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- Committer: Teddy Hogeborn
- Date: 2008-08-18 03:50:28 UTC
- Revision ID: teddy@fukt.bsnet.se-20080818035028-su31apqs2pv2147v
* mandos-keygen.xml: Removed <?xml-stylesheet>. New entity
"&OVERVIEW;" referring to "overview.xml".
(PURPOSE, OVERVIEW): New sections, same as in mandos(8).
(EXAMPLES): Renamed to "EXAMPLE", as per man-pages(7).
* mandos.xml (OPTIONS, CLIENTS): Slight wording change.
"&OVERVIEW;" referring to "overview.xml".
(PURPOSE, OVERVIEW): New sections, same as in mandos(8).
(EXAMPLES): Renamed to "EXAMPLE", as per man-pages(7).
* mandos.xml (OPTIONS, CLIENTS): Slight wording change.
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
28
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
33
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
40
WEXITSTATUS() */
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
53
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
53
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
61
58
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
64
60
#include <signal.h> /* struct sigaction, sigemptyset(),
65
61
sigaddset(), sigaction(),
66
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
63
SIG_UNBLOCK, kill() */
69
64
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
65
72
66
#define BUFFER_SIZE 256
73
74
#define PDIR "/lib/mandos/plugins.d"
75
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
76
77
const char *argp_program_version = "plugin-runner " VERSION;
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
78
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
79
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;
85
80
86
typedef struct plugin{
81
87
char *name; /* can be NULL or any plugin name */
82
88
char **argv;
84
90
char **environ;
85
91
int envc;
86
92
bool disabled;
87
88
/* Variables used for running processes*/
89
pid_t pid;
90
int fd;
91
char *buffer;
92
size_t buffer_size;
93
size_t buffer_length;
94
bool eof;
95
volatile sig_atomic_t completed;
96
int status;
97
93
struct plugin *next;
98
94
} plugin;
99
95
100
static plugin *plugin_list = NULL;
101
102
/* Gets an existing plugin based on name,
103
or if none is found, creates a new one */
104
static plugin *getplugin(char *name){
105
/* Check for exiting plugin with that name */
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
107
if((p->name == name)
108
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
109
100
return p;
110
101
}
111
102
}
112
103
/* Create a new plugin */
113
plugin *new_plugin = NULL;
114
do {
115
new_plugin = malloc(sizeof(plugin));
116
} while(new_plugin == NULL and errno == EINTR);
117
if(new_plugin == NULL){
118
return NULL;
119
}
120
char *copy_name = NULL;
121
if(name != NULL){
122
do {
123
copy_name = strdup(name);
124
} while(copy_name == NULL and errno == EINTR);
125
if(copy_name == NULL){
126
free(new_plugin);
127
return NULL;
128
}
129
}
130
131
*new_plugin = (plugin){ .name = copy_name,
132
.argc = 1,
133
.disabled = false,
134
.next = plugin_list };
135
136
do {
137
new_plugin->argv = malloc(sizeof(char *) * 2);
138
} while(new_plugin->argv == NULL and errno == EINTR);
139
if(new_plugin->argv == NULL){
140
free(copy_name);
104
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
106
return NULL;
107
}
108
char *copy_name = strdup(name);
109
if(copy_name == NULL){
110
return NULL;
111
}
112
113
*new_plugin = (plugin) { .name = copy_name,
114
.argc = 1,
115
.envc = 0,
116
.disabled = false,
117
.next = *plugin_list };
118
119
new_plugin->argv = malloc(sizeof(char *) * 2);
120
if (new_plugin->argv == NULL){
141
121
free(new_plugin);
142
122
return NULL;
143
123
}
144
124
new_plugin->argv[0] = copy_name;
145
125
new_plugin->argv[1] = NULL;
146
147
do {
148
new_plugin->environ = malloc(sizeof(char *));
149
} while(new_plugin->environ == NULL and errno == EINTR);
126
127
new_plugin->environ = malloc(sizeof(char *));
150
128
if(new_plugin->environ == NULL){
151
free(copy_name);
152
129
free(new_plugin->argv);
153
130
free(new_plugin);
154
131
return NULL;
155
132
}
156
133
new_plugin->environ[0] = NULL;
157
158
134
/* Append the new plugin to the list */
159
plugin_list = new_plugin;
135
*plugin_list = new_plugin;
160
136
return new_plugin;
161
137
}
162
138
164
140
static bool add_to_char_array(const char *new, char ***array,
165
141
int *len){
166
142
/* Resize the pointed-to array to hold one more pointer */
167
do {
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
143
*array = realloc(*array, sizeof(char *)
144
* (size_t) ((*len) + 2));
171
145
/* Malloc check */
172
146
if(*array == NULL){
173
147
return false;
174
148
}
175
149
/* Make a copy of the new string */
176
char *copy;
177
do {
178
copy = strdup(new);
179
} while(copy == NULL and errno == EINTR);
150
char *copy = strdup(new);
180
151
if(copy == NULL){
181
152
return false;
182
153
}
197
168
}
198
169
199
170
/* Add to a plugin's environment */
200
static bool add_environment(plugin *p, const char *def, bool replace){
171
static bool add_environment(plugin *p, const char *def){
201
172
if(p == NULL){
202
173
return false;
203
174
}
204
/* namelen = length of name of environment variable */
205
size_t namelen = (size_t)(strchrnul(def, '=') - def);
206
/* Search for this environment variable */
207
for(char **e = p->environ; *e != NULL; e++){
208
if(strncmp(*e, def, namelen + 1) == 0){
209
/* It already exists */
210
if(replace){
211
char *new;
212
do {
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
215
if(new == NULL){
216
return false;
217
}
218
*e = new;
219
strcpy(*e, def);
220
}
221
return true;
222
}
223
}
224
175
return add_to_char_array(def, &(p->environ), &(p->envc));
225
176
}
226
177
178
227
179
/*
228
180
* Based on the example in the GNU LibC manual chapter 13.13 "File
229
181
* Descriptor Flags".
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
182
* *Note File Descriptor Flags:(libc)Descriptor Flags.
231
183
*/
232
static int set_cloexec_flag(int fd){
233
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
184
static int set_cloexec_flag(int fd)
185
{
186
int ret = fcntl(fd, F_GETFD, 0);
234
187
/* If reading the flags failed, return error indication now. */
235
188
if(ret < 0){
236
189
return ret;
237
190
}
238
191
/* Store modified flag word in the descriptor. */
239
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
240
ret | FD_CLOEXEC));
192
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
241
193
}
242
194
195
process *process_list = NULL;
243
196
244
/* Mark processes as completed when they exit, and save their exit
197
/* Mark a process as completed when it exits, and save its exit
245
198
status. */
246
static void handle_sigchld(__attribute__((unused)) int sig){
247
int old_errno = errno;
248
while(true){
249
plugin *proc = plugin_list;
250
int status;
251
pid_t pid = waitpid(-1, &status, WNOHANG);
252
if(pid == 0){
253
/* Only still running child processes */
254
break;
255
}
256
if(pid == -1){
257
if(errno == ECHILD){
258
/* No child processes */
259
break;
260
}
261
perror("waitpid");
262
}
263
264
/* A child exited, find it in process_list */
265
while(proc != NULL and proc->pid != pid){
266
proc = proc->next;
267
}
268
if(proc == NULL){
269
/* Process not found in process list */
270
continue;
271
}
272
proc->status = status;
273
proc->completed = 1;
274
}
275
errno = old_errno;
199
void handle_sigchld(__attribute__((unused)) int sig){
200
process *proc = process_list;
201
int status;
202
pid_t pid = wait(&status);
203
if(pid == -1){
204
perror("wait");
205
return;
206
}
207
while(proc != NULL and proc->pid != pid){
208
proc = proc->next;
209
}
210
if(proc == NULL){
211
/* Process not found in process list */
212
return;
213
}
214
proc->status = status;
215
proc->completed = true;
276
216
}
277
217
278
/* Prints out a password to stdout */
279
static bool print_out_password(const char *buffer, size_t length){
218
bool print_out_password(const char *buffer, size_t length){
280
219
ssize_t ret;
220
if(length>0 and buffer[length-1] == '\n'){
221
length--;
222
}
281
223
for(size_t written = 0; written < length; written += (size_t)ret){
282
224
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
283
225
length - written));
288
230
return true;
289
231
}
290
232
291
/* Removes and free a plugin from the plugin list */
292
static void free_plugin(plugin *plugin_node){
293
294
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
295
free(*arg);
296
}
297
free(plugin_node->argv);
298
for(char **env = plugin_node->environ; *env != NULL; env++){
299
free(*env);
300
}
301
free(plugin_node->environ);
302
free(plugin_node->buffer);
303
304
/* Removes the plugin from the singly-linked list */
305
if(plugin_node == plugin_list){
306
/* First one - simple */
307
plugin_list = plugin_list->next;
308
} else {
309
/* Second one or later */
310
for(plugin *p = plugin_list; p != NULL; p = p->next){
311
if(p->next == plugin_node){
312
p->next = plugin_node->next;
313
break;
314
}
233
char **add_to_argv(char **argv, int *argc, char *arg){
234
if (argv == NULL){
235
*argc = 1;
236
argv = malloc(sizeof(char*) * 2);
237
if(argv == NULL){
238
return NULL;
315
239
}
316
}
317
318
free(plugin_node);
240
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
241
argv[1] = NULL;
242
}
243
*argc += 1;
244
argv = realloc(argv, sizeof(char *)
245
* ((unsigned int) *argc + 1));
246
if(argv == NULL){
247
return NULL;
248
}
249
argv[*argc-1] = arg;
250
argv[*argc] = NULL;
251
return argv;
319
252
}
320
253
321
static void free_plugin_list(void){
322
while(plugin_list != NULL){
323
free_plugin(plugin_list);
324
}
254
static void free_plugin_list(plugin *plugin_list){
255
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
256
next = plugin_list->next;
257
free(plugin_list->name);
258
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
259
free(*arg);
260
}
261
free(plugin_list->argv);
262
for(char **env = plugin_list->environ; *env != NULL; env++){
263
free(*env);
264
}
265
free(plugin_list->environ);
266
free(plugin_list);
267
}
325
268
}
326
269
327
270
int main(int argc, char *argv[]){
328
char *plugindir = NULL;
329
char *argfile = NULL;
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
330
273
FILE *conffp;
331
274
size_t d_name_len;
332
275
DIR *dir = NULL;
334
277
struct stat st;
335
278
fd_set rfds_all;
336
279
int ret, maxfd = 0;
337
ssize_t sret;
338
280
uid_t uid = 65534;
339
281
gid_t gid = 65534;
340
282
bool debug = false;
356
298
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
357
299
if(ret == -1){
358
300
perror("sigaction");
359
exitstatus = EXIT_FAILURE;
301
exitstatus = EXIT_FAILURE;
360
302
goto fallback;
361
303
}
362
304
365
307
{ .name = "global-options", .key = 'g',
366
308
.arg = "OPTION[,OPTION[,...]]",
367
309
.doc = "Options passed to all plugins" },
368
{ .name = "global-env", .key = 'G',
310
{ .name = "global-envs", .key = 'e',
369
311
.arg = "VAR=value",
370
312
.doc = "Environment variable passed to all plugins" },
371
313
{ .name = "options-for", .key = 'o',
372
314
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
373
315
.doc = "Options passed only to specified plugin" },
374
{ .name = "env-for", .key = 'E',
316
{ .name = "envs-for", .key = 'f',
375
317
.arg = "PLUGIN:ENV=value",
376
318
.doc = "Environment variable passed to specified plugin" },
377
319
{ .name = "disable", .key = 'd',
378
320
.arg = "PLUGIN",
379
321
.doc = "Disable a specific plugin", .group = 1 },
380
{ .name = "enable", .key = 'e',
381
.arg = "PLUGIN",
382
.doc = "Enable a specific plugin", .group = 1 },
383
322
{ .name = "plugin-dir", .key = 128,
384
323
.arg = "DIRECTORY",
385
324
.doc = "Specify a different plugin directory", .group = 2 },
386
{ .name = "config-file", .key = 129,
387
.arg = "FILE",
388
.doc = "Specify a different configuration file", .group = 2 },
389
{ .name = "userid", .key = 130,
390
.arg = "ID", .flags = 0,
391
.doc = "User ID the plugins will run as", .group = 3 },
392
{ .name = "groupid", .key = 131,
393
.arg = "ID", .flags = 0,
394
.doc = "Group ID the plugins will run as", .group = 3 },
395
{ .name = "debug", .key = 132,
396
.doc = "Debug mode", .group = 4 },
325
{ .name = "userid", .key = 129,
326
.arg = "ID", .flags = 0,
327
.doc = "User ID the plugins will run as", .group = 2 },
328
{ .name = "groupid", .key = 130,
329
.arg = "ID", .flags = 0,
330
.doc = "Group ID the plugins will run as", .group = 2 },
331
{ .name = "debug", .key = 131,
332
.doc = "Debug mode", .group = 3 },
397
333
{ .name = NULL }
398
334
};
399
335
400
error_t parse_opt(int key, char *arg, __attribute__((unused))
401
struct argp_state *state){
402
switch(key){
403
char *tmp;
404
intmax_t tmpmax;
405
case 'g': /* --global-options */
406
if(arg != NULL){
407
char *plugin_option;
408
while((plugin_option = strsep(&arg, ",")) != NULL){
409
if(plugin_option[0] == '\0'){
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
340
switch (key) {
341
case 'g':
342
if (arg != NULL){
343
char *p;
344
while((p = strsep(&arg, ",")) != NULL){
345
if(p[0] == '\0'){
410
346
continue;
411
347
}
412
if(not add_argument(getplugin(NULL), plugin_option)){
348
if(not add_argument(getplugin(NULL, plugins), p)){
413
349
perror("add_argument");
414
350
return ARGP_ERR_UNKNOWN;
415
351
}
416
352
}
417
353
}
418
354
break;
419
case 'G': /* --global-env */
355
case 'e':
420
356
if(arg == NULL){
421
357
break;
422
358
}
423
if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
425
367
}
426
368
break;
427
case 'o': /* --options-for */
428
if(arg != NULL){
429
char *plugin_name = strsep(&arg, ":");
430
if(plugin_name[0] == '\0'){
431
break;
432
}
433
char *plugin_option;
434
while((plugin_option = strsep(&arg, ",")) != NULL){
435
if(not add_argument(getplugin(plugin_name), plugin_option)){
436
perror("add_argument");
437
return ARGP_ERR_UNKNOWN;
369
case 'o':
370
if (arg != NULL){
371
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
373
break;
374
}
375
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
377
break;
378
}
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
438
389
}
439
390
}
440
391
}
441
392
break;
442
case 'E': /* --env-for */
393
case 'f':
443
394
if(arg == NULL){
444
395
break;
445
396
}
448
399
if(envdef == NULL){
449
400
break;
450
401
}
451
*envdef = '\0';
452
if(not add_environment(getplugin(arg), envdef+1, true)){
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
406
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
453
408
perror("add_environment");
454
409
}
455
410
}
456
411
break;
457
case 'd': /* --disable */
458
if(arg != NULL){
459
plugin *p = getplugin(arg);
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
460
415
if(p == NULL){
461
416
return ARGP_ERR_UNKNOWN;
462
417
}
463
418
p->disabled = true;
464
419
}
465
420
break;
466
case 'e': /* --enable */
467
if(arg != NULL){
468
plugin *p = getplugin(arg);
469
if(p == NULL){
470
return ARGP_ERR_UNKNOWN;
471
}
472
p->disabled = false;
473
}
474
break;
475
case 128: /* --plugin-dir */
476
free(plugindir);
477
plugindir = strdup(arg);
478
if(plugindir == NULL){
479
perror("strdup");
480
}
481
break;
482
case 129: /* --config-file */
483
/* This is already done by parse_opt_config_file() */
484
break;
485
case 130: /* --userid */
486
errno = 0;
487
tmpmax = strtoimax(arg, &tmp, 10);
488
if(errno != 0 or tmp == arg or *tmp != '\0'
489
or tmpmax != (uid_t)tmpmax){
490
fprintf(stderr, "Bad user ID number: \"%s\", using %"
491
PRIdMAX "\n", arg, (intmax_t)uid);
492
} else {
493
uid = (uid_t)tmpmax;
494
}
495
break;
496
case 131: /* --groupid */
497
errno = 0;
498
tmpmax = strtoimax(arg, &tmp, 10);
499
if(errno != 0 or tmp == arg or *tmp != '\0'
500
or tmpmax != (gid_t)tmpmax){
501
fprintf(stderr, "Bad group ID number: \"%s\", using %"
502
PRIdMAX "\n", arg, (intmax_t)gid);
503
} else {
504
gid = (gid_t)tmpmax;
505
}
506
break;
507
case 132: /* --debug */
421
case 128:
422
plugindir = arg;
423
break;
424
case 129:
425
uid = (uid_t)strtol(arg, NULL, 10);
426
break;
427
case 130:
428
gid = (gid_t)strtol(arg, NULL, 10);
429
break;
430
case 131:
508
431
debug = true;
509
432
break;
510
/*
511
* When adding more options before this line, remember to also add a
512
* "case" to the "parse_opt_config_file" function below.
513
*/
514
case ARGP_KEY_ARG:
515
/* Cryptsetup always passes an argument, which is an empty
516
string if "none" was specified in /etc/crypttab. So if
517
argument was empty, we ignore it silently. */
518
if(arg[0] != '\0'){
519
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
520
}
521
break;
522
case ARGP_KEY_END:
523
break;
524
default:
525
return ARGP_ERR_UNKNOWN;
526
}
527
return 0;
528
}
529
530
/* This option parser is the same as parse_opt() above, except it
531
ignores everything but the --config-file option. */
532
error_t parse_opt_config_file(int key, char *arg,
533
__attribute__((unused))
534
struct argp_state *state){
535
switch(key){
536
case 'g': /* --global-options */
537
case 'G': /* --global-env */
538
case 'o': /* --options-for */
539
case 'E': /* --env-for */
540
case 'd': /* --disable */
541
case 'e': /* --enable */
542
case 128: /* --plugin-dir */
543
break;
544
case 129: /* --config-file */
545
free(argfile);
546
argfile = strdup(arg);
547
if(argfile == NULL){
548
perror("strdup");
549
}
550
break;
551
case 130: /* --userid */
552
case 131: /* --groupid */
553
case 132: /* --debug */
554
case ARGP_KEY_ARG:
555
case ARGP_KEY_END:
556
break;
557
default:
558
return ARGP_ERR_UNKNOWN;
559
}
560
return 0;
561
}
562
563
struct argp argp = { .options = options,
564
.parser = parse_opt_config_file,
565
.args_doc = "",
433
case ARGP_KEY_ARG:
434
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
435
break;
436
case ARGP_KEY_END:
437
break;
438
default:
439
return ARGP_ERR_UNKNOWN;
440
}
441
return 0;
442
}
443
444
plugin *plugin_list = NULL;
445
446
struct argp argp = { .options = options, .parser = parse_opt,
447
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
566
448
.doc = "Mandos plugin runner -- Run plugins" };
567
449
568
/* Parse using parse_opt_config_file() in order to get the custom
569
config file location, if any. */
570
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
571
if(ret == ARGP_ERR_UNKNOWN){
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
451
if (ret == ARGP_ERR_UNKNOWN){
572
452
fprintf(stderr, "Unknown error while parsing arguments\n");
573
453
exitstatus = EXIT_FAILURE;
574
454
goto fallback;
575
455
}
576
577
/* Reset to the normal argument parser */
578
argp.parser = parse_opt;
579
580
/* Open the configfile if available */
581
if(argfile == NULL){
582
conffp = fopen(AFILE, "r");
583
} else {
584
conffp = fopen(argfile, "r");
585
}
456
457
conffp = fopen(argfile, "r");
586
458
if(conffp != NULL){
587
459
char *org_line = NULL;
588
460
char *p, *arg, *new_arg, *line;
589
461
size_t size = 0;
462
ssize_t sret;
590
463
const char whitespace_delims[] = " \r\t\f\v\n";
591
464
const char comment_delim[] = "#";
592
593
custom_argc = 1;
594
custom_argv = malloc(sizeof(char*) * 2);
595
if(custom_argv == NULL){
596
perror("malloc");
597
exitstatus = EXIT_FAILURE;
598
goto fallback;
599
}
600
custom_argv[0] = argv[0];
601
custom_argv[1] = NULL;
602
603
/* for each line in the config file, strip whitespace and ignore
604
commented text */
465
605
466
while(true){
606
467
sret = getline(&org_line, &size, conffp);
607
468
if(sret == -1){
608
469
break;
609
470
}
610
471
611
472
line = org_line;
612
473
arg = strsep(&line, comment_delim);
613
474
while((p = strsep(&arg, whitespace_delims)) != NULL){
615
476
continue;
616
477
}
617
478
new_arg = strdup(p);
618
if(new_arg == NULL){
619
perror("strdup");
620
exitstatus = EXIT_FAILURE;
621
free(org_line);
622
goto fallback;
623
}
624
625
custom_argc += 1;
626
custom_argv = realloc(custom_argv, sizeof(char *)
627
* ((unsigned int) custom_argc + 1));
628
if(custom_argv == NULL){
629
perror("realloc");
630
exitstatus = EXIT_FAILURE;
631
free(org_line);
632
goto fallback;
633
}
634
custom_argv[custom_argc-1] = new_arg;
635
custom_argv[custom_argc] = NULL;
479
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
480
if (custom_argv == NULL){
481
perror("add_to_argv");
482
exitstatus = EXIT_FAILURE;
483
goto fallback;
484
}
636
485
}
637
486
}
638
do {
639
ret = fclose(conffp);
640
} while(ret == EOF and errno == EINTR);
641
if(ret == EOF){
642
perror("fclose");
643
exitstatus = EXIT_FAILURE;
644
goto fallback;
645
}
646
487
free(org_line);
647
} else {
488
} else{
648
489
/* Check for harmful errors and go to fallback. Other errors might
649
490
not affect opening plugins */
650
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
491
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
651
492
perror("fopen");
652
493
exitstatus = EXIT_FAILURE;
653
494
goto fallback;
654
495
}
655
496
}
656
/* If there was any arguments from configuration file,
657
pass them to parser as command arguments */
497
658
498
if(custom_argv != NULL){
659
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
660
0, NULL);
661
if(ret == ARGP_ERR_UNKNOWN){
499
custom_argv[0] = argv[0];
500
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
501
if (ret == ARGP_ERR_UNKNOWN){
662
502
fprintf(stderr, "Unknown error while parsing arguments\n");
663
503
exitstatus = EXIT_FAILURE;
664
504
goto fallback;
665
505
}
666
506
}
667
507
668
/* Parse actual command line arguments, to let them override the
669
config file */
670
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
671
if(ret == ARGP_ERR_UNKNOWN){
672
fprintf(stderr, "Unknown error while parsing arguments\n");
673
exitstatus = EXIT_FAILURE;
674
goto fallback;
675
}
676
677
508
if(debug){
678
509
for(plugin *p = plugin_list; p != NULL; p=p->next){
679
510
fprintf(stderr, "Plugin: %s has %d arguments\n",
681
512
for(char **a = p->argv; *a != NULL; a++){
682
513
fprintf(stderr, "\tArg: %s\n", *a);
683
514
}
684
fprintf(stderr, "...and %d environment variables\n", p->envc);
515
fprintf(stderr, "...and %u environment variables\n", p->envc);
685
516
for(char **a = p->environ; *a != NULL; a++){
686
517
fprintf(stderr, "\t%s\n", *a);
687
518
}
688
519
}
689
520
}
690
521
691
/* Strip permissions down to nobody */
522
ret = setuid(uid);
523
if (ret == -1){
524
perror("setuid");
525
}
526
692
527
setgid(gid);
693
if(ret == -1){
528
if (ret == -1){
694
529
perror("setgid");
695
530
}
696
ret = setuid(uid);
697
if(ret == -1){
698
perror("setuid");
699
}
700
701
if(plugindir == NULL){
702
dir = opendir(PDIR);
703
} else {
704
dir = opendir(plugindir);
705
}
706
531
532
dir = opendir(plugindir);
707
533
if(dir == NULL){
708
534
perror("Could not open plugin dir");
709
535
exitstatus = EXIT_FAILURE;
725
551
726
552
FD_ZERO(&rfds_all);
727
553
728
/* Read and execute any executable in the plugin directory*/
729
554
while(true){
730
do {
731
dirst = readdir(dir);
732
} while(dirst == NULL and errno == EINTR);
555
dirst = readdir(dir);
733
556
734
/* All directory entries have been processed */
557
// All directory entries have been processed
735
558
if(dirst == NULL){
736
if(errno == EBADF){
559
if (errno == EBADF){
737
560
perror("readdir");
738
561
exitstatus = EXIT_FAILURE;
739
562
goto fallback;
743
566
744
567
d_name_len = strlen(dirst->d_name);
745
568
746
/* Ignore dotfiles, backup files and other junk */
569
// Ignore dotfiles, backup files and other junk
747
570
{
748
571
bool bad_name = false;
749
572
751
574
752
575
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
753
576
".dpkg-old",
754
".dpkg-bak",
755
577
".dpkg-divert", NULL };
756
578
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
757
579
size_t pre_len = strlen(*pre);
765
587
break;
766
588
}
767
589
}
590
768
591
if(bad_name){
769
592
continue;
770
593
}
594
771
595
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
772
596
size_t suf_len = strlen(*suf);
773
597
if((d_name_len >= suf_len)
786
610
continue;
787
611
}
788
612
}
789
613
790
614
char *filename;
791
if(plugindir == NULL){
792
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
793
dirst->d_name));
794
} else {
795
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
796
plugindir,
797
dirst->d_name));
798
}
615
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
799
616
if(ret < 0){
800
617
perror("asprintf");
801
618
continue;
802
619
}
803
620
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
805
if(ret == -1){
621
ret = stat(filename, &st);
622
if (ret == -1){
806
623
perror("stat");
807
624
free(filename);
808
625
continue;
809
626
}
810
627
811
/* Ignore non-executable files */
812
if(not S_ISREG(st.st_mode)
813
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
628
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
814
629
if(debug){
815
630
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
816
631
" with bad type or mode\n", filename);
818
633
free(filename);
819
634
continue;
820
635
}
821
822
plugin *p = getplugin(dirst->d_name);
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
823
637
if(p == NULL){
824
638
perror("getplugin");
825
639
free(filename);
835
649
}
836
650
{
837
651
/* Add global arguments to argument list for this plugin */
838
plugin *g = getplugin(NULL);
652
plugin *g = getplugin(NULL, &plugin_list);
839
653
if(g != NULL){
840
654
for(char **a = g->argv + 1; *a != NULL; a++){
841
655
if(not add_argument(p, *a)){
844
658
}
845
659
/* Add global environment variables */
846
660
for(char **e = g->environ; *e != NULL; e++){
847
if(not add_environment(p, *e, false)){
661
if(not add_environment(p, *e)){
848
662
perror("add_environment");
849
663
}
850
664
}
855
669
process, too. */
856
670
if(p->environ[0] != NULL){
857
671
for(char **e = environ; *e != NULL; e++){
858
if(not add_environment(p, *e, false)){
672
char *copy = strdup(*e);
673
if(copy == NULL){
674
perror("strdup");
675
continue;
676
}
677
if(not add_environment(p, copy)){
859
678
perror("add_environment");
860
679
}
861
680
}
862
681
}
863
682
864
int pipefd[2];
865
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
866
if(ret == -1){
683
int pipefd[2];
684
ret = pipe(pipefd);
685
if (ret == -1){
867
686
perror("pipe");
868
687
exitstatus = EXIT_FAILURE;
869
688
goto fallback;
870
689
}
871
/* Ask OS to automatic close the pipe on exec */
872
690
ret = set_cloexec_flag(pipefd[0]);
873
691
if(ret < 0){
874
692
perror("set_cloexec_flag");
882
700
goto fallback;
883
701
}
884
702
/* Block SIGCHLD until process is safely in process list */
885
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
886
&sigchld_action.sa_mask,
887
NULL));
703
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
888
704
if(ret < 0){
889
705
perror("sigprocmask");
890
706
exitstatus = EXIT_FAILURE;
891
707
goto fallback;
892
708
}
893
/* Starting a new process to be watched */
894
pid_t pid;
895
do {
896
pid = fork();
897
} while(pid == -1 and errno == EINTR);
709
// Starting a new process to be watched
710
pid_t pid = fork();
898
711
if(pid == -1){
899
712
perror("fork");
900
713
exitstatus = EXIT_FAILURE;
907
720
perror("sigaction");
908
721
_exit(EXIT_FAILURE);
909
722
}
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
723
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
911
724
if(ret < 0){
912
725
perror("sigprocmask");
913
726
_exit(EXIT_FAILURE);
914
727
}
915
728
916
729
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
917
730
if(ret == -1){
918
731
perror("dup2");
937
750
}
938
751
/* no return */
939
752
}
940
/* Parent process */
941
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
942
pipe */
753
/* parent process */
943
754
free(filename);
944
plugin *new_plugin = getplugin(dirst->d_name);
945
if(new_plugin == NULL){
946
perror("getplugin");
947
ret = (int)(TEMP_FAILURE_RETRY
948
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
949
NULL)));
755
close(pipefd[1]); /* close unused write end of pipe */
756
process *new_process = malloc(sizeof(process));
757
if (new_process == NULL){
758
perror("malloc");
759
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
950
760
if(ret < 0){
951
perror("sigprocmask");
761
perror("sigprocmask");
952
762
}
953
763
exitstatus = EXIT_FAILURE;
954
764
goto fallback;
955
765
}
956
766
957
new_plugin->pid = pid;
958
new_plugin->fd = pipefd[0];
959
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
process_list = new_process;
960
772
/* Unblock SIGCHLD so signal handler can be run if this process
961
773
has already completed */
962
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
963
&sigchld_action.sa_mask,
964
NULL));
774
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
965
775
if(ret < 0){
966
776
perror("sigprocmask");
967
777
exitstatus = EXIT_FAILURE;
968
778
goto fallback;
969
779
}
970
780
971
FD_SET(new_plugin->fd, &rfds_all);
781
FD_SET(new_process->fd, &rfds_all);
972
782
973
if(maxfd < new_plugin->fd){
974
maxfd = new_plugin->fd;
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
975
785
}
786
976
787
}
977
788
978
TEMP_FAILURE_RETRY(closedir(dir));
789
free_plugin_list(plugin_list);
790
791
closedir(dir);
979
792
dir = NULL;
980
free_plugin(getplugin(NULL));
981
982
for(plugin *p = plugin_list; p != NULL; p = p->next){
983
if(p->pid != 0){
984
break;
985
}
986
if(p->next == NULL){
987
fprintf(stderr, "No plugin processes started. Incorrect plugin"
988
" directory?\n");
989
free_plugin_list();
990
}
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
process_list = NULL;
991
798
}
992
993
/* Main loop while running plugins exist */
994
while(plugin_list){
799
while(process_list){
995
800
fd_set rfds = rfds_all;
996
801
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
997
if(select_ret == -1 and errno != EINTR){
802
if (select_ret == -1){
998
803
perror("select");
999
804
exitstatus = EXIT_FAILURE;
1000
805
goto fallback;
1001
806
}
1002
807
/* OK, now either a process completed, or something can be read
1003
808
from one of them */
1004
for(plugin *proc = plugin_list; proc != NULL;){
809
for(process *proc = process_list; proc ; proc = proc->next){
1005
810
/* Is this process completely done? */
1006
if(proc->completed and proc->eof){
811
if(proc->eof and proc->completed){
1007
812
/* Only accept the plugin output if it exited cleanly */
1008
813
if(not WIFEXITED(proc->status)
1009
814
or WEXITSTATUS(proc->status) != 0){
1010
815
/* Bad exit by plugin */
1011
1012
816
if(debug){
1013
817
if(WIFEXITED(proc->status)){
1014
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1015
" status %d\n", proc->name,
1016
(intmax_t) (proc->pid),
818
fprintf(stderr, "Plugin %u exited with status %d\n",
819
(unsigned int) (proc->pid),
1017
820
WEXITSTATUS(proc->status));
1018
} else if(WIFSIGNALED(proc->status)){
1019
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1020
" signal %d: %s\n", proc->name,
1021
(intmax_t) (proc->pid),
1022
WTERMSIG(proc->status),
1023
strsignal(WTERMSIG(proc->status)));
821
} else if(WIFSIGNALED(proc->status)) {
822
fprintf(stderr, "Plugin %u killed by signal %d\n",
823
(unsigned int) (proc->pid),
824
WTERMSIG(proc->status));
1024
825
} else if(WCOREDUMP(proc->status)){
1025
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1026
" core\n", proc->name, (intmax_t) (proc->pid));
826
fprintf(stderr, "Plugin %d dumped core\n",
827
(unsigned int) (proc->pid));
1027
828
}
1028
829
}
1029
1030
830
/* Remove the plugin */
1031
831
FD_CLR(proc->fd, &rfds_all);
1032
1033
832
/* Block signal while modifying process_list */
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1035
(SIG_BLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1038
834
if(ret < 0){
1039
835
perror("sigprocmask");
1040
836
exitstatus = EXIT_FAILURE;
1041
837
goto fallback;
1042
838
}
1043
1044
plugin *next_plugin = proc->next;
1045
free_plugin(proc);
1046
proc = next_plugin;
1047
839
/* Delete this process entry from the list */
840
if(process_list == proc){
841
/* First one - simple */
842
process_list = proc->next;
843
} else {
844
/* Second one or later */
845
for(process *p = process_list; p != NULL; p = p->next){
846
if(p->next == proc){
847
p->next = proc->next;
848
break;
849
}
850
}
851
}
1048
852
/* We are done modifying process list, so unblock signal */
1049
ret = (int)(TEMP_FAILURE_RETRY
1050
(sigprocmask(SIG_UNBLOCK,
1051
&sigchld_action.sa_mask, NULL)));
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
854
NULL);
1052
855
if(ret < 0){
1053
856
perror("sigprocmask");
1054
exitstatus = EXIT_FAILURE;
1055
goto fallback;
1056
}
1057
1058
if(plugin_list == NULL){
1059
break;
1060
}
1061
1062
continue;
857
}
858
free(proc->buffer);
859
free(proc);
860
/* We deleted this process from the list, so we can't go
861
proc->next. Therefore, start over from the beginning of
862
the process list */
863
break;
1063
864
}
1064
1065
865
/* This process exited nicely, so print its buffer */
1066
1067
bool bret = print_out_password(proc->buffer,
1068
proc->buffer_length);
866
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1069
868
if(not bret){
1070
869
perror("print_out_password");
1071
870
exitstatus = EXIT_FAILURE;
1072
871
}
1073
872
goto fallback;
1074
873
}
1075
1076
874
/* This process has not completed. Does it have any output? */
1077
875
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1078
876
/* This process had nothing to say at this time */
1079
proc = proc->next;
1080
877
continue;
1081
878
}
1082
879
/* Before reading, make the process' data buffer large enough */
1083
880
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1084
881
proc->buffer = realloc(proc->buffer, proc->buffer_size
1085
882
+ (size_t) BUFFER_SIZE);
1086
if(proc->buffer == NULL){
883
if (proc->buffer == NULL){
1087
884
perror("malloc");
1088
885
exitstatus = EXIT_FAILURE;
1089
886
goto fallback;
1091
888
proc->buffer_size += BUFFER_SIZE;
1092
889
}
1093
890
/* Read from the process */
1094
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1095
proc->buffer
1096
+ proc->buffer_length,
1097
BUFFER_SIZE));
1098
if(sret < 0){
891
ret = read(proc->fd, proc->buffer + proc->buffer_length,
892
BUFFER_SIZE);
893
if(ret < 0){
1099
894
/* Read error from this process; ignore the error */
1100
proc = proc->next;
1101
895
continue;
1102
896
}
1103
if(sret == 0){
897
if(ret == 0){
1104
898
/* got EOF */
1105
899
proc->eof = true;
1106
900
} else {
1107
proc->buffer_length += (size_t) sret;
901
proc->buffer_length += (size_t) ret;
1108
902
}
1109
903
}
1110
904
}
1111
1112
905
906
1113
907
fallback:
1114
908
1115
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1116
/* Fallback if all plugins failed, none are found or an error
1117
occured */
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1118
911
bool bret;
1119
912
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1120
913
char *passwordbuffer = getpass("Password: ");
1121
size_t len = strlen(passwordbuffer);
1122
/* Strip trailing newline */
1123
if(len > 0 and passwordbuffer[len-1] == '\n'){
1124
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1125
len--;
1126
}
1127
bret = print_out_password(passwordbuffer, len);
914
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1128
915
if(not bret){
1129
916
perror("print_out_password");
1130
917
exitstatus = EXIT_FAILURE;
1137
924
perror("sigaction");
1138
925
exitstatus = EXIT_FAILURE;
1139
926
}
1140
927
1141
928
if(custom_argv != NULL){
1142
for(char **arg = custom_argv+1; *arg != NULL; arg++){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1143
930
free(*arg);
1144
931
}
1145
932
free(custom_argv);
1146
933
}
934
free_plugin_list(plugin_list);
1147
935
1148
936
if(dir != NULL){
1149
937
closedir(dir);
1150
938
}
1151
939
1152
/* Kill the processes */
1153
for(plugin *p = plugin_list; p != NULL; p = p->next){
1154
if(p->pid != 0){
1155
close(p->fd);
1156
ret = kill(p->pid, SIGTERM);
1157
if(ret == -1 and errno != ESRCH){
1158
/* Set-uid proccesses might not get closed */
1159
perror("kill");
1160
}
940
/* Free the process list and kill the processes */
941
for(process *next; process_list != NULL; process_list = next){
942
next = process_list->next;
943
close(process_list->fd);
944
ret = kill(process_list->pid, SIGTERM);
945
if(ret == -1 and errno != ESRCH){
946
/* set-uid proccesses migth not get closed */
947
perror("kill");
1161
948
}
949
free(process_list->buffer);
950
free(process_list);
1162
951
}
1163
952
1164
953
/* Wait for any remaining child processes to terminate */
1165
do {
954
do{
1166
955
ret = wait(NULL);
1167
956
} while(ret >= 0);
1168
957
if(errno != ECHILD){
1169
958
perror("wait");
1170
959
}
1171
960
1172
free_plugin_list();
1173
1174
free(plugindir);
1175
free(argfile);
1176
1177
961
return exitstatus;
1178
962
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0