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- Committer: Björn Påhlsson
- Date: 2009-09-07 22:21:35 UTC
- mfrom: (358 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 415.
- Revision ID: belorn@braxen-20090907222135-pk7qmvsg3bmqqo5i
merge
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- plugins.d/password-request.c => plugins.d/mandos-client.c
- files modified:
- Makefile
added
removed
plugin-runner.c
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
21
22
* Contact the authors at <mandos@fukt.bsnet.se>.
22
23
*/
23
24
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
27
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
28
44
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir(), stat(),
30
struct stat, waitpid(),
31
WIFEXITED(), WEXITSTATUS(),
32
wait() */
33
#include <sys/wait.h> /* wait() */
34
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
35
readdir(), closedir() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
46
readdir(), closedir(), dirfd() */
37
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
38
fcntl() */
39
#include <fcntl.h> /* fcntl() */
40
#include <stddef.h> /* NULL */
41
#include <stdlib.h> /* EXIT_FAILURE */
42
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
43
FD_SET(), FD_ISSET() */
44
#include <string.h> /* strlen(), strcpy(), strcat() */
45
#include <stdbool.h> /* true */
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
47
WEXITSTATUS() */
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
53
close() */
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
48
58
#include <errno.h> /* errno */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
59
#include <argp.h> /* struct argp_option, struct
60
argp_state, struct argp,
61
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
64
#include <signal.h> /* struct sigaction, sigemptyset(),
65
sigaddset(), sigaction(),
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
52
71
53
72
#define BUFFER_SIZE 256
54
73
55
struct process;
56
57
typedef struct process{
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;
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
79
80
typedef struct plugin{
81
char *name; /* can be NULL or any plugin name */
82
char **argv;
83
int argc;
84
char **environ;
85
int envc;
86
bool disabled;
87
88
/* Variables used for running processes*/
58
89
pid_t pid;
59
90
int fd;
60
91
char *buffer;
61
92
size_t buffer_size;
62
93
size_t buffer_length;
63
94
bool eof;
64
bool completed;
95
volatile sig_atomic_t completed;
65
96
int status;
66
struct process *next;
67
} process;
68
69
typedef struct plugin{
70
char *name; /* can be NULL or any plugin name */
71
char **argv;
72
int argc;
73
bool disabled;
74
97
struct plugin *next;
75
98
} plugin;
76
99
77
static plugin *getplugin(char *name, plugin **plugin_list){
78
for (plugin *p = *plugin_list; p != NULL; p = p->next){
79
if ((p->name == name)
80
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))){
81
109
return p;
82
110
}
83
111
}
84
112
/* Create a new plugin */
85
113
plugin *new_plugin = malloc(sizeof(plugin));
86
if (new_plugin == NULL){
87
perror("malloc");
88
exit(EXIT_FAILURE);
89
}
90
new_plugin->name = name;
114
if(new_plugin == NULL){
115
return NULL;
116
}
117
char *copy_name = NULL;
118
if(name != NULL){
119
copy_name = strdup(name);
120
if(copy_name == NULL){
121
free(new_plugin);
122
return NULL;
123
}
124
}
125
126
*new_plugin = (plugin){ .name = copy_name,
127
.argc = 1,
128
.disabled = false,
129
.next = plugin_list };
130
91
131
new_plugin->argv = malloc(sizeof(char *) * 2);
92
if (new_plugin->argv == NULL){
93
perror("malloc");
94
exit(EXIT_FAILURE);
132
if(new_plugin->argv == NULL){
133
free(copy_name);
134
free(new_plugin);
135
return NULL;
95
136
}
96
new_plugin->argv[0] = name;
137
new_plugin->argv[0] = copy_name;
97
138
new_plugin->argv[1] = NULL;
98
new_plugin->argc = 1;
99
new_plugin->disabled = false;
100
new_plugin->next = *plugin_list;
139
140
new_plugin->environ = malloc(sizeof(char *));
141
if(new_plugin->environ == NULL){
142
free(copy_name);
143
free(new_plugin->argv);
144
free(new_plugin);
145
return NULL;
146
}
147
new_plugin->environ[0] = NULL;
148
101
149
/* Append the new plugin to the list */
102
*plugin_list = new_plugin;
150
plugin_list = new_plugin;
103
151
return new_plugin;
104
152
}
105
153
106
static void addargument(plugin *p, char *arg){
107
p->argv[p->argc] = arg;
108
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
109
if (p->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
112
}
113
p->argc++;
114
p->argv[p->argc] = NULL;
154
/* Helper function for add_argument and add_environment */
155
static bool add_to_char_array(const char *new, char ***array,
156
int *len){
157
/* Resize the pointed-to array to hold one more pointer */
158
*array = realloc(*array, sizeof(char *)
159
* (size_t) ((*len) + 2));
160
/* Malloc check */
161
if(*array == NULL){
162
return false;
163
}
164
/* Make a copy of the new string */
165
char *copy = strdup(new);
166
if(copy == NULL){
167
return false;
168
}
169
/* Insert the copy */
170
(*array)[*len] = copy;
171
(*len)++;
172
/* Add a new terminating NULL pointer to the last element */
173
(*array)[*len] = NULL;
174
return true;
175
}
176
177
/* Add to a plugin's argument vector */
178
static bool add_argument(plugin *p, const char *arg){
179
if(p == NULL){
180
return false;
181
}
182
return add_to_char_array(arg, &(p->argv), &(p->argc));
183
}
184
185
/* Add to a plugin's environment */
186
static bool add_environment(plugin *p, const char *def, bool replace){
187
if(p == NULL){
188
return false;
189
}
190
/* namelen = length of name of environment variable */
191
size_t namelen = (size_t)(strchrnul(def, '=') - def);
192
/* Search for this environment variable */
193
for(char **e = p->environ; *e != NULL; e++){
194
if(strncmp(*e, def, namelen + 1) == 0){
195
/* It already exists */
196
if(replace){
197
char *new = realloc(*e, strlen(def) + 1);
198
if(new == NULL){
199
return false;
200
}
201
*e = new;
202
strcpy(*e, def);
203
}
204
return true;
205
}
206
}
207
return add_to_char_array(def, &(p->environ), &(p->envc));
115
208
}
116
209
117
210
/*
119
212
* Descriptor Flags".
120
213
* *Note File Descriptor Flags:(libc)Descriptor Flags.
121
214
*/
122
static int set_cloexec_flag(int fd)
123
{
215
static int set_cloexec_flag(int fd){
124
216
int ret = fcntl(fd, F_GETFD, 0);
125
217
/* If reading the flags failed, return error indication now. */
126
218
if(ret < 0){
130
222
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
131
223
}
132
224
133
const char *argp_program_version = "plugbasedclient 0.9";
134
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
135
136
process *process_list = NULL;
137
138
/* Mark a process as completed when it exits, and save its exit
225
226
/* Mark processes as completed when they exit, and save their exit
139
227
status. */
140
void handle_sigchld(__attribute__((unused)) int sig){
141
process *proc = process_list;
142
int status;
143
pid_t pid = wait(&status);
144
while(proc != NULL and proc->pid != pid){
145
proc = proc->next;
146
}
147
if(proc == NULL){
148
/* Process not found in process list */
149
return;
150
}
151
proc->status = status;
152
proc->completed = true;
228
static void handle_sigchld(__attribute__((unused)) int sig){
229
int old_errno = errno;
230
while(true){
231
plugin *proc = plugin_list;
232
int status;
233
pid_t pid = waitpid(-1, &status, WNOHANG);
234
if(pid == 0){
235
/* Only still running child processes */
236
break;
237
}
238
if(pid == -1){
239
if(errno == ECHILD){
240
/* No child processes */
241
break;
242
}
243
perror("waitpid");
244
}
245
246
/* A child exited, find it in process_list */
247
while(proc != NULL and proc->pid != pid){
248
proc = proc->next;
249
}
250
if(proc == NULL){
251
/* Process not found in process list */
252
continue;
253
}
254
proc->status = status;
255
proc->completed = 1;
256
}
257
errno = old_errno;
258
}
259
260
/* Prints out a password to stdout */
261
static bool print_out_password(const char *buffer, size_t length){
262
ssize_t ret;
263
for(size_t written = 0; written < length; written += (size_t)ret){
264
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
265
length - written));
266
if(ret < 0){
267
return false;
268
}
269
}
270
return true;
271
}
272
273
/* Removes and free a plugin from the plugin list */
274
static void free_plugin(plugin *plugin_node){
275
276
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
277
free(*arg);
278
}
279
free(plugin_node->argv);
280
for(char **env = plugin_node->environ; *env != NULL; env++){
281
free(*env);
282
}
283
free(plugin_node->environ);
284
free(plugin_node->buffer);
285
286
/* Removes the plugin from the singly-linked list */
287
if(plugin_node == plugin_list){
288
/* First one - simple */
289
plugin_list = plugin_list->next;
290
} else {
291
/* Second one or later */
292
for(plugin *p = plugin_list; p != NULL; p = p->next){
293
if(p->next == plugin_node){
294
p->next = plugin_node->next;
295
break;
296
}
297
}
298
}
299
300
free(plugin_node);
301
}
302
303
static void free_plugin_list(void){
304
while(plugin_list != NULL){
305
free_plugin(plugin_list);
306
}
153
307
}
154
308
155
309
int main(int argc, char *argv[]){
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
310
char *plugindir = NULL;
311
char *argfile = NULL;
312
FILE *conffp;
157
313
size_t d_name_len;
158
314
DIR *dir = NULL;
159
315
struct dirent *dirst;
160
316
struct stat st;
161
317
fd_set rfds_all;
162
318
int ret, maxfd = 0;
319
ssize_t sret;
320
intmax_t tmpmax;
163
321
uid_t uid = 65534;
164
322
gid_t gid = 65534;
165
323
bool debug = false;
167
325
struct sigaction old_sigchld_action;
168
326
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
169
327
.sa_flags = SA_NOCLDSTOP };
170
char *plus_options = NULL;
171
char **plus_argv = NULL;
328
char **custom_argv = NULL;
329
int custom_argc = 0;
172
330
173
331
/* Establish a signal handler */
174
332
sigemptyset(&sigchld_action.sa_mask);
175
333
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
176
if(ret < 0){
334
if(ret == -1){
177
335
perror("sigaddset");
178
exit(EXIT_FAILURE);
336
exitstatus = EXIT_FAILURE;
337
goto fallback;
179
338
}
180
339
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
181
if(ret < 0){
340
if(ret == -1){
182
341
perror("sigaction");
183
exit(EXIT_FAILURE);
342
exitstatus = EXIT_FAILURE;
343
goto fallback;
184
344
}
185
345
186
346
/* The options we understand. */
188
348
{ .name = "global-options", .key = 'g',
189
349
.arg = "OPTION[,OPTION[,...]]",
190
350
.doc = "Options passed to all plugins" },
351
{ .name = "global-env", .key = 'G',
352
.arg = "VAR=value",
353
.doc = "Environment variable passed to all plugins" },
191
354
{ .name = "options-for", .key = 'o',
192
355
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
193
356
.doc = "Options passed only to specified plugin" },
357
{ .name = "env-for", .key = 'E',
358
.arg = "PLUGIN:ENV=value",
359
.doc = "Environment variable passed to specified plugin" },
194
360
{ .name = "disable", .key = 'd',
195
361
.arg = "PLUGIN",
196
362
.doc = "Disable a specific plugin", .group = 1 },
363
{ .name = "enable", .key = 'e',
364
.arg = "PLUGIN",
365
.doc = "Enable a specific plugin", .group = 1 },
197
366
{ .name = "plugin-dir", .key = 128,
198
367
.arg = "DIRECTORY",
199
368
.doc = "Specify a different plugin directory", .group = 2 },
200
{ .name = "userid", .key = 129,
201
.arg = "ID", .flags = 0,
202
.doc = "User ID the plugins will run as", .group = 2 },
203
{ .name = "groupid", .key = 130,
204
.arg = "ID", .flags = 0,
205
.doc = "Group ID the plugins will run as", .group = 2 },
206
{ .name = "debug", .key = 131,
207
.doc = "Debug mode", .group = 3 },
369
{ .name = "config-file", .key = 129,
370
.arg = "FILE",
371
.doc = "Specify a different configuration file", .group = 2 },
372
{ .name = "userid", .key = 130,
373
.arg = "ID", .flags = 0,
374
.doc = "User ID the plugins will run as", .group = 3 },
375
{ .name = "groupid", .key = 131,
376
.arg = "ID", .flags = 0,
377
.doc = "Group ID the plugins will run as", .group = 3 },
378
{ .name = "debug", .key = 132,
379
.doc = "Debug mode", .group = 4 },
208
380
{ .name = NULL }
209
381
};
210
382
211
error_t parse_opt (int key, char *arg, struct argp_state *state) {
212
/* Get the INPUT argument from `argp_parse', which we know is a
213
pointer to our plugin list pointer. */
214
plugin **plugins = state->input;
215
switch (key) {
216
case 'g':
217
if (arg != NULL){
218
char *p = strtok(arg, ",");
219
do{
220
addargument(getplugin(NULL, plugins), p);
221
p = strtok(NULL, ",");
222
} while (p != NULL);
223
}
224
break;
225
case 'o':
226
if (arg != NULL){
227
char *name = strtok(arg, ":");
228
char *p = strtok(NULL, ":");
229
if(p != NULL){
230
p = strtok(p, ",");
231
do{
232
addargument(getplugin(name, plugins), p);
233
p = strtok(NULL, ",");
234
} while (p != NULL);
235
}
236
}
237
break;
238
case 'd':
239
if (arg != NULL){
240
getplugin(arg, plugins)->disabled = true;
241
}
242
break;
243
case 128:
244
plugindir = arg;
245
break;
246
case 129:
247
uid = (uid_t)strtol(arg, NULL, 10);
248
break;
249
case 130:
250
gid = (gid_t)strtol(arg, NULL, 10);
251
break;
252
case 131:
383
error_t parse_opt(int key, char *arg, __attribute__((unused))
384
struct argp_state *state){
385
char *tmp;
386
switch(key){
387
case 'g': /* --global-options */
388
if(arg != NULL){
389
char *plugin_option;
390
while((plugin_option = strsep(&arg, ",")) != NULL){
391
if(plugin_option[0] == '\0'){
392
continue;
393
}
394
if(not add_argument(getplugin(NULL), plugin_option)){
395
perror("add_argument");
396
return ARGP_ERR_UNKNOWN;
397
}
398
}
399
}
400
break;
401
case 'G': /* --global-env */
402
if(arg == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), arg, true)){
406
perror("add_environment");
407
}
408
break;
409
case 'o': /* --options-for */
410
if(arg != NULL){
411
char *plugin_name = strsep(&arg, ":");
412
if(plugin_name[0] == '\0'){
413
break;
414
}
415
char *plugin_option;
416
while((plugin_option = strsep(&arg, ",")) != NULL){
417
if(not add_argument(getplugin(plugin_name), plugin_option)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
420
}
421
}
422
}
423
break;
424
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
428
{
429
char *envdef = strchr(arg, ':');
430
if(envdef == NULL){
431
break;
432
}
433
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
436
}
437
}
438
break;
439
case 'd': /* --disable */
440
if(arg != NULL){
441
plugin *p = getplugin(arg);
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
444
}
445
p->disabled = true;
446
}
447
break;
448
case 'e': /* --enable */
449
if(arg != NULL){
450
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
453
}
454
p->disabled = false;
455
}
456
break;
457
case 128: /* --plugin-dir */
458
free(plugindir);
459
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
463
break;
464
case 129: /* --config-file */
465
/* This is already done by parse_opt_config_file() */
466
break;
467
case 130: /* --userid */
468
errno = 0;
469
tmpmax = strtoimax(arg, &tmp, 10);
470
if(errno != 0 or tmp == arg or *tmp != '\0'
471
or tmpmax != (uid_t)tmpmax){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
476
}
477
break;
478
case 131: /* --groupid */
479
errno = 0;
480
tmpmax = strtoimax(arg, &tmp, 10);
481
if(errno != 0 or tmp == arg or *tmp != '\0'
482
or tmpmax != (gid_t)tmpmax){
483
fprintf(stderr, "Bad group ID number: \"%s\", using %"
484
PRIdMAX "\n", arg, (intmax_t)gid);
485
} else {
486
gid = (gid_t)tmpmax;
487
}
488
break;
489
case 132: /* --debug */
253
490
debug = true;
254
491
break;
255
case ARGP_KEY_ARG:
256
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
257
argp_usage (state);
258
}
259
plus_options = arg;
260
break;
261
case ARGP_KEY_END:
262
break;
263
default:
264
return ARGP_ERR_UNKNOWN;
265
}
266
return 0;
267
}
268
269
plugin *plugin_list = NULL;
270
271
struct argp argp = { .options = options, .parser = parse_opt,
272
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
492
/*
493
* When adding more options before this line, remember to also add a
494
* "case" to the "parse_opt_config_file" function below.
495
*/
496
case ARGP_KEY_ARG:
497
/* Cryptsetup always passes an argument, which is an empty
498
string if "none" was specified in /etc/crypttab. So if
499
argument was empty, we ignore it silently. */
500
if(arg[0] != '\0'){
501
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
502
}
503
break;
504
case ARGP_KEY_END:
505
break;
506
default:
507
return ARGP_ERR_UNKNOWN;
508
}
509
return 0;
510
}
511
512
/* This option parser is the same as parse_opt() above, except it
513
ignores everything but the --config-file option. */
514
error_t parse_opt_config_file(int key, char *arg,
515
__attribute__((unused))
516
struct argp_state *state){
517
switch(key){
518
case 'g': /* --global-options */
519
case 'G': /* --global-env */
520
case 'o': /* --options-for */
521
case 'E': /* --env-for */
522
case 'd': /* --disable */
523
case 'e': /* --enable */
524
case 128: /* --plugin-dir */
525
break;
526
case 129: /* --config-file */
527
free(argfile);
528
argfile = strdup(arg);
529
if(argfile == NULL){
530
perror("strdup");
531
}
532
break;
533
case 130: /* --userid */
534
case 131: /* --groupid */
535
case 132: /* --debug */
536
case ARGP_KEY_ARG:
537
case ARGP_KEY_END:
538
break;
539
default:
540
return ARGP_ERR_UNKNOWN;
541
}
542
return 0;
543
}
544
545
struct argp argp = { .options = options,
546
.parser = parse_opt_config_file,
547
.args_doc = "",
273
548
.doc = "Mandos plugin runner -- Run plugins" };
274
549
275
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
276
277
if(plus_options){
278
/* This is a mangled argument in the form of
279
"+--option+--other-option=parameter+--yet-another-option", etc */
280
/* Make new argc and argv vars, and call argp_parse() again. */
281
plus_options++; /* skip the first '+' character */
282
const char delims[] = "+";
283
char *arg;
284
int new_argc = 1;
285
plus_argv = malloc(sizeof(char*) * 2);
286
if(plus_argv == NULL){
550
/* Parse using parse_opt_config_file() in order to get the custom
551
config file location, if any. */
552
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
553
if(ret == ARGP_ERR_UNKNOWN){
554
fprintf(stderr, "Unknown error while parsing arguments\n");
555
exitstatus = EXIT_FAILURE;
556
goto fallback;
557
}
558
559
/* Reset to the normal argument parser */
560
argp.parser = parse_opt;
561
562
/* Open the configfile if available */
563
if(argfile == NULL){
564
conffp = fopen(AFILE, "r");
565
} else {
566
conffp = fopen(argfile, "r");
567
}
568
if(conffp != NULL){
569
char *org_line = NULL;
570
char *p, *arg, *new_arg, *line;
571
size_t size = 0;
572
const char whitespace_delims[] = " \r\t\f\v\n";
573
const char comment_delim[] = "#";
574
575
custom_argc = 1;
576
custom_argv = malloc(sizeof(char*) * 2);
577
if(custom_argv == NULL){
287
578
perror("malloc");
288
579
exitstatus = EXIT_FAILURE;
289
goto end;
290
}
291
plus_argv[0] = argv[0];
292
plus_argv[1] = NULL;
293
arg = strtok(plus_options, delims); /* Get first argument */
294
while(arg != NULL){
295
new_argc++;
296
plus_argv = realloc(plus_argv, sizeof(char *)
297
* ((unsigned int) new_argc + 1));
298
if(plus_argv == NULL){
299
perror("malloc");
300
exitstatus = EXIT_FAILURE;
301
goto end;
302
}
303
plus_argv[new_argc-1] = arg;
304
plus_argv[new_argc] = NULL;
305
arg = strtok(NULL, delims); /* Get next argument */
306
}
307
argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
580
goto fallback;
581
}
582
custom_argv[0] = argv[0];
583
custom_argv[1] = NULL;
584
585
/* for each line in the config file, strip whitespace and ignore
586
commented text */
587
while(true){
588
sret = getline(&org_line, &size, conffp);
589
if(sret == -1){
590
break;
591
}
592
593
line = org_line;
594
arg = strsep(&line, comment_delim);
595
while((p = strsep(&arg, whitespace_delims)) != NULL){
596
if(p[0] == '\0'){
597
continue;
598
}
599
new_arg = strdup(p);
600
if(new_arg == NULL){
601
perror("strdup");
602
exitstatus = EXIT_FAILURE;
603
free(org_line);
604
goto fallback;
605
}
606
607
custom_argc += 1;
608
custom_argv = realloc(custom_argv, sizeof(char *)
609
* ((unsigned int) custom_argc + 1));
610
if(custom_argv == NULL){
611
perror("realloc");
612
exitstatus = EXIT_FAILURE;
613
free(org_line);
614
goto fallback;
615
}
616
custom_argv[custom_argc-1] = new_arg;
617
custom_argv[custom_argc] = NULL;
618
}
619
}
620
free(org_line);
621
} else {
622
/* Check for harmful errors and go to fallback. Other errors might
623
not affect opening plugins */
624
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
625
perror("fopen");
626
exitstatus = EXIT_FAILURE;
627
goto fallback;
628
}
629
}
630
/* If there was any arguments from configuration file,
631
pass them to parser as command arguments */
632
if(custom_argv != NULL){
633
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
634
0, NULL);
635
if(ret == ARGP_ERR_UNKNOWN){
636
fprintf(stderr, "Unknown error while parsing arguments\n");
637
exitstatus = EXIT_FAILURE;
638
goto fallback;
639
}
640
}
641
642
/* Parse actual command line arguments, to let them override the
643
config file */
644
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
645
if(ret == ARGP_ERR_UNKNOWN){
646
fprintf(stderr, "Unknown error while parsing arguments\n");
647
exitstatus = EXIT_FAILURE;
648
goto fallback;
308
649
}
309
650
310
651
if(debug){
314
655
for(char **a = p->argv; *a != NULL; a++){
315
656
fprintf(stderr, "\tArg: %s\n", *a);
316
657
}
658
fprintf(stderr, "...and %d environment variables\n", p->envc);
659
for(char **a = p->environ; *a != NULL; a++){
660
fprintf(stderr, "\t%s\n", *a);
661
}
317
662
}
318
663
}
319
664
665
/* Strip permissions down to nobody */
666
setgid(gid);
667
if(ret == -1){
668
perror("setgid");
669
}
320
670
ret = setuid(uid);
321
if (ret == -1){
671
if(ret == -1){
322
672
perror("setuid");
323
673
}
324
674
325
setgid(gid);
326
if (ret == -1){
327
perror("setgid");
675
if(plugindir == NULL){
676
dir = opendir(PDIR);
677
} else {
678
dir = opendir(plugindir);
328
679
}
329
680
330
dir = opendir(plugindir);
331
681
if(dir == NULL){
332
682
perror("Could not open plugin dir");
333
683
exitstatus = EXIT_FAILURE;
334
goto end;
684
goto fallback;
335
685
}
336
686
337
687
/* Set the FD_CLOEXEC flag on the directory, if possible */
342
692
if(ret < 0){
343
693
perror("set_cloexec_flag");
344
694
exitstatus = EXIT_FAILURE;
345
goto end;
695
goto fallback;
346
696
}
347
697
}
348
698
}
349
699
350
700
FD_ZERO(&rfds_all);
351
701
702
/* Read and execute any executable in the plugin directory*/
352
703
while(true){
353
704
dirst = readdir(dir);
354
705
355
// All directory entries have been processed
706
/* All directory entries have been processed */
356
707
if(dirst == NULL){
708
if(errno == EBADF){
709
perror("readdir");
710
exitstatus = EXIT_FAILURE;
711
goto fallback;
712
}
357
713
break;
358
714
}
359
715
360
716
d_name_len = strlen(dirst->d_name);
361
717
362
// Ignore dotfiles, backup files and other junk
718
/* Ignore dotfiles, backup files and other junk */
363
719
{
364
720
bool bad_name = false;
365
721
367
723
368
724
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
369
725
".dpkg-old",
726
".dpkg-bak",
370
727
".dpkg-divert", NULL };
371
728
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
372
729
size_t pre_len = strlen(*pre);
380
737
break;
381
738
}
382
739
}
383
384
740
if(bad_name){
385
741
continue;
386
742
}
387
388
743
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
389
744
size_t suf_len = strlen(*suf);
390
745
if((d_name_len >= suf_len)
404
759
}
405
760
}
406
761
407
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
408
if (filename == NULL){
409
perror("malloc");
410
exitstatus = EXIT_FAILURE;
411
goto end;
412
}
413
strcpy(filename, plugindir); /* Spurious warning */
414
strcat(filename, "/"); /* Spurious warning */
415
strcat(filename, dirst->d_name); /* Spurious warning */
416
417
stat(filename, &st);
418
419
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
762
char *filename;
763
if(plugindir == NULL){
764
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
765
} else {
766
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
767
}
768
if(ret < 0){
769
perror("asprintf");
770
continue;
771
}
772
773
ret = stat(filename, &st);
774
if(ret == -1){
775
perror("stat");
776
free(filename);
777
continue;
778
}
779
780
/* Ignore non-executable files */
781
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
420
782
if(debug){
421
783
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
422
784
" with bad type or mode\n", filename);
424
786
free(filename);
425
787
continue;
426
788
}
427
if(getplugin(dirst->d_name, &plugin_list)->disabled){
789
790
plugin *p = getplugin(dirst->d_name);
791
if(p == NULL){
792
perror("getplugin");
793
free(filename);
794
continue;
795
}
796
if(p->disabled){
428
797
if(debug){
429
798
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
430
799
dirst->d_name);
432
801
free(filename);
433
802
continue;
434
803
}
435
plugin *p = getplugin(dirst->d_name, &plugin_list);
436
804
{
437
805
/* Add global arguments to argument list for this plugin */
438
plugin *g = getplugin(NULL, &plugin_list);
439
for(char **a = g->argv + 1; *a != NULL; a++){
440
addargument(p, *a);
441
}
442
}
443
int pipefd[2];
806
plugin *g = getplugin(NULL);
807
if(g != NULL){
808
for(char **a = g->argv + 1; *a != NULL; a++){
809
if(not add_argument(p, *a)){
810
perror("add_argument");
811
}
812
}
813
/* Add global environment variables */
814
for(char **e = g->environ; *e != NULL; e++){
815
if(not add_environment(p, *e, false)){
816
perror("add_environment");
817
}
818
}
819
}
820
}
821
/* If this plugin has any environment variables, we will call
822
using execve and need to duplicate the environment from this
823
process, too. */
824
if(p->environ[0] != NULL){
825
for(char **e = environ; *e != NULL; e++){
826
if(not add_environment(p, *e, false)){
827
perror("add_environment");
828
}
829
}
830
}
831
832
int pipefd[2];
444
833
ret = pipe(pipefd);
445
if (ret == -1){
834
if(ret == -1){
446
835
perror("pipe");
447
836
exitstatus = EXIT_FAILURE;
448
goto end;
837
goto fallback;
449
838
}
839
/* Ask OS to automatic close the pipe on exec */
450
840
ret = set_cloexec_flag(pipefd[0]);
451
841
if(ret < 0){
452
842
perror("set_cloexec_flag");
453
843
exitstatus = EXIT_FAILURE;
454
goto end;
844
goto fallback;
455
845
}
456
846
ret = set_cloexec_flag(pipefd[1]);
457
847
if(ret < 0){
458
848
perror("set_cloexec_flag");
459
849
exitstatus = EXIT_FAILURE;
460
goto end;
850
goto fallback;
461
851
}
462
852
/* Block SIGCHLD until process is safely in process list */
463
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
464
854
if(ret < 0){
465
855
perror("sigprocmask");
466
856
exitstatus = EXIT_FAILURE;
467
goto end;
857
goto fallback;
468
858
}
469
// Starting a new process to be watched
859
/* Starting a new process to be watched */
470
860
pid_t pid = fork();
861
if(pid == -1){
862
perror("fork");
863
exitstatus = EXIT_FAILURE;
864
goto fallback;
865
}
471
866
if(pid == 0){
472
867
/* this is the child process */
473
868
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
475
870
perror("sigaction");
476
871
_exit(EXIT_FAILURE);
477
872
}
478
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
873
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
479
874
if(ret < 0){
480
875
perror("sigprocmask");
481
876
_exit(EXIT_FAILURE);
482
877
}
483
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
878
879
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
880
if(ret == -1){
881
perror("dup2");
882
_exit(EXIT_FAILURE);
883
}
484
884
485
885
if(dirfd(dir) < 0){
486
886
/* If dir has no file descriptor, we could not set FD_CLOEXEC
487
887
above and must now close it manually here. */
488
888
closedir(dir);
489
889
}
490
if(execv(filename, p->argv) < 0){
491
perror("execv");
492
_exit(EXIT_FAILURE);
890
if(p->environ[0] == NULL){
891
if(execv(filename, p->argv) < 0){
892
perror("execv");
893
_exit(EXIT_FAILURE);
894
}
895
} else {
896
if(execve(filename, p->argv, p->environ) < 0){
897
perror("execve");
898
_exit(EXIT_FAILURE);
899
}
493
900
}
494
901
/* no return */
495
902
}
496
/* parent process */
903
/* Parent process */
904
close(pipefd[1]); /* Close unused write end of pipe */
497
905
free(filename);
498
close(pipefd[1]); /* close unused write end of pipe */
499
process *new_process = malloc(sizeof(process));
500
if (new_process == NULL){
501
perror("malloc");
502
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
906
plugin *new_plugin = getplugin(dirst->d_name);
907
if(new_plugin == NULL){
908
perror("getplugin");
909
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
503
910
if(ret < 0){
504
perror("sigprocmask");
911
perror("sigprocmask");
505
912
}
506
913
exitstatus = EXIT_FAILURE;
507
goto end;
914
goto fallback;
508
915
}
509
916
510
*new_process = (struct process){ .pid = pid,
511
.fd = pipefd[0],
512
.next = process_list };
513
// List handling
514
process_list = new_process;
917
new_plugin->pid = pid;
918
new_plugin->fd = pipefd[0];
919
515
920
/* Unblock SIGCHLD so signal handler can be run if this process
516
921
has already completed */
517
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
922
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
518
923
if(ret < 0){
519
924
perror("sigprocmask");
520
925
exitstatus = EXIT_FAILURE;
521
goto end;
522
}
523
524
FD_SET(new_process->fd, &rfds_all);
525
526
if (maxfd < new_process->fd){
527
maxfd = new_process->fd;
528
}
529
530
}
531
532
/* Free the plugin list */
533
for(plugin *next; plugin_list != NULL; plugin_list = next){
534
next = plugin_list->next;
535
free(plugin_list->argv);
536
free(plugin_list);
926
goto fallback;
927
}
928
929
FD_SET(new_plugin->fd, &rfds_all);
930
931
if(maxfd < new_plugin->fd){
932
maxfd = new_plugin->fd;
933
}
537
934
}
538
935
539
936
closedir(dir);
540
937
dir = NULL;
938
free_plugin(getplugin(NULL));
541
939
542
if (process_list == NULL){
543
fprintf(stderr, "No plugin processes started, exiting\n");
544
exitstatus = EXIT_FAILURE;
545
goto end;
940
for(plugin *p = plugin_list; p != NULL; p = p->next){
941
if(p->pid != 0){
942
break;
943
}
944
if(p->next == NULL){
945
fprintf(stderr, "No plugin processes started. Incorrect plugin"
946
" directory?\n");
947
free_plugin_list();
948
}
546
949
}
547
while(process_list){
950
951
/* Main loop while running plugins exist */
952
while(plugin_list){
548
953
fd_set rfds = rfds_all;
549
954
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
550
if (select_ret == -1){
955
if(select_ret == -1){
551
956
perror("select");
552
957
exitstatus = EXIT_FAILURE;
553
goto end;
958
goto fallback;
554
959
}
555
960
/* OK, now either a process completed, or something can be read
556
961
from one of them */
557
for(process *proc = process_list; proc ; proc = proc->next){
962
for(plugin *proc = plugin_list; proc != NULL;){
558
963
/* Is this process completely done? */
559
if(proc->eof and proc->completed){
964
if(proc->completed and proc->eof){
560
965
/* Only accept the plugin output if it exited cleanly */
561
966
if(not WIFEXITED(proc->status)
562
967
or WEXITSTATUS(proc->status) != 0){
563
968
/* Bad exit by plugin */
969
564
970
if(debug){
565
971
if(WIFEXITED(proc->status)){
566
fprintf(stderr, "Plugin %d exited with status %d\n",
567
proc->pid, WEXITSTATUS(proc->status));
568
} else if(WIFSIGNALED(proc->status)) {
569
fprintf(stderr, "Plugin %d killed by signal %d\n",
570
proc->pid, WTERMSIG(proc->status));
972
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
973
" status %d\n", proc->name,
974
(intmax_t) (proc->pid),
975
WEXITSTATUS(proc->status));
976
} else if(WIFSIGNALED(proc->status)){
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
978
" signal %d: %s\n", proc->name,
979
(intmax_t) (proc->pid),
980
WTERMSIG(proc->status),
981
strsignal(WTERMSIG(proc->status)));
571
982
} else if(WCOREDUMP(proc->status)){
572
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
983
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
984
" core\n", proc->name, (intmax_t) (proc->pid));
573
985
}
574
986
}
987
575
988
/* Remove the plugin */
576
989
FD_CLR(proc->fd, &rfds_all);
990
577
991
/* Block signal while modifying process_list */
578
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
992
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
579
993
if(ret < 0){
580
994
perror("sigprocmask");
581
995
exitstatus = EXIT_FAILURE;
582
goto end;
583
}
584
/* Delete this process entry from the list */
585
if(process_list == proc){
586
/* First one - simple */
587
process_list = proc->next;
588
} else {
589
/* Second one or later */
590
for(process *p = process_list; p != NULL; p = p->next){
591
if(p->next == proc){
592
p->next = proc->next;
593
break;
594
}
595
}
596
}
996
goto fallback;
997
}
998
999
plugin *next_plugin = proc->next;
1000
free_plugin(proc);
1001
proc = next_plugin;
1002
597
1003
/* We are done modifying process list, so unblock signal */
598
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
599
NULL);
1004
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1005
NULL);
600
1006
if(ret < 0){
601
1007
perror("sigprocmask");
602
}
603
free(proc->buffer);
604
free(proc);
605
/* We deleted this process from the list, so we can't go
606
proc->next. Therefore, start over from the beginning of
607
the process list */
608
break;
1008
exitstatus = EXIT_FAILURE;
1009
goto fallback;
1010
}
1011
1012
if(plugin_list == NULL){
1013
break;
1014
}
1015
1016
continue;
609
1017
}
1018
610
1019
/* This process exited nicely, so print its buffer */
611
for(size_t written = 0; written < proc->buffer_length;
612
written += (size_t)ret){
613
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
614
proc->buffer + written,
615
proc->buffer_length
616
- written));
617
if(ret < 0){
618
perror("write");
619
exitstatus = EXIT_FAILURE;
620
goto end;
621
}
1020
1021
bool bret = print_out_password(proc->buffer,
1022
proc->buffer_length);
1023
if(not bret){
1024
perror("print_out_password");
1025
exitstatus = EXIT_FAILURE;
622
1026
}
623
goto end;
1027
goto fallback;
624
1028
}
1029
625
1030
/* This process has not completed. Does it have any output? */
626
1031
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
627
1032
/* This process had nothing to say at this time */
1033
proc = proc->next;
628
1034
continue;
629
1035
}
630
1036
/* Before reading, make the process' data buffer large enough */
631
1037
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
632
1038
proc->buffer = realloc(proc->buffer, proc->buffer_size
633
1039
+ (size_t) BUFFER_SIZE);
634
if (proc->buffer == NULL){
1040
if(proc->buffer == NULL){
635
1041
perror("malloc");
636
1042
exitstatus = EXIT_FAILURE;
637
goto end;
1043
goto fallback;
638
1044
}
639
1045
proc->buffer_size += BUFFER_SIZE;
640
1046
}
641
1047
/* Read from the process */
642
ret = read(proc->fd, proc->buffer + proc->buffer_length,
643
BUFFER_SIZE);
644
if(ret < 0){
1048
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1049
BUFFER_SIZE);
1050
if(sret < 0){
645
1051
/* Read error from this process; ignore the error */
1052
proc = proc->next;
646
1053
continue;
647
1054
}
648
if(ret == 0){
1055
if(sret == 0){
649
1056
/* got EOF */
650
1057
proc->eof = true;
651
1058
} else {
652
proc->buffer_length += (size_t) ret;
1059
proc->buffer_length += (size_t) sret;
653
1060
}
654
1061
}
655
1062
}
656
if(process_list == NULL){
657
fprintf(stderr, "All plugin processes failed, exiting\n");
658
exitstatus = EXIT_FAILURE;
1063
1064
1065
fallback:
1066
1067
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1068
/* Fallback if all plugins failed, none are found or an error
1069
occured */
1070
bool bret;
1071
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1072
char *passwordbuffer = getpass("Password: ");
1073
size_t len = strlen(passwordbuffer);
1074
/* Strip trailing newline */
1075
if(len > 0 and passwordbuffer[len-1] == '\n'){
1076
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1077
len--;
1078
}
1079
bret = print_out_password(passwordbuffer, len);
1080
if(not bret){
1081
perror("print_out_password");
1082
exitstatus = EXIT_FAILURE;
1083
}
659
1084
}
660
1085
661
end:
662
1086
/* Restore old signal handler */
663
sigaction(SIGCHLD, &old_sigchld_action, NULL);
664
665
free(plus_argv);
666
667
/* Free the plugin list */
668
for(plugin *next; plugin_list != NULL; plugin_list = next){
669
next = plugin_list->next;
670
free(plugin_list->argv);
671
free(plugin_list);
1087
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1088
if(ret == -1){
1089
perror("sigaction");
1090
exitstatus = EXIT_FAILURE;
1091
}
1092
1093
if(custom_argv != NULL){
1094
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1095
free(*arg);
1096
}
1097
free(custom_argv);
672
1098
}
673
1099
674
1100
if(dir != NULL){
675
1101
closedir(dir);
676
1102
}
677
1103
678
/* Free the process list and kill the processes */
679
for(process *next; process_list != NULL; process_list = next){
680
next = process_list->next;
681
close(process_list->fd);
682
kill(process_list->pid, SIGTERM);
683
free(process_list->buffer);
684
free(process_list);
1104
/* Kill the processes */
1105
for(plugin *p = plugin_list; p != NULL; p = p->next){
1106
if(p->pid != 0){
1107
close(p->fd);
1108
ret = kill(p->pid, SIGTERM);
1109
if(ret == -1 and errno != ESRCH){
1110
/* Set-uid proccesses might not get closed */
1111
perror("kill");
1112
}
1113
}
685
1114
}
686
1115
687
1116
/* Wait for any remaining child processes to terminate */
692
1121
perror("wait");
693
1122
}
694
1123
1124
free_plugin_list();
1125
1126
free(plugindir);
1127
free(argfile);
1128
695
1129
return exitstatus;
696
1130
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0