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- Committer: Teddy Hogeborn
- Date: 2009-01-15 04:55:10 UTC
- mto: (24.1.170 mandos) (237.4.29 release)
- mto: This revision was merged to the branch mainline in revision 271.
- Revision ID: teddy@fukt.bsnet.se-20090115045510-wkqpp1ta8q9zcz7p
Tags: version-1.0.4-1
* debian/changelog (1.0.4-1): New entry.
* NEWS (1.0.4): - '' -
* NEWS (1.0.4): - '' -
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
21
22
* Contact the authors at <mandos@fukt.bsnet.se>.
22
23
*/
23
24
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
26
27
#include <stddef.h> /* size_t, NULL */
27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
32
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
46
47
fcntl(), setuid(), setgid(),
47
48
F_GETFD, F_SETFD, FD_CLOEXEC,
48
49
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
dup2(), STDOUT_FILENO, _exit(),
50
51
execv(), write(), read(),
51
52
close() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
54
FD_CLOEXEC */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
55
#include <string.h> /* strsep, strlen(), asprintf() */
56
56
#include <errno.h> /* errno */
57
57
#include <argp.h> /* struct argp_option, struct
58
58
argp_state, struct argp,
59
59
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
61
62
#include <signal.h> /* struct sigaction, sigemptyset(),
62
63
sigaddset(), sigaction(),
63
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
65
SIG_UNBLOCK, kill() */
65
66
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
66
68
67
69
#define BUFFER_SIZE 256
68
70
69
const char *argp_program_version = "mandos-client 1.0";
71
#define PDIR "/lib/mandos/plugins.d"
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
74
const char *argp_program_version = "plugin-runner " VERSION;
70
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
76
72
struct process;
77
typedef struct plugin{
78
char *name; /* can be NULL or any plugin name */
79
char **argv;
80
int argc;
81
char **environ;
82
int envc;
83
bool disabled;
73
84
74
typedef struct process{
85
/* Variables used for running processes*/
75
86
pid_t pid;
76
87
int fd;
77
88
char *buffer;
78
89
size_t buffer_size;
79
90
size_t buffer_length;
80
91
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
bool disabled;
92
volatile bool completed;
93
volatile int status;
91
94
struct plugin *next;
92
95
} plugin;
93
96
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
if ((p->name == name)
97
or (p->name and name and (strcmp(p->name, name) == 0))){
97
static plugin *plugin_list = NULL;
98
99
/* Gets an existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
if((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
98
106
return p;
99
107
}
100
108
}
101
109
/* Create a new plugin */
102
110
plugin *new_plugin = malloc(sizeof(plugin));
103
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
111
if(new_plugin == NULL){
112
return NULL;
113
}
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
return NULL;
119
}
120
}
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
108
127
new_plugin->argv = malloc(sizeof(char *) * 2);
109
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
128
if(new_plugin->argv == NULL){
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
112
132
}
113
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
114
134
new_plugin->argv[1] = NULL;
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
135
136
new_plugin->environ = malloc(sizeof(char *));
137
if(new_plugin->environ == NULL){
138
free(copy_name);
139
free(new_plugin->argv);
140
free(new_plugin);
141
return NULL;
142
}
143
new_plugin->environ[0] = NULL;
144
118
145
/* Append the new plugin to the list */
119
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
120
147
return new_plugin;
121
148
}
122
149
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;
150
/* Helper function for add_argument and add_environment */
151
static bool add_to_char_array(const char *new, char ***array,
152
int *len){
153
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
156
/* Malloc check */
157
if(*array == NULL){
158
return false;
159
}
160
/* Make a copy of the new string */
161
char *copy = strdup(new);
162
if(copy == NULL){
163
return false;
164
}
165
/* Insert the copy */
166
(*array)[*len] = copy;
167
(*len)++;
168
/* Add a new terminating NULL pointer to the last element */
169
(*array)[*len] = NULL;
170
return true;
171
}
172
173
/* Add to a plugin's argument vector */
174
static bool add_argument(plugin *p, const char *arg){
175
if(p == NULL){
176
return false;
177
}
178
return add_to_char_array(arg, &(p->argv), &(p->argc));
179
}
180
181
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
183
if(p == NULL){
184
return false;
185
}
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
191
/* It already exists */
192
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
195
return false;
196
}
197
*e = new;
198
strcpy(*e, def);
199
}
200
return true;
201
}
202
}
203
return add_to_char_array(def, &(p->environ), &(p->envc));
132
204
}
133
205
134
206
/*
136
208
* Descriptor Flags".
137
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
138
210
*/
139
static int set_cloexec_flag(int fd)
140
{
211
static int set_cloexec_flag(int fd){
141
212
int ret = fcntl(fd, F_GETFD, 0);
142
213
/* If reading the flags failed, return error indication now. */
143
214
if(ret < 0){
147
218
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
148
219
}
149
220
150
process *process_list = NULL;
151
221
152
/* Mark a process as completed when it exits, and save its exit
222
/* Mark processes as completed when they exit, and save their exit
153
223
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;
224
static void handle_sigchld(__attribute__((unused)) int sig){
225
while(true){
226
plugin *proc = plugin_list;
227
int status;
228
pid_t pid = waitpid(-1, &status, WNOHANG);
229
if(pid == 0){
230
/* Only still running child processes */
231
break;
232
}
233
if(pid == -1){
234
if(errno != ECHILD){
235
perror("waitpid");
236
}
237
/* No child processes */
238
break;
239
}
240
241
/* A child exited, find it in process_list */
242
while(proc != NULL and proc->pid != pid){
243
proc = proc->next;
244
}
245
if(proc == NULL){
246
/* Process not found in process list */
247
continue;
248
}
249
proc->status = status;
250
proc->completed = true;
251
}
171
252
}
172
253
173
bool print_out_password(const char *buffer, size_t length){
254
/* Prints out a password to stdout */
255
static bool print_out_password(const char *buffer, size_t length){
174
256
ssize_t ret;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
178
257
for(size_t written = 0; written < length; written += (size_t)ret){
179
258
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
180
259
length - written));
185
264
return true;
186
265
}
187
266
267
/* Removes and free a plugin from the plugin list */
268
static void free_plugin(plugin *plugin_node){
269
270
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
271
free(*arg);
272
}
273
free(plugin_node->argv);
274
for(char **env = plugin_node->environ; *env != NULL; env++){
275
free(*env);
276
}
277
free(plugin_node->environ);
278
free(plugin_node->buffer);
279
280
/* Removes the plugin from the singly-linked list */
281
if(plugin_node == plugin_list){
282
/* First one - simple */
283
plugin_list = plugin_list->next;
284
} else {
285
/* Second one or later */
286
for(plugin *p = plugin_list; p != NULL; p = p->next){
287
if(p->next == plugin_node){
288
p->next = plugin_node->next;
289
break;
290
}
291
}
292
}
293
294
free(plugin_node);
295
}
296
297
static void free_plugin_list(void){
298
while(plugin_list != NULL){
299
free_plugin(plugin_list);
300
}
301
}
302
188
303
int main(int argc, char *argv[]){
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
304
char *plugindir = NULL;
305
char *argfile = NULL;
306
FILE *conffp;
190
307
size_t d_name_len;
191
308
DIR *dir = NULL;
192
309
struct dirent *dirst;
193
310
struct stat st;
194
311
fd_set rfds_all;
195
int ret, maxfd = 0;
312
int ret, numchars, maxfd = 0;
313
ssize_t sret;
314
intmax_t tmpmax;
196
315
uid_t uid = 65534;
197
316
gid_t gid = 65534;
198
317
bool debug = false;
200
319
struct sigaction old_sigchld_action;
201
320
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
202
321
.sa_flags = SA_NOCLDSTOP };
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
322
char **custom_argv = NULL;
323
int custom_argc = 0;
324
206
325
/* Establish a signal handler */
207
326
sigemptyset(&sigchld_action.sa_mask);
208
327
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
209
if(ret < 0){
328
if(ret == -1){
210
329
perror("sigaddset");
211
exit(EXIT_FAILURE);
330
exitstatus = EXIT_FAILURE;
331
goto fallback;
212
332
}
213
333
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
214
if(ret < 0){
334
if(ret == -1){
215
335
perror("sigaction");
216
exit(EXIT_FAILURE);
336
exitstatus = EXIT_FAILURE;
337
goto fallback;
217
338
}
218
339
219
340
/* The options we understand. */
221
342
{ .name = "global-options", .key = 'g',
222
343
.arg = "OPTION[,OPTION[,...]]",
223
344
.doc = "Options passed to all plugins" },
345
{ .name = "global-env", .key = 'G',
346
.arg = "VAR=value",
347
.doc = "Environment variable passed to all plugins" },
224
348
{ .name = "options-for", .key = 'o',
225
349
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
226
350
.doc = "Options passed only to specified plugin" },
351
{ .name = "env-for", .key = 'E',
352
.arg = "PLUGIN:ENV=value",
353
.doc = "Environment variable passed to specified plugin" },
227
354
{ .name = "disable", .key = 'd',
228
355
.arg = "PLUGIN",
229
356
.doc = "Disable a specific plugin", .group = 1 },
357
{ .name = "enable", .key = 'e',
358
.arg = "PLUGIN",
359
.doc = "Enable a specific plugin", .group = 1 },
230
360
{ .name = "plugin-dir", .key = 128,
231
361
.arg = "DIRECTORY",
232
362
.doc = "Specify a different plugin directory", .group = 2 },
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 },
363
{ .name = "config-file", .key = 129,
364
.arg = "FILE",
365
.doc = "Specify a different configuration file", .group = 2 },
366
{ .name = "userid", .key = 130,
367
.arg = "ID", .flags = 0,
368
.doc = "User ID the plugins will run as", .group = 3 },
369
{ .name = "groupid", .key = 131,
370
.arg = "ID", .flags = 0,
371
.doc = "Group ID the plugins will run as", .group = 3 },
372
{ .name = "debug", .key = 132,
373
.doc = "Debug mode", .group = 4 },
241
374
{ .name = NULL }
242
375
};
243
376
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:
377
error_t parse_opt(int key, char *arg, __attribute__((unused))
378
struct argp_state *state) {
379
switch(key) {
380
case 'g': /* --global-options */
381
if(arg != NULL){
382
char *p;
383
while((p = strsep(&arg, ",")) != NULL){
384
if(p[0] == '\0'){
385
continue;
386
}
387
if(not add_argument(getplugin(NULL), p)){
388
perror("add_argument");
389
return ARGP_ERR_UNKNOWN;
390
}
391
}
392
}
393
break;
394
case 'G': /* --global-env */
395
if(arg == NULL){
396
break;
397
}
398
if(not add_environment(getplugin(NULL), arg, true)){
399
perror("add_environment");
400
}
401
break;
402
case 'o': /* --options-for */
403
if(arg != NULL){
404
char *p_name = strsep(&arg, ":");
405
if(p_name[0] == '\0' or arg == NULL){
406
break;
407
}
408
char *opt = strsep(&arg, ":");
409
if(opt[0] == '\0' or opt == NULL){
410
break;
411
}
412
char *p;
413
while((p = strsep(&opt, ",")) != NULL){
414
if(p[0] == '\0'){
415
continue;
416
}
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
420
}
421
}
422
}
423
break;
424
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
428
{
429
char *envdef = strchr(arg, ':');
430
if(envdef == NULL){
431
break;
432
}
433
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
436
}
437
}
438
break;
439
case 'd': /* --disable */
440
if(arg != NULL){
441
plugin *p = getplugin(arg);
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
444
}
445
p->disabled = true;
446
}
447
break;
448
case 'e': /* --enable */
449
if(arg != NULL){
450
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
453
}
454
p->disabled = false;
455
}
456
break;
457
case 128: /* --plugin-dir */
458
free(plugindir);
459
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
463
break;
464
case 129: /* --config-file */
465
/* This is already done by parse_opt_config_file() */
466
break;
467
case 130: /* --userid */
468
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
469
if(ret < 1 or tmpmax != (uid_t)tmpmax
470
or arg[numchars] != '\0'){
471
fprintf(stderr, "Bad user ID number: \"%s\", using %"
472
PRIdMAX "\n", arg, (intmax_t)uid);
473
} else {
474
uid = (uid_t)tmpmax;
475
}
476
break;
477
case 131: /* --groupid */
478
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
479
if(ret < 1 or tmpmax != (gid_t)tmpmax
480
or arg[numchars] != '\0'){
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 */
286
488
debug = true;
287
489
break;
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]",
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 = "",
306
546
.doc = "Mandos plugin runner -- Run plugins" };
307
547
308
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
309
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){
310
552
fprintf(stderr, "Unknown error while parsing arguments\n");
311
553
exitstatus = EXIT_FAILURE;
312
goto end;
554
goto fallback;
313
555
}
314
556
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){
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){
325
576
perror("malloc");
326
577
exitstatus = EXIT_FAILURE;
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){
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){
347
634
fprintf(stderr, "Unknown error while parsing arguments\n");
348
635
exitstatus = EXIT_FAILURE;
349
goto end;
636
goto fallback;
350
637
}
351
638
}
352
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
353
649
if(debug){
354
650
for(plugin *p = plugin_list; p != NULL; p=p->next){
355
651
fprintf(stderr, "Plugin: %s has %d arguments\n",
357
653
for(char **a = p->argv; *a != NULL; a++){
358
654
fprintf(stderr, "\tArg: %s\n", *a);
359
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
}
360
660
}
361
661
}
362
662
663
/* Strip permissions down to nobody */
363
664
ret = setuid(uid);
364
if (ret == -1){
665
if(ret == -1){
365
666
perror("setuid");
366
}
367
667
}
368
668
setgid(gid);
369
if (ret == -1){
669
if(ret == -1){
370
670
perror("setgid");
371
671
}
372
672
373
dir = opendir(plugindir);
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
677
}
678
374
679
if(dir == NULL){
375
680
perror("Could not open plugin dir");
376
681
exitstatus = EXIT_FAILURE;
377
goto end;
682
goto fallback;
378
683
}
379
684
380
685
/* Set the FD_CLOEXEC flag on the directory, if possible */
385
690
if(ret < 0){
386
691
perror("set_cloexec_flag");
387
692
exitstatus = EXIT_FAILURE;
388
goto end;
693
goto fallback;
389
694
}
390
695
}
391
696
}
392
697
393
698
FD_ZERO(&rfds_all);
394
699
700
/* Read and execute any executable in the plugin directory*/
395
701
while(true){
396
702
dirst = readdir(dir);
397
703
398
// All directory entries have been processed
704
/* All directory entries have been processed */
399
705
if(dirst == NULL){
400
if (errno == EBADF){
706
if(errno == EBADF){
401
707
perror("readdir");
402
708
exitstatus = EXIT_FAILURE;
403
goto end;
709
goto fallback;
404
710
}
405
711
break;
406
712
}
407
713
408
714
d_name_len = strlen(dirst->d_name);
409
715
410
// Ignore dotfiles, backup files and other junk
716
/* Ignore dotfiles, backup files and other junk */
411
717
{
412
718
bool bad_name = false;
413
719
415
721
416
722
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
417
723
".dpkg-old",
724
".dpkg-bak",
418
725
".dpkg-divert", NULL };
419
726
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
420
727
size_t pre_len = strlen(*pre);
428
735
break;
429
736
}
430
737
}
431
432
738
if(bad_name){
433
739
continue;
434
740
}
435
436
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
437
742
size_t suf_len = strlen(*suf);
438
743
if((d_name_len >= suf_len)
451
756
continue;
452
757
}
453
758
}
454
455
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
456
if (filename == NULL){
457
perror("malloc");
759
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");
458
768
continue;
459
769
}
460
strcpy(filename, plugindir); /* Spurious warning */
461
strcat(filename, "/"); /* Spurious warning */
462
strcat(filename, dirst->d_name); /* Spurious warning */
463
770
464
771
ret = stat(filename, &st);
465
if (ret == -1){
772
if(ret == -1){
466
773
perror("stat");
467
774
free(filename);
468
775
continue;
469
776
}
470
471
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
777
778
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
472
780
if(debug){
473
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
474
782
" with bad type or mode\n", filename);
476
784
free(filename);
477
785
continue;
478
786
}
479
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){
480
795
if(debug){
481
796
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
482
797
dirst->d_name);
484
799
free(filename);
485
800
continue;
486
801
}
487
plugin *p = getplugin(dirst->d_name, &plugin_list);
488
802
{
489
803
/* Add global arguments to argument list for this plugin */
490
plugin *g = getplugin(NULL, &plugin_list);
491
for(char **a = g->argv + 1; *a != NULL; a++){
492
addargument(p, *a);
493
}
494
}
495
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];
496
831
ret = pipe(pipefd);
497
if (ret == -1){
832
if(ret == -1){
498
833
perror("pipe");
499
834
exitstatus = EXIT_FAILURE;
500
goto end;
835
goto fallback;
501
836
}
837
/* Ask OS to automatic close the pipe on exec */
502
838
ret = set_cloexec_flag(pipefd[0]);
503
839
if(ret < 0){
504
840
perror("set_cloexec_flag");
505
841
exitstatus = EXIT_FAILURE;
506
goto end;
842
goto fallback;
507
843
}
508
844
ret = set_cloexec_flag(pipefd[1]);
509
845
if(ret < 0){
510
846
perror("set_cloexec_flag");
511
847
exitstatus = EXIT_FAILURE;
512
goto end;
848
goto fallback;
513
849
}
514
850
/* Block SIGCHLD until process is safely in process list */
515
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
516
852
if(ret < 0){
517
853
perror("sigprocmask");
518
854
exitstatus = EXIT_FAILURE;
519
goto end;
855
goto fallback;
520
856
}
521
// Starting a new process to be watched
857
/* Starting a new process to be watched */
522
858
pid_t pid = fork();
523
859
if(pid == -1){
524
860
perror("fork");
525
861
exitstatus = EXIT_FAILURE;
526
goto end;
862
goto fallback;
527
863
}
528
864
if(pid == 0){
529
865
/* this is the child process */
532
868
perror("sigaction");
533
869
_exit(EXIT_FAILURE);
534
870
}
535
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
536
872
if(ret < 0){
537
873
perror("sigprocmask");
538
874
_exit(EXIT_FAILURE);
539
875
}
540
876
541
877
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
542
878
if(ret == -1){
543
879
perror("dup2");
549
885
above and must now close it manually here. */
550
886
closedir(dir);
551
887
}
552
if(execv(filename, p->argv) < 0){
553
perror("execv");
554
_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
}
555
898
}
556
899
/* no return */
557
900
}
558
/* parent process */
901
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
559
903
free(filename);
560
close(pipefd[1]); /* close unused write end of pipe */
561
process *new_process = malloc(sizeof(process));
562
if (new_process == NULL){
563
perror("malloc");
564
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);
565
908
if(ret < 0){
566
perror("sigprocmask");
909
perror("sigprocmask");
567
910
}
568
911
exitstatus = EXIT_FAILURE;
569
goto end;
912
goto fallback;
570
913
}
571
914
572
*new_process = (struct process){ .pid = pid,
573
.fd = pipefd[0],
574
.next = process_list };
575
// List handling
576
process_list = new_process;
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
917
577
918
/* Unblock SIGCHLD so signal handler can be run if this process
578
919
has already completed */
579
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
580
921
if(ret < 0){
581
922
perror("sigprocmask");
582
923
exitstatus = EXIT_FAILURE;
583
goto end;
584
}
585
586
FD_SET(new_process->fd, &rfds_all);
587
588
if (maxfd < new_process->fd){
589
maxfd = new_process->fd;
590
}
591
592
}
593
594
/* Free the plugin list */
595
for(plugin *next; plugin_list != NULL; plugin_list = next){
596
next = plugin_list->next;
597
free(plugin_list->argv);
598
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
}
599
932
}
600
933
601
934
closedir(dir);
602
935
dir = NULL;
603
604
if (process_list == NULL){
605
fprintf(stderr, "No plugin processes started. Incorrect plugin"
606
" directory?\n");
607
process_list = NULL;
936
937
for(plugin *p = plugin_list; p != NULL; p = p->next){
938
if(p->pid != 0){
939
break;
940
}
941
if(p->next == NULL){
942
fprintf(stderr, "No plugin processes started. Incorrect plugin"
943
" directory?\n");
944
free_plugin_list();
945
}
608
946
}
609
while(process_list){
947
948
/* Main loop while running plugins exist */
949
while(plugin_list){
610
950
fd_set rfds = rfds_all;
611
951
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
612
if (select_ret == -1){
952
if(select_ret == -1){
613
953
perror("select");
614
954
exitstatus = EXIT_FAILURE;
615
goto end;
955
goto fallback;
616
956
}
617
957
/* OK, now either a process completed, or something can be read
618
958
from one of them */
619
for(process *proc = process_list; proc ; proc = proc->next){
959
for(plugin *proc = plugin_list; proc != NULL;){
620
960
/* Is this process completely done? */
621
961
if(proc->eof and proc->completed){
622
962
/* Only accept the plugin output if it exited cleanly */
623
963
if(not WIFEXITED(proc->status)
624
964
or WEXITSTATUS(proc->status) != 0){
625
965
/* Bad exit by plugin */
966
626
967
if(debug){
627
968
if(WIFEXITED(proc->status)){
628
fprintf(stderr, "Plugin %u exited with status %d\n",
629
(unsigned int) (proc->pid),
969
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
970
" %d\n", (intmax_t) (proc->pid),
630
971
WEXITSTATUS(proc->status));
631
972
} else if(WIFSIGNALED(proc->status)) {
632
fprintf(stderr, "Plugin %u killed by signal %d\n",
633
(unsigned int) (proc->pid),
973
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
974
" %d\n", (intmax_t) (proc->pid),
634
975
WTERMSIG(proc->status));
635
976
} else if(WCOREDUMP(proc->status)){
636
fprintf(stderr, "Plugin %d dumped core\n",
637
(unsigned int) (proc->pid));
977
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
978
(intmax_t) (proc->pid));
638
979
}
639
980
}
981
640
982
/* Remove the plugin */
641
983
FD_CLR(proc->fd, &rfds_all);
984
642
985
/* Block signal while modifying process_list */
643
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
644
987
if(ret < 0){
645
988
perror("sigprocmask");
646
989
exitstatus = EXIT_FAILURE;
647
goto end;
648
}
649
/* Delete this process entry from the list */
650
if(process_list == proc){
651
/* First one - simple */
652
process_list = proc->next;
653
} else {
654
/* Second one or later */
655
for(process *p = process_list; p != NULL; p = p->next){
656
if(p->next == proc){
657
p->next = proc->next;
658
break;
659
}
660
}
661
}
990
goto fallback;
991
}
992
993
plugin *next_plugin = proc->next;
994
free_plugin(proc);
995
proc = next_plugin;
996
662
997
/* We are done modifying process list, so unblock signal */
663
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
664
NULL);
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
665
1000
if(ret < 0){
666
1001
perror("sigprocmask");
667
}
668
free(proc->buffer);
669
free(proc);
670
/* We deleted this process from the list, so we can't go
671
proc->next. Therefore, start over from the beginning of
672
the process list */
673
break;
1002
exitstatus = EXIT_FAILURE;
1003
goto fallback;
1004
}
1005
1006
if(plugin_list == NULL){
1007
break;
1008
}
1009
1010
continue;
674
1011
}
1012
675
1013
/* This process exited nicely, so print its buffer */
676
677
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1014
1015
bool bret = print_out_password(proc->buffer,
1016
proc->buffer_length);
678
1017
if(not bret){
679
1018
perror("print_out_password");
680
1019
exitstatus = EXIT_FAILURE;
681
1020
}
682
goto end;
1021
goto fallback;
683
1022
}
1023
684
1024
/* This process has not completed. Does it have any output? */
685
1025
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
686
1026
/* This process had nothing to say at this time */
1027
proc = proc->next;
687
1028
continue;
688
1029
}
689
1030
/* Before reading, make the process' data buffer large enough */
690
1031
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
691
1032
proc->buffer = realloc(proc->buffer, proc->buffer_size
692
1033
+ (size_t) BUFFER_SIZE);
693
if (proc->buffer == NULL){
1034
if(proc->buffer == NULL){
694
1035
perror("malloc");
695
1036
exitstatus = EXIT_FAILURE;
696
goto end;
1037
goto fallback;
697
1038
}
698
1039
proc->buffer_size += BUFFER_SIZE;
699
1040
}
700
1041
/* Read from the process */
701
ret = read(proc->fd, proc->buffer + proc->buffer_length,
702
BUFFER_SIZE);
703
if(ret < 0){
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1044
if(sret < 0){
704
1045
/* Read error from this process; ignore the error */
1046
proc = proc->next;
705
1047
continue;
706
1048
}
707
if(ret == 0){
1049
if(sret == 0){
708
1050
/* got EOF */
709
1051
proc->eof = true;
710
1052
} else {
711
proc->buffer_length += (size_t) ret;
1053
proc->buffer_length += (size_t) sret;
712
1054
}
713
1055
}
714
1056
}
715
1057
716
1058
717
end:
1059
fallback:
718
1060
719
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
720
/* Fallback if all plugins failed, none are found or an error occured */
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1062
/* Fallback if all plugins failed, none are found or an error
1063
occured */
721
1064
bool bret;
722
1065
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
723
1066
char *passwordbuffer = getpass("Password: ");
724
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1067
size_t len = strlen(passwordbuffer);
1068
/* Strip trailing newline */
1069
if(len > 0 and passwordbuffer[len-1] == '\n'){
1070
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1071
len--;
1072
}
1073
bret = print_out_password(passwordbuffer, len);
725
1074
if(not bret){
726
1075
perror("print_out_password");
727
1076
exitstatus = EXIT_FAILURE;
728
goto end;
729
1077
}
730
1078
}
731
1079
732
1080
/* Restore old signal handler */
733
sigaction(SIGCHLD, &old_sigchld_action, NULL);
734
735
free(plus_argv);
736
737
/* Free the plugin list */
738
for(plugin *next; plugin_list != NULL; plugin_list = next){
739
next = plugin_list->next;
740
free(plugin_list->argv);
741
free(plugin_list);
1081
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1082
if(ret == -1){
1083
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1085
}
1086
1087
if(custom_argv != NULL){
1088
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1089
free(*arg);
1090
}
1091
free(custom_argv);
742
1092
}
743
1093
744
1094
if(dir != NULL){
745
1095
closedir(dir);
746
1096
}
747
1097
748
/* Free the process list and kill the processes */
749
for(process *next; process_list != NULL; process_list = next){
750
next = process_list->next;
751
close(process_list->fd);
752
ret = kill(process_list->pid, SIGTERM);
753
if(ret == -1 and errno != ESRCH){
754
/* set-uid proccesses migth not get closed */
755
perror("kill");
1098
/* Kill the processes */
1099
for(plugin *p = plugin_list; p != NULL; p = p->next){
1100
if(p->pid != 0){
1101
close(p->fd);
1102
ret = kill(p->pid, SIGTERM);
1103
if(ret == -1 and errno != ESRCH){
1104
/* Set-uid proccesses might not get closed */
1105
perror("kill");
1106
}
756
1107
}
757
free(process_list->buffer);
758
free(process_list);
759
1108
}
760
1109
761
1110
/* Wait for any remaining child processes to terminate */
766
1115
perror("wait");
767
1116
}
768
1117
1118
free_plugin_list();
1119
1120
free(plugindir);
1121
free(argfile);
1122
769
1123
return exitstatus;
770
1124
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0