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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:
- 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
SIG_UNBLOCK, kill() */
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
65
67
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
66
69
67
70
#define BUFFER_SIZE 256
68
71
69
const char *argp_program_version = "mandos-client 1.0";
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{
78
typedef struct plugin{
79
char *name; /* can be NULL or any plugin name */
80
char **argv;
81
int argc;
82
char **environ;
83
int envc;
84
bool disabled;
85
86
/* Variables used for running processes*/
75
87
pid_t pid;
76
88
int fd;
77
89
char *buffer;
78
90
size_t buffer_size;
79
91
size_t buffer_length;
80
92
bool eof;
81
bool completed;
93
volatile sig_atomic_t completed;
82
94
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;
91
95
struct plugin *next;
92
96
} plugin;
93
97
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))){
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))){
98
107
return p;
99
108
}
100
109
}
101
110
/* Create a new plugin */
102
111
plugin *new_plugin = malloc(sizeof(plugin));
103
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
112
if(new_plugin == NULL){
113
return NULL;
114
}
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
}
122
}
123
124
*new_plugin = (plugin){ .name = copy_name,
125
.argc = 1,
126
.disabled = false,
127
.next = plugin_list };
128
108
129
new_plugin->argv = malloc(sizeof(char *) * 2);
109
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
130
if(new_plugin->argv == NULL){
131
free(copy_name);
132
free(new_plugin);
133
return NULL;
112
134
}
113
new_plugin->argv[0] = name;
135
new_plugin->argv[0] = copy_name;
114
136
new_plugin->argv[1] = NULL;
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
137
138
new_plugin->environ = malloc(sizeof(char *));
139
if(new_plugin->environ == NULL){
140
free(copy_name);
141
free(new_plugin->argv);
142
free(new_plugin);
143
return NULL;
144
}
145
new_plugin->environ[0] = NULL;
146
118
147
/* Append the new plugin to the list */
119
*plugin_list = new_plugin;
148
plugin_list = new_plugin;
120
149
return new_plugin;
121
150
}
122
151
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;
152
/* Helper function for add_argument and add_environment */
153
static bool add_to_char_array(const char *new, char ***array,
154
int *len){
155
/* Resize the pointed-to array to hold one more pointer */
156
*array = realloc(*array, sizeof(char *)
157
* (size_t) ((*len) + 2));
158
/* Malloc check */
159
if(*array == NULL){
160
return false;
161
}
162
/* Make a copy of the new string */
163
char *copy = strdup(new);
164
if(copy == NULL){
165
return false;
166
}
167
/* Insert the copy */
168
(*array)[*len] = copy;
169
(*len)++;
170
/* Add a new terminating NULL pointer to the last element */
171
(*array)[*len] = NULL;
172
return true;
173
}
174
175
/* Add to a plugin's argument vector */
176
static bool add_argument(plugin *p, const char *arg){
177
if(p == NULL){
178
return false;
179
}
180
return add_to_char_array(arg, &(p->argv), &(p->argc));
181
}
182
183
/* Add to a plugin's environment */
184
static bool add_environment(plugin *p, const char *def, bool replace){
185
if(p == NULL){
186
return false;
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
}
205
return add_to_char_array(def, &(p->environ), &(p->envc));
132
206
}
133
207
134
208
/*
136
210
* Descriptor Flags".
137
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
138
212
*/
139
static int set_cloexec_flag(int fd)
140
{
213
static int set_cloexec_flag(int fd){
141
214
int ret = fcntl(fd, F_GETFD, 0);
142
215
/* If reading the flags failed, return error indication now. */
143
216
if(ret < 0){
147
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
148
221
}
149
222
150
process *process_list = NULL;
151
223
152
/* Mark a process as completed when it exits, and save its exit
224
/* Mark processes as completed when they exit, and save their exit
153
225
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;
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;
171
256
}
172
257
173
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){
174
260
ssize_t ret;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
178
261
for(size_t written = 0; written < length; written += (size_t)ret){
179
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
180
263
length - written));
185
268
return true;
186
269
}
187
270
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
}
295
}
296
}
297
298
free(plugin_node);
299
}
300
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
305
}
306
188
307
int main(int argc, char *argv[]){
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
308
char *plugindir = NULL;
309
char *argfile = NULL;
310
FILE *conffp;
190
311
size_t d_name_len;
191
312
DIR *dir = NULL;
192
313
struct dirent *dirst;
193
314
struct stat st;
194
315
fd_set rfds_all;
195
316
int ret, maxfd = 0;
317
ssize_t sret;
318
intmax_t tmpmax;
196
319
uid_t uid = 65534;
197
320
gid_t gid = 65534;
198
321
bool debug = false;
200
323
struct sigaction old_sigchld_action;
201
324
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
202
325
.sa_flags = SA_NOCLDSTOP };
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
206
errno = 0;
326
char **custom_argv = NULL;
327
int custom_argc = 0;
207
328
208
329
/* Establish a signal handler */
209
330
sigemptyset(&sigchld_action.sa_mask);
210
331
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
211
if(ret < 0){
332
if(ret == -1){
212
333
perror("sigaddset");
213
exit(EXIT_FAILURE);
334
exitstatus = EXIT_FAILURE;
335
goto fallback;
214
336
}
215
337
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
216
if(ret < 0){
338
if(ret == -1){
217
339
perror("sigaction");
218
exit(EXIT_FAILURE);
340
exitstatus = EXIT_FAILURE;
341
goto fallback;
219
342
}
220
343
221
344
/* The options we understand. */
223
346
{ .name = "global-options", .key = 'g',
224
347
.arg = "OPTION[,OPTION[,...]]",
225
348
.doc = "Options passed to all plugins" },
349
{ .name = "global-env", .key = 'G',
350
.arg = "VAR=value",
351
.doc = "Environment variable passed to all plugins" },
226
352
{ .name = "options-for", .key = 'o',
227
353
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
228
354
.doc = "Options passed only to specified plugin" },
355
{ .name = "env-for", .key = 'E',
356
.arg = "PLUGIN:ENV=value",
357
.doc = "Environment variable passed to specified plugin" },
229
358
{ .name = "disable", .key = 'd',
230
359
.arg = "PLUGIN",
231
360
.doc = "Disable a specific plugin", .group = 1 },
361
{ .name = "enable", .key = 'e',
362
.arg = "PLUGIN",
363
.doc = "Enable a specific plugin", .group = 1 },
232
364
{ .name = "plugin-dir", .key = 128,
233
365
.arg = "DIRECTORY",
234
366
.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 },
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 },
243
378
{ .name = NULL }
244
379
};
245
380
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:
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'){
390
continue;
391
}
392
if(not add_argument(getplugin(NULL), plugin_option)){
393
perror("add_argument");
394
return ARGP_ERR_UNKNOWN;
395
}
396
}
397
}
398
break;
399
case 'G': /* --global-env */
400
if(arg == NULL){
401
break;
402
}
403
if(not add_environment(getplugin(NULL), arg, true)){
404
perror("add_environment");
405
}
406
break;
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;
418
}
419
}
420
}
421
break;
422
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
426
{
427
char *envdef = strchr(arg, ':');
428
if(envdef == NULL){
429
break;
430
}
431
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
434
}
435
}
436
break;
437
case 'd': /* --disable */
438
if(arg != NULL){
439
plugin *p = getplugin(arg);
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
442
}
443
p->disabled = true;
444
}
445
break;
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 */
288
488
debug = true;
289
489
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]",
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 = "",
308
546
.doc = "Mandos plugin runner -- Run plugins" };
309
547
310
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
311
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){
312
552
fprintf(stderr, "Unknown error while parsing arguments\n");
313
553
exitstatus = EXIT_FAILURE;
314
goto end;
554
goto fallback;
315
555
}
316
556
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){
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
}
566
if(conffp != NULL){
567
char *org_line = NULL;
568
char *p, *arg, *new_arg, *line;
569
size_t size = 0;
570
const char whitespace_delims[] = " \r\t\f\v\n";
571
const char comment_delim[] = "#";
572
573
custom_argc = 1;
574
custom_argv = malloc(sizeof(char*) * 2);
575
if(custom_argv == NULL){
327
576
perror("malloc");
328
577
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){
578
goto fallback;
579
}
580
custom_argv[0] = argv[0];
581
custom_argv[1] = NULL;
582
583
/* for each line in the config file, strip whitespace and ignore
584
commented text */
585
while(true){
586
sret = getline(&org_line, &size, conffp);
587
if(sret == -1){
588
break;
589
}
590
591
line = org_line;
592
arg = strsep(&line, comment_delim);
593
while((p = strsep(&arg, whitespace_delims)) != NULL){
594
if(p[0] == '\0'){
595
continue;
596
}
597
new_arg = strdup(p);
598
if(new_arg == NULL){
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
601
free(org_line);
602
goto fallback;
603
}
604
605
custom_argc += 1;
606
custom_argv = realloc(custom_argv, sizeof(char *)
607
* ((unsigned int) custom_argc + 1));
608
if(custom_argv == NULL){
609
perror("realloc");
610
exitstatus = EXIT_FAILURE;
611
free(org_line);
612
goto fallback;
613
}
614
custom_argv[custom_argc-1] = new_arg;
615
custom_argv[custom_argc] = NULL;
616
}
617
}
618
free(org_line);
619
} else {
620
/* Check for harmful errors and go to fallback. Other errors might
621
not affect opening plugins */
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
perror("fopen");
624
exitstatus = EXIT_FAILURE;
625
goto fallback;
626
}
627
}
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
630
if(custom_argv != NULL){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
349
634
fprintf(stderr, "Unknown error while parsing arguments\n");
350
635
exitstatus = EXIT_FAILURE;
351
goto end;
636
goto fallback;
352
637
}
353
638
}
354
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
355
649
if(debug){
356
650
for(plugin *p = plugin_list; p != NULL; p=p->next){
357
651
fprintf(stderr, "Plugin: %s has %d arguments\n",
359
653
for(char **a = p->argv; *a != NULL; a++){
360
654
fprintf(stderr, "\tArg: %s\n", *a);
361
655
}
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
657
for(char **a = p->environ; *a != NULL; a++){
658
fprintf(stderr, "\t%s\n", *a);
659
}
362
660
}
363
661
}
364
662
663
/* Strip permissions down to nobody */
664
setgid(gid);
665
if(ret == -1){
666
perror("setgid");
667
}
365
668
ret = setuid(uid);
366
if (ret == -1){
669
if(ret == -1){
367
670
perror("setuid");
368
671
}
369
672
370
setgid(gid);
371
if (ret == -1){
372
perror("setgid");
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
373
677
}
374
678
375
dir = opendir(plugindir);
376
679
if(dir == NULL){
377
680
perror("Could not open plugin dir");
378
681
exitstatus = EXIT_FAILURE;
379
goto end;
682
goto fallback;
380
683
}
381
684
382
685
/* Set the FD_CLOEXEC flag on the directory, if possible */
387
690
if(ret < 0){
388
691
perror("set_cloexec_flag");
389
692
exitstatus = EXIT_FAILURE;
390
goto end;
693
goto fallback;
391
694
}
392
695
}
393
696
}
394
697
395
698
FD_ZERO(&rfds_all);
396
699
700
/* Read and execute any executable in the plugin directory*/
397
701
while(true){
398
702
dirst = readdir(dir);
399
703
400
// All directory entries have been processed
704
/* All directory entries have been processed */
401
705
if(dirst == NULL){
402
if (errno == EBADF){
706
if(errno == EBADF){
403
707
perror("readdir");
404
708
exitstatus = EXIT_FAILURE;
405
goto end;
709
goto fallback;
406
710
}
407
711
break;
408
712
}
409
713
410
714
d_name_len = strlen(dirst->d_name);
411
715
412
// Ignore dotfiles, backup files and other junk
716
/* Ignore dotfiles, backup files and other junk */
413
717
{
414
718
bool bad_name = false;
415
719
417
721
418
722
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
419
723
".dpkg-old",
724
".dpkg-bak",
420
725
".dpkg-divert", NULL };
421
726
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
422
727
size_t pre_len = strlen(*pre);
430
735
break;
431
736
}
432
737
}
433
434
738
if(bad_name){
435
739
continue;
436
740
}
437
438
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
439
742
size_t suf_len = strlen(*suf);
440
743
if((d_name_len >= suf_len)
454
757
}
455
758
}
456
759
457
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
458
if (filename == NULL){
459
perror("malloc");
460
exitstatus = EXIT_FAILURE;
461
goto end;
462
}
463
strcpy(filename, plugindir); /* Spurious warning */
464
strcat(filename, "/"); /* Spurious warning */
465
strcat(filename, dirst->d_name); /* Spurious warning */
760
char *filename;
761
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
763
} else {
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
765
}
766
if(ret < 0){
767
perror("asprintf");
768
continue;
769
}
466
770
467
771
ret = stat(filename, &st);
468
if (ret == -1){
772
if(ret == -1){
469
773
perror("stat");
470
exitstatus = EXIT_FAILURE;
471
goto end;
774
free(filename);
775
continue;
472
776
}
473
777
474
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)){
475
780
if(debug){
476
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
477
782
" with bad type or mode\n", filename);
479
784
free(filename);
480
785
continue;
481
786
}
482
if(getplugin(dirst->d_name, &plugin_list)->disabled){
787
788
plugin *p = getplugin(dirst->d_name);
789
if(p == NULL){
790
perror("getplugin");
791
free(filename);
792
continue;
793
}
794
if(p->disabled){
483
795
if(debug){
484
796
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
485
797
dirst->d_name);
487
799
free(filename);
488
800
continue;
489
801
}
490
plugin *p = getplugin(dirst->d_name, &plugin_list);
491
802
{
492
803
/* Add global arguments to argument list for this plugin */
493
plugin *g = getplugin(NULL, &plugin_list);
494
for(char **a = g->argv + 1; *a != NULL; a++){
495
addargument(p, *a);
496
}
497
}
498
int pipefd[2];
804
plugin *g = getplugin(NULL);
805
if(g != NULL){
806
for(char **a = g->argv + 1; *a != NULL; a++){
807
if(not add_argument(p, *a)){
808
perror("add_argument");
809
}
810
}
811
/* Add global environment variables */
812
for(char **e = g->environ; *e != NULL; e++){
813
if(not add_environment(p, *e, false)){
814
perror("add_environment");
815
}
816
}
817
}
818
}
819
/* If this plugin has any environment variables, we will call
820
using execve and need to duplicate the environment from this
821
process, too. */
822
if(p->environ[0] != NULL){
823
for(char **e = environ; *e != NULL; e++){
824
if(not add_environment(p, *e, false)){
825
perror("add_environment");
826
}
827
}
828
}
829
830
int pipefd[2];
499
831
ret = pipe(pipefd);
500
if (ret == -1){
832
if(ret == -1){
501
833
perror("pipe");
502
834
exitstatus = EXIT_FAILURE;
503
goto end;
835
goto fallback;
504
836
}
837
/* Ask OS to automatic close the pipe on exec */
505
838
ret = set_cloexec_flag(pipefd[0]);
506
839
if(ret < 0){
507
840
perror("set_cloexec_flag");
508
841
exitstatus = EXIT_FAILURE;
509
goto end;
842
goto fallback;
510
843
}
511
844
ret = set_cloexec_flag(pipefd[1]);
512
845
if(ret < 0){
513
846
perror("set_cloexec_flag");
514
847
exitstatus = EXIT_FAILURE;
515
goto end;
848
goto fallback;
516
849
}
517
850
/* Block SIGCHLD until process is safely in process list */
518
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
519
852
if(ret < 0){
520
853
perror("sigprocmask");
521
854
exitstatus = EXIT_FAILURE;
522
goto end;
855
goto fallback;
523
856
}
524
// Starting a new process to be watched
857
/* Starting a new process to be watched */
525
858
pid_t pid = fork();
859
if(pid == -1){
860
perror("fork");
861
exitstatus = EXIT_FAILURE;
862
goto fallback;
863
}
526
864
if(pid == 0){
527
865
/* this is the child process */
528
866
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
530
868
perror("sigaction");
531
869
_exit(EXIT_FAILURE);
532
870
}
533
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
534
872
if(ret < 0){
535
873
perror("sigprocmask");
536
874
_exit(EXIT_FAILURE);
537
875
}
538
876
539
877
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
540
878
if(ret == -1){
541
879
perror("dup2");
547
885
above and must now close it manually here. */
548
886
closedir(dir);
549
887
}
550
if(execv(filename, p->argv) < 0){
551
perror("execv");
552
_exit(EXIT_FAILURE);
888
if(p->environ[0] == NULL){
889
if(execv(filename, p->argv) < 0){
890
perror("execv");
891
_exit(EXIT_FAILURE);
892
}
893
} else {
894
if(execve(filename, p->argv, p->environ) < 0){
895
perror("execve");
896
_exit(EXIT_FAILURE);
897
}
553
898
}
554
899
/* no return */
555
900
}
556
/* parent process */
901
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
557
903
free(filename);
558
close(pipefd[1]); /* close unused write end of pipe */
559
process *new_process = malloc(sizeof(process));
560
if (new_process == NULL){
561
perror("malloc");
562
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);
563
908
if(ret < 0){
564
perror("sigprocmask");
909
perror("sigprocmask");
565
910
}
566
911
exitstatus = EXIT_FAILURE;
567
goto end;
912
goto fallback;
568
913
}
569
914
570
*new_process = (struct process){ .pid = pid,
571
.fd = pipefd[0],
572
.next = process_list };
573
// List handling
574
process_list = new_process;
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
917
575
918
/* Unblock SIGCHLD so signal handler can be run if this process
576
919
has already completed */
577
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
578
921
if(ret < 0){
579
922
perror("sigprocmask");
580
923
exitstatus = EXIT_FAILURE;
581
goto end;
582
}
583
584
FD_SET(new_process->fd, &rfds_all);
585
586
if (maxfd < new_process->fd){
587
maxfd = new_process->fd;
588
}
589
590
}
591
592
/* Free the plugin list */
593
for(plugin *next; plugin_list != NULL; plugin_list = next){
594
next = plugin_list->next;
595
free(plugin_list->argv);
596
free(plugin_list);
924
goto fallback;
925
}
926
927
FD_SET(new_plugin->fd, &rfds_all);
928
929
if(maxfd < new_plugin->fd){
930
maxfd = new_plugin->fd;
931
}
597
932
}
598
933
599
934
closedir(dir);
600
935
dir = NULL;
601
602
if (process_list == NULL){
603
fprintf(stderr, "No plugin processes started. Incorrect plugin"
604
" directory?\n");
605
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
}
606
947
}
607
while(process_list){
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
608
951
fd_set rfds = rfds_all;
609
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
610
if (select_ret == -1){
953
if(select_ret == -1){
611
954
perror("select");
612
955
exitstatus = EXIT_FAILURE;
613
goto end;
956
goto fallback;
614
957
}
615
958
/* OK, now either a process completed, or something can be read
616
959
from one of them */
617
for(process *proc = process_list; proc ; proc = proc->next){
960
for(plugin *proc = plugin_list; proc != NULL;){
618
961
/* Is this process completely done? */
619
if(proc->eof and proc->completed){
962
if(proc->completed and proc->eof){
620
963
/* Only accept the plugin output if it exited cleanly */
621
964
if(not WIFEXITED(proc->status)
622
965
or WEXITSTATUS(proc->status) != 0){
623
966
/* Bad exit by plugin */
967
624
968
if(debug){
625
969
if(WIFEXITED(proc->status)){
626
fprintf(stderr, "Plugin %u exited with status %d\n",
627
(unsigned int) (proc->pid),
970
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
971
" status %d\n", proc->name,
972
(intmax_t) (proc->pid),
628
973
WEXITSTATUS(proc->status));
629
} else if(WIFSIGNALED(proc->status)) {
630
fprintf(stderr, "Plugin %u killed by signal %d\n",
631
(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),
632
978
WTERMSIG(proc->status));
633
979
} else if(WCOREDUMP(proc->status)){
634
fprintf(stderr, "Plugin %d dumped core\n",
635
(unsigned int) (proc->pid));
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
981
" core\n", proc->name, (intmax_t) (proc->pid));
636
982
}
637
983
}
984
638
985
/* Remove the plugin */
639
986
FD_CLR(proc->fd, &rfds_all);
987
640
988
/* Block signal while modifying process_list */
641
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
642
990
if(ret < 0){
643
991
perror("sigprocmask");
644
992
exitstatus = EXIT_FAILURE;
645
goto end;
646
}
647
/* Delete this process entry from the list */
648
if(process_list == proc){
649
/* First one - simple */
650
process_list = proc->next;
651
} else {
652
/* Second one or later */
653
for(process *p = process_list; p != NULL; p = p->next){
654
if(p->next == proc){
655
p->next = proc->next;
656
break;
657
}
658
}
659
}
993
goto fallback;
994
}
995
996
plugin *next_plugin = proc->next;
997
free_plugin(proc);
998
proc = next_plugin;
999
660
1000
/* We are done modifying process list, so unblock signal */
661
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
662
NULL);
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
663
1003
if(ret < 0){
664
1004
perror("sigprocmask");
665
}
666
free(proc->buffer);
667
free(proc);
668
/* We deleted this process from the list, so we can't go
669
proc->next. Therefore, start over from the beginning of
670
the process list */
671
break;
1005
exitstatus = EXIT_FAILURE;
1006
goto fallback;
1007
}
1008
1009
if(plugin_list == NULL){
1010
break;
1011
}
1012
1013
continue;
672
1014
}
1015
673
1016
/* This process exited nicely, so print its buffer */
674
675
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1017
1018
bool bret = print_out_password(proc->buffer,
1019
proc->buffer_length);
676
1020
if(not bret){
677
1021
perror("print_out_password");
678
1022
exitstatus = EXIT_FAILURE;
679
1023
}
680
goto end;
1024
goto fallback;
681
1025
}
1026
682
1027
/* This process has not completed. Does it have any output? */
683
1028
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
684
1029
/* This process had nothing to say at this time */
1030
proc = proc->next;
685
1031
continue;
686
1032
}
687
1033
/* Before reading, make the process' data buffer large enough */
688
1034
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
689
1035
proc->buffer = realloc(proc->buffer, proc->buffer_size
690
1036
+ (size_t) BUFFER_SIZE);
691
if (proc->buffer == NULL){
1037
if(proc->buffer == NULL){
692
1038
perror("malloc");
693
1039
exitstatus = EXIT_FAILURE;
694
goto end;
1040
goto fallback;
695
1041
}
696
1042
proc->buffer_size += BUFFER_SIZE;
697
1043
}
698
1044
/* Read from the process */
699
ret = read(proc->fd, proc->buffer + proc->buffer_length,
700
BUFFER_SIZE);
701
if(ret < 0){
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1047
if(sret < 0){
702
1048
/* Read error from this process; ignore the error */
1049
proc = proc->next;
703
1050
continue;
704
1051
}
705
if(ret == 0){
1052
if(sret == 0){
706
1053
/* got EOF */
707
1054
proc->eof = true;
708
1055
} else {
709
proc->buffer_length += (size_t) ret;
1056
proc->buffer_length += (size_t) sret;
710
1057
}
711
1058
}
712
1059
}
713
714
715
end:
716
717
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
718
/* Fallback if all plugins failed or an error occured */
1060
1061
1062
fallback:
1063
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1065
/* Fallback if all plugins failed, none are found or an error
1066
occured */
719
1067
bool bret;
720
1068
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
721
1069
char *passwordbuffer = getpass("Password: ");
722
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);
723
1077
if(not bret){
724
1078
perror("print_out_password");
725
1079
exitstatus = EXIT_FAILURE;
726
goto end;
727
1080
}
728
1081
}
729
1082
730
1083
/* Restore old signal handler */
731
sigaction(SIGCHLD, &old_sigchld_action, NULL);
732
733
free(plus_argv);
734
735
/* Free the plugin list */
736
for(plugin *next; plugin_list != NULL; plugin_list = next){
737
next = plugin_list->next;
738
free(plugin_list->argv);
739
free(plugin_list);
1084
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1085
if(ret == -1){
1086
perror("sigaction");
1087
exitstatus = EXIT_FAILURE;
1088
}
1089
1090
if(custom_argv != NULL){
1091
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1092
free(*arg);
1093
}
1094
free(custom_argv);
740
1095
}
741
1096
742
1097
if(dir != NULL){
743
1098
closedir(dir);
744
1099
}
745
1100
746
/* Free the process list and kill the processes */
747
for(process *next; process_list != NULL; process_list = next){
748
next = process_list->next;
749
close(process_list->fd);
750
ret = kill(process_list->pid, SIGTERM);
751
if(ret == -1 and errno != ESRCH){
752
/* set-uid proccesses migth not get closed */
753
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
}
754
1110
}
755
free(process_list->buffer);
756
free(process_list);
757
1111
}
758
1112
759
1113
/* Wait for any remaining child processes to terminate */
764
1118
perror("wait");
765
1119
}
766
1120
1121
free_plugin_list();
1122
1123
free(plugindir);
1124
free(argfile);
1125
767
1126
return exitstatus;
768
1127
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0