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- Committer: Teddy Hogeborn
- Date: 2008-08-11 08:04:35 UTC
- Revision ID: teddy@fukt.bsnet.se-20080811080435-7qfkwv5g43ww5h9x
* plugins.d/password-request.c (main): Bug fix: Bring up network
interface *before* dropping
privileges.
interface *before* dropping
privileges.
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
mandos-client.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
22
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
27
26
#include <stddef.h> /* size_t, NULL */
28
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
33
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
47
46
fcntl(), setuid(), setgid(),
48
47
F_GETFD, F_SETFD, FD_CLOEXEC,
49
48
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
51
50
execv(), write(), read(),
52
51
close() */
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
53
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
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,
61
error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
61
#include <signal.h> /* struct sigaction, sigemptyset(),
63
62
sigaddset(), sigaction(),
64
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
66
68
67
#define BUFFER_SIZE 256
69
68
70
#define PDIR "/lib/mandos/plugins.d"
71
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
73
const char *argp_program_version = "plugin-runner " VERSION;
69
const char *argp_program_version = "mandos-client 1.0";
74
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
75
71
76
typedef struct plugin{
77
char *name; /* can be NULL or any plugin name */
78
char **argv;
79
int argc;
80
char **environ;
81
int envc;
82
bool disabled;
72
struct process;
83
73
84
/* Variables used for running processes*/
74
typedef struct process{
85
75
pid_t pid;
86
76
int fd;
87
77
char *buffer;
88
78
size_t buffer_size;
89
79
size_t buffer_length;
90
80
bool eof;
91
volatile bool completed;
92
volatile int status;
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;
93
91
struct plugin *next;
94
92
} plugin;
95
93
96
static plugin *plugin_list = NULL;
97
98
/* Gets an existing plugin based on name,
99
or if none is found, creates a new one */
100
static plugin *getplugin(char *name){
101
/* Check for exiting plugin with that name */
102
for(plugin *p = plugin_list; p != NULL; p = p->next){
103
if((p->name == name)
104
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
105
98
return p;
106
99
}
107
100
}
108
101
/* Create a new plugin */
109
102
plugin *new_plugin = malloc(sizeof(plugin));
110
if(new_plugin == NULL){
111
return NULL;
112
}
113
char *copy_name = NULL;
114
if(name != NULL){
115
copy_name = strdup(name);
116
if(copy_name == NULL){
117
return NULL;
118
}
119
}
120
121
*new_plugin = (plugin) { .name = copy_name,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
125
103
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
126
108
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if(new_plugin->argv == NULL){
128
free(copy_name);
129
free(new_plugin);
130
return NULL;
109
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
131
112
}
132
new_plugin->argv[0] = copy_name;
113
new_plugin->argv[0] = name;
133
114
new_plugin->argv[1] = NULL;
134
135
new_plugin->environ = malloc(sizeof(char *));
136
if(new_plugin->environ == NULL){
137
free(copy_name);
138
free(new_plugin->argv);
139
free(new_plugin);
140
return NULL;
141
}
142
new_plugin->environ[0] = NULL;
143
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
144
118
/* Append the new plugin to the list */
145
plugin_list = new_plugin;
119
*plugin_list = new_plugin;
146
120
return new_plugin;
147
121
}
148
122
149
/* Helper function for add_argument and add_environment */
150
static bool add_to_char_array(const char *new, char ***array,
151
int *len){
152
/* Resize the pointed-to array to hold one more pointer */
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
155
/* Malloc check */
156
if(*array == NULL){
157
return false;
158
}
159
/* Make a copy of the new string */
160
char *copy = strdup(new);
161
if(copy == NULL){
162
return false;
163
}
164
/* Insert the copy */
165
(*array)[*len] = copy;
166
(*len)++;
167
/* Add a new terminating NULL pointer to the last element */
168
(*array)[*len] = NULL;
169
return true;
170
}
171
172
/* Add to a plugin's argument vector */
173
static bool add_argument(plugin *p, const char *arg){
174
if(p == NULL){
175
return false;
176
}
177
return add_to_char_array(arg, &(p->argv), &(p->argc));
178
}
179
180
/* Add to a plugin's environment */
181
static bool add_environment(plugin *p, const char *def, bool replace){
182
if(p == NULL){
183
return false;
184
}
185
/* namelen = length of name of environment variable */
186
size_t namelen = (size_t)(strchrnul(def, '=') - def);
187
/* Search for this environment variable */
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
190
/* It already exists */
191
if(replace){
192
char *new = realloc(*e, strlen(def) + 1);
193
if(new == NULL){
194
return false;
195
}
196
*e = new;
197
strcpy(*e, def);
198
}
199
return true;
200
}
201
}
202
return add_to_char_array(def, &(p->environ), &(p->envc));
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;
203
132
}
204
133
205
134
/*
207
136
* Descriptor Flags".
208
137
* *Note File Descriptor Flags:(libc)Descriptor Flags.
209
138
*/
210
static int set_cloexec_flag(int fd){
139
static int set_cloexec_flag(int fd)
140
{
211
141
int ret = fcntl(fd, F_GETFD, 0);
212
142
/* If reading the flags failed, return error indication now. */
213
143
if(ret < 0){
217
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
218
148
}
219
149
150
process *process_list = NULL;
220
151
221
/* Mark processes as completed when they exit, and save their exit
152
/* Mark a process as completed when it exits, and save its exit
222
153
status. */
223
static void handle_sigchld(__attribute__((unused)) int sig){
224
while(true){
225
plugin *proc = plugin_list;
226
int status;
227
pid_t pid = waitpid(-1, &status, WNOHANG);
228
if(pid == 0){
229
/* Only still running child processes */
230
break;
231
}
232
if(pid == -1){
233
if(errno != ECHILD){
234
perror("waitpid");
235
}
236
/* No child processes */
237
break;
238
}
239
240
/* A child exited, find it in process_list */
241
while(proc != NULL and proc->pid != pid){
242
proc = proc->next;
243
}
244
if(proc == NULL){
245
/* Process not found in process list */
246
continue;
247
}
248
proc->status = status;
249
proc->completed = true;
250
}
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;
251
171
}
252
172
253
/* Prints out a password to stdout */
254
static bool print_out_password(const char *buffer, size_t length){
173
bool print_out_password(const char *buffer, size_t length){
255
174
ssize_t ret;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
256
178
for(size_t written = 0; written < length; written += (size_t)ret){
257
179
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
258
180
length - written));
263
185
return true;
264
186
}
265
187
266
/* Removes and free a plugin from the plugin list */
267
static void free_plugin(plugin *plugin_node){
268
269
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
270
free(*arg);
271
}
272
free(plugin_node->argv);
273
for(char **env = plugin_node->environ; *env != NULL; env++){
274
free(*env);
275
}
276
free(plugin_node->environ);
277
free(plugin_node->buffer);
278
279
/* Removes the plugin from the singly-linked list */
280
if(plugin_node == plugin_list){
281
/* First one - simple */
282
plugin_list = plugin_list->next;
283
} else {
284
/* Second one or later */
285
for(plugin *p = plugin_list; p != NULL; p = p->next){
286
if(p->next == plugin_node){
287
p->next = plugin_node->next;
288
break;
289
}
290
}
291
}
292
293
free(plugin_node);
294
}
295
296
static void free_plugin_list(void){
297
while(plugin_list != NULL){
298
free_plugin(plugin_list);
299
}
300
}
301
302
188
int main(int argc, char *argv[]){
303
char *plugindir = NULL;
304
char *argfile = NULL;
305
FILE *conffp;
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
306
190
size_t d_name_len;
307
191
DIR *dir = NULL;
308
192
struct dirent *dirst;
309
193
struct stat st;
310
194
fd_set rfds_all;
311
195
int ret, maxfd = 0;
312
ssize_t sret;
313
196
uid_t uid = 65534;
314
197
gid_t gid = 65534;
315
198
bool debug = false;
317
200
struct sigaction old_sigchld_action;
318
201
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
319
202
.sa_flags = SA_NOCLDSTOP };
320
char **custom_argv = NULL;
321
int custom_argc = 0;
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
322
205
323
206
/* Establish a signal handler */
324
207
sigemptyset(&sigchld_action.sa_mask);
325
208
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
326
if(ret == -1){
209
if(ret < 0){
327
210
perror("sigaddset");
328
exitstatus = EXIT_FAILURE;
329
goto fallback;
211
exit(EXIT_FAILURE);
330
212
}
331
213
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
332
if(ret == -1){
214
if(ret < 0){
333
215
perror("sigaction");
334
exitstatus = EXIT_FAILURE;
335
goto fallback;
216
exit(EXIT_FAILURE);
336
217
}
337
218
338
219
/* The options we understand. */
340
221
{ .name = "global-options", .key = 'g',
341
222
.arg = "OPTION[,OPTION[,...]]",
342
223
.doc = "Options passed to all plugins" },
343
{ .name = "global-env", .key = 'G',
344
.arg = "VAR=value",
345
.doc = "Environment variable passed to all plugins" },
346
224
{ .name = "options-for", .key = 'o',
347
225
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
348
226
.doc = "Options passed only to specified plugin" },
349
{ .name = "env-for", .key = 'E',
350
.arg = "PLUGIN:ENV=value",
351
.doc = "Environment variable passed to specified plugin" },
352
227
{ .name = "disable", .key = 'd',
353
228
.arg = "PLUGIN",
354
229
.doc = "Disable a specific plugin", .group = 1 },
355
{ .name = "enable", .key = 'e',
356
.arg = "PLUGIN",
357
.doc = "Enable a specific plugin", .group = 1 },
358
230
{ .name = "plugin-dir", .key = 128,
359
231
.arg = "DIRECTORY",
360
232
.doc = "Specify a different plugin directory", .group = 2 },
361
{ .name = "config-file", .key = 129,
362
.arg = "FILE",
363
.doc = "Specify a different configuration file", .group = 2 },
364
{ .name = "userid", .key = 130,
365
.arg = "ID", .flags = 0,
366
.doc = "User ID the plugins will run as", .group = 3 },
367
{ .name = "groupid", .key = 131,
368
.arg = "ID", .flags = 0,
369
.doc = "Group ID the plugins will run as", .group = 3 },
370
{ .name = "debug", .key = 132,
371
.doc = "Debug mode", .group = 4 },
233
{ .name = "userid", .key = 129,
234
.arg = "ID", .flags = 0,
235
.doc = "User ID the plugins will run as", .group = 2 },
236
{ .name = "groupid", .key = 130,
237
.arg = "ID", .flags = 0,
238
.doc = "Group ID the plugins will run as", .group = 2 },
239
{ .name = "debug", .key = 131,
240
.doc = "Debug mode", .group = 3 },
372
241
{ .name = NULL }
373
242
};
374
243
375
error_t parse_opt(int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
377
switch(key) {
378
case 'g': /* --global-options */
379
if(arg != NULL){
380
char *p;
381
while((p = strsep(&arg, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(NULL), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
389
}
390
}
391
break;
392
case 'G': /* --global-env */
393
if(arg == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
398
}
399
break;
400
case 'o': /* --options-for */
401
if(arg != NULL){
402
char *p_name = strsep(&arg, ":");
403
if(p_name[0] == '\0' or arg == NULL){
404
break;
405
}
406
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
408
break;
409
}
410
char *p;
411
while((p = strsep(&opt, ",")) != NULL){
412
if(p[0] == '\0'){
413
continue;
414
}
415
if(not add_argument(getplugin(p_name), p)){
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
/* In the GNU C library, uid_t is always unsigned int */
467
ret = sscanf(arg, "%u", &uid);
468
if(ret != 1){
469
fprintf(stderr, "Bad user ID number: \"%s\", using %u\n", arg,
470
uid);
471
}
472
break;
473
case 131: /* --groupid */
474
/* In the GNU C library, gid_t is always unsigned int */
475
ret = sscanf(arg, "%u", &gid);
476
if(ret != 1){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %u\n",
478
arg, gid);
479
}
480
break;
481
case 132: /* --debug */
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
245
/* Get the INPUT argument from `argp_parse', which we know is a
246
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
248
switch (key) {
249
case 'g':
250
if (arg != NULL){
251
char *p = strtok(arg, ",");
252
do{
253
addargument(getplugin(NULL, plugins), p);
254
p = strtok(NULL, ",");
255
} while (p != NULL);
256
}
257
break;
258
case 'o':
259
if (arg != NULL){
260
char *name = strtok(arg, ":");
261
char *p = strtok(NULL, ":");
262
if(p != NULL){
263
p = strtok(p, ",");
264
do{
265
addargument(getplugin(name, plugins), p);
266
p = strtok(NULL, ",");
267
} while (p != NULL);
268
}
269
}
270
break;
271
case 'd':
272
if (arg != NULL){
273
getplugin(arg, plugins)->disabled = true;
274
}
275
break;
276
case 128:
277
plugindir = arg;
278
break;
279
case 129:
280
uid = (uid_t)strtol(arg, NULL, 10);
281
break;
282
case 130:
283
gid = (gid_t)strtol(arg, NULL, 10);
284
break;
285
case 131:
482
286
debug = true;
483
287
break;
484
/*
485
* When adding more options before this line, remember to also add a
486
* "case" to the "parse_opt_config_file" function below.
487
*/
488
case ARGP_KEY_ARG:
489
/* Cryptsetup always passes an argument, which is an empty
490
string if "none" was specified in /etc/crypttab. So if
491
argument was empty, we ignore it silently. */
492
if(arg[0] != '\0'){
493
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
494
}
495
break;
496
case ARGP_KEY_END:
497
break;
498
default:
499
return ARGP_ERR_UNKNOWN;
500
}
501
return 0;
502
}
503
504
/* This option parser is the same as parse_opt() above, except it
505
ignores everything but the --config-file option. */
506
error_t parse_opt_config_file(int key, char *arg,
507
__attribute__((unused))
508
struct argp_state *state) {
509
switch(key) {
510
case 'g': /* --global-options */
511
case 'G': /* --global-env */
512
case 'o': /* --options-for */
513
case 'E': /* --env-for */
514
case 'd': /* --disable */
515
case 'e': /* --enable */
516
case 128: /* --plugin-dir */
517
break;
518
case 129: /* --config-file */
519
free(argfile);
520
argfile = strdup(arg);
521
if(argfile == NULL){
522
perror("strdup");
523
}
524
break;
525
case 130: /* --userid */
526
case 131: /* --groupid */
527
case 132: /* --debug */
528
case ARGP_KEY_ARG:
529
case ARGP_KEY_END:
530
break;
531
default:
532
return ARGP_ERR_UNKNOWN;
533
}
534
return 0;
535
}
536
537
struct argp argp = { .options = options,
538
.parser = parse_opt_config_file,
539
.args_doc = "",
288
case ARGP_KEY_ARG:
289
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
290
argp_usage (state);
291
}
292
plus_options = arg;
293
break;
294
case ARGP_KEY_END:
295
break;
296
default:
297
return ARGP_ERR_UNKNOWN;
298
}
299
return 0;
300
}
301
302
plugin *plugin_list = NULL;
303
304
struct argp argp = { .options = options, .parser = parse_opt,
305
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
540
306
.doc = "Mandos plugin runner -- Run plugins" };
541
307
542
/* Parse using parse_opt_config_file() in order to get the custom
543
config file location, if any. */
544
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
545
if(ret == ARGP_ERR_UNKNOWN){
308
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
309
if (ret == ARGP_ERR_UNKNOWN){
546
310
fprintf(stderr, "Unknown error while parsing arguments\n");
547
311
exitstatus = EXIT_FAILURE;
548
goto fallback;
312
goto end;
549
313
}
550
314
551
/* Reset to the normal argument parser */
552
argp.parser = parse_opt;
553
554
/* Open the configfile if available */
555
if(argfile == NULL){
556
conffp = fopen(AFILE, "r");
557
} else {
558
conffp = fopen(argfile, "r");
559
}
560
if(conffp != NULL){
561
char *org_line = NULL;
562
char *p, *arg, *new_arg, *line;
563
size_t size = 0;
564
const char whitespace_delims[] = " \r\t\f\v\n";
565
const char comment_delim[] = "#";
566
567
custom_argc = 1;
568
custom_argv = malloc(sizeof(char*) * 2);
569
if(custom_argv == NULL){
315
if(plus_options){
316
/* This is a mangled argument in the form of
317
"+--option+--other-option=parameter+--yet-another-option", etc */
318
/* Make new argc and argv vars, and call argp_parse() again. */
319
plus_options++; /* skip the first '+' character */
320
const char delims[] = "+";
321
char *arg;
322
int new_argc = 1;
323
plus_argv = malloc(sizeof(char*) * 2);
324
if(plus_argv == NULL){
570
325
perror("malloc");
571
326
exitstatus = EXIT_FAILURE;
572
goto fallback;
573
}
574
custom_argv[0] = argv[0];
575
custom_argv[1] = NULL;
576
577
/* for each line in the config file, strip whitespace and ignore
578
commented text */
579
while(true){
580
sret = getline(&org_line, &size, conffp);
581
if(sret == -1){
582
break;
583
}
584
585
line = org_line;
586
arg = strsep(&line, comment_delim);
587
while((p = strsep(&arg, whitespace_delims)) != NULL){
588
if(p[0] == '\0'){
589
continue;
590
}
591
new_arg = strdup(p);
592
if(new_arg == NULL){
593
perror("strdup");
594
exitstatus = EXIT_FAILURE;
595
free(org_line);
596
goto fallback;
597
}
598
599
custom_argc += 1;
600
custom_argv = realloc(custom_argv, sizeof(char *)
601
* ((unsigned int) custom_argc + 1));
602
if(custom_argv == NULL){
603
perror("realloc");
604
exitstatus = EXIT_FAILURE;
605
free(org_line);
606
goto fallback;
607
}
608
custom_argv[custom_argc-1] = new_arg;
609
custom_argv[custom_argc] = NULL;
610
}
611
}
612
free(org_line);
613
} else {
614
/* Check for harmful errors and go to fallback. Other errors might
615
not affect opening plugins */
616
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
617
perror("fopen");
618
exitstatus = EXIT_FAILURE;
619
goto fallback;
620
}
621
}
622
/* If there was any arguments from configuration file,
623
pass them to parser as command arguments */
624
if(custom_argv != NULL){
625
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
626
0, NULL);
627
if(ret == ARGP_ERR_UNKNOWN){
327
goto end;
328
}
329
plus_argv[0] = argv[0];
330
plus_argv[1] = NULL;
331
arg = strtok(plus_options, delims); /* Get first argument */
332
while(arg != NULL){
333
new_argc++;
334
plus_argv = realloc(plus_argv, sizeof(char *)
335
* ((unsigned int) new_argc + 1));
336
if(plus_argv == NULL){
337
perror("realloc");
338
exitstatus = EXIT_FAILURE;
339
goto end;
340
}
341
plus_argv[new_argc-1] = arg;
342
plus_argv[new_argc] = NULL;
343
arg = strtok(NULL, delims); /* Get next argument */
344
}
345
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
346
if (ret == ARGP_ERR_UNKNOWN){
628
347
fprintf(stderr, "Unknown error while parsing arguments\n");
629
348
exitstatus = EXIT_FAILURE;
630
goto fallback;
349
goto end;
631
350
}
632
351
}
633
352
634
/* Parse actual command line arguments, to let them override the
635
config file */
636
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
637
if(ret == ARGP_ERR_UNKNOWN){
638
fprintf(stderr, "Unknown error while parsing arguments\n");
639
exitstatus = EXIT_FAILURE;
640
goto fallback;
641
}
642
643
353
if(debug){
644
354
for(plugin *p = plugin_list; p != NULL; p=p->next){
645
355
fprintf(stderr, "Plugin: %s has %d arguments\n",
647
357
for(char **a = p->argv; *a != NULL; a++){
648
358
fprintf(stderr, "\tArg: %s\n", *a);
649
359
}
650
fprintf(stderr, "...and %u environment variables\n", p->envc);
651
for(char **a = p->environ; *a != NULL; a++){
652
fprintf(stderr, "\t%s\n", *a);
653
}
654
360
}
655
361
}
656
362
657
/* Strip permissions down to nobody */
658
363
ret = setuid(uid);
659
if(ret == -1){
364
if (ret == -1){
660
365
perror("setuid");
661
}
366
}
367
662
368
setgid(gid);
663
if(ret == -1){
369
if (ret == -1){
664
370
perror("setgid");
665
371
}
666
372
667
if(plugindir == NULL){
668
dir = opendir(PDIR);
669
} else {
670
dir = opendir(plugindir);
671
}
672
373
dir = opendir(plugindir);
673
374
if(dir == NULL){
674
375
perror("Could not open plugin dir");
675
376
exitstatus = EXIT_FAILURE;
676
goto fallback;
377
goto end;
677
378
}
678
379
679
380
/* Set the FD_CLOEXEC flag on the directory, if possible */
684
385
if(ret < 0){
685
386
perror("set_cloexec_flag");
686
387
exitstatus = EXIT_FAILURE;
687
goto fallback;
388
goto end;
688
389
}
689
390
}
690
391
}
691
392
692
393
FD_ZERO(&rfds_all);
693
394
694
/* Read and execute any executable in the plugin directory*/
695
395
while(true){
696
396
dirst = readdir(dir);
697
397
698
/* All directory entries have been processed */
398
// All directory entries have been processed
699
399
if(dirst == NULL){
700
if(errno == EBADF){
400
if (errno == EBADF){
701
401
perror("readdir");
702
402
exitstatus = EXIT_FAILURE;
703
goto fallback;
403
goto end;
704
404
}
705
405
break;
706
406
}
707
407
708
408
d_name_len = strlen(dirst->d_name);
709
409
710
/* Ignore dotfiles, backup files and other junk */
410
// Ignore dotfiles, backup files and other junk
711
411
{
712
412
bool bad_name = false;
713
413
715
415
716
416
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
717
417
".dpkg-old",
718
".dpkg-bak",
719
418
".dpkg-divert", NULL };
720
419
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
721
420
size_t pre_len = strlen(*pre);
729
428
break;
730
429
}
731
430
}
431
732
432
if(bad_name){
733
433
continue;
734
434
}
435
735
436
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
736
437
size_t suf_len = strlen(*suf);
737
438
if((d_name_len >= suf_len)
750
451
continue;
751
452
}
752
453
}
753
754
char *filename;
755
if(plugindir == NULL){
756
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
757
} else {
758
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
759
}
760
if(ret < 0){
761
perror("asprintf");
762
continue;
763
}
454
455
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
456
if (filename == NULL){
457
perror("malloc");
458
exitstatus = EXIT_FAILURE;
459
goto end;
460
}
461
strcpy(filename, plugindir); /* Spurious warning */
462
strcat(filename, "/"); /* Spurious warning */
463
strcat(filename, dirst->d_name); /* Spurious warning */
764
464
765
465
ret = stat(filename, &st);
766
if(ret == -1){
466
if (ret == -1){
767
467
perror("stat");
768
free(filename);
769
continue;
468
exitstatus = EXIT_FAILURE;
469
goto end;
770
470
}
771
772
/* Ignore non-executable files */
773
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
471
472
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
774
473
if(debug){
775
474
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
776
475
" with bad type or mode\n", filename);
778
477
free(filename);
779
478
continue;
780
479
}
781
782
plugin *p = getplugin(dirst->d_name);
783
if(p == NULL){
784
perror("getplugin");
785
free(filename);
786
continue;
787
}
788
if(p->disabled){
480
if(getplugin(dirst->d_name, &plugin_list)->disabled){
789
481
if(debug){
790
482
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
791
483
dirst->d_name);
793
485
free(filename);
794
486
continue;
795
487
}
488
plugin *p = getplugin(dirst->d_name, &plugin_list);
796
489
{
797
490
/* Add global arguments to argument list for this plugin */
798
plugin *g = getplugin(NULL);
799
if(g != NULL){
800
for(char **a = g->argv + 1; *a != NULL; a++){
801
if(not add_argument(p, *a)){
802
perror("add_argument");
803
}
804
}
805
/* Add global environment variables */
806
for(char **e = g->environ; *e != NULL; e++){
807
if(not add_environment(p, *e, false)){
808
perror("add_environment");
809
}
810
}
811
}
812
}
813
/* If this plugin has any environment variables, we will call
814
using execve and need to duplicate the environment from this
815
process, too. */
816
if(p->environ[0] != NULL){
817
for(char **e = environ; *e != NULL; e++){
818
if(not add_environment(p, *e, false)){
819
perror("add_environment");
820
}
821
}
822
}
823
824
int pipefd[2];
491
plugin *g = getplugin(NULL, &plugin_list);
492
for(char **a = g->argv + 1; *a != NULL; a++){
493
addargument(p, *a);
494
}
495
}
496
int pipefd[2];
825
497
ret = pipe(pipefd);
826
if(ret == -1){
498
if (ret == -1){
827
499
perror("pipe");
828
500
exitstatus = EXIT_FAILURE;
829
goto fallback;
501
goto end;
830
502
}
831
/* Ask OS to automatic close the pipe on exec */
832
503
ret = set_cloexec_flag(pipefd[0]);
833
504
if(ret < 0){
834
505
perror("set_cloexec_flag");
835
506
exitstatus = EXIT_FAILURE;
836
goto fallback;
507
goto end;
837
508
}
838
509
ret = set_cloexec_flag(pipefd[1]);
839
510
if(ret < 0){
840
511
perror("set_cloexec_flag");
841
512
exitstatus = EXIT_FAILURE;
842
goto fallback;
513
goto end;
843
514
}
844
515
/* Block SIGCHLD until process is safely in process list */
845
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
516
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
846
517
if(ret < 0){
847
518
perror("sigprocmask");
848
519
exitstatus = EXIT_FAILURE;
849
goto fallback;
520
goto end;
850
521
}
851
/* Starting a new process to be watched */
522
// Starting a new process to be watched
852
523
pid_t pid = fork();
853
if(pid == -1){
854
perror("fork");
855
exitstatus = EXIT_FAILURE;
856
goto fallback;
857
}
858
524
if(pid == 0){
859
525
/* this is the child process */
860
526
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
862
528
perror("sigaction");
863
529
_exit(EXIT_FAILURE);
864
530
}
865
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
531
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
866
532
if(ret < 0){
867
533
perror("sigprocmask");
868
534
_exit(EXIT_FAILURE);
869
535
}
870
536
871
537
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
872
538
if(ret == -1){
873
539
perror("dup2");
879
545
above and must now close it manually here. */
880
546
closedir(dir);
881
547
}
882
if(p->environ[0] == NULL){
883
if(execv(filename, p->argv) < 0){
884
perror("execv");
885
_exit(EXIT_FAILURE);
886
}
887
} else {
888
if(execve(filename, p->argv, p->environ) < 0){
889
perror("execve");
890
_exit(EXIT_FAILURE);
891
}
548
if(execv(filename, p->argv) < 0){
549
perror("execv");
550
_exit(EXIT_FAILURE);
892
551
}
893
552
/* no return */
894
553
}
895
/* Parent process */
896
close(pipefd[1]); /* Close unused write end of pipe */
554
/* parent process */
897
555
free(filename);
898
plugin *new_plugin = getplugin(dirst->d_name);
899
if(new_plugin == NULL){
900
perror("getplugin");
901
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
556
close(pipefd[1]); /* close unused write end of pipe */
557
process *new_process = malloc(sizeof(process));
558
if (new_process == NULL){
559
perror("malloc");
560
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
902
561
if(ret < 0){
903
perror("sigprocmask");
562
perror("sigprocmask");
904
563
}
905
564
exitstatus = EXIT_FAILURE;
906
goto fallback;
565
goto end;
907
566
}
908
567
909
new_plugin->pid = pid;
910
new_plugin->fd = pipefd[0];
911
568
*new_process = (struct process){ .pid = pid,
569
.fd = pipefd[0],
570
.next = process_list };
571
// List handling
572
process_list = new_process;
912
573
/* Unblock SIGCHLD so signal handler can be run if this process
913
574
has already completed */
914
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
575
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
915
576
if(ret < 0){
916
577
perror("sigprocmask");
917
578
exitstatus = EXIT_FAILURE;
918
goto fallback;
919
}
920
921
FD_SET(new_plugin->fd, &rfds_all);
922
923
if(maxfd < new_plugin->fd){
924
maxfd = new_plugin->fd;
925
}
579
goto end;
580
}
581
582
FD_SET(new_process->fd, &rfds_all);
583
584
if (maxfd < new_process->fd){
585
maxfd = new_process->fd;
586
}
587
588
}
589
590
/* Free the plugin list */
591
for(plugin *next; plugin_list != NULL; plugin_list = next){
592
next = plugin_list->next;
593
free(plugin_list->argv);
594
free(plugin_list);
926
595
}
927
596
928
597
closedir(dir);
929
598
dir = NULL;
930
931
for(plugin *p = plugin_list; p != NULL; p = p->next){
932
if(p->pid != 0){
933
break;
934
}
935
if(p->next == NULL){
936
fprintf(stderr, "No plugin processes started. Incorrect plugin"
937
" directory?\n");
938
free_plugin_list();
939
}
599
600
if (process_list == NULL){
601
fprintf(stderr, "No plugin processes started. Incorrect plugin"
602
" directory?\n");
603
process_list = NULL;
940
604
}
941
942
/* Main loop while running plugins exist */
943
while(plugin_list){
605
while(process_list){
944
606
fd_set rfds = rfds_all;
945
607
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
946
if(select_ret == -1){
608
if (select_ret == -1){
947
609
perror("select");
948
610
exitstatus = EXIT_FAILURE;
949
goto fallback;
611
goto end;
950
612
}
951
613
/* OK, now either a process completed, or something can be read
952
614
from one of them */
953
for(plugin *proc = plugin_list; proc != NULL;){
615
for(process *proc = process_list; proc ; proc = proc->next){
954
616
/* Is this process completely done? */
955
617
if(proc->eof and proc->completed){
956
618
/* Only accept the plugin output if it exited cleanly */
957
619
if(not WIFEXITED(proc->status)
958
620
or WEXITSTATUS(proc->status) != 0){
959
621
/* Bad exit by plugin */
960
961
622
if(debug){
962
623
if(WIFEXITED(proc->status)){
963
624
fprintf(stderr, "Plugin %u exited with status %d\n",
968
629
(unsigned int) (proc->pid),
969
630
WTERMSIG(proc->status));
970
631
} else if(WCOREDUMP(proc->status)){
971
fprintf(stderr, "Plugin %u dumped core\n",
632
fprintf(stderr, "Plugin %d dumped core\n",
972
633
(unsigned int) (proc->pid));
973
634
}
974
635
}
975
976
636
/* Remove the plugin */
977
637
FD_CLR(proc->fd, &rfds_all);
978
979
638
/* Block signal while modifying process_list */
980
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
639
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
981
640
if(ret < 0){
982
641
perror("sigprocmask");
983
642
exitstatus = EXIT_FAILURE;
984
goto fallback;
985
}
986
987
plugin *next_plugin = proc->next;
988
free_plugin(proc);
989
proc = next_plugin;
990
643
goto end;
644
}
645
/* Delete this process entry from the list */
646
if(process_list == proc){
647
/* First one - simple */
648
process_list = proc->next;
649
} else {
650
/* Second one or later */
651
for(process *p = process_list; p != NULL; p = p->next){
652
if(p->next == proc){
653
p->next = proc->next;
654
break;
655
}
656
}
657
}
991
658
/* We are done modifying process list, so unblock signal */
992
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
993
NULL);
659
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
660
NULL);
994
661
if(ret < 0){
995
662
perror("sigprocmask");
996
exitstatus = EXIT_FAILURE;
997
goto fallback;
998
}
999
1000
if(plugin_list == NULL){
1001
break;
1002
}
1003
1004
continue;
663
}
664
free(proc->buffer);
665
free(proc);
666
/* We deleted this process from the list, so we can't go
667
proc->next. Therefore, start over from the beginning of
668
the process list */
669
break;
1005
670
}
1006
1007
671
/* This process exited nicely, so print its buffer */
1008
1009
bool bret = print_out_password(proc->buffer,
1010
proc->buffer_length);
672
673
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1011
674
if(not bret){
1012
675
perror("print_out_password");
1013
676
exitstatus = EXIT_FAILURE;
1014
677
}
1015
goto fallback;
678
goto end;
1016
679
}
1017
1018
680
/* This process has not completed. Does it have any output? */
1019
681
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1020
682
/* This process had nothing to say at this time */
1021
proc = proc->next;
1022
683
continue;
1023
684
}
1024
685
/* Before reading, make the process' data buffer large enough */
1025
686
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1026
687
proc->buffer = realloc(proc->buffer, proc->buffer_size
1027
688
+ (size_t) BUFFER_SIZE);
1028
if(proc->buffer == NULL){
689
if (proc->buffer == NULL){
1029
690
perror("malloc");
1030
691
exitstatus = EXIT_FAILURE;
1031
goto fallback;
692
goto end;
1032
693
}
1033
694
proc->buffer_size += BUFFER_SIZE;
1034
695
}
1035
696
/* Read from the process */
1036
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1037
BUFFER_SIZE);
1038
if(sret < 0){
697
ret = read(proc->fd, proc->buffer + proc->buffer_length,
698
BUFFER_SIZE);
699
if(ret < 0){
1039
700
/* Read error from this process; ignore the error */
1040
proc = proc->next;
1041
701
continue;
1042
702
}
1043
if(sret == 0){
703
if(ret == 0){
1044
704
/* got EOF */
1045
705
proc->eof = true;
1046
706
} else {
1047
proc->buffer_length += (size_t) sret;
707
proc->buffer_length += (size_t) ret;
1048
708
}
1049
709
}
1050
710
}
1051
1052
1053
fallback:
1054
711
1055
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1056
/* Fallback if all plugins failed, none are found or an error
1057
occured */
712
if(process_list == NULL){
1058
713
bool bret;
1059
714
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1060
715
char *passwordbuffer = getpass("Password: ");
1061
size_t len = strlen(passwordbuffer);
1062
/* Strip trailing newline */
1063
if(len > 0 and passwordbuffer[len-1] == '\n'){
1064
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1065
len--;
1066
}
1067
bret = print_out_password(passwordbuffer, len);
716
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1068
717
if(not bret){
1069
718
perror("print_out_password");
1070
719
exitstatus = EXIT_FAILURE;
720
goto end;
1071
721
}
1072
722
}
723
724
end:
1073
725
1074
726
/* Restore old signal handler */
1075
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1076
if(ret == -1){
1077
perror("sigaction");
1078
exitstatus = EXIT_FAILURE;
1079
}
1080
1081
if(custom_argv != NULL){
1082
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1083
free(*arg);
1084
}
1085
free(custom_argv);
727
sigaction(SIGCHLD, &old_sigchld_action, NULL);
728
729
free(plus_argv);
730
731
/* Free the plugin list */
732
for(plugin *next; plugin_list != NULL; plugin_list = next){
733
next = plugin_list->next;
734
free(plugin_list->argv);
735
free(plugin_list);
1086
736
}
1087
737
1088
738
if(dir != NULL){
1089
739
closedir(dir);
1090
740
}
1091
741
1092
/* Kill the processes */
1093
for(plugin *p = plugin_list; p != NULL; p = p->next){
1094
if(p->pid != 0){
1095
close(p->fd);
1096
ret = kill(p->pid, SIGTERM);
1097
if(ret == -1 and errno != ESRCH){
1098
/* Set-uid proccesses might not get closed */
1099
perror("kill");
1100
}
742
/* Free the process list and kill the processes */
743
for(process *next; process_list != NULL; process_list = next){
744
next = process_list->next;
745
close(process_list->fd);
746
ret = kill(process_list->pid, SIGTERM);
747
if(ret == -1 and errno != ESRCH){
748
/* set-uid proccesses migth not get closed */
749
perror("kill");
1101
750
}
751
free(process_list->buffer);
752
free(process_list);
1102
753
}
1103
754
1104
755
/* Wait for any remaining child processes to terminate */
1109
760
perror("wait");
1110
761
}
1111
762
1112
free_plugin_list();
1113
1114
free(plugindir);
1115
free(argfile);
1116
1117
763
return exitstatus;
1118
764
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0