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- Committer: Teddy Hogeborn
- Date: 2011-10-08 21:13:46 UTC
- mfrom: (510 trunk)
- mto: (505.2.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 511.
- Revision ID: teddy@recompile.se-20111008211346-z1r0xsk8ak8b04wf
* debian/source/local-options: New; contains "--single-debian-patch".
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files removed:
- network-protocol.txt
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
20
21
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
asprintf(), O_CLOEXEC */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
35
36
uid_t, gid_t, getuid(), getgid(),
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
46
readdir(), closedir(), dirfd() */
45
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
48
fcntl(), setuid(), setgid(),
47
49
F_GETFD, F_SETFD, FD_CLOEXEC,
48
50
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
51
dup2(), STDOUT_FILENO, _exit(),
50
52
execv(), write(), read(),
51
53
close() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
55
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
58
61
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
60
64
#include <signal.h> /* struct sigaction, sigemptyset(),
61
65
sigaddset(), sigaction(),
62
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
63
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
65
75
66
76
#define BUFFER_SIZE 256
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
77
78
#define PDIR "/lib/mandos/plugins.d"
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
85
83
86
84
typedef struct plugin{
87
85
char *name; /* can be NULL or any plugin name */
90
88
char **environ;
91
89
int envc;
92
90
bool disabled;
91
92
/* Variables used for running processes*/
93
pid_t pid;
94
int fd;
95
char *buffer;
96
size_t buffer_size;
97
size_t buffer_length;
98
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
93
101
struct plugin *next;
94
102
} plugin;
95
103
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
if ((p->name == name)
99
or (p->name and name and (strcmp(p->name, name) == 0))){
104
static plugin *plugin_list = NULL;
105
106
/* Gets an existing plugin based on name,
107
or if none is found, creates a new one */
108
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
if((p->name == name)
112
or (p->name and name and (strcmp(p->name, name) == 0))){
100
113
return p;
101
114
}
102
115
}
103
116
/* Create a new plugin */
104
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
106
122
return NULL;
107
123
}
108
*new_plugin = (plugin) { .name = name,
109
.argc = 1,
110
.envc = 0,
111
.disabled = false,
112
.next = *plugin_list };
113
114
new_plugin->argv = malloc(sizeof(char *) * 2);
115
if (new_plugin->argv == NULL){
124
char *copy_name = NULL;
125
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
129
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
133
return NULL;
134
}
135
}
136
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
141
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
145
if(new_plugin->argv == NULL){
146
int e = errno;
147
free(copy_name);
116
148
free(new_plugin);
149
errno = e;
117
150
return NULL;
118
151
}
119
new_plugin->argv[0] = name;
152
new_plugin->argv[0] = copy_name;
120
153
new_plugin->argv[1] = NULL;
121
122
new_plugin->environ = malloc(sizeof(char *));
154
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
123
158
if(new_plugin->environ == NULL){
159
int e = errno;
160
free(copy_name);
124
161
free(new_plugin->argv);
125
162
free(new_plugin);
163
errno = e;
126
164
return NULL;
127
165
}
128
166
new_plugin->environ[0] = NULL;
167
129
168
/* Append the new plugin to the list */
130
*plugin_list = new_plugin;
169
plugin_list = new_plugin;
131
170
return new_plugin;
132
171
}
133
172
135
174
static bool add_to_char_array(const char *new, char ***array,
136
175
int *len){
137
176
/* Resize the pointed-to array to hold one more pointer */
138
*array = realloc(*array, sizeof(char *)
139
* (size_t) ((*len) + 2));
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
140
181
/* Malloc check */
141
182
if(*array == NULL){
142
183
return false;
143
184
}
144
185
/* Make a copy of the new string */
145
char *copy = strdup(new);
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
146
190
if(copy == NULL){
147
191
return false;
148
192
}
163
207
}
164
208
165
209
/* Add to a plugin's environment */
166
static bool add_environment(plugin *p, const char *def){
210
static bool add_environment(plugin *p, const char *def, bool replace){
167
211
if(p == NULL){
168
212
return false;
169
213
}
214
/* namelen = length of name of environment variable */
215
size_t namelen = (size_t)(strchrnul(def, '=') - def);
216
/* Search for this environment variable */
217
for(char **e = p->environ; *e != NULL; e++){
218
if(strncmp(*e, def, namelen + 1) == 0){
219
/* It already exists */
220
if(replace){
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
225
if(new == NULL){
226
return false;
227
}
228
*e = new;
229
strcpy(*e, def);
230
}
231
return true;
232
}
233
}
170
234
return add_to_char_array(def, &(p->environ), &(p->envc));
171
235
}
172
236
173
174
237
/*
175
238
* Based on the example in the GNU LibC manual chapter 13.13 "File
176
239
* Descriptor Flags".
177
* *Note File Descriptor Flags:(libc)Descriptor Flags.
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
178
241
*/
179
static int set_cloexec_flag(int fd)
180
{
181
int ret = fcntl(fd, F_GETFD, 0);
242
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
182
244
/* If reading the flags failed, return error indication now. */
183
245
if(ret < 0){
184
246
return ret;
185
247
}
186
248
/* Store modified flag word in the descriptor. */
187
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
188
251
}
189
252
190
process *process_list = NULL;
191
253
192
/* Mark a process as completed when it exits, and save its exit
254
/* Mark processes as completed when they exit, and save their exit
193
255
status. */
194
void handle_sigchld(__attribute__((unused)) int sig){
195
process *proc = process_list;
196
int status;
197
pid_t pid = wait(&status);
198
if(pid == -1){
199
perror("wait");
200
return;
201
}
202
while(proc != NULL and proc->pid != pid){
203
proc = proc->next;
204
}
205
if(proc == NULL){
206
/* Process not found in process list */
207
return;
208
}
209
proc->status = status;
210
proc->completed = true;
256
static void handle_sigchld(__attribute__((unused)) int sig){
257
int old_errno = errno;
258
while(true){
259
plugin *proc = plugin_list;
260
int status;
261
pid_t pid = waitpid(-1, &status, WNOHANG);
262
if(pid == 0){
263
/* Only still running child processes */
264
break;
265
}
266
if(pid == -1){
267
if(errno == ECHILD){
268
/* No child processes */
269
break;
270
}
271
error(0, errno, "waitpid");
272
}
273
274
/* A child exited, find it in process_list */
275
while(proc != NULL and proc->pid != pid){
276
proc = proc->next;
277
}
278
if(proc == NULL){
279
/* Process not found in process list */
280
continue;
281
}
282
proc->status = status;
283
proc->completed = 1;
284
}
285
errno = old_errno;
211
286
}
212
287
213
bool print_out_password(const char *buffer, size_t length){
288
/* Prints out a password to stdout */
289
static bool print_out_password(const char *buffer, size_t length){
214
290
ssize_t ret;
215
if(length>0 and buffer[length-1] == '\n'){
216
length--;
217
}
218
291
for(size_t written = 0; written < length; written += (size_t)ret){
219
292
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
220
293
length - written));
225
298
return true;
226
299
}
227
300
228
char **add_to_argv(char **argv, int *argc, char *arg){
229
if (argv == NULL){
230
*argc = 1;
231
argv = malloc(sizeof(char*) * 2);
232
if(argv == NULL){
233
return NULL;
301
/* Removes and free a plugin from the plugin list */
302
static void free_plugin(plugin *plugin_node){
303
304
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
305
free(*arg);
306
}
307
free(plugin_node->argv);
308
for(char **env = plugin_node->environ; *env != NULL; env++){
309
free(*env);
310
}
311
free(plugin_node->environ);
312
free(plugin_node->buffer);
313
314
/* Removes the plugin from the singly-linked list */
315
if(plugin_node == plugin_list){
316
/* First one - simple */
317
plugin_list = plugin_list->next;
318
} else {
319
/* Second one or later */
320
for(plugin *p = plugin_list; p != NULL; p = p->next){
321
if(p->next == plugin_node){
322
p->next = plugin_node->next;
323
break;
324
}
234
325
}
235
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
236
argv[1] = NULL;
237
}
238
*argc += 1;
239
argv = realloc(argv, sizeof(char *)
240
* ((unsigned int) *argc + 1));
241
if(argv == NULL){
242
return NULL;
243
}
244
argv[*argc-1] = arg;
245
argv[*argc] = NULL;
246
return argv;
326
}
327
328
free(plugin_node);
329
}
330
331
static void free_plugin_list(void){
332
while(plugin_list != NULL){
333
free_plugin(plugin_list);
334
}
247
335
}
248
336
249
337
int main(int argc, char *argv[]){
250
const char *plugindir = "/lib/mandos/plugins.d";
251
const char *argfile = ARGFILE;
338
char *plugindir = NULL;
339
char *argfile = NULL;
252
340
FILE *conffp;
253
341
size_t d_name_len;
254
342
DIR *dir = NULL;
256
344
struct stat st;
257
345
fd_set rfds_all;
258
346
int ret, maxfd = 0;
347
ssize_t sret;
259
348
uid_t uid = 65534;
260
349
gid_t gid = 65534;
261
350
bool debug = false;
269
358
/* Establish a signal handler */
270
359
sigemptyset(&sigchld_action.sa_mask);
271
360
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
272
if(ret < 0){
273
perror("sigaddset");
274
exit(EXIT_FAILURE);
361
if(ret == -1){
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
364
goto fallback;
275
365
}
276
366
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
277
if(ret < 0){
278
perror("sigaction");
279
exit(EXIT_FAILURE);
367
if(ret == -1){
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
370
goto fallback;
280
371
}
281
372
282
373
/* The options we understand. */
284
375
{ .name = "global-options", .key = 'g',
285
376
.arg = "OPTION[,OPTION[,...]]",
286
377
.doc = "Options passed to all plugins" },
287
{ .name = "global-envs", .key = 'e',
378
{ .name = "global-env", .key = 'G',
288
379
.arg = "VAR=value",
289
380
.doc = "Environment variable passed to all plugins" },
290
381
{ .name = "options-for", .key = 'o',
291
382
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
292
383
.doc = "Options passed only to specified plugin" },
293
{ .name = "envs-for", .key = 'f',
384
{ .name = "env-for", .key = 'E',
294
385
.arg = "PLUGIN:ENV=value",
295
386
.doc = "Environment variable passed to specified plugin" },
296
387
{ .name = "disable", .key = 'd',
297
388
.arg = "PLUGIN",
298
389
.doc = "Disable a specific plugin", .group = 1 },
390
{ .name = "enable", .key = 'e',
391
.arg = "PLUGIN",
392
.doc = "Enable a specific plugin", .group = 1 },
299
393
{ .name = "plugin-dir", .key = 128,
300
394
.arg = "DIRECTORY",
301
395
.doc = "Specify a different plugin directory", .group = 2 },
302
{ .name = "userid", .key = 129,
303
.arg = "ID", .flags = 0,
304
.doc = "User ID the plugins will run as", .group = 2 },
305
{ .name = "groupid", .key = 130,
306
.arg = "ID", .flags = 0,
307
.doc = "Group ID the plugins will run as", .group = 2 },
308
{ .name = "debug", .key = 131,
309
.doc = "Debug mode", .group = 3 },
396
{ .name = "config-file", .key = 129,
397
.arg = "FILE",
398
.doc = "Specify a different configuration file", .group = 2 },
399
{ .name = "userid", .key = 130,
400
.arg = "ID", .flags = 0,
401
.doc = "User ID the plugins will run as", .group = 3 },
402
{ .name = "groupid", .key = 131,
403
.arg = "ID", .flags = 0,
404
.doc = "Group ID the plugins will run as", .group = 3 },
405
{ .name = "debug", .key = 132,
406
.doc = "Debug mode", .group = 4 },
407
/*
408
* These reproduce what we would get without ARGP_NO_HELP
409
*/
410
{ .name = "help", .key = '?',
411
.doc = "Give this help list", .group = -1 },
412
{ .name = "usage", .key = -3,
413
.doc = "Give a short usage message", .group = -1 },
414
{ .name = "version", .key = 'V',
415
.doc = "Print program version", .group = -1 },
310
416
{ .name = NULL }
311
417
};
312
418
313
error_t parse_opt (int key, char *arg, struct argp_state *state) {
314
/* Get the INPUT argument from `argp_parse', which we know is a
315
pointer to our plugin list pointer. */
316
plugin **plugins = state->input;
317
switch (key) {
318
case 'g':
319
if (arg != NULL){
320
char *p;
321
while((p = strsep(&arg, ",")) != NULL){
322
if(p[0] == '\0'){
323
continue;
324
}
325
if(not add_argument(getplugin(NULL, plugins), p)){
326
perror("add_argument");
327
return ARGP_ERR_UNKNOWN;
328
}
329
}
330
}
331
break;
332
case 'e':
333
if(arg == NULL){
334
break;
335
}
336
{
337
char *envdef = strdup(arg);
338
if(envdef == NULL){
339
break;
340
}
341
if(not add_environment(getplugin(NULL, plugins), envdef)){
342
perror("add_environment");
343
}
344
}
345
break;
346
case 'o':
347
if (arg != NULL){
348
char *p_name = strsep(&arg, ":");
349
if(p_name[0] == '\0'){
350
break;
351
}
352
char *opt = strsep(&arg, ":");
353
if(opt[0] == '\0'){
354
break;
355
}
356
if(opt != NULL){
357
char *p;
358
while((p = strsep(&opt, ",")) != NULL){
359
if(p[0] == '\0'){
360
continue;
361
}
362
if(not add_argument(getplugin(p_name, plugins), p)){
363
perror("add_argument");
364
return ARGP_ERR_UNKNOWN;
365
}
366
}
367
}
368
}
369
break;
370
case 'f':
371
if(arg == NULL){
372
break;
373
}
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
421
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
424
case 'g': /* --global-options */
425
{
426
char *plugin_option;
427
while((plugin_option = strsep(&arg, ",")) != NULL){
428
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
430
}
431
}
432
}
433
break;
434
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
436
break;
437
case 'o': /* --options-for */
438
{
439
char *option_list = strchr(arg, ':');
440
if(option_list == NULL){
441
argp_error(state, "No colon in \"%s\"", arg);
442
errno = EINVAL;
443
break;
444
}
445
*option_list = '\0';
446
option_list++;
447
if(arg[0] == '\0'){
448
argp_error(state, "Empty plugin name");
449
errno = EINVAL;
450
break;
451
}
452
char *option;
453
while((option = strsep(&option_list, ",")) != NULL){
454
if(not add_argument(getplugin(arg), option)){
455
break;
456
}
457
}
458
}
459
break;
460
case 'E': /* --env-for */
374
461
{
375
462
char *envdef = strchr(arg, ':');
376
463
if(envdef == NULL){
377
break;
378
}
379
char *p_name = strndup(arg, (size_t) (envdef-arg));
380
if(p_name == NULL){
381
break;
382
}
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
466
break;
467
}
468
*envdef = '\0';
383
469
envdef++;
384
if(not add_environment(getplugin(p_name, plugins), envdef)){
385
perror("add_environment");
386
}
387
}
388
break;
389
case 'd':
390
if (arg != NULL){
391
plugin *p = getplugin(arg, plugins);
392
if(p == NULL){
393
return ARGP_ERR_UNKNOWN;
394
}
395
p->disabled = true;
396
}
397
break;
398
case 128:
399
plugindir = arg;
400
break;
401
case 129:
402
uid = (uid_t)strtol(arg, NULL, 10);
403
break;
404
case 130:
405
gid = (gid_t)strtol(arg, NULL, 10);
406
break;
407
case 131:
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
474
}
475
add_environment(getplugin(arg), envdef, true);
476
}
477
break;
478
case 'd': /* --disable */
479
{
480
plugin *p = getplugin(arg);
481
if(p != NULL){
482
p->disabled = true;
483
}
484
}
485
break;
486
case 'e': /* --enable */
487
{
488
plugin *p = getplugin(arg);
489
if(p != NULL){
490
p->disabled = false;
491
}
492
}
493
break;
494
case 128: /* --plugin-dir */
495
free(plugindir);
496
plugindir = strdup(arg);
497
break;
498
case 129: /* --config-file */
499
/* This is already done by parse_opt_config_file() */
500
break;
501
case 130: /* --userid */
502
tmpmax = strtoimax(arg, &tmp, 10);
503
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
508
}
509
uid = (uid_t)tmpmax;
510
break;
511
case 131: /* --groupid */
512
tmpmax = strtoimax(arg, &tmp, 10);
513
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
518
}
519
gid = (gid_t)tmpmax;
520
break;
521
case 132: /* --debug */
408
522
debug = true;
409
523
break;
410
case ARGP_KEY_ARG:
411
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
412
break;
413
case ARGP_KEY_END:
414
break;
415
default:
416
return ARGP_ERR_UNKNOWN;
417
}
418
return 0;
419
}
420
421
plugin *plugin_list = NULL;
422
423
struct argp argp = { .options = options, .parser = parse_opt,
424
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
524
/*
525
* These reproduce what we would get without ARGP_NO_HELP
526
*/
527
case '?': /* --help */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
530
case -3: /* --usage */
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
argp_state_help(state, state->out_stream,
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
534
case 'V': /* --version */
535
fprintf(state->out_stream, "%s\n", argp_program_version);
536
exit(EXIT_SUCCESS);
537
break;
538
/*
539
* When adding more options before this line, remember to also add a
540
* "case" to the "parse_opt_config_file" function below.
541
*/
542
case ARGP_KEY_ARG:
543
/* Cryptsetup always passes an argument, which is an empty
544
string if "none" was specified in /etc/crypttab. So if
545
argument was empty, we ignore it silently. */
546
if(arg[0] == '\0'){
547
break;
548
}
549
default:
550
return ARGP_ERR_UNKNOWN;
551
}
552
return errno; /* Set to 0 at start */
553
}
554
555
/* This option parser is the same as parse_opt() above, except it
556
ignores everything but the --config-file option. */
557
error_t parse_opt_config_file(int key, char *arg,
558
__attribute__((unused))
559
struct argp_state *state){
560
errno = 0;
561
switch(key){
562
case 'g': /* --global-options */
563
case 'G': /* --global-env */
564
case 'o': /* --options-for */
565
case 'E': /* --env-for */
566
case 'd': /* --disable */
567
case 'e': /* --enable */
568
case 128: /* --plugin-dir */
569
break;
570
case 129: /* --config-file */
571
free(argfile);
572
argfile = strdup(arg);
573
break;
574
case 130: /* --userid */
575
case 131: /* --groupid */
576
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
580
case ARGP_KEY_ARG:
581
break;
582
default:
583
return ARGP_ERR_UNKNOWN;
584
}
585
return errno;
586
}
587
588
struct argp argp = { .options = options,
589
.parser = parse_opt_config_file,
590
.args_doc = "",
425
591
.doc = "Mandos plugin runner -- Run plugins" };
426
592
427
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
428
if (ret == ARGP_ERR_UNKNOWN){
429
fprintf(stderr, "Unknown error while parsing arguments\n");
430
exitstatus = EXIT_FAILURE;
431
goto end;
432
}
433
434
conffp = fopen(argfile, "r");
593
/* Parse using parse_opt_config_file() in order to get the custom
594
config file location, if any. */
595
ret = argp_parse(&argp, argc, argv,
596
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
597
NULL, NULL);
598
switch(ret){
599
case 0:
600
break;
601
case ENOMEM:
602
default:
603
errno = ret;
604
error(0, errno, "argp_parse");
605
exitstatus = EX_OSERR;
606
goto fallback;
607
case EINVAL:
608
exitstatus = EX_USAGE;
609
goto fallback;
610
}
611
612
/* Reset to the normal argument parser */
613
argp.parser = parse_opt;
614
615
/* Open the configfile if available */
616
if(argfile == NULL){
617
conffp = fopen(AFILE, "r");
618
} else {
619
conffp = fopen(argfile, "r");
620
}
435
621
if(conffp != NULL){
436
622
char *org_line = NULL;
623
char *p, *arg, *new_arg, *line;
437
624
size_t size = 0;
438
ssize_t sret;
439
char *p, *arg, *new_arg, *line;
440
625
const char whitespace_delims[] = " \r\t\f\v\n";
441
626
const char comment_delim[] = "#";
442
627
628
custom_argc = 1;
629
custom_argv = malloc(sizeof(char*) * 2);
630
if(custom_argv == NULL){
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
633
goto fallback;
634
}
635
custom_argv[0] = argv[0];
636
custom_argv[1] = NULL;
637
638
/* for each line in the config file, strip whitespace and ignore
639
commented text */
443
640
while(true){
444
641
sret = getline(&org_line, &size, conffp);
445
642
if(sret == -1){
446
643
break;
447
644
}
448
645
449
646
line = org_line;
450
647
arg = strsep(&line, comment_delim);
451
648
while((p = strsep(&arg, whitespace_delims)) != NULL){
453
650
continue;
454
651
}
455
652
new_arg = strdup(p);
456
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
457
if (custom_argv == NULL){
458
perror("add_to_argv");
459
exitstatus = EXIT_FAILURE;
460
goto end;
461
}
653
if(new_arg == NULL){
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
656
free(org_line);
657
goto fallback;
658
}
659
660
custom_argc += 1;
661
custom_argv = realloc(custom_argv, sizeof(char *)
662
* ((unsigned int) custom_argc + 1));
663
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
666
free(org_line);
667
goto fallback;
668
}
669
custom_argv[custom_argc-1] = new_arg;
670
custom_argv[custom_argc] = NULL;
462
671
}
463
672
}
673
do {
674
ret = fclose(conffp);
675
} while(ret == EOF and errno == EINTR);
676
if(ret == EOF){
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
679
goto fallback;
680
}
464
681
free(org_line);
465
} else{
682
} else {
466
683
/* Check for harmful errors and go to fallback. Other errors might
467
684
not affect opening plugins */
468
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
469
perror("fopen");
470
exitstatus = EXIT_FAILURE;
471
goto end;
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
688
goto fallback;
472
689
}
473
690
}
474
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
475
693
if(custom_argv != NULL){
476
custom_argv[0] = argv[0];
477
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
478
if (ret == ARGP_ERR_UNKNOWN){
479
fprintf(stderr, "Unknown error while parsing arguments\n");
480
exitstatus = EXIT_FAILURE;
481
goto end;
694
ret = argp_parse(&argp, custom_argc, custom_argv,
695
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
696
NULL, NULL);
697
switch(ret){
698
case 0:
699
break;
700
case ENOMEM:
701
default:
702
errno = ret;
703
error(0, errno, "argp_parse");
704
exitstatus = EX_OSERR;
705
goto fallback;
706
case EINVAL:
707
exitstatus = EX_CONFIG;
708
goto fallback;
482
709
}
483
710
}
484
711
712
/* Parse actual command line arguments, to let them override the
713
config file */
714
ret = argp_parse(&argp, argc, argv,
715
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
716
NULL, NULL);
717
switch(ret){
718
case 0:
719
break;
720
case ENOMEM:
721
default:
722
errno = ret;
723
error(0, errno, "argp_parse");
724
exitstatus = EX_OSERR;
725
goto fallback;
726
case EINVAL:
727
exitstatus = EX_USAGE;
728
goto fallback;
729
}
730
485
731
if(debug){
486
732
for(plugin *p = plugin_list; p != NULL; p=p->next){
487
733
fprintf(stderr, "Plugin: %s has %d arguments\n",
489
735
for(char **a = p->argv; *a != NULL; a++){
490
736
fprintf(stderr, "\tArg: %s\n", *a);
491
737
}
492
fprintf(stderr, "...and %u environment variables\n", p->envc);
738
fprintf(stderr, "...and %d environment variables\n", p->envc);
493
739
for(char **a = p->environ; *a != NULL; a++){
494
740
fprintf(stderr, "\t%s\n", *a);
495
741
}
496
742
}
497
743
}
498
744
745
{
746
/* Work around Debian bug #633582:
747
<http://bugs.debian.org/633582> */
748
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
749
if(plugindir_fd == -1){
750
error(0, errno, "open");
751
} else {
752
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
753
if(ret == -1){
754
error(0, errno, "fstat");
755
} else {
756
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
757
ret = fchown(plugindir_fd, uid, gid);
758
if(ret == -1){
759
error(0, errno, "fchown");
760
}
761
}
762
}
763
TEMP_FAILURE_RETRY(close(plugindir_fd));
764
}
765
}
766
767
/* Lower permissions */
768
setgid(gid);
769
if(ret == -1){
770
error(0, errno, "setgid");
771
}
499
772
ret = setuid(uid);
500
if (ret == -1){
501
perror("setuid");
502
}
503
504
setgid(gid);
505
if (ret == -1){
506
perror("setgid");
507
}
508
509
dir = opendir(plugindir);
510
if(dir == NULL){
511
perror("Could not open plugin dir");
512
exitstatus = EXIT_FAILURE;
513
goto end;
514
}
515
516
/* Set the FD_CLOEXEC flag on the directory, if possible */
773
if(ret == -1){
774
error(0, errno, "setuid");
775
}
776
777
/* Open plugin directory with close_on_exec flag */
517
778
{
518
int dir_fd = dirfd(dir);
519
if(dir_fd >= 0){
520
ret = set_cloexec_flag(dir_fd);
521
if(ret < 0){
522
perror("set_cloexec_flag");
523
exitstatus = EXIT_FAILURE;
524
goto end;
525
}
779
int dir_fd = -1;
780
if(plugindir == NULL){
781
dir_fd = open(PDIR, O_RDONLY |
782
#ifdef O_CLOEXEC
783
O_CLOEXEC
784
#else /* not O_CLOEXEC */
785
0
786
#endif /* not O_CLOEXEC */
787
);
788
} else {
789
dir_fd = open(plugindir, O_RDONLY |
790
#ifdef O_CLOEXEC
791
O_CLOEXEC
792
#else /* not O_CLOEXEC */
793
0
794
#endif /* not O_CLOEXEC */
795
);
796
}
797
if(dir_fd == -1){
798
error(0, errno, "Could not open plugin dir");
799
exitstatus = EX_UNAVAILABLE;
800
goto fallback;
801
}
802
803
#ifndef O_CLOEXEC
804
/* Set the FD_CLOEXEC flag on the directory */
805
ret = set_cloexec_flag(dir_fd);
806
if(ret < 0){
807
error(0, errno, "set_cloexec_flag");
808
TEMP_FAILURE_RETRY(close(dir_fd));
809
exitstatus = EX_OSERR;
810
goto fallback;
811
}
812
#endif /* O_CLOEXEC */
813
814
dir = fdopendir(dir_fd);
815
if(dir == NULL){
816
error(0, errno, "Could not open plugin dir");
817
TEMP_FAILURE_RETRY(close(dir_fd));
818
exitstatus = EX_OSERR;
819
goto fallback;
526
820
}
527
821
}
528
822
529
823
FD_ZERO(&rfds_all);
530
824
825
/* Read and execute any executable in the plugin directory*/
531
826
while(true){
532
dirst = readdir(dir);
827
do {
828
dirst = readdir(dir);
829
} while(dirst == NULL and errno == EINTR);
533
830
534
// All directory entries have been processed
831
/* All directory entries have been processed */
535
832
if(dirst == NULL){
536
if (errno == EBADF){
537
perror("readdir");
538
exitstatus = EXIT_FAILURE;
539
goto end;
833
if(errno == EBADF){
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
836
goto fallback;
540
837
}
541
838
break;
542
839
}
543
840
544
841
d_name_len = strlen(dirst->d_name);
545
842
546
// Ignore dotfiles, backup files and other junk
843
/* Ignore dotfiles, backup files and other junk */
547
844
{
548
845
bool bad_name = false;
549
846
551
848
552
849
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
553
850
".dpkg-old",
851
".dpkg-bak",
554
852
".dpkg-divert", NULL };
555
853
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
556
854
size_t pre_len = strlen(*pre);
564
862
break;
565
863
}
566
864
}
567
568
865
if(bad_name){
569
866
continue;
570
867
}
571
572
868
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
573
869
size_t suf_len = strlen(*suf);
574
870
if((d_name_len >= suf_len)
575
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
576
872
== 0)){
577
873
if(debug){
578
874
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
587
883
continue;
588
884
}
589
885
}
590
886
591
887
char *filename;
592
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
888
if(plugindir == NULL){
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
890
dirst->d_name));
891
} else {
892
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
893
plugindir,
894
dirst->d_name));
895
}
593
896
if(ret < 0){
594
perror("asprintf");
897
error(0, errno, "asprintf");
595
898
continue;
596
899
}
597
900
598
ret = stat(filename, &st);
599
if (ret == -1){
600
perror("stat");
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
902
if(ret == -1){
903
error(0, errno, "stat");
601
904
free(filename);
602
905
continue;
603
906
}
604
907
605
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
908
/* Ignore non-executable files */
909
if(not S_ISREG(st.st_mode)
910
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
606
911
if(debug){
607
912
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
608
913
" with bad type or mode\n", filename);
610
915
free(filename);
611
916
continue;
612
917
}
613
plugin *p = getplugin(dirst->d_name, &plugin_list);
918
919
plugin *p = getplugin(dirst->d_name);
614
920
if(p == NULL){
615
perror("getplugin");
921
error(0, errno, "getplugin");
616
922
free(filename);
617
923
continue;
618
924
}
626
932
}
627
933
{
628
934
/* Add global arguments to argument list for this plugin */
629
plugin *g = getplugin(NULL, &plugin_list);
935
plugin *g = getplugin(NULL);
630
936
if(g != NULL){
631
937
for(char **a = g->argv + 1; *a != NULL; a++){
632
938
if(not add_argument(p, *a)){
633
perror("add_argument");
939
error(0, errno, "add_argument");
634
940
}
635
941
}
636
942
/* Add global environment variables */
637
943
for(char **e = g->environ; *e != NULL; e++){
638
if(not add_environment(p, *e)){
639
perror("add_environment");
944
if(not add_environment(p, *e, false)){
945
error(0, errno, "add_environment");
640
946
}
641
947
}
642
948
}
646
952
process, too. */
647
953
if(p->environ[0] != NULL){
648
954
for(char **e = environ; *e != NULL; e++){
649
char *copy = strdup(*e);
650
if(copy == NULL){
651
perror("strdup");
652
continue;
653
}
654
if(not add_environment(p, copy)){
655
perror("add_environment");
955
if(not add_environment(p, *e, false)){
956
error(0, errno, "add_environment");
656
957
}
657
958
}
658
959
}
659
960
660
int pipefd[2];
661
ret = pipe(pipefd);
662
if (ret == -1){
663
perror("pipe");
664
exitstatus = EXIT_FAILURE;
665
goto end;
961
int pipefd[2];
962
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
963
if(ret == -1){
964
error(0, errno, "pipe");
965
exitstatus = EX_OSERR;
966
goto fallback;
666
967
}
968
/* Ask OS to automatic close the pipe on exec */
667
969
ret = set_cloexec_flag(pipefd[0]);
668
970
if(ret < 0){
669
perror("set_cloexec_flag");
670
exitstatus = EXIT_FAILURE;
671
goto end;
971
error(0, errno, "set_cloexec_flag");
972
exitstatus = EX_OSERR;
973
goto fallback;
672
974
}
673
975
ret = set_cloexec_flag(pipefd[1]);
674
976
if(ret < 0){
675
perror("set_cloexec_flag");
676
exitstatus = EXIT_FAILURE;
677
goto end;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
979
goto fallback;
678
980
}
679
981
/* Block SIGCHLD until process is safely in process list */
680
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
982
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
983
&sigchld_action.sa_mask,
984
NULL));
681
985
if(ret < 0){
682
perror("sigprocmask");
683
exitstatus = EXIT_FAILURE;
684
goto end;
986
error(0, errno, "sigprocmask");
987
exitstatus = EX_OSERR;
988
goto fallback;
685
989
}
686
// Starting a new process to be watched
687
pid_t pid = fork();
990
/* Starting a new process to be watched */
991
pid_t pid;
992
do {
993
pid = fork();
994
} while(pid == -1 and errno == EINTR);
688
995
if(pid == -1){
689
perror("fork");
690
exitstatus = EXIT_FAILURE;
691
goto end;
996
error(0, errno, "fork");
997
exitstatus = EX_OSERR;
998
goto fallback;
692
999
}
693
1000
if(pid == 0){
694
1001
/* this is the child process */
695
1002
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
696
1003
if(ret < 0){
697
perror("sigaction");
698
_exit(EXIT_FAILURE);
1004
error(0, errno, "sigaction");
1005
_exit(EX_OSERR);
699
1006
}
700
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1007
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
701
1008
if(ret < 0){
702
perror("sigprocmask");
703
_exit(EXIT_FAILURE);
1009
error(0, errno, "sigprocmask");
1010
_exit(EX_OSERR);
704
1011
}
705
1012
706
1013
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
707
1014
if(ret == -1){
708
perror("dup2");
709
_exit(EXIT_FAILURE);
1015
error(0, errno, "dup2");
1016
_exit(EX_OSERR);
710
1017
}
711
1018
712
1019
if(dirfd(dir) < 0){
716
1023
}
717
1024
if(p->environ[0] == NULL){
718
1025
if(execv(filename, p->argv) < 0){
719
perror("execv");
720
_exit(EXIT_FAILURE);
1026
error(0, errno, "execv for %s", filename);
1027
_exit(EX_OSERR);
721
1028
}
722
1029
} else {
723
1030
if(execve(filename, p->argv, p->environ) < 0){
724
perror("execve");
725
_exit(EXIT_FAILURE);
1031
error(0, errno, "execve for %s", filename);
1032
_exit(EX_OSERR);
726
1033
}
727
1034
}
728
1035
/* no return */
729
1036
}
730
/* parent process */
1037
/* Parent process */
1038
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1039
pipe */
731
1040
free(filename);
732
close(pipefd[1]); /* close unused write end of pipe */
733
process *new_process = malloc(sizeof(process));
734
if (new_process == NULL){
735
perror("malloc");
736
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1041
plugin *new_plugin = getplugin(dirst->d_name);
1042
if(new_plugin == NULL){
1043
error(0, errno, "getplugin");
1044
ret = (int)(TEMP_FAILURE_RETRY
1045
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1046
NULL)));
737
1047
if(ret < 0){
738
perror("sigprocmask");
1048
error(0, errno, "sigprocmask");
739
1049
}
740
exitstatus = EXIT_FAILURE;
741
goto end;
1050
exitstatus = EX_OSERR;
1051
goto fallback;
742
1052
}
743
1053
744
*new_process = (struct process){ .pid = pid,
745
.fd = pipefd[0],
746
.next = process_list };
747
// List handling
748
process_list = new_process;
1054
new_plugin->pid = pid;
1055
new_plugin->fd = pipefd[0];
1056
749
1057
/* Unblock SIGCHLD so signal handler can be run if this process
750
1058
has already completed */
751
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1059
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1060
&sigchld_action.sa_mask,
1061
NULL));
752
1062
if(ret < 0){
753
perror("sigprocmask");
754
exitstatus = EXIT_FAILURE;
755
goto end;
756
}
757
758
FD_SET(new_process->fd, &rfds_all);
759
760
if (maxfd < new_process->fd){
761
maxfd = new_process->fd;
762
}
763
764
}
765
766
/* Free the plugin list */
767
for(plugin *next; plugin_list != NULL; plugin_list = next){
768
next = plugin_list->next;
769
free(plugin_list->argv);
770
if(plugin_list->environ[0] != NULL){
771
for(char **e = plugin_list->environ; *e != NULL; e++){
772
free(*e);
773
}
774
}
775
free(plugin_list);
776
}
777
778
closedir(dir);
1063
error(0, errno, "sigprocmask");
1064
exitstatus = EX_OSERR;
1065
goto fallback;
1066
}
1067
1068
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1069
-Wconversion */
1070
1071
if(maxfd < new_plugin->fd){
1072
maxfd = new_plugin->fd;
1073
}
1074
}
1075
1076
TEMP_FAILURE_RETRY(closedir(dir));
779
1077
dir = NULL;
780
781
if (process_list == NULL){
782
fprintf(stderr, "No plugin processes started. Incorrect plugin"
783
" directory?\n");
784
process_list = NULL;
1078
free_plugin(getplugin(NULL));
1079
1080
for(plugin *p = plugin_list; p != NULL; p = p->next){
1081
if(p->pid != 0){
1082
break;
1083
}
1084
if(p->next == NULL){
1085
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1086
" directory?\n");
1087
free_plugin_list();
1088
}
785
1089
}
786
while(process_list){
1090
1091
/* Main loop while running plugins exist */
1092
while(plugin_list){
787
1093
fd_set rfds = rfds_all;
788
1094
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
789
if (select_ret == -1){
790
perror("select");
791
exitstatus = EXIT_FAILURE;
792
goto end;
1095
if(select_ret == -1 and errno != EINTR){
1096
error(0, errno, "select");
1097
exitstatus = EX_OSERR;
1098
goto fallback;
793
1099
}
794
1100
/* OK, now either a process completed, or something can be read
795
1101
from one of them */
796
for(process *proc = process_list; proc ; proc = proc->next){
1102
for(plugin *proc = plugin_list; proc != NULL;){
797
1103
/* Is this process completely done? */
798
if(proc->eof and proc->completed){
1104
if(proc->completed and proc->eof){
799
1105
/* Only accept the plugin output if it exited cleanly */
800
1106
if(not WIFEXITED(proc->status)
801
1107
or WEXITSTATUS(proc->status) != 0){
802
1108
/* Bad exit by plugin */
1109
803
1110
if(debug){
804
1111
if(WIFEXITED(proc->status)){
805
fprintf(stderr, "Plugin %u exited with status %d\n",
806
(unsigned int) (proc->pid),
1112
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1113
" status %d\n", proc->name,
1114
(intmax_t) (proc->pid),
807
1115
WEXITSTATUS(proc->status));
808
} else if(WIFSIGNALED(proc->status)) {
809
fprintf(stderr, "Plugin %u killed by signal %d\n",
810
(unsigned int) (proc->pid),
811
WTERMSIG(proc->status));
1116
} else if(WIFSIGNALED(proc->status)){
1117
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1118
" signal %d: %s\n", proc->name,
1119
(intmax_t) (proc->pid),
1120
WTERMSIG(proc->status),
1121
strsignal(WTERMSIG(proc->status)));
812
1122
} else if(WCOREDUMP(proc->status)){
813
fprintf(stderr, "Plugin %d dumped core\n",
814
(unsigned int) (proc->pid));
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1124
" core\n", proc->name, (intmax_t) (proc->pid));
815
1125
}
816
1126
}
1127
817
1128
/* Remove the plugin */
818
FD_CLR(proc->fd, &rfds_all);
1129
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1130
-Wconversion */
1131
819
1132
/* Block signal while modifying process_list */
820
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1134
(SIG_BLOCK,
1135
&sigchld_action.sa_mask,
1136
NULL));
821
1137
if(ret < 0){
822
perror("sigprocmask");
823
exitstatus = EXIT_FAILURE;
824
goto end;
825
}
826
/* Delete this process entry from the list */
827
if(process_list == proc){
828
/* First one - simple */
829
process_list = proc->next;
830
} else {
831
/* Second one or later */
832
for(process *p = process_list; p != NULL; p = p->next){
833
if(p->next == proc){
834
p->next = proc->next;
835
break;
836
}
837
}
838
}
1138
error(0, errno, "sigprocmask");
1139
exitstatus = EX_OSERR;
1140
goto fallback;
1141
}
1142
1143
plugin *next_plugin = proc->next;
1144
free_plugin(proc);
1145
proc = next_plugin;
1146
839
1147
/* We are done modifying process list, so unblock signal */
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
841
NULL);
1148
ret = (int)(TEMP_FAILURE_RETRY
1149
(sigprocmask(SIG_UNBLOCK,
1150
&sigchld_action.sa_mask, NULL)));
842
1151
if(ret < 0){
843
perror("sigprocmask");
844
}
845
free(proc->buffer);
846
free(proc);
847
/* We deleted this process from the list, so we can't go
848
proc->next. Therefore, start over from the beginning of
849
the process list */
850
break;
1152
error(0, errno, "sigprocmask");
1153
exitstatus = EX_OSERR;
1154
goto fallback;
1155
}
1156
1157
if(plugin_list == NULL){
1158
break;
1159
}
1160
1161
continue;
851
1162
}
1163
852
1164
/* This process exited nicely, so print its buffer */
853
854
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1165
1166
bool bret = print_out_password(proc->buffer,
1167
proc->buffer_length);
855
1168
if(not bret){
856
perror("print_out_password");
857
exitstatus = EXIT_FAILURE;
1169
error(0, errno, "print_out_password");
1170
exitstatus = EX_IOERR;
858
1171
}
859
goto end;
1172
goto fallback;
860
1173
}
1174
861
1175
/* This process has not completed. Does it have any output? */
862
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1176
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1177
warning from
1178
-Wconversion */
863
1179
/* This process had nothing to say at this time */
1180
proc = proc->next;
864
1181
continue;
865
1182
}
866
1183
/* Before reading, make the process' data buffer large enough */
867
1184
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
868
1185
proc->buffer = realloc(proc->buffer, proc->buffer_size
869
1186
+ (size_t) BUFFER_SIZE);
870
if (proc->buffer == NULL){
871
perror("malloc");
872
exitstatus = EXIT_FAILURE;
873
goto end;
1187
if(proc->buffer == NULL){
1188
error(0, errno, "malloc");
1189
exitstatus = EX_OSERR;
1190
goto fallback;
874
1191
}
875
1192
proc->buffer_size += BUFFER_SIZE;
876
1193
}
877
1194
/* Read from the process */
878
ret = read(proc->fd, proc->buffer + proc->buffer_length,
879
BUFFER_SIZE);
880
if(ret < 0){
1195
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1196
proc->buffer
1197
+ proc->buffer_length,
1198
BUFFER_SIZE));
1199
if(sret < 0){
881
1200
/* Read error from this process; ignore the error */
1201
proc = proc->next;
882
1202
continue;
883
1203
}
884
if(ret == 0){
1204
if(sret == 0){
885
1205
/* got EOF */
886
1206
proc->eof = true;
887
1207
} else {
888
proc->buffer_length += (size_t) ret;
1208
proc->buffer_length += (size_t) sret;
889
1209
}
890
1210
}
891
1211
}
892
893
894
end:
895
896
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
897
/* Fallback if all plugins failed, none are found or an error occured */
1212
1213
1214
fallback:
1215
1216
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1217
and exitstatus != EX_OK)){
1218
/* Fallback if all plugins failed, none are found or an error
1219
occured */
898
1220
bool bret;
899
1221
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
900
1222
char *passwordbuffer = getpass("Password: ");
901
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1223
size_t len = strlen(passwordbuffer);
1224
/* Strip trailing newline */
1225
if(len > 0 and passwordbuffer[len-1] == '\n'){
1226
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1227
len--;
1228
}
1229
bret = print_out_password(passwordbuffer, len);
902
1230
if(not bret){
903
perror("print_out_password");
904
exitstatus = EXIT_FAILURE;
905
goto end;
1231
error(0, errno, "print_out_password");
1232
exitstatus = EX_IOERR;
906
1233
}
907
1234
}
908
1235
909
1236
/* Restore old signal handler */
910
sigaction(SIGCHLD, &old_sigchld_action, NULL);
911
912
free(custom_argv);
913
914
/* Free the plugin list */
915
for(plugin *next; plugin_list != NULL; plugin_list = next){
916
next = plugin_list->next;
917
free(plugin_list->argv);
918
if(plugin_list->environ[0] != NULL){
919
for(char **e = plugin_list->environ; *e != NULL; e++){
920
free(*e);
921
}
1237
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1238
if(ret == -1){
1239
error(0, errno, "sigaction");
1240
exitstatus = EX_OSERR;
1241
}
1242
1243
if(custom_argv != NULL){
1244
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1245
free(*arg);
922
1246
}
923
free(plugin_list->environ);
924
free(plugin_list);
1247
free(custom_argv);
925
1248
}
926
1249
927
1250
if(dir != NULL){
928
1251
closedir(dir);
929
1252
}
930
1253
931
/* Free the process list and kill the processes */
932
for(process *next; process_list != NULL; process_list = next){
933
next = process_list->next;
934
close(process_list->fd);
935
ret = kill(process_list->pid, SIGTERM);
936
if(ret == -1 and errno != ESRCH){
937
/* set-uid proccesses migth not get closed */
938
perror("kill");
1254
/* Kill the processes */
1255
for(plugin *p = plugin_list; p != NULL; p = p->next){
1256
if(p->pid != 0){
1257
close(p->fd);
1258
ret = kill(p->pid, SIGTERM);
1259
if(ret == -1 and errno != ESRCH){
1260
/* Set-uid proccesses might not get closed */
1261
error(0, errno, "kill");
1262
}
939
1263
}
940
free(process_list->buffer);
941
free(process_list);
942
1264
}
943
1265
944
1266
/* Wait for any remaining child processes to terminate */
945
do{
1267
do {
946
1268
ret = wait(NULL);
947
1269
} while(ret >= 0);
948
1270
if(errno != ECHILD){
949
perror("wait");
1271
error(0, errno, "wait");
950
1272
}
951
1273
1274
free_plugin_list();
1275
1276
free(plugindir);
1277
free(argfile);
1278
952
1279
return exitstatus;
953
1280
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0