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- Committer: Teddy Hogeborn
- Date: 2009-01-18 00:18:50 UTC
- mto: (24.1.127 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 249.
- Revision ID: teddy@fukt.bsnet.se-20090118001850-pvg8xjwmbyt23fom
* debian/rules (install-indep): Removed "--no-start" from
dh_installinit.
dh_installinit.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- 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> /* strtok, 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
70
69
const char *argp_program_version = "mandos-client 1.0";
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;
70
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
76
72
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;
73
84
74
typedef struct process{
85
/* Variables used for running processes*/
75
86
pid_t pid;
76
87
int fd;
77
88
char *buffer;
78
89
size_t buffer_size;
79
90
size_t buffer_length;
80
91
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
bool disabled;
92
volatile bool completed;
93
volatile int status;
91
94
struct plugin *next;
92
95
} plugin;
93
96
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
if ((p->name == name)
97
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))){
98
106
return p;
99
107
}
100
108
}
101
109
/* Create a new plugin */
102
110
plugin *new_plugin = malloc(sizeof(plugin));
103
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
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
108
128
new_plugin->argv = malloc(sizeof(char *) * 2);
109
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
129
if(new_plugin->argv == NULL){
130
free(copy_name);
131
free(new_plugin);
132
return NULL;
112
133
}
113
new_plugin->argv[0] = name;
134
new_plugin->argv[0] = copy_name;
114
135
new_plugin->argv[1] = NULL;
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
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
118
146
/* Append the new plugin to the list */
119
*plugin_list = new_plugin;
147
plugin_list = new_plugin;
120
148
return new_plugin;
121
149
}
122
150
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
127
perror("malloc");
128
exit(EXIT_FAILURE);
129
}
130
p->argc++;
131
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));
132
205
}
133
206
134
207
/*
136
209
* Descriptor Flags".
137
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
138
211
*/
139
static int set_cloexec_flag(int fd)
140
{
212
static int set_cloexec_flag(int fd){
141
213
int ret = fcntl(fd, F_GETFD, 0);
142
214
/* If reading the flags failed, return error indication now. */
143
215
if(ret < 0){
147
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
148
220
}
149
221
150
process *process_list = NULL;
151
222
152
/* Mark a process as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
153
224
status. */
154
void handle_sigchld(__attribute__((unused)) int sig){
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
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
}
171
253
}
172
254
173
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){
174
257
ssize_t ret;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
178
258
for(size_t written = 0; written < length; written += (size_t)ret){
179
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
180
260
length - written));
185
265
return true;
186
266
}
187
267
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);
280
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
}
292
}
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
}
302
}
303
188
304
int main(int argc, char *argv[]){
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
305
char *plugindir = NULL;
306
char *argfile = NULL;
307
FILE *conffp;
190
308
size_t d_name_len;
191
309
DIR *dir = NULL;
192
310
struct dirent *dirst;
193
311
struct stat st;
194
312
fd_set rfds_all;
195
int ret, maxfd = 0;
313
int ret, numchars, maxfd = 0;
314
ssize_t sret;
315
intmax_t tmpmax;
196
316
uid_t uid = 65534;
197
317
gid_t gid = 65534;
198
318
bool debug = false;
200
320
struct sigaction old_sigchld_action;
201
321
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
202
322
.sa_flags = SA_NOCLDSTOP };
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
206
errno = 0;
323
char **custom_argv = NULL;
324
int custom_argc = 0;
207
325
208
326
/* Establish a signal handler */
209
327
sigemptyset(&sigchld_action.sa_mask);
210
328
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
211
if(ret < 0){
329
if(ret == -1){
212
330
perror("sigaddset");
213
exit(EXIT_FAILURE);
331
exitstatus = EXIT_FAILURE;
332
goto fallback;
214
333
}
215
334
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
216
if(ret < 0){
335
if(ret == -1){
217
336
perror("sigaction");
218
exit(EXIT_FAILURE);
337
exitstatus = EXIT_FAILURE;
338
goto fallback;
219
339
}
220
340
221
341
/* The options we understand. */
223
343
{ .name = "global-options", .key = 'g',
224
344
.arg = "OPTION[,OPTION[,...]]",
225
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" },
226
349
{ .name = "options-for", .key = 'o',
227
350
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
228
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" },
229
355
{ .name = "disable", .key = 'd',
230
356
.arg = "PLUGIN",
231
357
.doc = "Disable a specific plugin", .group = 1 },
358
{ .name = "enable", .key = 'e',
359
.arg = "PLUGIN",
360
.doc = "Enable a specific plugin", .group = 1 },
232
361
{ .name = "plugin-dir", .key = 128,
233
362
.arg = "DIRECTORY",
234
363
.doc = "Specify a different plugin directory", .group = 2 },
235
{ .name = "userid", .key = 129,
236
.arg = "ID", .flags = 0,
237
.doc = "User ID the plugins will run as", .group = 2 },
238
{ .name = "groupid", .key = 130,
239
.arg = "ID", .flags = 0,
240
.doc = "Group ID the plugins will run as", .group = 2 },
241
{ .name = "debug", .key = 131,
242
.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 },
243
375
{ .name = NULL }
244
376
};
245
377
246
error_t parse_opt (int key, char *arg, struct argp_state *state) {
247
/* Get the INPUT argument from `argp_parse', which we know is a
248
pointer to our plugin list pointer. */
249
plugin **plugins = state->input;
250
switch (key) {
251
case 'g':
252
if (arg != NULL){
253
char *p = strtok(arg, ",");
254
do{
255
addargument(getplugin(NULL, plugins), p);
256
p = strtok(NULL, ",");
257
} while (p != NULL);
258
}
259
break;
260
case 'o':
261
if (arg != NULL){
262
char *name = strtok(arg, ":");
263
char *p = strtok(NULL, ":");
264
if(p != NULL){
265
p = strtok(p, ",");
266
do{
267
addargument(getplugin(name, plugins), p);
268
p = strtok(NULL, ",");
269
} while (p != NULL);
270
}
271
}
272
break;
273
case 'd':
274
if (arg != NULL){
275
getplugin(arg, plugins)->disabled = true;
276
}
277
break;
278
case 128:
279
plugindir = arg;
280
break;
281
case 129:
282
uid = (uid_t)strtol(arg, NULL, 10);
283
break;
284
case 130:
285
gid = (gid_t)strtol(arg, NULL, 10);
286
break;
287
case 131:
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){
383
char *p;
384
while((p = strsep(&arg, ",")) != NULL){
385
if(p[0] == '\0'){
386
continue;
387
}
388
if(not add_argument(getplugin(NULL), p)){
389
perror("add_argument");
390
return ARGP_ERR_UNKNOWN;
391
}
392
}
393
}
394
break;
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){
407
break;
408
}
409
char *opt = strsep(&arg, ":");
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 */
288
489
debug = true;
289
490
break;
290
case ARGP_KEY_ARG:
291
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
292
argp_usage (state);
293
}
294
plus_options = arg;
295
break;
296
case ARGP_KEY_END:
297
break;
298
default:
299
return ARGP_ERR_UNKNOWN;
300
}
301
return 0;
302
}
303
304
plugin *plugin_list = NULL;
305
306
struct argp argp = { .options = options, .parser = parse_opt,
307
.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 = "",
308
547
.doc = "Mandos plugin runner -- Run plugins" };
309
548
310
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
311
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){
312
553
fprintf(stderr, "Unknown error while parsing arguments\n");
313
554
exitstatus = EXIT_FAILURE;
314
goto end;
555
goto fallback;
315
556
}
316
557
317
if(plus_options){
318
/* This is a mangled argument in the form of
319
"+--option+--other-option=parameter+--yet-another-option", etc */
320
/* Make new argc and argv vars, and call argp_parse() again. */
321
plus_options++; /* skip the first '+' character */
322
const char delims[] = "+";
323
char *arg;
324
int new_argc = 1;
325
plus_argv = malloc(sizeof(char*) * 2);
326
if(plus_argv == NULL){
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
}
567
if(conffp != NULL){
568
char *org_line = NULL;
569
char *p, *arg, *new_arg, *line;
570
size_t size = 0;
571
const char whitespace_delims[] = " \r\t\f\v\n";
572
const char comment_delim[] = "#";
573
574
custom_argc = 1;
575
custom_argv = malloc(sizeof(char*) * 2);
576
if(custom_argv == NULL){
327
577
perror("malloc");
328
578
exitstatus = EXIT_FAILURE;
329
goto end;
330
}
331
plus_argv[0] = argv[0];
332
plus_argv[1] = NULL;
333
arg = strtok(plus_options, delims); /* Get first argument */
334
while(arg != NULL){
335
new_argc++;
336
plus_argv = realloc(plus_argv, sizeof(char *)
337
* ((unsigned int) new_argc + 1));
338
if(plus_argv == NULL){
339
perror("realloc");
340
exitstatus = EXIT_FAILURE;
341
goto end;
342
}
343
plus_argv[new_argc-1] = arg;
344
plus_argv[new_argc] = NULL;
345
arg = strtok(NULL, delims); /* Get next argument */
346
}
347
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
348
if (ret == ARGP_ERR_UNKNOWN){
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 */
586
while(true){
587
sret = getline(&org_line, &size, conffp);
588
if(sret == -1){
589
break;
590
}
591
592
line = org_line;
593
arg = strsep(&line, comment_delim);
594
while((p = strsep(&arg, whitespace_delims)) != NULL){
595
if(p[0] == '\0'){
596
continue;
597
}
598
new_arg = strdup(p);
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;
617
}
618
}
619
free(org_line);
620
} else {
621
/* Check for harmful errors and go to fallback. Other errors might
622
not affect opening plugins */
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
624
perror("fopen");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
627
}
628
}
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
631
if(custom_argv != NULL){
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
0, NULL);
634
if(ret == ARGP_ERR_UNKNOWN){
349
635
fprintf(stderr, "Unknown error while parsing arguments\n");
350
636
exitstatus = EXIT_FAILURE;
351
goto end;
637
goto fallback;
352
638
}
353
639
}
354
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
355
650
if(debug){
356
651
for(plugin *p = plugin_list; p != NULL; p=p->next){
357
652
fprintf(stderr, "Plugin: %s has %d arguments\n",
359
654
for(char **a = p->argv; *a != NULL; a++){
360
655
fprintf(stderr, "\tArg: %s\n", *a);
361
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
}
362
661
}
363
662
}
364
663
664
/* Strip permissions down to nobody */
365
665
ret = setuid(uid);
366
if (ret == -1){
666
if(ret == -1){
367
667
perror("setuid");
368
}
369
668
}
370
669
setgid(gid);
371
if (ret == -1){
670
if(ret == -1){
372
671
perror("setgid");
373
672
}
374
673
375
dir = opendir(plugindir);
674
if(plugindir == NULL){
675
dir = opendir(PDIR);
676
} else {
677
dir = opendir(plugindir);
678
}
679
376
680
if(dir == NULL){
377
681
perror("Could not open plugin dir");
378
682
exitstatus = EXIT_FAILURE;
379
goto end;
683
goto fallback;
380
684
}
381
685
382
686
/* Set the FD_CLOEXEC flag on the directory, if possible */
387
691
if(ret < 0){
388
692
perror("set_cloexec_flag");
389
693
exitstatus = EXIT_FAILURE;
390
goto end;
694
goto fallback;
391
695
}
392
696
}
393
697
}
394
698
395
699
FD_ZERO(&rfds_all);
396
700
701
/* Read and execute any executable in the plugin directory*/
397
702
while(true){
398
703
dirst = readdir(dir);
399
704
400
// All directory entries have been processed
705
/* All directory entries have been processed */
401
706
if(dirst == NULL){
402
if (errno == EBADF){
707
if(errno == EBADF){
403
708
perror("readdir");
404
709
exitstatus = EXIT_FAILURE;
405
goto end;
710
goto fallback;
406
711
}
407
712
break;
408
713
}
409
714
410
715
d_name_len = strlen(dirst->d_name);
411
716
412
// Ignore dotfiles, backup files and other junk
717
/* Ignore dotfiles, backup files and other junk */
413
718
{
414
719
bool bad_name = false;
415
720
417
722
418
723
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
419
724
".dpkg-old",
725
".dpkg-bak",
420
726
".dpkg-divert", NULL };
421
727
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
422
728
size_t pre_len = strlen(*pre);
430
736
break;
431
737
}
432
738
}
433
434
739
if(bad_name){
435
740
continue;
436
741
}
437
438
742
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
439
743
size_t suf_len = strlen(*suf);
440
744
if((d_name_len >= suf_len)
453
757
continue;
454
758
}
455
759
}
456
457
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
458
if (filename == NULL){
459
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");
460
769
continue;
461
770
}
462
strcpy(filename, plugindir); /* Spurious warning */
463
strcat(filename, "/"); /* Spurious warning */
464
strcat(filename, dirst->d_name); /* Spurious warning */
465
771
466
772
ret = stat(filename, &st);
467
if (ret == -1){
773
if(ret == -1){
468
774
perror("stat");
469
775
free(filename);
470
776
continue;
471
777
}
472
473
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)){
474
781
if(debug){
475
782
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
476
783
" with bad type or mode\n", filename);
478
785
free(filename);
479
786
continue;
480
787
}
481
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){
482
796
if(debug){
483
797
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
484
798
dirst->d_name);
486
800
free(filename);
487
801
continue;
488
802
}
489
plugin *p = getplugin(dirst->d_name, &plugin_list);
490
803
{
491
804
/* Add global arguments to argument list for this plugin */
492
plugin *g = getplugin(NULL, &plugin_list);
493
for(char **a = g->argv + 1; *a != NULL; a++){
494
addargument(p, *a);
495
}
496
}
497
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];
498
832
ret = pipe(pipefd);
499
if (ret == -1){
833
if(ret == -1){
500
834
perror("pipe");
501
835
exitstatus = EXIT_FAILURE;
502
goto end;
836
goto fallback;
503
837
}
838
/* Ask OS to automatic close the pipe on exec */
504
839
ret = set_cloexec_flag(pipefd[0]);
505
840
if(ret < 0){
506
841
perror("set_cloexec_flag");
507
842
exitstatus = EXIT_FAILURE;
508
goto end;
843
goto fallback;
509
844
}
510
845
ret = set_cloexec_flag(pipefd[1]);
511
846
if(ret < 0){
512
847
perror("set_cloexec_flag");
513
848
exitstatus = EXIT_FAILURE;
514
goto end;
849
goto fallback;
515
850
}
516
851
/* Block SIGCHLD until process is safely in process list */
517
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
518
853
if(ret < 0){
519
854
perror("sigprocmask");
520
855
exitstatus = EXIT_FAILURE;
521
goto end;
856
goto fallback;
522
857
}
523
// Starting a new process to be watched
858
/* Starting a new process to be watched */
524
859
pid_t pid = fork();
525
860
if(pid == -1){
526
861
perror("fork");
527
862
exitstatus = EXIT_FAILURE;
528
goto end;
863
goto fallback;
529
864
}
530
865
if(pid == 0){
531
866
/* this is the child process */
534
869
perror("sigaction");
535
870
_exit(EXIT_FAILURE);
536
871
}
537
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
538
873
if(ret < 0){
539
874
perror("sigprocmask");
540
875
_exit(EXIT_FAILURE);
541
876
}
542
877
543
878
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
544
879
if(ret == -1){
545
880
perror("dup2");
551
886
above and must now close it manually here. */
552
887
closedir(dir);
553
888
}
554
if(execv(filename, p->argv) < 0){
555
perror("execv");
556
_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
}
557
899
}
558
900
/* no return */
559
901
}
560
/* parent process */
902
/* Parent process */
903
close(pipefd[1]); /* Close unused write end of pipe */
561
904
free(filename);
562
close(pipefd[1]); /* close unused write end of pipe */
563
process *new_process = malloc(sizeof(process));
564
if (new_process == NULL){
565
perror("malloc");
566
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);
567
909
if(ret < 0){
568
perror("sigprocmask");
910
perror("sigprocmask");
569
911
}
570
912
exitstatus = EXIT_FAILURE;
571
goto end;
913
goto fallback;
572
914
}
573
915
574
*new_process = (struct process){ .pid = pid,
575
.fd = pipefd[0],
576
.next = process_list };
577
// List handling
578
process_list = new_process;
916
new_plugin->pid = pid;
917
new_plugin->fd = pipefd[0];
918
579
919
/* Unblock SIGCHLD so signal handler can be run if this process
580
920
has already completed */
581
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
582
922
if(ret < 0){
583
923
perror("sigprocmask");
584
924
exitstatus = EXIT_FAILURE;
585
goto end;
586
}
587
588
FD_SET(new_process->fd, &rfds_all);
589
590
if (maxfd < new_process->fd){
591
maxfd = new_process->fd;
592
}
593
594
}
595
596
/* Free the plugin list */
597
for(plugin *next; plugin_list != NULL; plugin_list = next){
598
next = plugin_list->next;
599
free(plugin_list->argv);
600
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
}
601
933
}
602
934
603
935
closedir(dir);
604
936
dir = NULL;
605
606
if (process_list == NULL){
607
fprintf(stderr, "No plugin processes started. Incorrect plugin"
608
" directory?\n");
609
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
}
610
947
}
611
while(process_list){
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
612
951
fd_set rfds = rfds_all;
613
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
614
if (select_ret == -1){
953
if(select_ret == -1){
615
954
perror("select");
616
955
exitstatus = EXIT_FAILURE;
617
goto end;
956
goto fallback;
618
957
}
619
958
/* OK, now either a process completed, or something can be read
620
959
from one of them */
621
for(process *proc = process_list; proc ; proc = proc->next){
960
for(plugin *proc = plugin_list; proc != NULL;){
622
961
/* Is this process completely done? */
623
962
if(proc->eof and proc->completed){
624
963
/* Only accept the plugin output if it exited cleanly */
625
964
if(not WIFEXITED(proc->status)
626
965
or WEXITSTATUS(proc->status) != 0){
627
966
/* Bad exit by plugin */
967
628
968
if(debug){
629
969
if(WIFEXITED(proc->status)){
630
fprintf(stderr, "Plugin %u exited with status %d\n",
631
(unsigned int) (proc->pid),
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
632
972
WEXITSTATUS(proc->status));
633
973
} else if(WIFSIGNALED(proc->status)) {
634
fprintf(stderr, "Plugin %u killed by signal %d\n",
635
(unsigned int) (proc->pid),
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
636
976
WTERMSIG(proc->status));
637
977
} else if(WCOREDUMP(proc->status)){
638
fprintf(stderr, "Plugin %d dumped core\n",
639
(unsigned int) (proc->pid));
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
640
980
}
641
981
}
982
642
983
/* Remove the plugin */
643
984
FD_CLR(proc->fd, &rfds_all);
985
644
986
/* Block signal while modifying process_list */
645
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
646
988
if(ret < 0){
647
989
perror("sigprocmask");
648
990
exitstatus = EXIT_FAILURE;
649
goto end;
650
}
651
/* Delete this process entry from the list */
652
if(process_list == proc){
653
/* First one - simple */
654
process_list = proc->next;
655
} else {
656
/* Second one or later */
657
for(process *p = process_list; p != NULL; p = p->next){
658
if(p->next == proc){
659
p->next = proc->next;
660
break;
661
}
662
}
663
}
991
goto fallback;
992
}
993
994
plugin *next_plugin = proc->next;
995
free_plugin(proc);
996
proc = next_plugin;
997
664
998
/* We are done modifying process list, so unblock signal */
665
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
666
NULL);
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
667
1001
if(ret < 0){
668
1002
perror("sigprocmask");
669
}
670
free(proc->buffer);
671
free(proc);
672
/* We deleted this process from the list, so we can't go
673
proc->next. Therefore, start over from the beginning of
674
the process list */
675
break;
1003
exitstatus = EXIT_FAILURE;
1004
goto fallback;
1005
}
1006
1007
if(plugin_list == NULL){
1008
break;
1009
}
1010
1011
continue;
676
1012
}
1013
677
1014
/* This process exited nicely, so print its buffer */
678
679
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1015
1016
bool bret = print_out_password(proc->buffer,
1017
proc->buffer_length);
680
1018
if(not bret){
681
1019
perror("print_out_password");
682
1020
exitstatus = EXIT_FAILURE;
683
1021
}
684
goto end;
1022
goto fallback;
685
1023
}
1024
686
1025
/* This process has not completed. Does it have any output? */
687
1026
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
688
1027
/* This process had nothing to say at this time */
1028
proc = proc->next;
689
1029
continue;
690
1030
}
691
1031
/* Before reading, make the process' data buffer large enough */
692
1032
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
693
1033
proc->buffer = realloc(proc->buffer, proc->buffer_size
694
1034
+ (size_t) BUFFER_SIZE);
695
if (proc->buffer == NULL){
1035
if(proc->buffer == NULL){
696
1036
perror("malloc");
697
1037
exitstatus = EXIT_FAILURE;
698
goto end;
1038
goto fallback;
699
1039
}
700
1040
proc->buffer_size += BUFFER_SIZE;
701
1041
}
702
1042
/* Read from the process */
703
ret = read(proc->fd, proc->buffer + proc->buffer_length,
704
BUFFER_SIZE);
705
if(ret < 0){
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1045
if(sret < 0){
706
1046
/* Read error from this process; ignore the error */
1047
proc = proc->next;
707
1048
continue;
708
1049
}
709
if(ret == 0){
1050
if(sret == 0){
710
1051
/* got EOF */
711
1052
proc->eof = true;
712
1053
} else {
713
proc->buffer_length += (size_t) ret;
1054
proc->buffer_length += (size_t) sret;
714
1055
}
715
1056
}
716
1057
}
717
1058
718
1059
719
end:
1060
fallback:
720
1061
721
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
722
/* 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 */
723
1065
bool bret;
724
1066
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
725
1067
char *passwordbuffer = getpass("Password: ");
726
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);
727
1075
if(not bret){
728
1076
perror("print_out_password");
729
1077
exitstatus = EXIT_FAILURE;
730
goto end;
731
1078
}
732
1079
}
733
1080
734
1081
/* Restore old signal handler */
735
sigaction(SIGCHLD, &old_sigchld_action, NULL);
736
737
free(plus_argv);
738
739
/* Free the plugin list */
740
for(plugin *next; plugin_list != NULL; plugin_list = next){
741
next = plugin_list->next;
742
free(plugin_list->argv);
743
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);
744
1093
}
745
1094
746
1095
if(dir != NULL){
747
1096
closedir(dir);
748
1097
}
749
1098
750
/* Free the process list and kill the processes */
751
for(process *next; process_list != NULL; process_list = next){
752
next = process_list->next;
753
close(process_list->fd);
754
ret = kill(process_list->pid, SIGTERM);
755
if(ret == -1 and errno != ESRCH){
756
/* set-uid proccesses migth not get closed */
757
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
}
758
1108
}
759
free(process_list->buffer);
760
free(process_list);
761
1109
}
762
1110
763
1111
/* Wait for any remaining child processes to terminate */
768
1116
perror("wait");
769
1117
}
770
1118
1119
free_plugin_list();
1120
1121
free(plugindir);
1122
free(argfile);
1123
771
1124
return exitstatus;
772
1125
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0