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- Committer: Teddy Hogeborn
- Date: 2009-09-08 06:28:20 UTC
- Revision ID: teddy@fukt.bsnet.se-20090908062820-xgkdkrnvuze9vc72
* debian/mandos-client.README.Debian: Improved wording and formatting.
Updated location of nfsroot.txt.
* debian/mandos.README.Debian: Improved wording and formatting.
Updated location of nfsroot.txt.
* debian/mandos.README.Debian: Improved wording and formatting.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- plugins.d/usplash
- 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 © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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
27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
32
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
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
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
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() */
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() */
65
71
66
72
#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";
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;
70
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
79
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
86
80
typedef struct plugin{
87
81
char *name; /* can be NULL or any plugin name */
88
82
char **argv;
90
84
char **environ;
91
85
int envc;
92
86
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;
93
97
struct plugin *next;
94
98
} plugin;
95
99
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))){
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))){
100
109
return p;
101
110
}
102
111
}
103
112
/* Create a new plugin */
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){
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);
121
141
free(new_plugin);
122
142
return NULL;
123
143
}
124
144
new_plugin->argv[0] = copy_name;
125
145
new_plugin->argv[1] = NULL;
126
127
new_plugin->environ = malloc(sizeof(char *));
146
147
do {
148
new_plugin->environ = malloc(sizeof(char *));
149
} while(new_plugin->environ == NULL and errno == EINTR);
128
150
if(new_plugin->environ == NULL){
151
free(copy_name);
129
152
free(new_plugin->argv);
130
153
free(new_plugin);
131
154
return NULL;
132
155
}
133
156
new_plugin->environ[0] = NULL;
157
134
158
/* Append the new plugin to the list */
135
*plugin_list = new_plugin;
159
plugin_list = new_plugin;
136
160
return new_plugin;
137
161
}
138
162
140
164
static bool add_to_char_array(const char *new, char ***array,
141
165
int *len){
142
166
/* Resize the pointed-to array to hold one more pointer */
143
*array = realloc(*array, sizeof(char *)
144
* (size_t) ((*len) + 2));
167
do {
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
145
171
/* Malloc check */
146
172
if(*array == NULL){
147
173
return false;
148
174
}
149
175
/* Make a copy of the new string */
150
char *copy = strdup(new);
176
char *copy;
177
do {
178
copy = strdup(new);
179
} while(copy == NULL and errno == EINTR);
151
180
if(copy == NULL){
152
181
return false;
153
182
}
168
197
}
169
198
170
199
/* Add to a plugin's environment */
171
static bool add_environment(plugin *p, const char *def){
200
static bool add_environment(plugin *p, const char *def, bool replace){
172
201
if(p == NULL){
173
202
return false;
174
203
}
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
}
175
224
return add_to_char_array(def, &(p->environ), &(p->envc));
176
225
}
177
226
178
179
227
/*
180
228
* Based on the example in the GNU LibC manual chapter 13.13 "File
181
229
* Descriptor Flags".
182
* *Note File Descriptor Flags:(libc)Descriptor Flags.
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
183
231
*/
184
static int set_cloexec_flag(int fd)
185
{
186
int ret = fcntl(fd, F_GETFD, 0);
232
static int set_cloexec_flag(int fd){
233
int ret = TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
187
234
/* If reading the flags failed, return error indication now. */
188
235
if(ret < 0){
189
236
return ret;
190
237
}
191
238
/* Store modified flag word in the descriptor. */
192
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
239
return TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD, ret | FD_CLOEXEC));
193
240
}
194
241
195
process *process_list = NULL;
196
242
197
/* Mark a process as completed when it exits, and save its exit
243
/* Mark processes as completed when they exit, and save their exit
198
244
status. */
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;
245
static void handle_sigchld(__attribute__((unused)) int sig){
246
int old_errno = errno;
247
while(true){
248
plugin *proc = plugin_list;
249
int status;
250
pid_t pid = waitpid(-1, &status, WNOHANG);
251
if(pid == 0){
252
/* Only still running child processes */
253
break;
254
}
255
if(pid == -1){
256
if(errno == ECHILD){
257
/* No child processes */
258
break;
259
}
260
perror("waitpid");
261
}
262
263
/* A child exited, find it in process_list */
264
while(proc != NULL and proc->pid != pid){
265
proc = proc->next;
266
}
267
if(proc == NULL){
268
/* Process not found in process list */
269
continue;
270
}
271
proc->status = status;
272
proc->completed = 1;
273
}
274
errno = old_errno;
216
275
}
217
276
218
bool print_out_password(const char *buffer, size_t length){
277
/* Prints out a password to stdout */
278
static bool print_out_password(const char *buffer, size_t length){
219
279
ssize_t ret;
220
if(length>0 and buffer[length-1] == '\n'){
221
length--;
222
}
223
280
for(size_t written = 0; written < length; written += (size_t)ret){
224
281
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
225
282
length - written));
230
287
return true;
231
288
}
232
289
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;
290
/* Removes and free a plugin from the plugin list */
291
static void free_plugin(plugin *plugin_node){
292
293
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
294
free(*arg);
295
}
296
free(plugin_node->argv);
297
for(char **env = plugin_node->environ; *env != NULL; env++){
298
free(*env);
299
}
300
free(plugin_node->environ);
301
free(plugin_node->buffer);
302
303
/* Removes the plugin from the singly-linked list */
304
if(plugin_node == plugin_list){
305
/* First one - simple */
306
plugin_list = plugin_list->next;
307
} else {
308
/* Second one or later */
309
for(plugin *p = plugin_list; p != NULL; p = p->next){
310
if(p->next == plugin_node){
311
p->next = plugin_node->next;
312
break;
313
}
239
314
}
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;
315
}
316
317
free(plugin_node);
252
318
}
253
319
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
}
320
static void free_plugin_list(void){
321
while(plugin_list != NULL){
322
free_plugin(plugin_list);
323
}
268
324
}
269
325
270
326
int main(int argc, char *argv[]){
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
327
char *plugindir = NULL;
328
char *argfile = NULL;
273
329
FILE *conffp;
274
330
size_t d_name_len;
275
331
DIR *dir = NULL;
277
333
struct stat st;
278
334
fd_set rfds_all;
279
335
int ret, maxfd = 0;
336
ssize_t sret;
280
337
uid_t uid = 65534;
281
338
gid_t gid = 65534;
282
339
bool debug = false;
298
355
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
299
356
if(ret == -1){
300
357
perror("sigaction");
301
exitstatus = EXIT_FAILURE;
358
exitstatus = EXIT_FAILURE;
302
359
goto fallback;
303
360
}
304
361
307
364
{ .name = "global-options", .key = 'g',
308
365
.arg = "OPTION[,OPTION[,...]]",
309
366
.doc = "Options passed to all plugins" },
310
{ .name = "global-envs", .key = 'e',
367
{ .name = "global-env", .key = 'G',
311
368
.arg = "VAR=value",
312
369
.doc = "Environment variable passed to all plugins" },
313
370
{ .name = "options-for", .key = 'o',
314
371
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
315
372
.doc = "Options passed only to specified plugin" },
316
{ .name = "envs-for", .key = 'f',
373
{ .name = "env-for", .key = 'E',
317
374
.arg = "PLUGIN:ENV=value",
318
375
.doc = "Environment variable passed to specified plugin" },
319
376
{ .name = "disable", .key = 'd',
320
377
.arg = "PLUGIN",
321
378
.doc = "Disable a specific plugin", .group = 1 },
379
{ .name = "enable", .key = 'e',
380
.arg = "PLUGIN",
381
.doc = "Enable a specific plugin", .group = 1 },
322
382
{ .name = "plugin-dir", .key = 128,
323
383
.arg = "DIRECTORY",
324
384
.doc = "Specify a different plugin directory", .group = 2 },
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 },
385
{ .name = "config-file", .key = 129,
386
.arg = "FILE",
387
.doc = "Specify a different configuration file", .group = 2 },
388
{ .name = "userid", .key = 130,
389
.arg = "ID", .flags = 0,
390
.doc = "User ID the plugins will run as", .group = 3 },
391
{ .name = "groupid", .key = 131,
392
.arg = "ID", .flags = 0,
393
.doc = "Group ID the plugins will run as", .group = 3 },
394
{ .name = "debug", .key = 132,
395
.doc = "Debug mode", .group = 4 },
333
396
{ .name = NULL }
334
397
};
335
398
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'){
399
error_t parse_opt(int key, char *arg, __attribute__((unused))
400
struct argp_state *state){
401
switch(key){
402
char *tmp;
403
intmax_t tmpmax;
404
case 'g': /* --global-options */
405
if(arg != NULL){
406
char *plugin_option;
407
while((plugin_option = strsep(&arg, ",")) != NULL){
408
if(plugin_option[0] == '\0'){
346
409
continue;
347
410
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
411
if(not add_argument(getplugin(NULL), plugin_option)){
349
412
perror("add_argument");
350
413
return ARGP_ERR_UNKNOWN;
351
414
}
352
415
}
353
416
}
354
417
break;
355
case 'e':
418
case 'G': /* --global-env */
356
419
if(arg == NULL){
357
420
break;
358
421
}
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
}
422
if(not add_environment(getplugin(NULL), arg, true)){
423
perror("add_environment");
367
424
}
368
425
break;
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
}
426
case 'o': /* --options-for */
427
if(arg != NULL){
428
char *plugin_name = strsep(&arg, ":");
429
if(plugin_name[0] == '\0'){
430
break;
431
}
432
char *plugin_option;
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(plugin_name), plugin_option)){
435
perror("add_argument");
436
return ARGP_ERR_UNKNOWN;
389
437
}
390
438
}
391
439
}
392
440
break;
393
case 'f':
441
case 'E': /* --env-for */
394
442
if(arg == NULL){
395
443
break;
396
444
}
399
447
if(envdef == NULL){
400
448
break;
401
449
}
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)){
450
*envdef = '\0';
451
if(not add_environment(getplugin(arg), envdef+1, true)){
408
452
perror("add_environment");
409
453
}
410
454
}
411
455
break;
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
456
case 'd': /* --disable */
457
if(arg != NULL){
458
plugin *p = getplugin(arg);
415
459
if(p == NULL){
416
460
return ARGP_ERR_UNKNOWN;
417
461
}
418
462
p->disabled = true;
419
463
}
420
464
break;
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:
465
case 'e': /* --enable */
466
if(arg != NULL){
467
plugin *p = getplugin(arg);
468
if(p == NULL){
469
return ARGP_ERR_UNKNOWN;
470
}
471
p->disabled = false;
472
}
473
break;
474
case 128: /* --plugin-dir */
475
free(plugindir);
476
plugindir = strdup(arg);
477
if(plugindir == NULL){
478
perror("strdup");
479
}
480
break;
481
case 129: /* --config-file */
482
/* This is already done by parse_opt_config_file() */
483
break;
484
case 130: /* --userid */
485
errno = 0;
486
tmpmax = strtoimax(arg, &tmp, 10);
487
if(errno != 0 or tmp == arg or *tmp != '\0'
488
or tmpmax != (uid_t)tmpmax){
489
fprintf(stderr, "Bad user ID number: \"%s\", using %"
490
PRIdMAX "\n", arg, (intmax_t)uid);
491
} else {
492
uid = (uid_t)tmpmax;
493
}
494
break;
495
case 131: /* --groupid */
496
errno = 0;
497
tmpmax = strtoimax(arg, &tmp, 10);
498
if(errno != 0 or tmp == arg or *tmp != '\0'
499
or tmpmax != (gid_t)tmpmax){
500
fprintf(stderr, "Bad group ID number: \"%s\", using %"
501
PRIdMAX "\n", arg, (intmax_t)gid);
502
} else {
503
gid = (gid_t)tmpmax;
504
}
505
break;
506
case 132: /* --debug */
431
507
debug = true;
432
508
break;
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]",
509
/*
510
* When adding more options before this line, remember to also add a
511
* "case" to the "parse_opt_config_file" function below.
512
*/
513
case ARGP_KEY_ARG:
514
/* Cryptsetup always passes an argument, which is an empty
515
string if "none" was specified in /etc/crypttab. So if
516
argument was empty, we ignore it silently. */
517
if(arg[0] != '\0'){
518
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
519
}
520
break;
521
case ARGP_KEY_END:
522
break;
523
default:
524
return ARGP_ERR_UNKNOWN;
525
}
526
return 0;
527
}
528
529
/* This option parser is the same as parse_opt() above, except it
530
ignores everything but the --config-file option. */
531
error_t parse_opt_config_file(int key, char *arg,
532
__attribute__((unused))
533
struct argp_state *state){
534
switch(key){
535
case 'g': /* --global-options */
536
case 'G': /* --global-env */
537
case 'o': /* --options-for */
538
case 'E': /* --env-for */
539
case 'd': /* --disable */
540
case 'e': /* --enable */
541
case 128: /* --plugin-dir */
542
break;
543
case 129: /* --config-file */
544
free(argfile);
545
argfile = strdup(arg);
546
if(argfile == NULL){
547
perror("strdup");
548
}
549
break;
550
case 130: /* --userid */
551
case 131: /* --groupid */
552
case 132: /* --debug */
553
case ARGP_KEY_ARG:
554
case ARGP_KEY_END:
555
break;
556
default:
557
return ARGP_ERR_UNKNOWN;
558
}
559
return 0;
560
}
561
562
struct argp argp = { .options = options,
563
.parser = parse_opt_config_file,
564
.args_doc = "",
448
565
.doc = "Mandos plugin runner -- Run plugins" };
449
566
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
451
if (ret == ARGP_ERR_UNKNOWN){
567
/* Parse using parse_opt_config_file() in order to get the custom
568
config file location, if any. */
569
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
570
if(ret == ARGP_ERR_UNKNOWN){
452
571
fprintf(stderr, "Unknown error while parsing arguments\n");
453
572
exitstatus = EXIT_FAILURE;
454
573
goto fallback;
455
574
}
456
457
conffp = fopen(argfile, "r");
575
576
/* Reset to the normal argument parser */
577
argp.parser = parse_opt;
578
579
/* Open the configfile if available */
580
if(argfile == NULL){
581
conffp = fopen(AFILE, "r");
582
} else {
583
conffp = fopen(argfile, "r");
584
}
458
585
if(conffp != NULL){
459
586
char *org_line = NULL;
460
587
char *p, *arg, *new_arg, *line;
461
588
size_t size = 0;
462
ssize_t sret;
463
589
const char whitespace_delims[] = " \r\t\f\v\n";
464
590
const char comment_delim[] = "#";
465
591
592
custom_argc = 1;
593
custom_argv = malloc(sizeof(char*) * 2);
594
if(custom_argv == NULL){
595
perror("malloc");
596
exitstatus = EXIT_FAILURE;
597
goto fallback;
598
}
599
custom_argv[0] = argv[0];
600
custom_argv[1] = NULL;
601
602
/* for each line in the config file, strip whitespace and ignore
603
commented text */
466
604
while(true){
467
605
sret = getline(&org_line, &size, conffp);
468
606
if(sret == -1){
469
607
break;
470
608
}
471
609
472
610
line = org_line;
473
611
arg = strsep(&line, comment_delim);
474
612
while((p = strsep(&arg, whitespace_delims)) != NULL){
476
614
continue;
477
615
}
478
616
new_arg = strdup(p);
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
}
617
if(new_arg == NULL){
618
perror("strdup");
619
exitstatus = EXIT_FAILURE;
620
free(org_line);
621
goto fallback;
622
}
623
624
custom_argc += 1;
625
custom_argv = realloc(custom_argv, sizeof(char *)
626
* ((unsigned int) custom_argc + 1));
627
if(custom_argv == NULL){
628
perror("realloc");
629
exitstatus = EXIT_FAILURE;
630
free(org_line);
631
goto fallback;
632
}
633
custom_argv[custom_argc-1] = new_arg;
634
custom_argv[custom_argc] = NULL;
485
635
}
486
636
}
637
do {
638
ret = fclose(conffp);
639
} while(ret == EOF and errno == EINTR);
640
if(ret == EOF){
641
perror("fclose");
642
exitstatus = EXIT_FAILURE;
643
goto fallback;
644
}
487
645
free(org_line);
488
} else{
646
} else {
489
647
/* Check for harmful errors and go to fallback. Other errors might
490
648
not affect opening plugins */
491
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
649
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
492
650
perror("fopen");
493
651
exitstatus = EXIT_FAILURE;
494
652
goto fallback;
495
653
}
496
654
}
497
655
/* If there was any arguments from configuration file,
656
pass them to parser as command arguments */
498
657
if(custom_argv != NULL){
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){
658
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
659
0, NULL);
660
if(ret == ARGP_ERR_UNKNOWN){
502
661
fprintf(stderr, "Unknown error while parsing arguments\n");
503
662
exitstatus = EXIT_FAILURE;
504
663
goto fallback;
505
664
}
506
665
}
507
666
667
/* Parse actual command line arguments, to let them override the
668
config file */
669
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
670
if(ret == ARGP_ERR_UNKNOWN){
671
fprintf(stderr, "Unknown error while parsing arguments\n");
672
exitstatus = EXIT_FAILURE;
673
goto fallback;
674
}
675
508
676
if(debug){
509
677
for(plugin *p = plugin_list; p != NULL; p=p->next){
510
678
fprintf(stderr, "Plugin: %s has %d arguments\n",
512
680
for(char **a = p->argv; *a != NULL; a++){
513
681
fprintf(stderr, "\tArg: %s\n", *a);
514
682
}
515
fprintf(stderr, "...and %u environment variables\n", p->envc);
683
fprintf(stderr, "...and %d environment variables\n", p->envc);
516
684
for(char **a = p->environ; *a != NULL; a++){
517
685
fprintf(stderr, "\t%s\n", *a);
518
686
}
519
687
}
520
688
}
521
689
690
/* Strip permissions down to nobody */
691
setgid(gid);
692
if(ret == -1){
693
perror("setgid");
694
}
522
695
ret = setuid(uid);
523
if (ret == -1){
696
if(ret == -1){
524
697
perror("setuid");
525
698
}
526
699
527
setgid(gid);
528
if (ret == -1){
529
perror("setgid");
700
if(plugindir == NULL){
701
dir = opendir(PDIR);
702
} else {
703
dir = opendir(plugindir);
530
704
}
531
705
532
dir = opendir(plugindir);
533
706
if(dir == NULL){
534
707
perror("Could not open plugin dir");
535
708
exitstatus = EXIT_FAILURE;
551
724
552
725
FD_ZERO(&rfds_all);
553
726
727
/* Read and execute any executable in the plugin directory*/
554
728
while(true){
555
dirst = readdir(dir);
729
do {
730
dirst = readdir(dir);
731
} while(dirst == NULL and errno == EINTR);
556
732
557
// All directory entries have been processed
733
/* All directory entries have been processed */
558
734
if(dirst == NULL){
559
if (errno == EBADF){
735
if(errno == EBADF){
560
736
perror("readdir");
561
737
exitstatus = EXIT_FAILURE;
562
738
goto fallback;
566
742
567
743
d_name_len = strlen(dirst->d_name);
568
744
569
// Ignore dotfiles, backup files and other junk
745
/* Ignore dotfiles, backup files and other junk */
570
746
{
571
747
bool bad_name = false;
572
748
574
750
575
751
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
576
752
".dpkg-old",
753
".dpkg-bak",
577
754
".dpkg-divert", NULL };
578
755
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
579
756
size_t pre_len = strlen(*pre);
587
764
break;
588
765
}
589
766
}
590
591
767
if(bad_name){
592
768
continue;
593
769
}
594
595
770
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
596
771
size_t suf_len = strlen(*suf);
597
772
if((d_name_len >= suf_len)
610
785
continue;
611
786
}
612
787
}
613
788
614
789
char *filename;
615
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
790
if(plugindir == NULL){
791
ret = TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
792
dirst->d_name));
793
} else {
794
ret = TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s", plugindir,
795
dirst->d_name));
796
}
616
797
if(ret < 0){
617
798
perror("asprintf");
618
799
continue;
619
800
}
620
801
621
ret = stat(filename, &st);
622
if (ret == -1){
802
ret = TEMP_FAILURE_RETRY(stat(filename, &st));
803
if(ret == -1){
623
804
perror("stat");
624
805
free(filename);
625
806
continue;
626
807
}
627
808
628
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
809
/* Ignore non-executable files */
810
if(not S_ISREG(st.st_mode)
811
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
629
812
if(debug){
630
813
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
631
814
" with bad type or mode\n", filename);
633
816
free(filename);
634
817
continue;
635
818
}
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
819
820
plugin *p = getplugin(dirst->d_name);
637
821
if(p == NULL){
638
822
perror("getplugin");
639
823
free(filename);
649
833
}
650
834
{
651
835
/* Add global arguments to argument list for this plugin */
652
plugin *g = getplugin(NULL, &plugin_list);
836
plugin *g = getplugin(NULL);
653
837
if(g != NULL){
654
838
for(char **a = g->argv + 1; *a != NULL; a++){
655
839
if(not add_argument(p, *a)){
658
842
}
659
843
/* Add global environment variables */
660
844
for(char **e = g->environ; *e != NULL; e++){
661
if(not add_environment(p, *e)){
845
if(not add_environment(p, *e, false)){
662
846
perror("add_environment");
663
847
}
664
848
}
669
853
process, too. */
670
854
if(p->environ[0] != NULL){
671
855
for(char **e = environ; *e != NULL; e++){
672
char *copy = strdup(*e);
673
if(copy == NULL){
674
perror("strdup");
675
continue;
676
}
677
if(not add_environment(p, copy)){
856
if(not add_environment(p, *e, false)){
678
857
perror("add_environment");
679
858
}
680
859
}
681
860
}
682
861
683
int pipefd[2];
684
ret = pipe(pipefd);
685
if (ret == -1){
862
int pipefd[2];
863
ret = TEMP_FAILURE_RETRY(pipe(pipefd));
864
if(ret == -1){
686
865
perror("pipe");
687
866
exitstatus = EXIT_FAILURE;
688
867
goto fallback;
689
868
}
869
/* Ask OS to automatic close the pipe on exec */
690
870
ret = set_cloexec_flag(pipefd[0]);
691
871
if(ret < 0){
692
872
perror("set_cloexec_flag");
700
880
goto fallback;
701
881
}
702
882
/* Block SIGCHLD until process is safely in process list */
703
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
883
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
884
&sigchld_action.sa_mask,
885
NULL));
704
886
if(ret < 0){
705
887
perror("sigprocmask");
706
888
exitstatus = EXIT_FAILURE;
707
889
goto fallback;
708
890
}
709
// Starting a new process to be watched
710
pid_t pid = fork();
891
/* Starting a new process to be watched */
892
pid_t pid;
893
do {
894
pid = fork();
895
} while(pid == -1 and errno == EINTR);
711
896
if(pid == -1){
712
897
perror("fork");
713
898
exitstatus = EXIT_FAILURE;
720
905
perror("sigaction");
721
906
_exit(EXIT_FAILURE);
722
907
}
723
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
724
909
if(ret < 0){
725
910
perror("sigprocmask");
726
911
_exit(EXIT_FAILURE);
727
912
}
728
913
729
914
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
730
915
if(ret == -1){
731
916
perror("dup2");
750
935
}
751
936
/* no return */
752
937
}
753
/* parent process */
938
/* Parent process */
939
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
940
pipe */
754
941
free(filename);
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);
942
plugin *new_plugin = getplugin(dirst->d_name);
943
if(new_plugin == NULL){
944
perror("getplugin");
945
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
946
&sigchld_action.sa_mask,
947
NULL));
760
948
if(ret < 0){
761
perror("sigprocmask");
949
perror("sigprocmask");
762
950
}
763
951
exitstatus = EXIT_FAILURE;
764
952
goto fallback;
765
953
}
766
954
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
process_list = new_process;
955
new_plugin->pid = pid;
956
new_plugin->fd = pipefd[0];
957
772
958
/* Unblock SIGCHLD so signal handler can be run if this process
773
959
has already completed */
774
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
960
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
961
&sigchld_action.sa_mask,
962
NULL));
775
963
if(ret < 0){
776
964
perror("sigprocmask");
777
965
exitstatus = EXIT_FAILURE;
778
966
goto fallback;
779
967
}
780
968
781
FD_SET(new_process->fd, &rfds_all);
969
FD_SET(new_plugin->fd, &rfds_all);
782
970
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
971
if(maxfd < new_plugin->fd){
972
maxfd = new_plugin->fd;
785
973
}
786
787
974
}
788
975
789
free_plugin_list(plugin_list);
790
791
closedir(dir);
976
TEMP_FAILURE_RETRY(closedir(dir));
792
977
dir = NULL;
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
process_list = NULL;
978
free_plugin(getplugin(NULL));
979
980
for(plugin *p = plugin_list; p != NULL; p = p->next){
981
if(p->pid != 0){
982
break;
983
}
984
if(p->next == NULL){
985
fprintf(stderr, "No plugin processes started. Incorrect plugin"
986
" directory?\n");
987
free_plugin_list();
988
}
798
989
}
799
while(process_list){
990
991
/* Main loop while running plugins exist */
992
while(plugin_list){
800
993
fd_set rfds = rfds_all;
801
994
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
802
if (select_ret == -1){
995
if(select_ret == -1 and errno != EINTR){
803
996
perror("select");
804
997
exitstatus = EXIT_FAILURE;
805
998
goto fallback;
806
999
}
807
1000
/* OK, now either a process completed, or something can be read
808
1001
from one of them */
809
for(process *proc = process_list; proc ; proc = proc->next){
1002
for(plugin *proc = plugin_list; proc != NULL;){
810
1003
/* Is this process completely done? */
811
if(proc->eof and proc->completed){
1004
if(proc->completed and proc->eof){
812
1005
/* Only accept the plugin output if it exited cleanly */
813
1006
if(not WIFEXITED(proc->status)
814
1007
or WEXITSTATUS(proc->status) != 0){
815
1008
/* Bad exit by plugin */
1009
816
1010
if(debug){
817
1011
if(WIFEXITED(proc->status)){
818
fprintf(stderr, "Plugin %u exited with status %d\n",
819
(unsigned int) (proc->pid),
1012
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1013
" status %d\n", proc->name,
1014
(intmax_t) (proc->pid),
820
1015
WEXITSTATUS(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));
1016
} else if(WIFSIGNALED(proc->status)){
1017
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1018
" signal %d: %s\n", proc->name,
1019
(intmax_t) (proc->pid),
1020
WTERMSIG(proc->status),
1021
strsignal(WTERMSIG(proc->status)));
825
1022
} else if(WCOREDUMP(proc->status)){
826
fprintf(stderr, "Plugin %d dumped core\n",
827
(unsigned int) (proc->pid));
1023
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1024
" core\n", proc->name, (intmax_t) (proc->pid));
828
1025
}
829
1026
}
1027
830
1028
/* Remove the plugin */
831
1029
FD_CLR(proc->fd, &rfds_all);
1030
832
1031
/* Block signal while modifying process_list */
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1032
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1033
&sigchld_action.sa_mask,
1034
NULL));
834
1035
if(ret < 0){
835
1036
perror("sigprocmask");
836
1037
exitstatus = EXIT_FAILURE;
837
1038
goto fallback;
838
1039
}
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
}
1040
1041
plugin *next_plugin = proc->next;
1042
free_plugin(proc);
1043
proc = next_plugin;
1044
852
1045
/* We are done modifying process list, so unblock signal */
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
854
NULL);
1046
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1047
&sigchld_action.sa_mask,
1048
NULL));
855
1049
if(ret < 0){
856
1050
perror("sigprocmask");
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;
1051
exitstatus = EXIT_FAILURE;
1052
goto fallback;
1053
}
1054
1055
if(plugin_list == NULL){
1056
break;
1057
}
1058
1059
continue;
864
1060
}
1061
865
1062
/* This process exited nicely, so print its buffer */
866
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1063
1064
bool bret = print_out_password(proc->buffer,
1065
proc->buffer_length);
868
1066
if(not bret){
869
1067
perror("print_out_password");
870
1068
exitstatus = EXIT_FAILURE;
871
1069
}
872
1070
goto fallback;
873
1071
}
1072
874
1073
/* This process has not completed. Does it have any output? */
875
1074
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
876
1075
/* This process had nothing to say at this time */
1076
proc = proc->next;
877
1077
continue;
878
1078
}
879
1079
/* Before reading, make the process' data buffer large enough */
880
1080
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
881
1081
proc->buffer = realloc(proc->buffer, proc->buffer_size
882
1082
+ (size_t) BUFFER_SIZE);
883
if (proc->buffer == NULL){
1083
if(proc->buffer == NULL){
884
1084
perror("malloc");
885
1085
exitstatus = EXIT_FAILURE;
886
1086
goto fallback;
888
1088
proc->buffer_size += BUFFER_SIZE;
889
1089
}
890
1090
/* Read from the process */
891
ret = read(proc->fd, proc->buffer + proc->buffer_length,
892
BUFFER_SIZE);
893
if(ret < 0){
1091
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1092
proc->buffer
1093
+ proc->buffer_length,
1094
BUFFER_SIZE));
1095
if(sret < 0){
894
1096
/* Read error from this process; ignore the error */
1097
proc = proc->next;
895
1098
continue;
896
1099
}
897
if(ret == 0){
1100
if(sret == 0){
898
1101
/* got EOF */
899
1102
proc->eof = true;
900
1103
} else {
901
proc->buffer_length += (size_t) ret;
1104
proc->buffer_length += (size_t) sret;
902
1105
}
903
1106
}
904
1107
}
905
906
1108
1109
907
1110
fallback:
908
1111
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1112
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1113
/* Fallback if all plugins failed, none are found or an error
1114
occured */
911
1115
bool bret;
912
1116
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
913
1117
char *passwordbuffer = getpass("Password: ");
914
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1118
size_t len = strlen(passwordbuffer);
1119
/* Strip trailing newline */
1120
if(len > 0 and passwordbuffer[len-1] == '\n'){
1121
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1122
len--;
1123
}
1124
bret = print_out_password(passwordbuffer, len);
915
1125
if(not bret){
916
1126
perror("print_out_password");
917
1127
exitstatus = EXIT_FAILURE;
924
1134
perror("sigaction");
925
1135
exitstatus = EXIT_FAILURE;
926
1136
}
927
1137
928
1138
if(custom_argv != NULL){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1139
for(char **arg = custom_argv+1; *arg != NULL; arg++){
930
1140
free(*arg);
931
1141
}
932
1142
free(custom_argv);
933
1143
}
934
free_plugin_list(plugin_list);
935
1144
936
1145
if(dir != NULL){
937
1146
closedir(dir);
938
1147
}
939
1148
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");
1149
/* Kill the processes */
1150
for(plugin *p = plugin_list; p != NULL; p = p->next){
1151
if(p->pid != 0){
1152
close(p->fd);
1153
ret = kill(p->pid, SIGTERM);
1154
if(ret == -1 and errno != ESRCH){
1155
/* Set-uid proccesses might not get closed */
1156
perror("kill");
1157
}
948
1158
}
949
free(process_list->buffer);
950
free(process_list);
951
1159
}
952
1160
953
1161
/* Wait for any remaining child processes to terminate */
954
do{
1162
do {
955
1163
ret = wait(NULL);
956
1164
} while(ret >= 0);
957
1165
if(errno != ECHILD){
958
1166
perror("wait");
959
1167
}
960
1168
1169
free_plugin_list();
1170
1171
free(plugindir);
1172
free(argfile);
1173
961
1174
return exitstatus;
962
1175
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0