To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 24.1.127
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.127
- Committer: Björn Påhlsson
- Date: 2009-01-19 05:59:35 UTC
- mfrom: (278 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 291.
- Revision ID: belorn@braxen-20090119055935-0ce8dnr4hvz5m5v2
merge
- 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
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
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
26
27
#include <stddef.h> /* size_t, NULL */
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,
46
47
fcntl(), setuid(), setgid(),
47
48
F_GETFD, F_SETFD, FD_CLOEXEC,
48
49
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
dup2(), STDOUT_FILENO, _exit(),
50
51
execv(), write(), read(),
51
52
close() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
54
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), strcpy(),
55
strcat() */
55
#include <string.h> /* strsep, strlen(), asprintf() */
56
56
#include <errno.h> /* errno */
57
57
#include <argp.h> /* struct argp_option, struct
58
58
argp_state, struct argp,
59
59
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
61
62
#include <signal.h> /* struct sigaction, sigemptyset(),
62
63
sigaddset(), sigaction(),
63
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
65
SIG_UNBLOCK, kill() */
65
66
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
66
68
67
69
#define BUFFER_SIZE 256
68
#define ARGFILE "/conf/conf.d/mandos/plugins.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
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;
71
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
76
73
struct process;
77
typedef struct plugin{
78
char *name; /* can be NULL or any plugin name */
79
char **argv;
80
int argc;
81
char **environ;
82
int envc;
83
bool disabled;
74
84
75
typedef struct process{
85
/* Variables used for running processes*/
76
86
pid_t pid;
77
87
int fd;
78
88
char *buffer;
79
89
size_t buffer_size;
80
90
size_t buffer_length;
81
91
bool eof;
82
bool completed;
83
int status;
84
struct process *next;
85
} process;
86
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
89
char **argv;
90
int argc;
91
bool disabled;
92
volatile bool completed;
93
volatile int status;
92
94
struct plugin *next;
93
95
} plugin;
94
96
95
static plugin *getplugin(char *name, plugin **plugin_list){
96
for (plugin *p = *plugin_list; p != NULL; p = p->next){
97
if ((p->name == name)
98
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
99
106
return p;
100
107
}
101
108
}
102
109
/* Create a new plugin */
103
110
plugin *new_plugin = malloc(sizeof(plugin));
104
if (new_plugin == NULL){
105
perror("malloc");
106
exit(EXIT_FAILURE);
107
}
108
new_plugin->name = name;
111
if(new_plugin == NULL){
112
return NULL;
113
}
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
free(new_plugin);
119
return NULL;
120
}
121
}
122
123
*new_plugin = (plugin) { .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
127
109
128
new_plugin->argv = malloc(sizeof(char *) * 2);
110
if (new_plugin->argv == NULL){
111
perror("malloc");
112
exit(EXIT_FAILURE);
129
if(new_plugin->argv == NULL){
130
free(copy_name);
131
free(new_plugin);
132
return NULL;
113
133
}
114
new_plugin->argv[0] = name;
134
new_plugin->argv[0] = copy_name;
115
135
new_plugin->argv[1] = NULL;
116
new_plugin->argc = 1;
117
new_plugin->disabled = false;
118
new_plugin->next = *plugin_list;
136
137
new_plugin->environ = malloc(sizeof(char *));
138
if(new_plugin->environ == NULL){
139
free(copy_name);
140
free(new_plugin->argv);
141
free(new_plugin);
142
return NULL;
143
}
144
new_plugin->environ[0] = NULL;
145
119
146
/* Append the new plugin to the list */
120
*plugin_list = new_plugin;
147
plugin_list = new_plugin;
121
148
return new_plugin;
122
149
}
123
150
124
static void addargument(plugin *p, char *arg){
125
p->argv[p->argc] = arg;
126
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
127
if (p->argv == NULL){
128
perror("malloc");
129
exit(EXIT_FAILURE);
130
}
131
p->argc++;
132
p->argv[p->argc] = NULL;
151
/* Helper function for add_argument and add_environment */
152
static bool add_to_char_array(const char *new, char ***array,
153
int *len){
154
/* Resize the pointed-to array to hold one more pointer */
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
157
/* Malloc check */
158
if(*array == NULL){
159
return false;
160
}
161
/* Make a copy of the new string */
162
char *copy = strdup(new);
163
if(copy == NULL){
164
return false;
165
}
166
/* Insert the copy */
167
(*array)[*len] = copy;
168
(*len)++;
169
/* Add a new terminating NULL pointer to the last element */
170
(*array)[*len] = NULL;
171
return true;
172
}
173
174
/* Add to a plugin's argument vector */
175
static bool add_argument(plugin *p, const char *arg){
176
if(p == NULL){
177
return false;
178
}
179
return add_to_char_array(arg, &(p->argv), &(p->argc));
180
}
181
182
/* Add to a plugin's environment */
183
static bool add_environment(plugin *p, const char *def, bool replace){
184
if(p == NULL){
185
return false;
186
}
187
/* namelen = length of name of environment variable */
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
192
/* It already exists */
193
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
196
return false;
197
}
198
*e = new;
199
strcpy(*e, def);
200
}
201
return true;
202
}
203
}
204
return add_to_char_array(def, &(p->environ), &(p->envc));
133
205
}
134
206
135
207
/*
137
209
* Descriptor Flags".
138
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
139
211
*/
140
static int set_cloexec_flag(int fd)
141
{
212
static int set_cloexec_flag(int fd){
142
213
int ret = fcntl(fd, F_GETFD, 0);
143
214
/* If reading the flags failed, return error indication now. */
144
215
if(ret < 0){
148
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
149
220
}
150
221
151
process *process_list = NULL;
152
222
153
/* Mark a process as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
154
224
status. */
155
void handle_sigchld(__attribute__((unused)) int sig){
156
process *proc = process_list;
157
int status;
158
pid_t pid = wait(&status);
159
if(pid == -1){
160
perror("wait");
161
return;
162
}
163
while(proc != NULL and proc->pid != pid){
164
proc = proc->next;
165
}
166
if(proc == NULL){
167
/* Process not found in process list */
168
return;
169
}
170
proc->status = status;
171
proc->completed = true;
225
static void handle_sigchld(__attribute__((unused)) int sig){
226
while(true){
227
plugin *proc = plugin_list;
228
int status;
229
pid_t pid = waitpid(-1, &status, WNOHANG);
230
if(pid == 0){
231
/* Only still running child processes */
232
break;
233
}
234
if(pid == -1){
235
if(errno != ECHILD){
236
perror("waitpid");
237
}
238
/* No child processes */
239
break;
240
}
241
242
/* A child exited, find it in process_list */
243
while(proc != NULL and proc->pid != pid){
244
proc = proc->next;
245
}
246
if(proc == NULL){
247
/* Process not found in process list */
248
continue;
249
}
250
proc->status = status;
251
proc->completed = true;
252
}
172
253
}
173
254
174
bool print_out_password(const char *buffer, size_t length){
255
/* Prints out a password to stdout */
256
static bool print_out_password(const char *buffer, size_t length){
175
257
ssize_t ret;
176
if(length>0 and buffer[length-1] == '\n'){
177
length--;
178
}
179
258
for(size_t written = 0; written < length; written += (size_t)ret){
180
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
181
260
length - written));
186
265
return true;
187
266
}
188
267
189
char ** addcustomargument(char **argv, int *argc, char *arg){
268
/* Removes and free a plugin from the plugin list */
269
static void free_plugin(plugin *plugin_node){
270
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
272
free(*arg);
273
}
274
free(plugin_node->argv);
275
for(char **env = plugin_node->environ; *env != NULL; env++){
276
free(*env);
277
}
278
free(plugin_node->environ);
279
free(plugin_node->buffer);
190
280
191
if (argv == NULL){
192
*argc = 1;
193
argv = malloc(sizeof(char*) * 2);
194
if(argv == NULL){
195
return NULL;
281
/* Removes the plugin from the singly-linked list */
282
if(plugin_node == plugin_list){
283
/* First one - simple */
284
plugin_list = plugin_list->next;
285
} else {
286
/* Second one or later */
287
for(plugin *p = plugin_list; p != NULL; p = p->next){
288
if(p->next == plugin_node){
289
p->next = plugin_node->next;
290
break;
291
}
196
292
}
197
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
198
argv[1] = NULL;
199
}
200
*argc += 1;
201
argv = realloc(argv, sizeof(char *)
202
* ((unsigned int) *argc + 1));
203
if(argv == NULL){
204
return NULL;
205
}
206
argv[*argc-1] = arg;
207
argv[*argc] = NULL;
208
return argv;
293
}
294
295
free(plugin_node);
296
}
297
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
301
}
209
302
}
210
303
211
304
int main(int argc, char *argv[]){
212
const char *plugindir = "/lib/mandos/plugins.d";
213
const char *argfile = ARGFILE;
305
char *plugindir = NULL;
306
char *argfile = NULL;
214
307
FILE *conffp;
215
308
size_t d_name_len;
216
309
DIR *dir = NULL;
217
310
struct dirent *dirst;
218
311
struct stat st;
219
312
fd_set rfds_all;
220
int ret, maxfd = 0;
313
int ret, numchars, maxfd = 0;
314
ssize_t sret;
315
intmax_t tmpmax;
221
316
uid_t uid = 65534;
222
317
gid_t gid = 65534;
223
318
bool debug = false;
231
326
/* Establish a signal handler */
232
327
sigemptyset(&sigchld_action.sa_mask);
233
328
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
234
if(ret < 0){
329
if(ret == -1){
235
330
perror("sigaddset");
236
exit(EXIT_FAILURE);
331
exitstatus = EXIT_FAILURE;
332
goto fallback;
237
333
}
238
334
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
239
if(ret < 0){
335
if(ret == -1){
240
336
perror("sigaction");
241
exit(EXIT_FAILURE);
337
exitstatus = EXIT_FAILURE;
338
goto fallback;
242
339
}
243
340
244
341
/* The options we understand. */
246
343
{ .name = "global-options", .key = 'g',
247
344
.arg = "OPTION[,OPTION[,...]]",
248
345
.doc = "Options passed to all plugins" },
346
{ .name = "global-env", .key = 'G',
347
.arg = "VAR=value",
348
.doc = "Environment variable passed to all plugins" },
249
349
{ .name = "options-for", .key = 'o',
250
350
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
251
351
.doc = "Options passed only to specified plugin" },
352
{ .name = "env-for", .key = 'E',
353
.arg = "PLUGIN:ENV=value",
354
.doc = "Environment variable passed to specified plugin" },
252
355
{ .name = "disable", .key = 'd',
253
356
.arg = "PLUGIN",
254
357
.doc = "Disable a specific plugin", .group = 1 },
358
{ .name = "enable", .key = 'e',
359
.arg = "PLUGIN",
360
.doc = "Enable a specific plugin", .group = 1 },
255
361
{ .name = "plugin-dir", .key = 128,
256
362
.arg = "DIRECTORY",
257
363
.doc = "Specify a different plugin directory", .group = 2 },
258
{ .name = "userid", .key = 129,
259
.arg = "ID", .flags = 0,
260
.doc = "User ID the plugins will run as", .group = 2 },
261
{ .name = "groupid", .key = 130,
262
.arg = "ID", .flags = 0,
263
.doc = "Group ID the plugins will run as", .group = 2 },
264
{ .name = "debug", .key = 131,
265
.doc = "Debug mode", .group = 3 },
364
{ .name = "config-file", .key = 129,
365
.arg = "FILE",
366
.doc = "Specify a different configuration file", .group = 2 },
367
{ .name = "userid", .key = 130,
368
.arg = "ID", .flags = 0,
369
.doc = "User ID the plugins will run as", .group = 3 },
370
{ .name = "groupid", .key = 131,
371
.arg = "ID", .flags = 0,
372
.doc = "Group ID the plugins will run as", .group = 3 },
373
{ .name = "debug", .key = 132,
374
.doc = "Debug mode", .group = 4 },
266
375
{ .name = NULL }
267
376
};
268
377
269
error_t parse_opt (int key, char *arg, struct argp_state *state) {
270
/* Get the INPUT argument from `argp_parse', which we know is a
271
pointer to our plugin list pointer. */
272
plugin **plugins = state->input;
273
switch (key) {
274
case 'g':
275
if (arg != NULL){
378
error_t parse_opt(int key, char *arg, __attribute__((unused))
379
struct argp_state *state) {
380
switch(key) {
381
case 'g': /* --global-options */
382
if(arg != NULL){
276
383
char *p;
277
384
while((p = strsep(&arg, ",")) != NULL){
278
385
if(p[0] == '\0'){
279
386
continue;
280
387
}
281
addargument(getplugin(NULL, plugins), p);
388
if(not add_argument(getplugin(NULL), p)){
389
perror("add_argument");
390
return ARGP_ERR_UNKNOWN;
391
}
282
392
}
283
393
}
284
394
break;
285
case 'o':
286
if (arg != NULL){
287
char *name = strsep(&arg, ":");
288
if(name[0] == '\0'){
395
case 'G': /* --global-env */
396
if(arg == NULL){
397
break;
398
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
401
}
402
break;
403
case 'o': /* --options-for */
404
if(arg != NULL){
405
char *p_name = strsep(&arg, ":");
406
if(p_name[0] == '\0' or arg == NULL){
289
407
break;
290
408
}
291
409
char *opt = strsep(&arg, ":");
292
if(opt[0] == '\0'){
293
break;
294
}
295
if(opt != NULL){
296
char *p;
297
while((p = strsep(&opt, ",")) != NULL){
298
if(p[0] == '\0'){
299
continue;
300
}
301
addargument(getplugin(name, plugins), p);
302
}
303
}
304
}
305
break;
306
case 'd':
307
if (arg != NULL){
308
getplugin(arg, plugins)->disabled = true;
309
}
310
break;
311
case 128:
312
plugindir = arg;
313
break;
314
case 129:
315
uid = (uid_t)strtol(arg, NULL, 10);
316
break;
317
case 130:
318
gid = (gid_t)strtol(arg, NULL, 10);
319
break;
320
case 131:
410
if(opt[0] == '\0' or opt == NULL){
411
break;
412
}
413
char *p;
414
while((p = strsep(&opt, ",")) != NULL){
415
if(p[0] == '\0'){
416
continue;
417
}
418
if(not add_argument(getplugin(p_name), p)){
419
perror("add_argument");
420
return ARGP_ERR_UNKNOWN;
421
}
422
}
423
}
424
break;
425
case 'E': /* --env-for */
426
if(arg == NULL){
427
break;
428
}
429
{
430
char *envdef = strchr(arg, ':');
431
if(envdef == NULL){
432
break;
433
}
434
*envdef = '\0';
435
if(not add_environment(getplugin(arg), envdef+1, true)){
436
perror("add_environment");
437
}
438
}
439
break;
440
case 'd': /* --disable */
441
if(arg != NULL){
442
plugin *p = getplugin(arg);
443
if(p == NULL){
444
return ARGP_ERR_UNKNOWN;
445
}
446
p->disabled = true;
447
}
448
break;
449
case 'e': /* --enable */
450
if(arg != NULL){
451
plugin *p = getplugin(arg);
452
if(p == NULL){
453
return ARGP_ERR_UNKNOWN;
454
}
455
p->disabled = false;
456
}
457
break;
458
case 128: /* --plugin-dir */
459
free(plugindir);
460
plugindir = strdup(arg);
461
if(plugindir == NULL){
462
perror("strdup");
463
}
464
break;
465
case 129: /* --config-file */
466
/* This is already done by parse_opt_config_file() */
467
break;
468
case 130: /* --userid */
469
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
470
if(ret < 1 or tmpmax != (uid_t)tmpmax
471
or arg[numchars] != '\0'){
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
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
480
if(ret < 1 or tmpmax != (gid_t)tmpmax
481
or arg[numchars] != '\0'){
482
fprintf(stderr, "Bad group ID number: \"%s\", using %"
483
PRIdMAX "\n", arg, (intmax_t)gid);
484
} else {
485
gid = (gid_t)tmpmax;
486
}
487
break;
488
case 132: /* --debug */
321
489
debug = true;
322
490
break;
323
case ARGP_KEY_ARG:
324
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
325
break;
326
case ARGP_KEY_END:
327
break;
328
default:
329
return ARGP_ERR_UNKNOWN;
330
}
331
return 0;
332
}
333
334
plugin *plugin_list = NULL;
335
336
struct argp argp = { .options = options, .parser = parse_opt,
337
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
491
/*
492
* When adding more options before this line, remember to also add a
493
* "case" to the "parse_opt_config_file" function below.
494
*/
495
case ARGP_KEY_ARG:
496
/* Cryptsetup always passes an argument, which is an empty
497
string if "none" was specified in /etc/crypttab. So if
498
argument was empty, we ignore it silently. */
499
if(arg[0] != '\0'){
500
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
501
}
502
break;
503
case ARGP_KEY_END:
504
break;
505
default:
506
return ARGP_ERR_UNKNOWN;
507
}
508
return 0;
509
}
510
511
/* This option parser is the same as parse_opt() above, except it
512
ignores everything but the --config-file option. */
513
error_t parse_opt_config_file(int key, char *arg,
514
__attribute__((unused))
515
struct argp_state *state) {
516
switch(key) {
517
case 'g': /* --global-options */
518
case 'G': /* --global-env */
519
case 'o': /* --options-for */
520
case 'E': /* --env-for */
521
case 'd': /* --disable */
522
case 'e': /* --enable */
523
case 128: /* --plugin-dir */
524
break;
525
case 129: /* --config-file */
526
free(argfile);
527
argfile = strdup(arg);
528
if(argfile == NULL){
529
perror("strdup");
530
}
531
break;
532
case 130: /* --userid */
533
case 131: /* --groupid */
534
case 132: /* --debug */
535
case ARGP_KEY_ARG:
536
case ARGP_KEY_END:
537
break;
538
default:
539
return ARGP_ERR_UNKNOWN;
540
}
541
return 0;
542
}
543
544
struct argp argp = { .options = options,
545
.parser = parse_opt_config_file,
546
.args_doc = "",
338
547
.doc = "Mandos plugin runner -- Run plugins" };
339
548
340
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
341
if (ret == ARGP_ERR_UNKNOWN){
549
/* Parse using parse_opt_config_file() in order to get the custom
550
config file location, if any. */
551
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
552
if(ret == ARGP_ERR_UNKNOWN){
342
553
fprintf(stderr, "Unknown error while parsing arguments\n");
343
554
exitstatus = EXIT_FAILURE;
344
goto end;
555
goto fallback;
345
556
}
346
347
conffp = fopen(argfile, "r");
557
558
/* Reset to the normal argument parser */
559
argp.parser = parse_opt;
560
561
/* Open the configfile if available */
562
if(argfile == NULL){
563
conffp = fopen(AFILE, "r");
564
} else {
565
conffp = fopen(argfile, "r");
566
}
348
567
if(conffp != NULL){
349
568
char *org_line = NULL;
569
char *p, *arg, *new_arg, *line;
350
570
size_t size = 0;
351
ssize_t sret;
352
char *p, *arg, *new_arg, *line;
353
571
const char whitespace_delims[] = " \r\t\f\v\n";
354
572
const char comment_delim[] = "#";
355
573
574
custom_argc = 1;
575
custom_argv = malloc(sizeof(char*) * 2);
576
if(custom_argv == NULL){
577
perror("malloc");
578
exitstatus = EXIT_FAILURE;
579
goto fallback;
580
}
581
custom_argv[0] = argv[0];
582
custom_argv[1] = NULL;
583
584
/* for each line in the config file, strip whitespace and ignore
585
commented text */
356
586
while(true){
357
587
sret = getline(&org_line, &size, conffp);
358
588
if(sret == -1){
366
596
continue;
367
597
}
368
598
new_arg = strdup(p);
369
custom_argv = addcustomargument(custom_argv, &custom_argc, new_arg);
370
if (custom_argv == NULL){
371
perror("addcustomargument");
372
exitstatus = EXIT_FAILURE;
373
goto end;
374
}
599
if(new_arg == NULL){
600
perror("strdup");
601
exitstatus = EXIT_FAILURE;
602
free(org_line);
603
goto fallback;
604
}
605
606
custom_argc += 1;
607
custom_argv = realloc(custom_argv, sizeof(char *)
608
* ((unsigned int) custom_argc + 1));
609
if(custom_argv == NULL){
610
perror("realloc");
611
exitstatus = EXIT_FAILURE;
612
free(org_line);
613
goto fallback;
614
}
615
custom_argv[custom_argc-1] = new_arg;
616
custom_argv[custom_argc] = NULL;
375
617
}
376
618
}
377
619
free(org_line);
378
} else{
620
} else {
379
621
/* Check for harmful errors and go to fallback. Other errors might
380
622
not affect opening plugins */
381
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
382
624
perror("fopen");
383
625
exitstatus = EXIT_FAILURE;
384
goto end;
626
goto fallback;
385
627
}
386
628
}
387
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
388
631
if(custom_argv != NULL){
389
custom_argv[0] = argv[0];
390
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
391
if (ret == ARGP_ERR_UNKNOWN){
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
0, NULL);
634
if(ret == ARGP_ERR_UNKNOWN){
392
635
fprintf(stderr, "Unknown error while parsing arguments\n");
393
636
exitstatus = EXIT_FAILURE;
394
goto end;
637
goto fallback;
395
638
}
396
639
}
397
640
641
/* Parse actual command line arguments, to let them override the
642
config file */
643
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
644
if(ret == ARGP_ERR_UNKNOWN){
645
fprintf(stderr, "Unknown error while parsing arguments\n");
646
exitstatus = EXIT_FAILURE;
647
goto fallback;
648
}
649
398
650
if(debug){
399
651
for(plugin *p = plugin_list; p != NULL; p=p->next){
400
652
fprintf(stderr, "Plugin: %s has %d arguments\n",
402
654
for(char **a = p->argv; *a != NULL; a++){
403
655
fprintf(stderr, "\tArg: %s\n", *a);
404
656
}
657
fprintf(stderr, "...and %d environment variables\n", p->envc);
658
for(char **a = p->environ; *a != NULL; a++){
659
fprintf(stderr, "\t%s\n", *a);
660
}
405
661
}
406
662
}
407
663
664
/* Strip permissions down to nobody */
408
665
ret = setuid(uid);
409
if (ret == -1){
666
if(ret == -1){
410
667
perror("setuid");
411
}
412
668
}
413
669
setgid(gid);
414
if (ret == -1){
670
if(ret == -1){
415
671
perror("setgid");
416
672
}
417
673
418
dir = opendir(plugindir);
674
if(plugindir == NULL){
675
dir = opendir(PDIR);
676
} else {
677
dir = opendir(plugindir);
678
}
679
419
680
if(dir == NULL){
420
681
perror("Could not open plugin dir");
421
682
exitstatus = EXIT_FAILURE;
422
goto end;
683
goto fallback;
423
684
}
424
685
425
686
/* Set the FD_CLOEXEC flag on the directory, if possible */
430
691
if(ret < 0){
431
692
perror("set_cloexec_flag");
432
693
exitstatus = EXIT_FAILURE;
433
goto end;
694
goto fallback;
434
695
}
435
696
}
436
697
}
437
698
438
699
FD_ZERO(&rfds_all);
439
700
701
/* Read and execute any executable in the plugin directory*/
440
702
while(true){
441
703
dirst = readdir(dir);
442
704
443
// All directory entries have been processed
705
/* All directory entries have been processed */
444
706
if(dirst == NULL){
445
if (errno == EBADF){
707
if(errno == EBADF){
446
708
perror("readdir");
447
709
exitstatus = EXIT_FAILURE;
448
goto end;
710
goto fallback;
449
711
}
450
712
break;
451
713
}
452
714
453
715
d_name_len = strlen(dirst->d_name);
454
716
455
// Ignore dotfiles, backup files and other junk
717
/* Ignore dotfiles, backup files and other junk */
456
718
{
457
719
bool bad_name = false;
458
720
460
722
461
723
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
462
724
".dpkg-old",
725
".dpkg-bak",
463
726
".dpkg-divert", NULL };
464
727
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
465
728
size_t pre_len = strlen(*pre);
473
736
break;
474
737
}
475
738
}
476
477
739
if(bad_name){
478
740
continue;
479
741
}
480
481
742
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
482
743
size_t suf_len = strlen(*suf);
483
744
if((d_name_len >= suf_len)
496
757
continue;
497
758
}
498
759
}
499
500
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
501
if (filename == NULL){
502
perror("malloc");
760
761
char *filename;
762
if(plugindir == NULL){
763
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
764
} else {
765
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
}
767
if(ret < 0){
768
perror("asprintf");
503
769
continue;
504
770
}
505
strcpy(filename, plugindir); /* Spurious warning */
506
strcat(filename, "/"); /* Spurious warning */
507
strcat(filename, dirst->d_name); /* Spurious warning */
508
771
509
772
ret = stat(filename, &st);
510
if (ret == -1){
773
if(ret == -1){
511
774
perror("stat");
512
775
free(filename);
513
776
continue;
514
777
}
515
516
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
778
779
/* Ignore non-executable files */
780
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
517
781
if(debug){
518
782
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
519
783
" with bad type or mode\n", filename);
521
785
free(filename);
522
786
continue;
523
787
}
524
if(getplugin(dirst->d_name, &plugin_list)->disabled){
788
789
plugin *p = getplugin(dirst->d_name);
790
if(p == NULL){
791
perror("getplugin");
792
free(filename);
793
continue;
794
}
795
if(p->disabled){
525
796
if(debug){
526
797
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
527
798
dirst->d_name);
529
800
free(filename);
530
801
continue;
531
802
}
532
plugin *p = getplugin(dirst->d_name, &plugin_list);
533
803
{
534
804
/* Add global arguments to argument list for this plugin */
535
plugin *g = getplugin(NULL, &plugin_list);
536
for(char **a = g->argv + 1; *a != NULL; a++){
537
addargument(p, *a);
538
}
539
}
540
int pipefd[2];
805
plugin *g = getplugin(NULL);
806
if(g != NULL){
807
for(char **a = g->argv + 1; *a != NULL; a++){
808
if(not add_argument(p, *a)){
809
perror("add_argument");
810
}
811
}
812
/* Add global environment variables */
813
for(char **e = g->environ; *e != NULL; e++){
814
if(not add_environment(p, *e, false)){
815
perror("add_environment");
816
}
817
}
818
}
819
}
820
/* If this plugin has any environment variables, we will call
821
using execve and need to duplicate the environment from this
822
process, too. */
823
if(p->environ[0] != NULL){
824
for(char **e = environ; *e != NULL; e++){
825
if(not add_environment(p, *e, false)){
826
perror("add_environment");
827
}
828
}
829
}
830
831
int pipefd[2];
541
832
ret = pipe(pipefd);
542
if (ret == -1){
833
if(ret == -1){
543
834
perror("pipe");
544
835
exitstatus = EXIT_FAILURE;
545
goto end;
836
goto fallback;
546
837
}
838
/* Ask OS to automatic close the pipe on exec */
547
839
ret = set_cloexec_flag(pipefd[0]);
548
840
if(ret < 0){
549
841
perror("set_cloexec_flag");
550
842
exitstatus = EXIT_FAILURE;
551
goto end;
843
goto fallback;
552
844
}
553
845
ret = set_cloexec_flag(pipefd[1]);
554
846
if(ret < 0){
555
847
perror("set_cloexec_flag");
556
848
exitstatus = EXIT_FAILURE;
557
goto end;
849
goto fallback;
558
850
}
559
851
/* Block SIGCHLD until process is safely in process list */
560
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
561
853
if(ret < 0){
562
854
perror("sigprocmask");
563
855
exitstatus = EXIT_FAILURE;
564
goto end;
856
goto fallback;
565
857
}
566
// Starting a new process to be watched
858
/* Starting a new process to be watched */
567
859
pid_t pid = fork();
568
860
if(pid == -1){
569
861
perror("fork");
570
862
exitstatus = EXIT_FAILURE;
571
goto end;
863
goto fallback;
572
864
}
573
865
if(pid == 0){
574
866
/* this is the child process */
577
869
perror("sigaction");
578
870
_exit(EXIT_FAILURE);
579
871
}
580
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
581
873
if(ret < 0){
582
874
perror("sigprocmask");
583
875
_exit(EXIT_FAILURE);
584
876
}
585
877
586
878
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
587
879
if(ret == -1){
588
880
perror("dup2");
594
886
above and must now close it manually here. */
595
887
closedir(dir);
596
888
}
597
if(execv(filename, p->argv) < 0){
598
perror("execv");
599
_exit(EXIT_FAILURE);
889
if(p->environ[0] == NULL){
890
if(execv(filename, p->argv) < 0){
891
perror("execv");
892
_exit(EXIT_FAILURE);
893
}
894
} else {
895
if(execve(filename, p->argv, p->environ) < 0){
896
perror("execve");
897
_exit(EXIT_FAILURE);
898
}
600
899
}
601
900
/* no return */
602
901
}
603
/* parent process */
902
/* Parent process */
903
close(pipefd[1]); /* Close unused write end of pipe */
604
904
free(filename);
605
close(pipefd[1]); /* close unused write end of pipe */
606
process *new_process = malloc(sizeof(process));
607
if (new_process == NULL){
608
perror("malloc");
609
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
905
plugin *new_plugin = getplugin(dirst->d_name);
906
if(new_plugin == NULL){
907
perror("getplugin");
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
610
909
if(ret < 0){
611
perror("sigprocmask");
910
perror("sigprocmask");
612
911
}
613
912
exitstatus = EXIT_FAILURE;
614
goto end;
913
goto fallback;
615
914
}
616
915
617
*new_process = (struct process){ .pid = pid,
618
.fd = pipefd[0],
619
.next = process_list };
620
// List handling
621
process_list = new_process;
916
new_plugin->pid = pid;
917
new_plugin->fd = pipefd[0];
918
622
919
/* Unblock SIGCHLD so signal handler can be run if this process
623
920
has already completed */
624
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
625
922
if(ret < 0){
626
923
perror("sigprocmask");
627
924
exitstatus = EXIT_FAILURE;
628
goto end;
629
}
630
631
FD_SET(new_process->fd, &rfds_all);
632
633
if (maxfd < new_process->fd){
634
maxfd = new_process->fd;
635
}
636
637
}
638
639
/* Free the plugin list */
640
for(plugin *next; plugin_list != NULL; plugin_list = next){
641
next = plugin_list->next;
642
free(plugin_list->argv);
643
free(plugin_list);
925
goto fallback;
926
}
927
928
FD_SET(new_plugin->fd, &rfds_all);
929
930
if(maxfd < new_plugin->fd){
931
maxfd = new_plugin->fd;
932
}
644
933
}
645
934
646
935
closedir(dir);
647
936
dir = NULL;
648
649
if (process_list == NULL){
650
fprintf(stderr, "No plugin processes started. Incorrect plugin"
651
" directory?\n");
652
process_list = NULL;
937
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
if(p->pid != 0){
940
break;
941
}
942
if(p->next == NULL){
943
fprintf(stderr, "No plugin processes started. Incorrect plugin"
944
" directory?\n");
945
free_plugin_list();
946
}
653
947
}
654
while(process_list){
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
655
951
fd_set rfds = rfds_all;
656
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
657
if (select_ret == -1){
953
if(select_ret == -1){
658
954
perror("select");
659
955
exitstatus = EXIT_FAILURE;
660
goto end;
956
goto fallback;
661
957
}
662
958
/* OK, now either a process completed, or something can be read
663
959
from one of them */
664
for(process *proc = process_list; proc ; proc = proc->next){
960
for(plugin *proc = plugin_list; proc != NULL;){
665
961
/* Is this process completely done? */
666
962
if(proc->eof and proc->completed){
667
963
/* Only accept the plugin output if it exited cleanly */
668
964
if(not WIFEXITED(proc->status)
669
965
or WEXITSTATUS(proc->status) != 0){
670
966
/* Bad exit by plugin */
967
671
968
if(debug){
672
969
if(WIFEXITED(proc->status)){
673
fprintf(stderr, "Plugin %u exited with status %d\n",
674
(unsigned int) (proc->pid),
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
675
972
WEXITSTATUS(proc->status));
676
973
} else if(WIFSIGNALED(proc->status)) {
677
fprintf(stderr, "Plugin %u killed by signal %d\n",
678
(unsigned int) (proc->pid),
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
679
976
WTERMSIG(proc->status));
680
977
} else if(WCOREDUMP(proc->status)){
681
fprintf(stderr, "Plugin %d dumped core\n",
682
(unsigned int) (proc->pid));
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
683
980
}
684
981
}
982
685
983
/* Remove the plugin */
686
984
FD_CLR(proc->fd, &rfds_all);
985
687
986
/* Block signal while modifying process_list */
688
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
689
988
if(ret < 0){
690
989
perror("sigprocmask");
691
990
exitstatus = EXIT_FAILURE;
692
goto end;
693
}
694
/* Delete this process entry from the list */
695
if(process_list == proc){
696
/* First one - simple */
697
process_list = proc->next;
698
} else {
699
/* Second one or later */
700
for(process *p = process_list; p != NULL; p = p->next){
701
if(p->next == proc){
702
p->next = proc->next;
703
break;
704
}
705
}
706
}
991
goto fallback;
992
}
993
994
plugin *next_plugin = proc->next;
995
free_plugin(proc);
996
proc = next_plugin;
997
707
998
/* We are done modifying process list, so unblock signal */
708
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
709
NULL);
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
710
1001
if(ret < 0){
711
1002
perror("sigprocmask");
712
}
713
free(proc->buffer);
714
free(proc);
715
/* We deleted this process from the list, so we can't go
716
proc->next. Therefore, start over from the beginning of
717
the process list */
718
break;
1003
exitstatus = EXIT_FAILURE;
1004
goto fallback;
1005
}
1006
1007
if(plugin_list == NULL){
1008
break;
1009
}
1010
1011
continue;
719
1012
}
1013
720
1014
/* This process exited nicely, so print its buffer */
721
722
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1015
1016
bool bret = print_out_password(proc->buffer,
1017
proc->buffer_length);
723
1018
if(not bret){
724
1019
perror("print_out_password");
725
1020
exitstatus = EXIT_FAILURE;
726
1021
}
727
goto end;
1022
goto fallback;
728
1023
}
1024
729
1025
/* This process has not completed. Does it have any output? */
730
1026
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
731
1027
/* This process had nothing to say at this time */
1028
proc = proc->next;
732
1029
continue;
733
1030
}
734
1031
/* Before reading, make the process' data buffer large enough */
735
1032
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
736
1033
proc->buffer = realloc(proc->buffer, proc->buffer_size
737
1034
+ (size_t) BUFFER_SIZE);
738
if (proc->buffer == NULL){
1035
if(proc->buffer == NULL){
739
1036
perror("malloc");
740
1037
exitstatus = EXIT_FAILURE;
741
goto end;
1038
goto fallback;
742
1039
}
743
1040
proc->buffer_size += BUFFER_SIZE;
744
1041
}
745
1042
/* Read from the process */
746
ret = read(proc->fd, proc->buffer + proc->buffer_length,
747
BUFFER_SIZE);
748
if(ret < 0){
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1045
if(sret < 0){
749
1046
/* Read error from this process; ignore the error */
1047
proc = proc->next;
750
1048
continue;
751
1049
}
752
if(ret == 0){
1050
if(sret == 0){
753
1051
/* got EOF */
754
1052
proc->eof = true;
755
1053
} else {
756
proc->buffer_length += (size_t) ret;
1054
proc->buffer_length += (size_t) sret;
757
1055
}
758
1056
}
759
1057
}
760
1058
761
1059
762
end:
1060
fallback:
763
1061
764
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
765
/* Fallback if all plugins failed, none are found or an error occured */
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1063
/* Fallback if all plugins failed, none are found or an error
1064
occured */
766
1065
bool bret;
767
1066
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
768
1067
char *passwordbuffer = getpass("Password: ");
769
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1068
size_t len = strlen(passwordbuffer);
1069
/* Strip trailing newline */
1070
if(len > 0 and passwordbuffer[len-1] == '\n'){
1071
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1072
len--;
1073
}
1074
bret = print_out_password(passwordbuffer, len);
770
1075
if(not bret){
771
1076
perror("print_out_password");
772
1077
exitstatus = EXIT_FAILURE;
773
goto end;
774
1078
}
775
1079
}
776
1080
777
1081
/* Restore old signal handler */
778
sigaction(SIGCHLD, &old_sigchld_action, NULL);
779
780
free(custom_argv);
781
782
/* Free the plugin list */
783
for(plugin *next; plugin_list != NULL; plugin_list = next){
784
next = plugin_list->next;
785
free(plugin_list->argv);
786
free(plugin_list);
1082
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1083
if(ret == -1){
1084
perror("sigaction");
1085
exitstatus = EXIT_FAILURE;
1086
}
1087
1088
if(custom_argv != NULL){
1089
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1090
free(*arg);
1091
}
1092
free(custom_argv);
787
1093
}
788
1094
789
1095
if(dir != NULL){
790
1096
closedir(dir);
791
1097
}
792
1098
793
/* Free the process list and kill the processes */
794
for(process *next; process_list != NULL; process_list = next){
795
next = process_list->next;
796
close(process_list->fd);
797
ret = kill(process_list->pid, SIGTERM);
798
if(ret == -1 and errno != ESRCH){
799
/* set-uid proccesses migth not get closed */
800
perror("kill");
1099
/* Kill the processes */
1100
for(plugin *p = plugin_list; p != NULL; p = p->next){
1101
if(p->pid != 0){
1102
close(p->fd);
1103
ret = kill(p->pid, SIGTERM);
1104
if(ret == -1 and errno != ESRCH){
1105
/* Set-uid proccesses might not get closed */
1106
perror("kill");
1107
}
801
1108
}
802
free(process_list->buffer);
803
free(process_list);
804
1109
}
805
1110
806
1111
/* Wait for any remaining child processes to terminate */
811
1116
perror("wait");
812
1117
}
813
1118
1119
free_plugin_list();
1120
1121
free(plugindir);
1122
free(argfile);
1123
814
1124
return exitstatus;
815
1125
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0