665
if((d_name_len >= pre_len)
666
and strncmp((dirst->d_name), *pre, pre_len) == 0){
667
if(debug){
668
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
669
" with bad prefix %s\n", dirst->d_name, *pre);
670
}
671
bad_name = true;
672
break;
673
}
674
}
675
if(bad_name){
676
continue;
677
}
678
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
679
size_t suf_len = strlen(*suf);
680
if((d_name_len >= suf_len)
681
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
682
== 0)){
683
if(debug){
684
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
685
" with bad suffix %s\n", dirst->d_name, *suf);
686
}
687
bad_name = true;
688
break;
689
}
690
}
691
692
if(bad_name){
693
continue;
694
}
695
}
696
697
char *filename;
698
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
699
if(ret < 0){
700
perror("asprintf");
701
continue;
702
}
703
704
ret = stat(filename, &st);
705
if (ret == -1){
706
perror("stat");
707
free(filename);
708
continue;
709
}
710
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
711
976
/* Ignore non-executable files */
712
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
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)){
713
980
if(debug){
714
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
715
" 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);
716
985
}
717
free(filename);
986
close(plugin_fd);
987
free(direntries[i]);
718
988
continue;
719
989
}
720
990
721
plugin *p = getplugin(dirst->d_name);
991
plugin *p = getplugin(direntries[i]->d_name);
722
992
if(p == NULL){
723
perror("getplugin");
724
free(filename);
993
error(0, errno, "getplugin");
994
close(plugin_fd);
995
free(direntries[i]);
725
996
continue;
726
997
}
727
998
if(p->disabled){
728
999
if(debug){
729
1000
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
730
dirst->d_name);
1001
direntries[i]->d_name);
731
1002
}
732
free(filename);
1003
close(plugin_fd);
1004
free(direntries[i]);
733
1005
continue;
734
1006
}
735
1007
{
738
1010
if(g != NULL){
739
1011
for(char **a = g->argv + 1; *a != NULL; a++){
740
1012
if(not add_argument(p, *a)){
741
perror("add_argument");
1013
error(0, errno, "add_argument");
742
1014
}
743
1015
}
744
1016
/* Add global environment variables */
745
1017
for(char **e = g->environ; *e != NULL; e++){
746
1018
if(not add_environment(p, *e, false)){
747
perror("add_environment");
1019
error(0, errno, "add_environment");
748
1020
}
749
1021
}
750
1022
}
751
1023
}
752
/* If this plugin has any environment variables, we will call
753
using execve and need to duplicate the environment from this
754
process, too. */
1024
/* If this plugin has any environment variables, we need to
1025
duplicate the environment from this process, too. */
755
1026
if(p->environ[0] != NULL){
756
1027
for(char **e = environ; *e != NULL; e++){
757
1028
if(not add_environment(p, *e, false)){
758
perror("add_environment");
1029
error(0, errno, "add_environment");
759
1030
}
760
1031
}
761
1032
}
762
1033
763
1034
int pipefd[2];
764
ret = pipe(pipefd);
765
if (ret == -1){
766
perror("pipe");
767
exitstatus = EXIT_FAILURE;
768
goto fallback;
769
}
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
770
1056
/* Ask OS to automatic close the pipe on exec */
771
1057
ret = set_cloexec_flag(pipefd[0]);
772
1058
if(ret < 0){
773
perror("set_cloexec_flag");
774
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]);
775
1064
goto fallback;
776
1065
}
777
1066
ret = set_cloexec_flag(pipefd[1]);
778
1067
if(ret < 0){
779
perror("set_cloexec_flag");
780
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]);
781
1073
goto fallback;
782
1074
}
1075
#endif /* not O_CLOEXEC */
783
1076
/* Block SIGCHLD until process is safely in process list */
784
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));
785
1080
if(ret < 0){
786
perror("sigprocmask");
787
exitstatus = EXIT_FAILURE;
1081
error(0, errno, "sigprocmask");
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
788
1084
goto fallback;
789
1085
}
790
1086
/* Starting a new process to be watched */
791
pid_t pid = fork();
1087
pid_t pid;
1088
do {
1089
pid = fork();
1090
} while(pid == -1 and errno == EINTR);
792
1091
if(pid == -1){
793
perror("fork");
794
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]);
795
1099
goto fallback;
796
1100
}
797
1101
if(pid == 0){
798
1102
/* this is the child process */
799
1103
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
800
1104
if(ret < 0){
801
perror("sigaction");
802
_exit(EXIT_FAILURE);
1105
error(0, errno, "sigaction");
1106
_exit(EX_OSERR);
803
1107
}
804
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1108
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
805
1109
if(ret < 0){
806
perror("sigprocmask");
807
_exit(EXIT_FAILURE);
1110
error(0, errno, "sigprocmask");
1111
_exit(EX_OSERR);
808
1112
}
809
1113
810
1114
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
811
1115
if(ret == -1){
812
perror("dup2");
813
_exit(EXIT_FAILURE);
1116
error(0, errno, "dup2");
1117
_exit(EX_OSERR);
814
1118
}
815
1119
816
if(dirfd(dir) < 0){
817
/* If dir has no file descriptor, we could not set FD_CLOEXEC
818
above and must now close it manually here. */
819
closedir(dir);
820
}
821
if(p->environ[0] == NULL){
822
if(execv(filename, p->argv) < 0){
823
perror("execv");
824
_exit(EXIT_FAILURE);
825
}
826
} else {
827
if(execve(filename, p->argv, p->environ) < 0){
828
perror("execve");
829
_exit(EXIT_FAILURE);
830
}
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);
831
1126
}
832
1127
/* no return */
833
1128
}
834
1129
/* Parent process */
835
1130
close(pipefd[1]); /* Close unused write end of pipe */
836
free(filename);
837
plugin *new_plugin = getplugin(dirst->d_name);
838
if (new_plugin == NULL){
839
perror("getplugin");
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
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)));
841
1138
if(ret < 0){
842
perror("sigprocmask");
1139
error(0, errno, "sigprocmask");
843
1140
}
844
exitstatus = EXIT_FAILURE;
1141
exitstatus = EX_OSERR;
1142
free(direntries[i]);
845
1143
goto fallback;
846
1144
}
1145
free(direntries[i]);
847
1146
848
1147
new_plugin->pid = pid;
849
1148
new_plugin->fd = pipefd[0];
850
1149
1150
if(debug){
1151
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1152
new_plugin->name, (intmax_t) (new_plugin->pid));
1153
}
1154
851
1155
/* Unblock SIGCHLD so signal handler can be run if this process
852
1156
has already completed */
853
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));
854
1160
if(ret < 0){
855
perror("sigprocmask");
856
exitstatus = EXIT_FAILURE;
1161
error(0, errno, "sigprocmask");
1162
exitstatus = EX_OSERR;
857
1163
goto fallback;
858
1164
}
859
1165
860
1166
FD_SET(new_plugin->fd, &rfds_all);
861
1167
862
if (maxfd < new_plugin->fd){
1168
if(maxfd < new_plugin->fd){
863
1169
maxfd = new_plugin->fd;
864
1170
}
865
866
1171
}
867
1172
868
closedir(dir);
869
dir = NULL;
870
1173
free(direntries);
1174
direntries = NULL;
1175
close(dir_fd);
1176
dir_fd = -1;
1177
free_plugin(getplugin(NULL));
1178
871
1179
for(plugin *p = plugin_list; p != NULL; p = p->next){
872
1180
if(p->pid != 0){
873
1181
break;
878
1186
free_plugin_list();
879
1187
}
880
1188
}
881
1189
882
1190
/* Main loop while running plugins exist */
883
1191
while(plugin_list){
884
1192
fd_set rfds = rfds_all;
885
1193
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
886
if (select_ret == -1){
887
perror("select");
888
exitstatus = EXIT_FAILURE;
1194
if(select_ret == -1 and errno != EINTR){
1195
error(0, errno, "select");
1196
exitstatus = EX_OSERR;
889
1197
goto fallback;
890
1198
}
891
1199
/* OK, now either a process completed, or something can be read
892
1200
from one of them */
893
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1201
for(plugin *proc = plugin_list; proc != NULL;){
894
1202
/* Is this process completely done? */
895
if(proc->eof and proc->completed){
1203
if(proc->completed and proc->eof){
896
1204
/* Only accept the plugin output if it exited cleanly */
897
1205
if(not WIFEXITED(proc->status)
898
1206
or WEXITSTATUS(proc->status) != 0){
899
1207
/* Bad exit by plugin */
900
1208
901
1209
if(debug){
902
1210
if(WIFEXITED(proc->status)){
903
fprintf(stderr, "Plugin %u exited with status %d\n",
904
(unsigned int) (proc->pid),
1211
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1212
" status %d\n", proc->name,
1213
(intmax_t) (proc->pid),
905
1214
WEXITSTATUS(proc->status));
906
} else if(WIFSIGNALED(proc->status)) {
907
fprintf(stderr, "Plugin %u killed by signal %d\n",
908
(unsigned int) (proc->pid),
909
WTERMSIG(proc->status));
910
} else if(WCOREDUMP(proc->status)){
911
fprintf(stderr, "Plugin %d dumped core\n",
912
(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)));
913
1221
}
914
1222
}
915
1223
916
1224
/* Remove the plugin */
917
1225
FD_CLR(proc->fd, &rfds_all);
918
1226
919
1227
/* Block signal while modifying process_list */
920
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));
921
1232
if(ret < 0){
922
perror("sigprocmask");
923
exitstatus = EXIT_FAILURE;
1233
error(0, errno, "sigprocmask");
1234
exitstatus = EX_OSERR;
924
1235
goto fallback;
925
1236
}
1237
1238
plugin *next_plugin = proc->next;
926
1239
free_plugin(proc);
1240
proc = next_plugin;
1241
927
1242
/* We are done modifying process list, so unblock signal */
928
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
929
NULL);
1243
ret = (int)(TEMP_FAILURE_RETRY
1244
(sigprocmask(SIG_UNBLOCK,
1245
&sigchld_action.sa_mask, NULL)));
930
1246
if(ret < 0){
931
perror("sigprocmask");
932
exitstatus = EXIT_FAILURE;
1247
error(0, errno, "sigprocmask");
1248
exitstatus = EX_OSERR;
933
1249
goto fallback;
934
1250
}
935
1251
936
1252
if(plugin_list == NULL){
937
1253
break;
938
1254
}
1255
939
1256
continue;
940
1257
}
941
1258
942
1259
/* This process exited nicely, so print its buffer */
943
1260
944
1261
bool bret = print_out_password(proc->buffer,
945
1262
proc->buffer_length);
946
1263
if(not bret){
947
perror("print_out_password");
948
exitstatus = EXIT_FAILURE;
1264
error(0, errno, "print_out_password");
1265
exitstatus = EX_IOERR;
949
1266
}
950
1267
goto fallback;
951
1268
}
953
1270
/* This process has not completed. Does it have any output? */
954
1271
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
955
1272
/* This process had nothing to say at this time */
1273
proc = proc->next;
956
1274
continue;
957
1275
}
958
1276
/* Before reading, make the process' data buffer large enough */
959
1277
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
960
proc->buffer = realloc(proc->buffer, proc->buffer_size
961
+ (size_t) BUFFER_SIZE);
962
if (proc->buffer == NULL){
963
perror("malloc");
964
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;
965
1283
goto fallback;
966
1284
}
1285
proc->buffer = new_buffer;
967
1286
proc->buffer_size += BUFFER_SIZE;
968
1287
}
969
1288
/* Read from the process */
970
ret = read(proc->fd, proc->buffer + proc->buffer_length,
971
BUFFER_SIZE);
972
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){
973
1294
/* Read error from this process; ignore the error */
1295
proc = proc->next;
974
1296
continue;
975
1297
}
976
if(ret == 0){
1298
if(sret == 0){
977
1299
/* got EOF */
978
1300
proc->eof = true;
979
1301
} else {
980
proc->buffer_length += (size_t) ret;
1302
proc->buffer_length += (size_t) sret;
981
1303
}
982
1304
}
983
1305
}
984
985
1306
1307
986
1308
fallback:
987
1309
988
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1310
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1311
and exitstatus != EX_OK)){
989
1312
/* Fallback if all plugins failed, none are found or an error
990
1313
occured */
991
1314
bool bret;
992
1315
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
993
1316
char *passwordbuffer = getpass("Password: ");
994
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);
995
1324
if(not bret){
996
perror("print_out_password");
997
exitstatus = EXIT_FAILURE;
1325
error(0, errno, "print_out_password");
1326
exitstatus = EX_IOERR;
998
1327
}
999
1328
}
1000
1329
1001
1330
/* Restore old signal handler */
1002
1331
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1003
1332
if(ret == -1){
1004
perror("sigaction");
1005
exitstatus = EXIT_FAILURE;
1333
error(0, errno, "sigaction");
1334
exitstatus = EX_OSERR;
1006
1335
}
1007
1336
1008
1337
if(custom_argv != NULL){
1009
1338
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1010
1339
free(*arg);
1012
1341
free(custom_argv);
1013
1342
}
1014
1343
1015
if(dir != NULL){
1016
closedir(dir);
1344
free(direntries);
1345
1346
if(dir_fd != -1){
1347
close(dir_fd);
1017
1348
}
1018
1349
1019
/* Free the process list and kill the processes */
1350
/* Kill the processes */
1020
1351
for(plugin *p = plugin_list; p != NULL; p = p->next){
1021
1352
if(p->pid != 0){
1022
1353
close(p->fd);
1023
1354
ret = kill(p->pid, SIGTERM);
1024
1355
if(ret == -1 and errno != ESRCH){
1025
1356
/* Set-uid proccesses might not get closed */
1026
perror("kill");
1357
error(0, errno, "kill");
1027
1358
}
1028
1359
}
1029
1360
}
1030
1361
1031
1362
/* Wait for any remaining child processes to terminate */
1032
do{
1363
do {
1033
1364
ret = wait(NULL);
1034
1365
} while(ret >= 0);
1035
1366
if(errno != ECHILD){
1036
perror("wait");
1367
error(0, errno, "wait");
1037
1368
}
1038
1369
1039
1370
free_plugin_list();
1040
1371
1041
1372
free(plugindir);
1373
free(pluginhelperdir);
1042
1374
free(argfile);
1043
1375
1044
1376
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0