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- Committer: Teddy Hogeborn
- Date: 2009-09-17 14:21:18 UTC
- mto: (24.1.142 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: teddy@fukt.bsnet.se-20090917142118-6wto8m380jhiot68
Merge from release branch.
- files added:
- .bzr-builddeb
- debian
- debian/po
- 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 © 2008,2009 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 = (int)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 (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
240
ret | FD_CLOEXEC));
193
241
}
194
242
195
process *process_list = NULL;
196
243
197
/* Mark a process as completed when it exits, and save its exit
244
/* Mark processes as completed when they exit, and save their exit
198
245
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;
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;
216
276
}
217
277
218
bool print_out_password(const char *buffer, size_t length){
278
/* Prints out a password to stdout */
279
static bool print_out_password(const char *buffer, size_t length){
219
280
ssize_t ret;
220
if(length>0 and buffer[length-1] == '\n'){
221
length--;
222
}
223
281
for(size_t written = 0; written < length; written += (size_t)ret){
224
282
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
225
283
length - written));
230
288
return true;
231
289
}
232
290
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;
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
}
239
315
}
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;
316
}
317
318
free(plugin_node);
252
319
}
253
320
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
}
321
static void free_plugin_list(void){
322
while(plugin_list != NULL){
323
free_plugin(plugin_list);
324
}
268
325
}
269
326
270
327
int main(int argc, char *argv[]){
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
328
char *plugindir = NULL;
329
char *argfile = NULL;
273
330
FILE *conffp;
274
331
size_t d_name_len;
275
332
DIR *dir = NULL;
277
334
struct stat st;
278
335
fd_set rfds_all;
279
336
int ret, maxfd = 0;
337
ssize_t sret;
280
338
uid_t uid = 65534;
281
339
gid_t gid = 65534;
282
340
bool debug = false;
298
356
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
299
357
if(ret == -1){
300
358
perror("sigaction");
301
exitstatus = EXIT_FAILURE;
359
exitstatus = EXIT_FAILURE;
302
360
goto fallback;
303
361
}
304
362
307
365
{ .name = "global-options", .key = 'g',
308
366
.arg = "OPTION[,OPTION[,...]]",
309
367
.doc = "Options passed to all plugins" },
310
{ .name = "global-envs", .key = 'e',
368
{ .name = "global-env", .key = 'G',
311
369
.arg = "VAR=value",
312
370
.doc = "Environment variable passed to all plugins" },
313
371
{ .name = "options-for", .key = 'o',
314
372
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
315
373
.doc = "Options passed only to specified plugin" },
316
{ .name = "envs-for", .key = 'f',
374
{ .name = "env-for", .key = 'E',
317
375
.arg = "PLUGIN:ENV=value",
318
376
.doc = "Environment variable passed to specified plugin" },
319
377
{ .name = "disable", .key = 'd',
320
378
.arg = "PLUGIN",
321
379
.doc = "Disable a specific plugin", .group = 1 },
380
{ .name = "enable", .key = 'e',
381
.arg = "PLUGIN",
382
.doc = "Enable a specific plugin", .group = 1 },
322
383
{ .name = "plugin-dir", .key = 128,
323
384
.arg = "DIRECTORY",
324
385
.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 },
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 },
333
397
{ .name = NULL }
334
398
};
335
399
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'){
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'){
346
410
continue;
347
411
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
412
if(not add_argument(getplugin(NULL), plugin_option)){
349
413
perror("add_argument");
350
414
return ARGP_ERR_UNKNOWN;
351
415
}
352
416
}
353
417
}
354
418
break;
355
case 'e':
419
case 'G': /* --global-env */
356
420
if(arg == NULL){
357
421
break;
358
422
}
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
}
423
if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
367
425
}
368
426
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
}
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;
389
438
}
390
439
}
391
440
}
392
441
break;
393
case 'f':
442
case 'E': /* --env-for */
394
443
if(arg == NULL){
395
444
break;
396
445
}
399
448
if(envdef == NULL){
400
449
break;
401
450
}
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)){
451
*envdef = '\0';
452
if(not add_environment(getplugin(arg), envdef+1, true)){
408
453
perror("add_environment");
409
454
}
410
455
}
411
456
break;
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
457
case 'd': /* --disable */
458
if(arg != NULL){
459
plugin *p = getplugin(arg);
415
460
if(p == NULL){
416
461
return ARGP_ERR_UNKNOWN;
417
462
}
418
463
p->disabled = true;
419
464
}
420
465
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:
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 */
431
508
debug = true;
432
509
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]",
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 = "",
448
566
.doc = "Mandos plugin runner -- Run plugins" };
449
567
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
451
if (ret == ARGP_ERR_UNKNOWN){
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){
452
572
fprintf(stderr, "Unknown error while parsing arguments\n");
453
573
exitstatus = EXIT_FAILURE;
454
574
goto fallback;
455
575
}
456
457
conffp = fopen(argfile, "r");
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
}
458
586
if(conffp != NULL){
459
587
char *org_line = NULL;
460
588
char *p, *arg, *new_arg, *line;
461
589
size_t size = 0;
462
ssize_t sret;
463
590
const char whitespace_delims[] = " \r\t\f\v\n";
464
591
const char comment_delim[] = "#";
465
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 */
466
605
while(true){
467
606
sret = getline(&org_line, &size, conffp);
468
607
if(sret == -1){
469
608
break;
470
609
}
471
610
472
611
line = org_line;
473
612
arg = strsep(&line, comment_delim);
474
613
while((p = strsep(&arg, whitespace_delims)) != NULL){
476
615
continue;
477
616
}
478
617
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
}
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;
485
636
}
486
637
}
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
}
487
646
free(org_line);
488
} else{
647
} else {
489
648
/* Check for harmful errors and go to fallback. Other errors might
490
649
not affect opening plugins */
491
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
650
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
492
651
perror("fopen");
493
652
exitstatus = EXIT_FAILURE;
494
653
goto fallback;
495
654
}
496
655
}
497
656
/* If there was any arguments from configuration file,
657
pass them to parser as command arguments */
498
658
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){
659
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
660
0, NULL);
661
if(ret == ARGP_ERR_UNKNOWN){
502
662
fprintf(stderr, "Unknown error while parsing arguments\n");
503
663
exitstatus = EXIT_FAILURE;
504
664
goto fallback;
505
665
}
506
666
}
507
667
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
508
677
if(debug){
509
678
for(plugin *p = plugin_list; p != NULL; p=p->next){
510
679
fprintf(stderr, "Plugin: %s has %d arguments\n",
512
681
for(char **a = p->argv; *a != NULL; a++){
513
682
fprintf(stderr, "\tArg: %s\n", *a);
514
683
}
515
fprintf(stderr, "...and %u environment variables\n", p->envc);
684
fprintf(stderr, "...and %d environment variables\n", p->envc);
516
685
for(char **a = p->environ; *a != NULL; a++){
517
686
fprintf(stderr, "\t%s\n", *a);
518
687
}
519
688
}
520
689
}
521
690
691
/* Strip permissions down to nobody */
692
setgid(gid);
693
if(ret == -1){
694
perror("setgid");
695
}
522
696
ret = setuid(uid);
523
if (ret == -1){
697
if(ret == -1){
524
698
perror("setuid");
525
699
}
526
700
527
setgid(gid);
528
if (ret == -1){
529
perror("setgid");
701
if(plugindir == NULL){
702
dir = opendir(PDIR);
703
} else {
704
dir = opendir(plugindir);
530
705
}
531
706
532
dir = opendir(plugindir);
533
707
if(dir == NULL){
534
708
perror("Could not open plugin dir");
535
709
exitstatus = EXIT_FAILURE;
551
725
552
726
FD_ZERO(&rfds_all);
553
727
728
/* Read and execute any executable in the plugin directory*/
554
729
while(true){
555
dirst = readdir(dir);
730
do {
731
dirst = readdir(dir);
732
} while(dirst == NULL and errno == EINTR);
556
733
557
// All directory entries have been processed
734
/* All directory entries have been processed */
558
735
if(dirst == NULL){
559
if (errno == EBADF){
736
if(errno == EBADF){
560
737
perror("readdir");
561
738
exitstatus = EXIT_FAILURE;
562
739
goto fallback;
566
743
567
744
d_name_len = strlen(dirst->d_name);
568
745
569
// Ignore dotfiles, backup files and other junk
746
/* Ignore dotfiles, backup files and other junk */
570
747
{
571
748
bool bad_name = false;
572
749
574
751
575
752
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
576
753
".dpkg-old",
754
".dpkg-bak",
577
755
".dpkg-divert", NULL };
578
756
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
579
757
size_t pre_len = strlen(*pre);
587
765
break;
588
766
}
589
767
}
590
591
768
if(bad_name){
592
769
continue;
593
770
}
594
595
771
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
596
772
size_t suf_len = strlen(*suf);
597
773
if((d_name_len >= suf_len)
610
786
continue;
611
787
}
612
788
}
613
789
614
790
char *filename;
615
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
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
}
616
799
if(ret < 0){
617
800
perror("asprintf");
618
801
continue;
619
802
}
620
803
621
ret = stat(filename, &st);
622
if (ret == -1){
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
805
if(ret == -1){
623
806
perror("stat");
624
807
free(filename);
625
808
continue;
626
809
}
627
810
628
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
811
/* Ignore non-executable files */
812
if(not S_ISREG(st.st_mode)
813
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
629
814
if(debug){
630
815
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
631
816
" with bad type or mode\n", filename);
633
818
free(filename);
634
819
continue;
635
820
}
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
821
822
plugin *p = getplugin(dirst->d_name);
637
823
if(p == NULL){
638
824
perror("getplugin");
639
825
free(filename);
649
835
}
650
836
{
651
837
/* Add global arguments to argument list for this plugin */
652
plugin *g = getplugin(NULL, &plugin_list);
838
plugin *g = getplugin(NULL);
653
839
if(g != NULL){
654
840
for(char **a = g->argv + 1; *a != NULL; a++){
655
841
if(not add_argument(p, *a)){
658
844
}
659
845
/* Add global environment variables */
660
846
for(char **e = g->environ; *e != NULL; e++){
661
if(not add_environment(p, *e)){
847
if(not add_environment(p, *e, false)){
662
848
perror("add_environment");
663
849
}
664
850
}
669
855
process, too. */
670
856
if(p->environ[0] != NULL){
671
857
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)){
858
if(not add_environment(p, *e, false)){
678
859
perror("add_environment");
679
860
}
680
861
}
681
862
}
682
863
683
int pipefd[2];
684
ret = pipe(pipefd);
685
if (ret == -1){
864
int pipefd[2];
865
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
866
if(ret == -1){
686
867
perror("pipe");
687
868
exitstatus = EXIT_FAILURE;
688
869
goto fallback;
689
870
}
871
/* Ask OS to automatic close the pipe on exec */
690
872
ret = set_cloexec_flag(pipefd[0]);
691
873
if(ret < 0){
692
874
perror("set_cloexec_flag");
700
882
goto fallback;
701
883
}
702
884
/* Block SIGCHLD until process is safely in process list */
703
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
885
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
886
&sigchld_action.sa_mask,
887
NULL));
704
888
if(ret < 0){
705
889
perror("sigprocmask");
706
890
exitstatus = EXIT_FAILURE;
707
891
goto fallback;
708
892
}
709
// Starting a new process to be watched
710
pid_t pid = fork();
893
/* Starting a new process to be watched */
894
pid_t pid;
895
do {
896
pid = fork();
897
} while(pid == -1 and errno == EINTR);
711
898
if(pid == -1){
712
899
perror("fork");
713
900
exitstatus = EXIT_FAILURE;
720
907
perror("sigaction");
721
908
_exit(EXIT_FAILURE);
722
909
}
723
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
724
911
if(ret < 0){
725
912
perror("sigprocmask");
726
913
_exit(EXIT_FAILURE);
727
914
}
728
915
729
916
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
730
917
if(ret == -1){
731
918
perror("dup2");
750
937
}
751
938
/* no return */
752
939
}
753
/* parent process */
940
/* Parent process */
941
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
942
pipe */
754
943
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);
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)));
760
950
if(ret < 0){
761
perror("sigprocmask");
951
perror("sigprocmask");
762
952
}
763
953
exitstatus = EXIT_FAILURE;
764
954
goto fallback;
765
955
}
766
956
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
process_list = new_process;
957
new_plugin->pid = pid;
958
new_plugin->fd = pipefd[0];
959
772
960
/* Unblock SIGCHLD so signal handler can be run if this process
773
961
has already completed */
774
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
962
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
963
&sigchld_action.sa_mask,
964
NULL));
775
965
if(ret < 0){
776
966
perror("sigprocmask");
777
967
exitstatus = EXIT_FAILURE;
778
968
goto fallback;
779
969
}
780
970
781
FD_SET(new_process->fd, &rfds_all);
971
FD_SET(new_plugin->fd, &rfds_all);
782
972
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
973
if(maxfd < new_plugin->fd){
974
maxfd = new_plugin->fd;
785
975
}
786
787
976
}
788
977
789
free_plugin_list(plugin_list);
790
791
closedir(dir);
978
TEMP_FAILURE_RETRY(closedir(dir));
792
979
dir = NULL;
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
process_list = 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
}
798
991
}
799
while(process_list){
992
993
/* Main loop while running plugins exist */
994
while(plugin_list){
800
995
fd_set rfds = rfds_all;
801
996
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
802
if (select_ret == -1){
997
if(select_ret == -1 and errno != EINTR){
803
998
perror("select");
804
999
exitstatus = EXIT_FAILURE;
805
1000
goto fallback;
806
1001
}
807
1002
/* OK, now either a process completed, or something can be read
808
1003
from one of them */
809
for(process *proc = process_list; proc ; proc = proc->next){
1004
for(plugin *proc = plugin_list; proc != NULL;){
810
1005
/* Is this process completely done? */
811
if(proc->eof and proc->completed){
1006
if(proc->completed and proc->eof){
812
1007
/* Only accept the plugin output if it exited cleanly */
813
1008
if(not WIFEXITED(proc->status)
814
1009
or WEXITSTATUS(proc->status) != 0){
815
1010
/* Bad exit by plugin */
1011
816
1012
if(debug){
817
1013
if(WIFEXITED(proc->status)){
818
fprintf(stderr, "Plugin %u exited with status %d\n",
819
(unsigned int) (proc->pid),
1014
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1015
" status %d\n", proc->name,
1016
(intmax_t) (proc->pid),
820
1017
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));
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)));
825
1024
} else if(WCOREDUMP(proc->status)){
826
fprintf(stderr, "Plugin %d dumped core\n",
827
(unsigned int) (proc->pid));
1025
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1026
" core\n", proc->name, (intmax_t) (proc->pid));
828
1027
}
829
1028
}
1029
830
1030
/* Remove the plugin */
831
1031
FD_CLR(proc->fd, &rfds_all);
1032
832
1033
/* Block signal while modifying process_list */
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1035
(SIG_BLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
834
1038
if(ret < 0){
835
1039
perror("sigprocmask");
836
1040
exitstatus = EXIT_FAILURE;
837
1041
goto fallback;
838
1042
}
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
}
1043
1044
plugin *next_plugin = proc->next;
1045
free_plugin(proc);
1046
proc = next_plugin;
1047
852
1048
/* We are done modifying process list, so unblock signal */
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
854
NULL);
1049
ret = (int)(TEMP_FAILURE_RETRY
1050
(sigprocmask(SIG_UNBLOCK,
1051
&sigchld_action.sa_mask, NULL)));
855
1052
if(ret < 0){
856
1053
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;
1054
exitstatus = EXIT_FAILURE;
1055
goto fallback;
1056
}
1057
1058
if(plugin_list == NULL){
1059
break;
1060
}
1061
1062
continue;
864
1063
}
1064
865
1065
/* This process exited nicely, so print its buffer */
866
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1066
1067
bool bret = print_out_password(proc->buffer,
1068
proc->buffer_length);
868
1069
if(not bret){
869
1070
perror("print_out_password");
870
1071
exitstatus = EXIT_FAILURE;
871
1072
}
872
1073
goto fallback;
873
1074
}
1075
874
1076
/* This process has not completed. Does it have any output? */
875
1077
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
876
1078
/* This process had nothing to say at this time */
1079
proc = proc->next;
877
1080
continue;
878
1081
}
879
1082
/* Before reading, make the process' data buffer large enough */
880
1083
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
881
1084
proc->buffer = realloc(proc->buffer, proc->buffer_size
882
1085
+ (size_t) BUFFER_SIZE);
883
if (proc->buffer == NULL){
1086
if(proc->buffer == NULL){
884
1087
perror("malloc");
885
1088
exitstatus = EXIT_FAILURE;
886
1089
goto fallback;
888
1091
proc->buffer_size += BUFFER_SIZE;
889
1092
}
890
1093
/* Read from the process */
891
ret = read(proc->fd, proc->buffer + proc->buffer_length,
892
BUFFER_SIZE);
893
if(ret < 0){
1094
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1095
proc->buffer
1096
+ proc->buffer_length,
1097
BUFFER_SIZE));
1098
if(sret < 0){
894
1099
/* Read error from this process; ignore the error */
1100
proc = proc->next;
895
1101
continue;
896
1102
}
897
if(ret == 0){
1103
if(sret == 0){
898
1104
/* got EOF */
899
1105
proc->eof = true;
900
1106
} else {
901
proc->buffer_length += (size_t) ret;
1107
proc->buffer_length += (size_t) sret;
902
1108
}
903
1109
}
904
1110
}
905
906
1111
1112
907
1113
fallback:
908
1114
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1115
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1116
/* Fallback if all plugins failed, none are found or an error
1117
occured */
911
1118
bool bret;
912
1119
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
913
1120
char *passwordbuffer = getpass("Password: ");
914
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
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);
915
1128
if(not bret){
916
1129
perror("print_out_password");
917
1130
exitstatus = EXIT_FAILURE;
924
1137
perror("sigaction");
925
1138
exitstatus = EXIT_FAILURE;
926
1139
}
927
1140
928
1141
if(custom_argv != NULL){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1142
for(char **arg = custom_argv+1; *arg != NULL; arg++){
930
1143
free(*arg);
931
1144
}
932
1145
free(custom_argv);
933
1146
}
934
free_plugin_list(plugin_list);
935
1147
936
1148
if(dir != NULL){
937
1149
closedir(dir);
938
1150
}
939
1151
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");
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
}
948
1161
}
949
free(process_list->buffer);
950
free(process_list);
951
1162
}
952
1163
953
1164
/* Wait for any remaining child processes to terminate */
954
do{
1165
do {
955
1166
ret = wait(NULL);
956
1167
} while(ret >= 0);
957
1168
if(errno != ECHILD){
958
1169
perror("wait");
959
1170
}
960
1171
1172
free_plugin_list();
1173
1174
free(plugindir);
1175
free(argfile);
1176
961
1177
return exitstatus;
962
1178
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0