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- Committer: Teddy Hogeborn
- Date: 2008-08-16 03:29:08 UTC
- Revision ID: teddy@fukt.bsnet.se-20080816032908-ihw7c05r2mnyk389
Add feature to specify custom environment variables for plugins.
* plugin-runner.c (plugin): New members "environ" and "envc" to
contain possible custom environment.
(getplugin): Return NULL on failure instead of doing exit(); all
callers changed.
(add_to_char_array): New helper function for "add_argument" and
"add_environment".
(addargument): Renamed to "add_argument". Return bool. Call
"add_to_char_array" to actually do things.
(add_environment): New; analogous to "add_argument".
(addcustomargument): Renamed to "add_to_argv" to avoid confusion
with "add_argument".
(main): New options "--global-envs" and "--envs-for" to specify
custom environment for plugins. Print environment for
plugins in debug mode. Use asprintf instead of strcpy and
strcat. Use execve() for plugins with custom environments.
Free environment for plugin when freeing plugin list.
* plugin-runner.c (plugin): New members "environ" and "envc" to
contain possible custom environment.
(getplugin): Return NULL on failure instead of doing exit(); all
callers changed.
(add_to_char_array): New helper function for "add_argument" and
"add_environment".
(addargument): Renamed to "add_argument". Return bool. Call
"add_to_char_array" to actually do things.
(add_environment): New; analogous to "add_argument".
(addcustomargument): Renamed to "add_to_argv" to avoid confusion
with "add_argument".
(main): New options "--global-envs" and "--envs-for" to specify
custom environment for plugins. Print environment for
plugins in debug mode. Use asprintf instead of strcpy and
strcat. Use execve() for plugins with custom environments.
Free environment for plugin when freeing plugin list.
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
28
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
33
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
47
46
fcntl(), setuid(), setgid(),
48
47
F_GETFD, F_SETFD, FD_CLOEXEC,
49
48
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
51
50
execv(), write(), read(),
52
51
close() */
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
57
56
#include <argp.h> /* struct argp_option, struct
58
57
argp_state, struct argp,
59
58
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
60
#include <signal.h> /* struct sigaction, sigemptyset(),
63
61
sigaddset(), sigaction(),
64
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
63
SIG_UNBLOCK, kill() */
66
64
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
68
65
69
66
#define BUFFER_SIZE 256
70
71
#define PDIR "/lib/mandos/plugins.d"
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
74
const char *argp_program_version = "plugin-runner " VERSION;
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
75
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
76
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
77
86
typedef struct plugin{
78
87
char *name; /* can be NULL or any plugin name */
79
88
char **argv;
81
90
char **environ;
82
91
int envc;
83
92
bool disabled;
84
85
/* Variables used for running processes*/
86
pid_t pid;
87
int fd;
88
char *buffer;
89
size_t buffer_size;
90
size_t buffer_length;
91
bool eof;
92
volatile bool completed;
93
volatile int status;
94
93
struct plugin *next;
95
94
} plugin;
96
95
97
static plugin *plugin_list = NULL;
98
99
/* Gets an existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
if((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
if ((p->name == name)
99
or (p->name and name and (strcmp(p->name, name) == 0))){
106
100
return p;
107
101
}
108
102
}
109
103
/* Create a new plugin */
110
104
plugin *new_plugin = malloc(sizeof(plugin));
111
if(new_plugin == NULL){
105
if (new_plugin == NULL){
112
106
return NULL;
113
107
}
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
return NULL;
119
}
120
}
121
122
*new_plugin = (plugin) { .name = copy_name,
108
*new_plugin = (plugin) { .name = name,
123
109
.argc = 1,
110
.envc = 0,
124
111
.disabled = false,
125
.next = plugin_list };
112
.next = *plugin_list };
126
113
127
114
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if(new_plugin->argv == NULL){
129
free(copy_name);
115
if (new_plugin->argv == NULL){
130
116
free(new_plugin);
131
117
return NULL;
132
118
}
133
new_plugin->argv[0] = copy_name;
119
new_plugin->argv[0] = name;
134
120
new_plugin->argv[1] = NULL;
135
121
136
122
new_plugin->environ = malloc(sizeof(char *));
137
123
if(new_plugin->environ == NULL){
138
free(copy_name);
139
124
free(new_plugin->argv);
140
125
free(new_plugin);
141
126
return NULL;
142
127
}
143
128
new_plugin->environ[0] = NULL;
144
145
129
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
130
*plugin_list = new_plugin;
147
131
return new_plugin;
148
132
}
149
133
179
163
}
180
164
181
165
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
166
static bool add_environment(plugin *p, const char *def){
183
167
if(p == NULL){
184
168
return false;
185
169
}
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
191
/* It already exists */
192
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
195
return false;
196
}
197
*e = new;
198
strcpy(*e, def);
199
}
200
return true;
201
}
202
}
203
170
return add_to_char_array(def, &(p->environ), &(p->envc));
204
171
}
205
172
173
206
174
/*
207
175
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
176
* Descriptor Flags".
209
177
* *Note File Descriptor Flags:(libc)Descriptor Flags.
210
178
*/
211
static int set_cloexec_flag(int fd){
179
static int set_cloexec_flag(int fd)
180
{
212
181
int ret = fcntl(fd, F_GETFD, 0);
213
182
/* If reading the flags failed, return error indication now. */
214
183
if(ret < 0){
218
187
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
219
188
}
220
189
190
process *process_list = NULL;
221
191
222
/* Mark processes as completed when they exit, and save their exit
192
/* Mark a process as completed when it exits, and save its exit
223
193
status. */
224
static void handle_sigchld(__attribute__((unused)) int sig){
225
while(true){
226
plugin *proc = plugin_list;
227
int status;
228
pid_t pid = waitpid(-1, &status, WNOHANG);
229
if(pid == 0){
230
/* Only still running child processes */
231
break;
232
}
233
if(pid == -1){
234
if(errno != ECHILD){
235
perror("waitpid");
236
}
237
/* No child processes */
238
break;
239
}
240
241
/* A child exited, find it in process_list */
242
while(proc != NULL and proc->pid != pid){
243
proc = proc->next;
244
}
245
if(proc == NULL){
246
/* Process not found in process list */
247
continue;
248
}
249
proc->status = status;
250
proc->completed = true;
251
}
194
void handle_sigchld(__attribute__((unused)) int sig){
195
process *proc = process_list;
196
int status;
197
pid_t pid = wait(&status);
198
if(pid == -1){
199
perror("wait");
200
return;
201
}
202
while(proc != NULL and proc->pid != pid){
203
proc = proc->next;
204
}
205
if(proc == NULL){
206
/* Process not found in process list */
207
return;
208
}
209
proc->status = status;
210
proc->completed = true;
252
211
}
253
212
254
/* Prints out a password to stdout */
255
static bool print_out_password(const char *buffer, size_t length){
213
bool print_out_password(const char *buffer, size_t length){
256
214
ssize_t ret;
215
if(length>0 and buffer[length-1] == '\n'){
216
length--;
217
}
257
218
for(size_t written = 0; written < length; written += (size_t)ret){
258
219
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
259
220
length - written));
264
225
return true;
265
226
}
266
227
267
/* Removes and free a plugin from the plugin list */
268
static void free_plugin(plugin *plugin_node){
269
270
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
271
free(*arg);
272
}
273
free(plugin_node->argv);
274
for(char **env = plugin_node->environ; *env != NULL; env++){
275
free(*env);
276
}
277
free(plugin_node->environ);
278
free(plugin_node->buffer);
279
280
/* Removes the plugin from the singly-linked list */
281
if(plugin_node == plugin_list){
282
/* First one - simple */
283
plugin_list = plugin_list->next;
284
} else {
285
/* Second one or later */
286
for(plugin *p = plugin_list; p != NULL; p = p->next){
287
if(p->next == plugin_node){
288
p->next = plugin_node->next;
289
break;
290
}
228
char **add_to_argv(char **argv, int *argc, char *arg){
229
if (argv == NULL){
230
*argc = 1;
231
argv = malloc(sizeof(char*) * 2);
232
if(argv == NULL){
233
return NULL;
291
234
}
292
}
293
294
free(plugin_node);
295
}
296
297
static void free_plugin_list(void){
298
while(plugin_list != NULL){
299
free_plugin(plugin_list);
300
}
235
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
236
argv[1] = NULL;
237
}
238
*argc += 1;
239
argv = realloc(argv, sizeof(char *)
240
* ((unsigned int) *argc + 1));
241
if(argv == NULL){
242
return NULL;
243
}
244
argv[*argc-1] = arg;
245
argv[*argc] = NULL;
246
return argv;
301
247
}
302
248
303
249
int main(int argc, char *argv[]){
304
char *plugindir = NULL;
305
char *argfile = NULL;
250
const char *plugindir = "/lib/mandos/plugins.d";
251
const char *argfile = ARGFILE;
306
252
FILE *conffp;
307
253
size_t d_name_len;
308
254
DIR *dir = NULL;
309
255
struct dirent *dirst;
310
256
struct stat st;
311
257
fd_set rfds_all;
312
int ret, numchars, maxfd = 0;
313
ssize_t sret;
314
intmax_t tmpmax;
258
int ret, maxfd = 0;
315
259
uid_t uid = 65534;
316
260
gid_t gid = 65534;
317
261
bool debug = false;
325
269
/* Establish a signal handler */
326
270
sigemptyset(&sigchld_action.sa_mask);
327
271
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
328
if(ret == -1){
272
if(ret < 0){
329
273
perror("sigaddset");
330
exitstatus = EXIT_FAILURE;
331
goto fallback;
274
exit(EXIT_FAILURE);
332
275
}
333
276
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
334
if(ret == -1){
277
if(ret < 0){
335
278
perror("sigaction");
336
exitstatus = EXIT_FAILURE;
337
goto fallback;
279
exit(EXIT_FAILURE);
338
280
}
339
281
340
282
/* The options we understand. */
342
284
{ .name = "global-options", .key = 'g',
343
285
.arg = "OPTION[,OPTION[,...]]",
344
286
.doc = "Options passed to all plugins" },
345
{ .name = "global-env", .key = 'G',
287
{ .name = "global-envs", .key = 'e',
346
288
.arg = "VAR=value",
347
289
.doc = "Environment variable passed to all plugins" },
348
290
{ .name = "options-for", .key = 'o',
349
291
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
350
292
.doc = "Options passed only to specified plugin" },
351
{ .name = "env-for", .key = 'E',
293
{ .name = "envs-for", .key = 'f',
352
294
.arg = "PLUGIN:ENV=value",
353
295
.doc = "Environment variable passed to specified plugin" },
354
296
{ .name = "disable", .key = 'd',
355
297
.arg = "PLUGIN",
356
298
.doc = "Disable a specific plugin", .group = 1 },
357
{ .name = "enable", .key = 'e',
358
.arg = "PLUGIN",
359
.doc = "Enable a specific plugin", .group = 1 },
360
299
{ .name = "plugin-dir", .key = 128,
361
300
.arg = "DIRECTORY",
362
301
.doc = "Specify a different plugin directory", .group = 2 },
363
{ .name = "config-file", .key = 129,
364
.arg = "FILE",
365
.doc = "Specify a different configuration file", .group = 2 },
366
{ .name = "userid", .key = 130,
367
.arg = "ID", .flags = 0,
368
.doc = "User ID the plugins will run as", .group = 3 },
369
{ .name = "groupid", .key = 131,
370
.arg = "ID", .flags = 0,
371
.doc = "Group ID the plugins will run as", .group = 3 },
372
{ .name = "debug", .key = 132,
373
.doc = "Debug mode", .group = 4 },
302
{ .name = "userid", .key = 129,
303
.arg = "ID", .flags = 0,
304
.doc = "User ID the plugins will run as", .group = 2 },
305
{ .name = "groupid", .key = 130,
306
.arg = "ID", .flags = 0,
307
.doc = "Group ID the plugins will run as", .group = 2 },
308
{ .name = "debug", .key = 131,
309
.doc = "Debug mode", .group = 3 },
374
310
{ .name = NULL }
375
311
};
376
312
377
error_t parse_opt(int key, char *arg, __attribute__((unused))
378
struct argp_state *state) {
379
switch(key) {
380
case 'g': /* --global-options */
381
if(arg != NULL){
313
error_t parse_opt (int key, char *arg, struct argp_state *state) {
314
/* Get the INPUT argument from `argp_parse', which we know is a
315
pointer to our plugin list pointer. */
316
plugin **plugins = state->input;
317
switch (key) {
318
case 'g':
319
if (arg != NULL){
382
320
char *p;
383
321
while((p = strsep(&arg, ",")) != NULL){
384
322
if(p[0] == '\0'){
385
323
continue;
386
324
}
387
if(not add_argument(getplugin(NULL), p)){
325
if(not add_argument(getplugin(NULL, plugins), p)){
388
326
perror("add_argument");
389
327
return ARGP_ERR_UNKNOWN;
390
328
}
391
329
}
392
330
}
393
331
break;
394
case 'G': /* --global-env */
332
case 'e':
395
333
if(arg == NULL){
396
334
break;
397
335
}
398
if(not add_environment(getplugin(NULL), arg, true)){
399
perror("add_environment");
336
{
337
char *envdef = strdup(arg);
338
if(envdef == NULL){
339
break;
340
}
341
if(not add_environment(getplugin(NULL, plugins), envdef)){
342
perror("add_environment");
343
}
400
344
}
401
345
break;
402
case 'o': /* --options-for */
403
if(arg != NULL){
346
case 'o':
347
if (arg != NULL){
404
348
char *p_name = strsep(&arg, ":");
405
if(p_name[0] == '\0' or arg == NULL){
349
if(p_name[0] == '\0'){
406
350
break;
407
351
}
408
352
char *opt = strsep(&arg, ":");
409
if(opt[0] == '\0' or opt == NULL){
353
if(opt[0] == '\0'){
410
354
break;
411
355
}
412
char *p;
413
while((p = strsep(&opt, ",")) != NULL){
414
if(p[0] == '\0'){
415
continue;
416
}
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
356
if(opt != NULL){
357
char *p;
358
while((p = strsep(&opt, ",")) != NULL){
359
if(p[0] == '\0'){
360
continue;
361
}
362
if(not add_argument(getplugin(p_name, plugins), p)){
363
perror("add_argument");
364
return ARGP_ERR_UNKNOWN;
365
}
420
366
}
421
367
}
422
368
}
423
369
break;
424
case 'E': /* --env-for */
370
case 'f':
425
371
if(arg == NULL){
426
372
break;
427
373
}
430
376
if(envdef == NULL){
431
377
break;
432
378
}
433
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
379
char *p_name = strndup(arg, (size_t) (envdef-arg));
380
if(p_name == NULL){
381
break;
382
}
383
envdef++;
384
if(not add_environment(getplugin(p_name, plugins), envdef)){
435
385
perror("add_environment");
436
386
}
437
387
}
438
388
break;
439
case 'd': /* --disable */
440
if(arg != NULL){
441
plugin *p = getplugin(arg);
389
case 'd':
390
if (arg != NULL){
391
plugin *p = getplugin(arg, plugins);
442
392
if(p == NULL){
443
393
return ARGP_ERR_UNKNOWN;
444
394
}
445
395
p->disabled = true;
446
396
}
447
397
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
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
469
if(ret < 1 or tmpmax != (uid_t)tmpmax
470
or arg[numchars] != '\0'){
471
fprintf(stderr, "Bad user ID number: \"%s\", using %"
472
PRIdMAX "\n", arg, (intmax_t)uid);
473
} else {
474
uid = (uid_t)tmpmax;
475
}
476
break;
477
case 131: /* --groupid */
478
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
479
if(ret < 1 or tmpmax != (gid_t)tmpmax
480
or arg[numchars] != '\0'){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
gid = (gid_t)tmpmax;
485
}
486
break;
487
case 132: /* --debug */
398
case 128:
399
plugindir = arg;
400
break;
401
case 129:
402
uid = (uid_t)strtol(arg, NULL, 10);
403
break;
404
case 130:
405
gid = (gid_t)strtol(arg, NULL, 10);
406
break;
407
case 131:
488
408
debug = true;
489
409
break;
490
/*
491
* When adding more options before this line, remember to also add a
492
* "case" to the "parse_opt_config_file" function below.
493
*/
494
case ARGP_KEY_ARG:
495
/* Cryptsetup always passes an argument, which is an empty
496
string if "none" was specified in /etc/crypttab. So if
497
argument was empty, we ignore it silently. */
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
500
}
501
break;
502
case ARGP_KEY_END:
503
break;
504
default:
505
return ARGP_ERR_UNKNOWN;
506
}
507
return 0;
508
}
509
510
/* This option parser is the same as parse_opt() above, except it
511
ignores everything but the --config-file option. */
512
error_t parse_opt_config_file(int key, char *arg,
513
__attribute__((unused))
514
struct argp_state *state) {
515
switch(key) {
516
case 'g': /* --global-options */
517
case 'G': /* --global-env */
518
case 'o': /* --options-for */
519
case 'E': /* --env-for */
520
case 'd': /* --disable */
521
case 'e': /* --enable */
522
case 128: /* --plugin-dir */
523
break;
524
case 129: /* --config-file */
525
free(argfile);
526
argfile = strdup(arg);
527
if(argfile == NULL){
528
perror("strdup");
529
}
530
break;
531
case 130: /* --userid */
532
case 131: /* --groupid */
533
case 132: /* --debug */
534
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
536
break;
537
default:
538
return ARGP_ERR_UNKNOWN;
539
}
540
return 0;
541
}
542
543
struct argp argp = { .options = options,
544
.parser = parse_opt_config_file,
545
.args_doc = "",
410
case ARGP_KEY_ARG:
411
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
412
break;
413
case ARGP_KEY_END:
414
break;
415
default:
416
return ARGP_ERR_UNKNOWN;
417
}
418
return 0;
419
}
420
421
plugin *plugin_list = NULL;
422
423
struct argp argp = { .options = options, .parser = parse_opt,
424
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
546
425
.doc = "Mandos plugin runner -- Run plugins" };
547
426
548
/* Parse using parse_opt_config_file() in order to get the custom
549
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
427
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
428
if (ret == ARGP_ERR_UNKNOWN){
552
429
fprintf(stderr, "Unknown error while parsing arguments\n");
553
430
exitstatus = EXIT_FAILURE;
554
goto fallback;
431
goto end;
555
432
}
556
557
/* Reset to the normal argument parser */
558
argp.parser = parse_opt;
559
560
/* Open the configfile if available */
561
if(argfile == NULL){
562
conffp = fopen(AFILE, "r");
563
} else {
564
conffp = fopen(argfile, "r");
565
}
433
434
conffp = fopen(argfile, "r");
566
435
if(conffp != NULL){
567
436
char *org_line = NULL;
437
size_t size = 0;
438
ssize_t sret;
568
439
char *p, *arg, *new_arg, *line;
569
size_t size = 0;
570
440
const char whitespace_delims[] = " \r\t\f\v\n";
571
441
const char comment_delim[] = "#";
572
442
573
custom_argc = 1;
574
custom_argv = malloc(sizeof(char*) * 2);
575
if(custom_argv == NULL){
576
perror("malloc");
577
exitstatus = EXIT_FAILURE;
578
goto fallback;
579
}
580
custom_argv[0] = argv[0];
581
custom_argv[1] = NULL;
582
583
/* for each line in the config file, strip whitespace and ignore
584
commented text */
585
443
while(true){
586
444
sret = getline(&org_line, &size, conffp);
587
445
if(sret == -1){
595
453
continue;
596
454
}
597
455
new_arg = strdup(p);
598
if(new_arg == NULL){
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
601
free(org_line);
602
goto fallback;
603
}
604
605
custom_argc += 1;
606
custom_argv = realloc(custom_argv, sizeof(char *)
607
* ((unsigned int) custom_argc + 1));
608
if(custom_argv == NULL){
609
perror("realloc");
610
exitstatus = EXIT_FAILURE;
611
free(org_line);
612
goto fallback;
613
}
614
custom_argv[custom_argc-1] = new_arg;
615
custom_argv[custom_argc] = NULL;
456
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
457
if (custom_argv == NULL){
458
perror("add_to_argv");
459
exitstatus = EXIT_FAILURE;
460
goto end;
461
}
616
462
}
617
463
}
618
464
free(org_line);
619
} else {
465
} else{
620
466
/* Check for harmful errors and go to fallback. Other errors might
621
467
not affect opening plugins */
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
468
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
469
perror("fopen");
624
470
exitstatus = EXIT_FAILURE;
625
goto fallback;
471
goto end;
626
472
}
627
473
}
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
474
630
475
if(custom_argv != NULL){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
476
custom_argv[0] = argv[0];
477
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
478
if (ret == ARGP_ERR_UNKNOWN){
634
479
fprintf(stderr, "Unknown error while parsing arguments\n");
635
480
exitstatus = EXIT_FAILURE;
636
goto fallback;
481
goto end;
637
482
}
638
483
}
639
484
640
/* Parse actual command line arguments, to let them override the
641
config file */
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
646
goto fallback;
647
}
648
649
485
if(debug){
650
486
for(plugin *p = plugin_list; p != NULL; p=p->next){
651
487
fprintf(stderr, "Plugin: %s has %d arguments\n",
653
489
for(char **a = p->argv; *a != NULL; a++){
654
490
fprintf(stderr, "\tArg: %s\n", *a);
655
491
}
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
492
fprintf(stderr, "...and %u environment variables\n", p->envc);
657
493
for(char **a = p->environ; *a != NULL; a++){
658
494
fprintf(stderr, "\t%s\n", *a);
659
495
}
660
496
}
661
497
}
662
498
663
/* Strip permissions down to nobody */
664
499
ret = setuid(uid);
665
if(ret == -1){
500
if (ret == -1){
666
501
perror("setuid");
667
}
502
}
503
668
504
setgid(gid);
669
if(ret == -1){
505
if (ret == -1){
670
506
perror("setgid");
671
507
}
672
508
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
677
}
678
509
dir = opendir(plugindir);
679
510
if(dir == NULL){
680
511
perror("Could not open plugin dir");
681
512
exitstatus = EXIT_FAILURE;
682
goto fallback;
513
goto end;
683
514
}
684
515
685
516
/* Set the FD_CLOEXEC flag on the directory, if possible */
690
521
if(ret < 0){
691
522
perror("set_cloexec_flag");
692
523
exitstatus = EXIT_FAILURE;
693
goto fallback;
524
goto end;
694
525
}
695
526
}
696
527
}
697
528
698
529
FD_ZERO(&rfds_all);
699
530
700
/* Read and execute any executable in the plugin directory*/
701
531
while(true){
702
532
dirst = readdir(dir);
703
533
704
/* All directory entries have been processed */
534
// All directory entries have been processed
705
535
if(dirst == NULL){
706
if(errno == EBADF){
536
if (errno == EBADF){
707
537
perror("readdir");
708
538
exitstatus = EXIT_FAILURE;
709
goto fallback;
539
goto end;
710
540
}
711
541
break;
712
542
}
713
543
714
544
d_name_len = strlen(dirst->d_name);
715
545
716
/* Ignore dotfiles, backup files and other junk */
546
// Ignore dotfiles, backup files and other junk
717
547
{
718
548
bool bad_name = false;
719
549
721
551
722
552
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
723
553
".dpkg-old",
724
".dpkg-bak",
725
554
".dpkg-divert", NULL };
726
555
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
727
556
size_t pre_len = strlen(*pre);
735
564
break;
736
565
}
737
566
}
567
738
568
if(bad_name){
739
569
continue;
740
570
}
571
741
572
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
742
573
size_t suf_len = strlen(*suf);
743
574
if((d_name_len >= suf_len)
758
589
}
759
590
760
591
char *filename;
761
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
763
} else {
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
765
}
592
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
593
if(ret < 0){
767
594
perror("asprintf");
768
595
continue;
769
596
}
770
597
771
598
ret = stat(filename, &st);
772
if(ret == -1){
599
if (ret == -1){
773
600
perror("stat");
774
601
free(filename);
775
602
continue;
776
603
}
777
778
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
604
605
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
780
606
if(debug){
781
607
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
782
608
" with bad type or mode\n", filename);
784
610
free(filename);
785
611
continue;
786
612
}
787
788
plugin *p = getplugin(dirst->d_name);
613
plugin *p = getplugin(dirst->d_name, &plugin_list);
789
614
if(p == NULL){
790
615
perror("getplugin");
791
616
free(filename);
801
626
}
802
627
{
803
628
/* Add global arguments to argument list for this plugin */
804
plugin *g = getplugin(NULL);
629
plugin *g = getplugin(NULL, &plugin_list);
805
630
if(g != NULL){
806
631
for(char **a = g->argv + 1; *a != NULL; a++){
807
632
if(not add_argument(p, *a)){
810
635
}
811
636
/* Add global environment variables */
812
637
for(char **e = g->environ; *e != NULL; e++){
813
if(not add_environment(p, *e, false)){
638
if(not add_environment(p, *e)){
814
639
perror("add_environment");
815
640
}
816
641
}
821
646
process, too. */
822
647
if(p->environ[0] != NULL){
823
648
for(char **e = environ; *e != NULL; e++){
824
if(not add_environment(p, *e, false)){
649
char *copy = strdup(*e);
650
if(copy == NULL){
651
perror("strdup");
652
continue;
653
}
654
if(not add_environment(p, copy)){
825
655
perror("add_environment");
826
656
}
827
657
}
828
658
}
829
659
830
int pipefd[2];
660
int pipefd[2];
831
661
ret = pipe(pipefd);
832
if(ret == -1){
662
if (ret == -1){
833
663
perror("pipe");
834
664
exitstatus = EXIT_FAILURE;
835
goto fallback;
665
goto end;
836
666
}
837
/* Ask OS to automatic close the pipe on exec */
838
667
ret = set_cloexec_flag(pipefd[0]);
839
668
if(ret < 0){
840
669
perror("set_cloexec_flag");
841
670
exitstatus = EXIT_FAILURE;
842
goto fallback;
671
goto end;
843
672
}
844
673
ret = set_cloexec_flag(pipefd[1]);
845
674
if(ret < 0){
846
675
perror("set_cloexec_flag");
847
676
exitstatus = EXIT_FAILURE;
848
goto fallback;
677
goto end;
849
678
}
850
679
/* Block SIGCHLD until process is safely in process list */
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
680
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
852
681
if(ret < 0){
853
682
perror("sigprocmask");
854
683
exitstatus = EXIT_FAILURE;
855
goto fallback;
684
goto end;
856
685
}
857
/* Starting a new process to be watched */
686
// Starting a new process to be watched
858
687
pid_t pid = fork();
859
688
if(pid == -1){
860
689
perror("fork");
861
690
exitstatus = EXIT_FAILURE;
862
goto fallback;
691
goto end;
863
692
}
864
693
if(pid == 0){
865
694
/* this is the child process */
868
697
perror("sigaction");
869
698
_exit(EXIT_FAILURE);
870
699
}
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
700
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
701
if(ret < 0){
873
702
perror("sigprocmask");
874
703
_exit(EXIT_FAILURE);
875
704
}
876
705
877
706
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
878
707
if(ret == -1){
879
708
perror("dup2");
898
727
}
899
728
/* no return */
900
729
}
901
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
730
/* parent process */
903
731
free(filename);
904
plugin *new_plugin = getplugin(dirst->d_name);
905
if(new_plugin == NULL){
906
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
732
close(pipefd[1]); /* close unused write end of pipe */
733
process *new_process = malloc(sizeof(process));
734
if (new_process == NULL){
735
perror("malloc");
736
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
908
737
if(ret < 0){
909
perror("sigprocmask");
738
perror("sigprocmask");
910
739
}
911
740
exitstatus = EXIT_FAILURE;
912
goto fallback;
741
goto end;
913
742
}
914
743
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
917
744
*new_process = (struct process){ .pid = pid,
745
.fd = pipefd[0],
746
.next = process_list };
747
// List handling
748
process_list = new_process;
918
749
/* Unblock SIGCHLD so signal handler can be run if this process
919
750
has already completed */
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
751
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
921
752
if(ret < 0){
922
753
perror("sigprocmask");
923
754
exitstatus = EXIT_FAILURE;
924
goto fallback;
925
}
926
927
FD_SET(new_plugin->fd, &rfds_all);
928
929
if(maxfd < new_plugin->fd){
930
maxfd = new_plugin->fd;
931
}
755
goto end;
756
}
757
758
FD_SET(new_process->fd, &rfds_all);
759
760
if (maxfd < new_process->fd){
761
maxfd = new_process->fd;
762
}
763
764
}
765
766
/* Free the plugin list */
767
for(plugin *next; plugin_list != NULL; plugin_list = next){
768
next = plugin_list->next;
769
free(plugin_list->argv);
770
if(plugin_list->environ[0] != NULL){
771
for(char **e = plugin_list->environ; *e != NULL; e++){
772
free(*e);
773
}
774
}
775
free(plugin_list);
932
776
}
933
777
934
778
closedir(dir);
935
779
dir = NULL;
936
937
for(plugin *p = plugin_list; p != NULL; p = p->next){
938
if(p->pid != 0){
939
break;
940
}
941
if(p->next == NULL){
942
fprintf(stderr, "No plugin processes started. Incorrect plugin"
943
" directory?\n");
944
free_plugin_list();
945
}
780
781
if (process_list == NULL){
782
fprintf(stderr, "No plugin processes started. Incorrect plugin"
783
" directory?\n");
784
process_list = NULL;
946
785
}
947
948
/* Main loop while running plugins exist */
949
while(plugin_list){
786
while(process_list){
950
787
fd_set rfds = rfds_all;
951
788
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
952
if(select_ret == -1){
789
if (select_ret == -1){
953
790
perror("select");
954
791
exitstatus = EXIT_FAILURE;
955
goto fallback;
792
goto end;
956
793
}
957
794
/* OK, now either a process completed, or something can be read
958
795
from one of them */
959
for(plugin *proc = plugin_list; proc != NULL;){
796
for(process *proc = process_list; proc ; proc = proc->next){
960
797
/* Is this process completely done? */
961
798
if(proc->eof and proc->completed){
962
799
/* Only accept the plugin output if it exited cleanly */
963
800
if(not WIFEXITED(proc->status)
964
801
or WEXITSTATUS(proc->status) != 0){
965
802
/* Bad exit by plugin */
966
967
803
if(debug){
968
804
if(WIFEXITED(proc->status)){
969
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
970
" %d\n", (intmax_t) (proc->pid),
805
fprintf(stderr, "Plugin %u exited with status %d\n",
806
(unsigned int) (proc->pid),
971
807
WEXITSTATUS(proc->status));
972
808
} else if(WIFSIGNALED(proc->status)) {
973
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
974
" %d\n", (intmax_t) (proc->pid),
809
fprintf(stderr, "Plugin %u killed by signal %d\n",
810
(unsigned int) (proc->pid),
975
811
WTERMSIG(proc->status));
976
812
} else if(WCOREDUMP(proc->status)){
977
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
978
(intmax_t) (proc->pid));
813
fprintf(stderr, "Plugin %d dumped core\n",
814
(unsigned int) (proc->pid));
979
815
}
980
816
}
981
982
817
/* Remove the plugin */
983
818
FD_CLR(proc->fd, &rfds_all);
984
985
819
/* Block signal while modifying process_list */
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
820
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
987
821
if(ret < 0){
988
822
perror("sigprocmask");
989
823
exitstatus = EXIT_FAILURE;
990
goto fallback;
991
}
992
993
plugin *next_plugin = proc->next;
994
free_plugin(proc);
995
proc = next_plugin;
996
824
goto end;
825
}
826
/* Delete this process entry from the list */
827
if(process_list == proc){
828
/* First one - simple */
829
process_list = proc->next;
830
} else {
831
/* Second one or later */
832
for(process *p = process_list; p != NULL; p = p->next){
833
if(p->next == proc){
834
p->next = proc->next;
835
break;
836
}
837
}
838
}
997
839
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
841
NULL);
1000
842
if(ret < 0){
1001
843
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1003
goto fallback;
1004
}
1005
1006
if(plugin_list == NULL){
1007
break;
1008
}
1009
1010
continue;
844
}
845
free(proc->buffer);
846
free(proc);
847
/* We deleted this process from the list, so we can't go
848
proc->next. Therefore, start over from the beginning of
849
the process list */
850
break;
1011
851
}
1012
1013
852
/* This process exited nicely, so print its buffer */
1014
1015
bool bret = print_out_password(proc->buffer,
1016
proc->buffer_length);
853
854
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1017
855
if(not bret){
1018
856
perror("print_out_password");
1019
857
exitstatus = EXIT_FAILURE;
1020
858
}
1021
goto fallback;
859
goto end;
1022
860
}
1023
1024
861
/* This process has not completed. Does it have any output? */
1025
862
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1026
863
/* This process had nothing to say at this time */
1027
proc = proc->next;
1028
864
continue;
1029
865
}
1030
866
/* Before reading, make the process' data buffer large enough */
1031
867
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1032
868
proc->buffer = realloc(proc->buffer, proc->buffer_size
1033
869
+ (size_t) BUFFER_SIZE);
1034
if(proc->buffer == NULL){
870
if (proc->buffer == NULL){
1035
871
perror("malloc");
1036
872
exitstatus = EXIT_FAILURE;
1037
goto fallback;
873
goto end;
1038
874
}
1039
875
proc->buffer_size += BUFFER_SIZE;
1040
876
}
1041
877
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1044
if(sret < 0){
878
ret = read(proc->fd, proc->buffer + proc->buffer_length,
879
BUFFER_SIZE);
880
if(ret < 0){
1045
881
/* Read error from this process; ignore the error */
1046
proc = proc->next;
1047
882
continue;
1048
883
}
1049
if(sret == 0){
884
if(ret == 0){
1050
885
/* got EOF */
1051
886
proc->eof = true;
1052
887
} else {
1053
proc->buffer_length += (size_t) sret;
888
proc->buffer_length += (size_t) ret;
1054
889
}
1055
890
}
1056
891
}
1057
892
1058
893
1059
fallback:
894
end:
1060
895
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1062
/* Fallback if all plugins failed, none are found or an error
1063
occured */
896
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
897
/* Fallback if all plugins failed, none are found or an error occured */
1064
898
bool bret;
1065
899
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1066
900
char *passwordbuffer = getpass("Password: ");
1067
size_t len = strlen(passwordbuffer);
1068
/* Strip trailing newline */
1069
if(len > 0 and passwordbuffer[len-1] == '\n'){
1070
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1071
len--;
1072
}
1073
bret = print_out_password(passwordbuffer, len);
901
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1074
902
if(not bret){
1075
903
perror("print_out_password");
1076
904
exitstatus = EXIT_FAILURE;
905
goto end;
1077
906
}
1078
907
}
1079
908
1080
909
/* Restore old signal handler */
1081
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1082
if(ret == -1){
1083
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1085
}
1086
1087
if(custom_argv != NULL){
1088
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1089
free(*arg);
910
sigaction(SIGCHLD, &old_sigchld_action, NULL);
911
912
free(custom_argv);
913
914
/* Free the plugin list */
915
for(plugin *next; plugin_list != NULL; plugin_list = next){
916
next = plugin_list->next;
917
free(plugin_list->argv);
918
if(plugin_list->environ[0] != NULL){
919
for(char **e = plugin_list->environ; *e != NULL; e++){
920
free(*e);
921
}
1090
922
}
1091
free(custom_argv);
923
free(plugin_list->environ);
924
free(plugin_list);
1092
925
}
1093
926
1094
927
if(dir != NULL){
1095
928
closedir(dir);
1096
929
}
1097
930
1098
/* Kill the processes */
1099
for(plugin *p = plugin_list; p != NULL; p = p->next){
1100
if(p->pid != 0){
1101
close(p->fd);
1102
ret = kill(p->pid, SIGTERM);
1103
if(ret == -1 and errno != ESRCH){
1104
/* Set-uid proccesses might not get closed */
1105
perror("kill");
1106
}
931
/* Free the process list and kill the processes */
932
for(process *next; process_list != NULL; process_list = next){
933
next = process_list->next;
934
close(process_list->fd);
935
ret = kill(process_list->pid, SIGTERM);
936
if(ret == -1 and errno != ESRCH){
937
/* set-uid proccesses migth not get closed */
938
perror("kill");
1107
939
}
940
free(process_list->buffer);
941
free(process_list);
1108
942
}
1109
943
1110
944
/* Wait for any remaining child processes to terminate */
1115
949
perror("wait");
1116
950
}
1117
951
1118
free_plugin_list();
1119
1120
free(plugindir);
1121
free(argfile);
1122
1123
952
return exitstatus;
1124
953
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0