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- Committer: Teddy Hogeborn
- Date: 2009-05-17 00:50:09 UTC
- mto: (24.1.170 mandos) (237.4.29 release)
- mto: This revision was merged to the branch mainline in revision 343.
- Revision ID: teddy@fukt.bsnet.se-20090517005009-c0iptxampo6nf177
* initramfs-tools-hook-conf: Security bug fix: Add code to handle
being called by "mkinitramfs-kpkg"
instead of "update-initramfs".
being called by "mkinitramfs-kpkg"
instead of "update-initramfs".
- 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
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,
56
57
#include <argp.h> /* struct argp_option, struct
57
58
argp_state, struct argp,
58
59
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
60
62
#include <signal.h> /* struct sigaction, sigemptyset(),
61
63
sigaddset(), sigaction(),
62
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
63
SIG_UNBLOCK, kill() */
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
64
67
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
65
69
66
70
#define BUFFER_SIZE 256
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
71
72
#define PDIR "/lib/mandos/plugins.d"
73
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
75
const char *argp_program_version = "plugin-runner " VERSION;
70
76
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
77
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
86
78
typedef struct plugin{
87
79
char *name; /* can be NULL or any plugin name */
88
80
char **argv;
90
82
char **environ;
91
83
int envc;
92
84
bool disabled;
85
86
/* Variables used for running processes*/
87
pid_t pid;
88
int fd;
89
char *buffer;
90
size_t buffer_size;
91
size_t buffer_length;
92
bool eof;
93
volatile sig_atomic_t completed;
94
int status;
93
95
struct plugin *next;
94
96
} plugin;
95
97
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))){
98
static plugin *plugin_list = NULL;
99
100
/* Gets an existing plugin based on name,
101
or if none is found, creates a new one */
102
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
if((p->name == name)
106
or (p->name and name and (strcmp(p->name, name) == 0))){
100
107
return p;
101
108
}
102
109
}
103
110
/* Create a new plugin */
104
111
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
112
if(new_plugin == NULL){
106
113
return NULL;
107
114
}
108
char *copy_name = strdup(name);
109
if(copy_name == NULL){
110
return NULL;
115
char *copy_name = NULL;
116
if(name != NULL){
117
copy_name = strdup(name);
118
if(copy_name == NULL){
119
free(new_plugin);
120
return NULL;
121
}
111
122
}
112
123
113
*new_plugin = (plugin) { .name = copy_name,
114
.argc = 1,
115
.envc = 0,
116
.disabled = false,
117
.next = *plugin_list };
124
*new_plugin = (plugin){ .name = copy_name,
125
.argc = 1,
126
.disabled = false,
127
.next = plugin_list };
118
128
119
129
new_plugin->argv = malloc(sizeof(char *) * 2);
120
if (new_plugin->argv == NULL){
130
if(new_plugin->argv == NULL){
131
free(copy_name);
121
132
free(new_plugin);
122
133
return NULL;
123
134
}
124
135
new_plugin->argv[0] = copy_name;
125
136
new_plugin->argv[1] = NULL;
126
137
127
138
new_plugin->environ = malloc(sizeof(char *));
128
139
if(new_plugin->environ == NULL){
140
free(copy_name);
129
141
free(new_plugin->argv);
130
142
free(new_plugin);
131
143
return NULL;
132
144
}
133
145
new_plugin->environ[0] = NULL;
146
134
147
/* Append the new plugin to the list */
135
*plugin_list = new_plugin;
148
plugin_list = new_plugin;
136
149
return new_plugin;
137
150
}
138
151
168
181
}
169
182
170
183
/* Add to a plugin's environment */
171
static bool add_environment(plugin *p, const char *def){
184
static bool add_environment(plugin *p, const char *def, bool replace){
172
185
if(p == NULL){
173
186
return false;
174
187
}
188
/* namelen = length of name of environment variable */
189
size_t namelen = (size_t)(strchrnul(def, '=') - def);
190
/* Search for this environment variable */
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
193
/* It already exists */
194
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
196
if(new == NULL){
197
return false;
198
}
199
*e = new;
200
strcpy(*e, def);
201
}
202
return true;
203
}
204
}
175
205
return add_to_char_array(def, &(p->environ), &(p->envc));
176
206
}
177
207
178
179
208
/*
180
209
* Based on the example in the GNU LibC manual chapter 13.13 "File
181
210
* Descriptor Flags".
182
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
183
212
*/
184
static int set_cloexec_flag(int fd)
185
{
213
static int set_cloexec_flag(int fd){
186
214
int ret = fcntl(fd, F_GETFD, 0);
187
215
/* If reading the flags failed, return error indication now. */
188
216
if(ret < 0){
192
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
193
221
}
194
222
195
process *process_list = NULL;
196
223
197
/* Mark a process as completed when it exits, and save its exit
224
/* Mark processes as completed when they exit, and save their exit
198
225
status. */
199
void handle_sigchld(__attribute__((unused)) int sig){
200
process *proc = process_list;
201
int status;
202
pid_t pid = wait(&status);
203
if(pid == -1){
204
perror("wait");
205
return;
206
}
207
while(proc != NULL and proc->pid != pid){
208
proc = proc->next;
209
}
210
if(proc == NULL){
211
/* Process not found in process list */
212
return;
213
}
214
proc->status = status;
215
proc->completed = true;
226
static void handle_sigchld(__attribute__((unused)) int sig){
227
int old_errno = errno;
228
while(true){
229
plugin *proc = plugin_list;
230
int status;
231
pid_t pid = waitpid(-1, &status, WNOHANG);
232
if(pid == 0){
233
/* Only still running child processes */
234
break;
235
}
236
if(pid == -1){
237
if(errno == ECHILD){
238
/* No child processes */
239
break;
240
}
241
perror("waitpid");
242
}
243
244
/* A child exited, find it in process_list */
245
while(proc != NULL and proc->pid != pid){
246
proc = proc->next;
247
}
248
if(proc == NULL){
249
/* Process not found in process list */
250
continue;
251
}
252
proc->status = status;
253
proc->completed = 1;
254
}
255
errno = old_errno;
216
256
}
217
257
218
bool print_out_password(const char *buffer, size_t length){
258
/* Prints out a password to stdout */
259
static bool print_out_password(const char *buffer, size_t length){
219
260
ssize_t ret;
220
if(length>0 and buffer[length-1] == '\n'){
221
length--;
222
}
223
261
for(size_t written = 0; written < length; written += (size_t)ret){
224
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
225
263
length - written));
230
268
return true;
231
269
}
232
270
233
char **add_to_argv(char **argv, int *argc, char *arg){
234
if (argv == NULL){
235
*argc = 1;
236
argv = malloc(sizeof(char*) * 2);
237
if(argv == NULL){
238
return NULL;
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
239
295
}
240
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
241
argv[1] = NULL;
242
}
243
*argc += 1;
244
argv = realloc(argv, sizeof(char *)
245
* ((unsigned int) *argc + 1));
246
if(argv == NULL){
247
return NULL;
248
}
249
argv[*argc-1] = arg;
250
argv[*argc] = NULL;
251
return argv;
296
}
297
298
free(plugin_node);
252
299
}
253
300
254
static void free_plugin_list(plugin *plugin_list){
255
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
256
next = plugin_list->next;
257
free(plugin_list->name);
258
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
259
free(*arg);
260
}
261
free(plugin_list->argv);
262
for(char **env = plugin_list->environ; *env != NULL; env++){
263
free(*env);
264
}
265
free(plugin_list->environ);
266
free(plugin_list);
267
}
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
268
305
}
269
306
270
307
int main(int argc, char *argv[]){
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
308
char *plugindir = NULL;
309
char *argfile = NULL;
273
310
FILE *conffp;
274
311
size_t d_name_len;
275
312
DIR *dir = NULL;
277
314
struct stat st;
278
315
fd_set rfds_all;
279
316
int ret, maxfd = 0;
317
ssize_t sret;
318
intmax_t tmpmax;
280
319
uid_t uid = 65534;
281
320
gid_t gid = 65534;
282
321
bool debug = false;
298
337
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
299
338
if(ret == -1){
300
339
perror("sigaction");
301
exitstatus = EXIT_FAILURE;
340
exitstatus = EXIT_FAILURE;
302
341
goto fallback;
303
342
}
304
343
307
346
{ .name = "global-options", .key = 'g',
308
347
.arg = "OPTION[,OPTION[,...]]",
309
348
.doc = "Options passed to all plugins" },
310
{ .name = "global-envs", .key = 'e',
349
{ .name = "global-env", .key = 'G',
311
350
.arg = "VAR=value",
312
351
.doc = "Environment variable passed to all plugins" },
313
352
{ .name = "options-for", .key = 'o',
314
353
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
315
354
.doc = "Options passed only to specified plugin" },
316
{ .name = "envs-for", .key = 'f',
355
{ .name = "env-for", .key = 'E',
317
356
.arg = "PLUGIN:ENV=value",
318
357
.doc = "Environment variable passed to specified plugin" },
319
358
{ .name = "disable", .key = 'd',
320
359
.arg = "PLUGIN",
321
360
.doc = "Disable a specific plugin", .group = 1 },
361
{ .name = "enable", .key = 'e',
362
.arg = "PLUGIN",
363
.doc = "Enable a specific plugin", .group = 1 },
322
364
{ .name = "plugin-dir", .key = 128,
323
365
.arg = "DIRECTORY",
324
366
.doc = "Specify a different plugin directory", .group = 2 },
325
{ .name = "userid", .key = 129,
326
.arg = "ID", .flags = 0,
327
.doc = "User ID the plugins will run as", .group = 2 },
328
{ .name = "groupid", .key = 130,
329
.arg = "ID", .flags = 0,
330
.doc = "Group ID the plugins will run as", .group = 2 },
331
{ .name = "debug", .key = 131,
332
.doc = "Debug mode", .group = 3 },
367
{ .name = "config-file", .key = 129,
368
.arg = "FILE",
369
.doc = "Specify a different configuration file", .group = 2 },
370
{ .name = "userid", .key = 130,
371
.arg = "ID", .flags = 0,
372
.doc = "User ID the plugins will run as", .group = 3 },
373
{ .name = "groupid", .key = 131,
374
.arg = "ID", .flags = 0,
375
.doc = "Group ID the plugins will run as", .group = 3 },
376
{ .name = "debug", .key = 132,
377
.doc = "Debug mode", .group = 4 },
333
378
{ .name = NULL }
334
379
};
335
380
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
340
switch (key) {
341
case 'g':
342
if (arg != NULL){
343
char *p;
344
while((p = strsep(&arg, ",")) != NULL){
345
if(p[0] == '\0'){
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
383
char *tmp;
384
switch(key){
385
case 'g': /* --global-options */
386
if(arg != NULL){
387
char *plugin_option;
388
while((plugin_option = strsep(&arg, ",")) != NULL){
389
if(plugin_option[0] == '\0'){
346
390
continue;
347
391
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
392
if(not add_argument(getplugin(NULL), plugin_option)){
349
393
perror("add_argument");
350
394
return ARGP_ERR_UNKNOWN;
351
395
}
352
396
}
353
397
}
354
398
break;
355
case 'e':
399
case 'G': /* --global-env */
356
400
if(arg == NULL){
357
401
break;
358
402
}
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
403
if(not add_environment(getplugin(NULL), arg, true)){
404
perror("add_environment");
367
405
}
368
406
break;
369
case 'o':
370
if (arg != NULL){
371
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
373
break;
374
}
375
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
377
break;
378
}
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
407
case 'o': /* --options-for */
408
if(arg != NULL){
409
char *plugin_name = strsep(&arg, ":");
410
if(plugin_name[0] == '\0'){
411
break;
412
}
413
char *plugin_option;
414
while((plugin_option = strsep(&arg, ",")) != NULL){
415
if(not add_argument(getplugin(plugin_name), plugin_option)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
389
418
}
390
419
}
391
420
}
392
421
break;
393
case 'f':
422
case 'E': /* --env-for */
394
423
if(arg == NULL){
395
424
break;
396
425
}
399
428
if(envdef == NULL){
400
429
break;
401
430
}
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
406
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
431
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
408
433
perror("add_environment");
409
434
}
410
435
}
411
436
break;
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
437
case 'd': /* --disable */
438
if(arg != NULL){
439
plugin *p = getplugin(arg);
415
440
if(p == NULL){
416
441
return ARGP_ERR_UNKNOWN;
417
442
}
418
443
p->disabled = true;
419
444
}
420
445
break;
421
case 128:
422
plugindir = arg;
423
break;
424
case 129:
425
uid = (uid_t)strtol(arg, NULL, 10);
426
break;
427
case 130:
428
gid = (gid_t)strtol(arg, NULL, 10);
429
break;
430
case 131:
446
case 'e': /* --enable */
447
if(arg != NULL){
448
plugin *p = getplugin(arg);
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
451
}
452
p->disabled = false;
453
}
454
break;
455
case 128: /* --plugin-dir */
456
free(plugindir);
457
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
461
break;
462
case 129: /* --config-file */
463
/* This is already done by parse_opt_config_file() */
464
break;
465
case 130: /* --userid */
466
errno = 0;
467
tmpmax = strtoimax(arg, &tmp, 10);
468
if(errno != 0 or tmp == arg or *tmp != '\0'
469
or tmpmax != (uid_t)tmpmax){
470
fprintf(stderr, "Bad user ID number: \"%s\", using %"
471
PRIdMAX "\n", arg, (intmax_t)uid);
472
} else {
473
uid = (uid_t)tmpmax;
474
}
475
break;
476
case 131: /* --groupid */
477
errno = 0;
478
tmpmax = strtoimax(arg, &tmp, 10);
479
if(errno != 0 or tmp == arg or *tmp != '\0'
480
or tmpmax != (gid_t)tmpmax){
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 */
431
488
debug = true;
432
489
break;
433
case ARGP_KEY_ARG:
434
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
435
break;
436
case ARGP_KEY_END:
437
break;
438
default:
439
return ARGP_ERR_UNKNOWN;
440
}
441
return 0;
442
}
443
444
plugin *plugin_list = NULL;
445
446
struct argp argp = { .options = options, .parser = parse_opt,
447
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
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 = "",
448
546
.doc = "Mandos plugin runner -- Run plugins" };
449
547
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
451
if (ret == ARGP_ERR_UNKNOWN){
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){
452
552
fprintf(stderr, "Unknown error while parsing arguments\n");
453
553
exitstatus = EXIT_FAILURE;
454
554
goto fallback;
455
555
}
456
457
conffp = fopen(argfile, "r");
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
}
458
566
if(conffp != NULL){
459
567
char *org_line = NULL;
460
568
char *p, *arg, *new_arg, *line;
461
569
size_t size = 0;
462
ssize_t sret;
463
570
const char whitespace_delims[] = " \r\t\f\v\n";
464
571
const char comment_delim[] = "#";
465
572
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 */
466
585
while(true){
467
586
sret = getline(&org_line, &size, conffp);
468
587
if(sret == -1){
469
588
break;
470
589
}
471
590
472
591
line = org_line;
473
592
arg = strsep(&line, comment_delim);
474
593
while((p = strsep(&arg, whitespace_delims)) != NULL){
476
595
continue;
477
596
}
478
597
new_arg = strdup(p);
479
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
480
if (custom_argv == NULL){
481
perror("add_to_argv");
482
exitstatus = EXIT_FAILURE;
483
goto fallback;
484
}
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;
485
616
}
486
617
}
487
618
free(org_line);
488
} else{
619
} else {
489
620
/* Check for harmful errors and go to fallback. Other errors might
490
621
not affect opening plugins */
491
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
492
623
perror("fopen");
493
624
exitstatus = EXIT_FAILURE;
494
625
goto fallback;
495
626
}
496
627
}
497
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
498
630
if(custom_argv != NULL){
499
custom_argv[0] = argv[0];
500
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
501
if (ret == ARGP_ERR_UNKNOWN){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
502
634
fprintf(stderr, "Unknown error while parsing arguments\n");
503
635
exitstatus = EXIT_FAILURE;
504
636
goto fallback;
505
637
}
506
638
}
507
639
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
508
649
if(debug){
509
650
for(plugin *p = plugin_list; p != NULL; p=p->next){
510
651
fprintf(stderr, "Plugin: %s has %d arguments\n",
512
653
for(char **a = p->argv; *a != NULL; a++){
513
654
fprintf(stderr, "\tArg: %s\n", *a);
514
655
}
515
fprintf(stderr, "...and %u environment variables\n", p->envc);
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
516
657
for(char **a = p->environ; *a != NULL; a++){
517
658
fprintf(stderr, "\t%s\n", *a);
518
659
}
519
660
}
520
661
}
521
662
663
/* Strip permissions down to nobody */
664
setgid(gid);
665
if(ret == -1){
666
perror("setgid");
667
}
522
668
ret = setuid(uid);
523
if (ret == -1){
669
if(ret == -1){
524
670
perror("setuid");
525
671
}
526
672
527
setgid(gid);
528
if (ret == -1){
529
perror("setgid");
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
530
677
}
531
678
532
dir = opendir(plugindir);
533
679
if(dir == NULL){
534
680
perror("Could not open plugin dir");
535
681
exitstatus = EXIT_FAILURE;
551
697
552
698
FD_ZERO(&rfds_all);
553
699
700
/* Read and execute any executable in the plugin directory*/
554
701
while(true){
555
702
dirst = readdir(dir);
556
703
557
// All directory entries have been processed
704
/* All directory entries have been processed */
558
705
if(dirst == NULL){
559
if (errno == EBADF){
706
if(errno == EBADF){
560
707
perror("readdir");
561
708
exitstatus = EXIT_FAILURE;
562
709
goto fallback;
566
713
567
714
d_name_len = strlen(dirst->d_name);
568
715
569
// Ignore dotfiles, backup files and other junk
716
/* Ignore dotfiles, backup files and other junk */
570
717
{
571
718
bool bad_name = false;
572
719
574
721
575
722
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
576
723
".dpkg-old",
724
".dpkg-bak",
577
725
".dpkg-divert", NULL };
578
726
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
579
727
size_t pre_len = strlen(*pre);
587
735
break;
588
736
}
589
737
}
590
591
738
if(bad_name){
592
739
continue;
593
740
}
594
595
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
596
742
size_t suf_len = strlen(*suf);
597
743
if((d_name_len >= suf_len)
610
756
continue;
611
757
}
612
758
}
613
759
614
760
char *filename;
615
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
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
}
616
766
if(ret < 0){
617
767
perror("asprintf");
618
768
continue;
619
769
}
620
770
621
771
ret = stat(filename, &st);
622
if (ret == -1){
772
if(ret == -1){
623
773
perror("stat");
624
774
free(filename);
625
775
continue;
626
776
}
627
777
628
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
778
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
629
780
if(debug){
630
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
631
782
" with bad type or mode\n", filename);
633
784
free(filename);
634
785
continue;
635
786
}
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
787
788
plugin *p = getplugin(dirst->d_name);
637
789
if(p == NULL){
638
790
perror("getplugin");
639
791
free(filename);
649
801
}
650
802
{
651
803
/* Add global arguments to argument list for this plugin */
652
plugin *g = getplugin(NULL, &plugin_list);
804
plugin *g = getplugin(NULL);
653
805
if(g != NULL){
654
806
for(char **a = g->argv + 1; *a != NULL; a++){
655
807
if(not add_argument(p, *a)){
658
810
}
659
811
/* Add global environment variables */
660
812
for(char **e = g->environ; *e != NULL; e++){
661
if(not add_environment(p, *e)){
813
if(not add_environment(p, *e, false)){
662
814
perror("add_environment");
663
815
}
664
816
}
669
821
process, too. */
670
822
if(p->environ[0] != NULL){
671
823
for(char **e = environ; *e != NULL; e++){
672
char *copy = strdup(*e);
673
if(copy == NULL){
674
perror("strdup");
675
continue;
676
}
677
if(not add_environment(p, copy)){
824
if(not add_environment(p, *e, false)){
678
825
perror("add_environment");
679
826
}
680
827
}
681
828
}
682
829
683
int pipefd[2];
830
int pipefd[2];
684
831
ret = pipe(pipefd);
685
if (ret == -1){
832
if(ret == -1){
686
833
perror("pipe");
687
834
exitstatus = EXIT_FAILURE;
688
835
goto fallback;
689
836
}
837
/* Ask OS to automatic close the pipe on exec */
690
838
ret = set_cloexec_flag(pipefd[0]);
691
839
if(ret < 0){
692
840
perror("set_cloexec_flag");
700
848
goto fallback;
701
849
}
702
850
/* Block SIGCHLD until process is safely in process list */
703
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
704
852
if(ret < 0){
705
853
perror("sigprocmask");
706
854
exitstatus = EXIT_FAILURE;
707
855
goto fallback;
708
856
}
709
// Starting a new process to be watched
857
/* Starting a new process to be watched */
710
858
pid_t pid = fork();
711
859
if(pid == -1){
712
860
perror("fork");
720
868
perror("sigaction");
721
869
_exit(EXIT_FAILURE);
722
870
}
723
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
724
872
if(ret < 0){
725
873
perror("sigprocmask");
726
874
_exit(EXIT_FAILURE);
727
875
}
728
876
729
877
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
730
878
if(ret == -1){
731
879
perror("dup2");
750
898
}
751
899
/* no return */
752
900
}
753
/* parent process */
901
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
754
903
free(filename);
755
close(pipefd[1]); /* close unused write end of pipe */
756
process *new_process = malloc(sizeof(process));
757
if (new_process == NULL){
758
perror("malloc");
759
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
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);
760
908
if(ret < 0){
761
perror("sigprocmask");
909
perror("sigprocmask");
762
910
}
763
911
exitstatus = EXIT_FAILURE;
764
912
goto fallback;
765
913
}
766
914
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
process_list = new_process;
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
917
772
918
/* Unblock SIGCHLD so signal handler can be run if this process
773
919
has already completed */
774
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
775
921
if(ret < 0){
776
922
perror("sigprocmask");
777
923
exitstatus = EXIT_FAILURE;
778
924
goto fallback;
779
925
}
780
926
781
FD_SET(new_process->fd, &rfds_all);
927
FD_SET(new_plugin->fd, &rfds_all);
782
928
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
929
if(maxfd < new_plugin->fd){
930
maxfd = new_plugin->fd;
785
931
}
786
787
932
}
788
933
789
free_plugin_list(plugin_list);
790
791
934
closedir(dir);
792
935
dir = NULL;
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
process_list = NULL;
936
free_plugin(getplugin(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
}
798
947
}
799
while(process_list){
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
800
951
fd_set rfds = rfds_all;
801
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
802
if (select_ret == -1){
953
if(select_ret == -1){
803
954
perror("select");
804
955
exitstatus = EXIT_FAILURE;
805
956
goto fallback;
806
957
}
807
958
/* OK, now either a process completed, or something can be read
808
959
from one of them */
809
for(process *proc = process_list; proc ; proc = proc->next){
960
for(plugin *proc = plugin_list; proc != NULL;){
810
961
/* Is this process completely done? */
811
if(proc->eof and proc->completed){
962
if(proc->completed and proc->eof){
812
963
/* Only accept the plugin output if it exited cleanly */
813
964
if(not WIFEXITED(proc->status)
814
965
or WEXITSTATUS(proc->status) != 0){
815
966
/* Bad exit by plugin */
967
816
968
if(debug){
817
969
if(WIFEXITED(proc->status)){
818
fprintf(stderr, "Plugin %u exited with status %d\n",
819
(unsigned int) (proc->pid),
970
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
971
" status %d\n", proc->name,
972
(intmax_t) (proc->pid),
820
973
WEXITSTATUS(proc->status));
821
} else if(WIFSIGNALED(proc->status)) {
822
fprintf(stderr, "Plugin %u killed by signal %d\n",
823
(unsigned int) (proc->pid),
974
} else if(WIFSIGNALED(proc->status)){
975
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
976
" signal %d\n", proc->name,
977
(intmax_t) (proc->pid),
824
978
WTERMSIG(proc->status));
825
979
} else if(WCOREDUMP(proc->status)){
826
fprintf(stderr, "Plugin %d dumped core\n",
827
(unsigned int) (proc->pid));
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
981
" core\n", proc->name, (intmax_t) (proc->pid));
828
982
}
829
983
}
984
830
985
/* Remove the plugin */
831
986
FD_CLR(proc->fd, &rfds_all);
987
832
988
/* Block signal while modifying process_list */
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
834
990
if(ret < 0){
835
991
perror("sigprocmask");
836
992
exitstatus = EXIT_FAILURE;
837
993
goto fallback;
838
994
}
839
/* Delete this process entry from the list */
840
if(process_list == proc){
841
/* First one - simple */
842
process_list = proc->next;
843
} else {
844
/* Second one or later */
845
for(process *p = process_list; p != NULL; p = p->next){
846
if(p->next == proc){
847
p->next = proc->next;
848
break;
849
}
850
}
851
}
995
996
plugin *next_plugin = proc->next;
997
free_plugin(proc);
998
proc = next_plugin;
999
852
1000
/* We are done modifying process list, so unblock signal */
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
854
NULL);
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
855
1003
if(ret < 0){
856
1004
perror("sigprocmask");
857
}
858
free(proc->buffer);
859
free(proc);
860
/* We deleted this process from the list, so we can't go
861
proc->next. Therefore, start over from the beginning of
862
the process list */
863
break;
1005
exitstatus = EXIT_FAILURE;
1006
goto fallback;
1007
}
1008
1009
if(plugin_list == NULL){
1010
break;
1011
}
1012
1013
continue;
864
1014
}
1015
865
1016
/* This process exited nicely, so print its buffer */
866
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1017
1018
bool bret = print_out_password(proc->buffer,
1019
proc->buffer_length);
868
1020
if(not bret){
869
1021
perror("print_out_password");
870
1022
exitstatus = EXIT_FAILURE;
871
1023
}
872
1024
goto fallback;
873
1025
}
1026
874
1027
/* This process has not completed. Does it have any output? */
875
1028
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
876
1029
/* This process had nothing to say at this time */
1030
proc = proc->next;
877
1031
continue;
878
1032
}
879
1033
/* Before reading, make the process' data buffer large enough */
880
1034
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
881
1035
proc->buffer = realloc(proc->buffer, proc->buffer_size
882
1036
+ (size_t) BUFFER_SIZE);
883
if (proc->buffer == NULL){
1037
if(proc->buffer == NULL){
884
1038
perror("malloc");
885
1039
exitstatus = EXIT_FAILURE;
886
1040
goto fallback;
888
1042
proc->buffer_size += BUFFER_SIZE;
889
1043
}
890
1044
/* Read from the process */
891
ret = read(proc->fd, proc->buffer + proc->buffer_length,
892
BUFFER_SIZE);
893
if(ret < 0){
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1047
if(sret < 0){
894
1048
/* Read error from this process; ignore the error */
1049
proc = proc->next;
895
1050
continue;
896
1051
}
897
if(ret == 0){
1052
if(sret == 0){
898
1053
/* got EOF */
899
1054
proc->eof = true;
900
1055
} else {
901
proc->buffer_length += (size_t) ret;
1056
proc->buffer_length += (size_t) sret;
902
1057
}
903
1058
}
904
1059
}
905
906
1060
1061
907
1062
fallback:
908
1063
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1065
/* Fallback if all plugins failed, none are found or an error
1066
occured */
911
1067
bool bret;
912
1068
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
913
1069
char *passwordbuffer = getpass("Password: ");
914
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1070
size_t len = strlen(passwordbuffer);
1071
/* Strip trailing newline */
1072
if(len > 0 and passwordbuffer[len-1] == '\n'){
1073
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1074
len--;
1075
}
1076
bret = print_out_password(passwordbuffer, len);
915
1077
if(not bret){
916
1078
perror("print_out_password");
917
1079
exitstatus = EXIT_FAILURE;
924
1086
perror("sigaction");
925
1087
exitstatus = EXIT_FAILURE;
926
1088
}
927
1089
928
1090
if(custom_argv != NULL){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1091
for(char **arg = custom_argv+1; *arg != NULL; arg++){
930
1092
free(*arg);
931
1093
}
932
1094
free(custom_argv);
933
1095
}
934
free_plugin_list(plugin_list);
935
1096
936
1097
if(dir != NULL){
937
1098
closedir(dir);
938
1099
}
939
1100
940
/* Free the process list and kill the processes */
941
for(process *next; process_list != NULL; process_list = next){
942
next = process_list->next;
943
close(process_list->fd);
944
ret = kill(process_list->pid, SIGTERM);
945
if(ret == -1 and errno != ESRCH){
946
/* set-uid proccesses migth not get closed */
947
perror("kill");
1101
/* Kill the processes */
1102
for(plugin *p = plugin_list; p != NULL; p = p->next){
1103
if(p->pid != 0){
1104
close(p->fd);
1105
ret = kill(p->pid, SIGTERM);
1106
if(ret == -1 and errno != ESRCH){
1107
/* Set-uid proccesses might not get closed */
1108
perror("kill");
1109
}
948
1110
}
949
free(process_list->buffer);
950
free(process_list);
951
1111
}
952
1112
953
1113
/* Wait for any remaining child processes to terminate */
958
1118
perror("wait");
959
1119
}
960
1120
1121
free_plugin_list();
1122
1123
free(plugindir);
1124
free(argfile);
1125
961
1126
return exitstatus;
962
1127
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0