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- Committer: Teddy Hogeborn
- Date: 2008-08-04 23:38:26 UTC
- mfrom: (24.1.20 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080804233826-idy7v8x36llseue0
* network-protocol.txt: New.
* server.py (daemon): Do the double fork thing.
* server.py (daemon): Do the double fork thing.
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugbasedclient.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() */
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
32
27
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS() */
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
28
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir(), stat(),
30
struct stat, waitpid(),
31
WIFEXITED(), WEXITSTATUS(),
32
wait() */
33
#include <sys/wait.h> /* wait() */
44
34
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
readdir(), closedir(), dirfd() */
35
readdir(), closedir() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
46
37
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
fcntl(), setuid(), setgid(),
48
F_GETFD, F_SETFD, FD_CLOEXEC,
49
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
51
execv(), write(), read(),
52
close() */
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
38
fcntl() */
39
#include <fcntl.h> /* fcntl() */
40
#include <stddef.h> /* NULL */
41
#include <stdlib.h> /* EXIT_FAILURE */
42
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
43
FD_SET(), FD_ISSET() */
44
#include <string.h> /* strlen(), strcpy(), strcat() */
45
#include <stdbool.h> /* true */
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
47
WEXITSTATUS() */
56
48
#include <errno.h> /* errno */
57
#include <argp.h> /* struct argp_option, struct
58
argp_state, struct argp,
59
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
62
#include <signal.h> /* struct sigaction, sigemptyset(),
63
sigaddset(), sigaction(),
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
67
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
69
52
70
53
#define BUFFER_SIZE 256
71
54
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;
76
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
77
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*/
55
struct process;
56
57
typedef struct process{
87
58
pid_t pid;
88
59
int fd;
89
60
char *buffer;
90
61
size_t buffer_size;
91
62
size_t buffer_length;
92
63
bool eof;
93
volatile sig_atomic_t completed;
64
bool completed;
94
65
int status;
66
struct process *next;
67
} process;
68
69
typedef struct plugin{
70
char *name; /* can be NULL or any plugin name */
71
char **argv;
72
int argc;
73
bool disabled;
95
74
struct plugin *next;
96
75
} plugin;
97
76
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))){
77
static plugin *getplugin(char *name, plugin **plugin_list){
78
for (plugin *p = *plugin_list; p != NULL; p = p->next){
79
if ((p->name == name)
80
or (p->name and name and (strcmp(p->name, name) == 0))){
107
81
return p;
108
82
}
109
83
}
110
84
/* Create a new plugin */
111
85
plugin *new_plugin = malloc(sizeof(plugin));
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
86
if (new_plugin == NULL){
87
perror("malloc");
88
exit(EXIT_FAILURE);
89
}
90
new_plugin->name = name;
129
91
new_plugin->argv = malloc(sizeof(char *) * 2);
130
if(new_plugin->argv == NULL){
131
free(copy_name);
132
free(new_plugin);
133
return NULL;
92
if (new_plugin->argv == NULL){
93
perror("malloc");
94
exit(EXIT_FAILURE);
134
95
}
135
new_plugin->argv[0] = copy_name;
96
new_plugin->argv[0] = name;
136
97
new_plugin->argv[1] = NULL;
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
98
new_plugin->argc = 1;
99
new_plugin->disabled = false;
100
new_plugin->next = *plugin_list;
147
101
/* Append the new plugin to the list */
148
plugin_list = new_plugin;
102
*plugin_list = new_plugin;
149
103
return new_plugin;
150
104
}
151
105
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));
106
static void addargument(plugin *p, char *arg){
107
p->argv[p->argc] = arg;
108
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
109
if (p->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
112
}
113
p->argc++;
114
p->argv[p->argc] = NULL;
206
115
}
207
116
208
117
/*
210
119
* Descriptor Flags".
211
120
* *Note File Descriptor Flags:(libc)Descriptor Flags.
212
121
*/
213
static int set_cloexec_flag(int fd){
122
static int set_cloexec_flag(int fd)
123
{
214
124
int ret = fcntl(fd, F_GETFD, 0);
215
125
/* If reading the flags failed, return error indication now. */
216
126
if(ret < 0){
220
130
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
221
131
}
222
132
223
224
/* Mark processes as completed when they exit, and save their exit
133
const char *argp_program_version = "plugbasedclient 0.9";
134
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
135
136
process *process_list = NULL;
137
138
/* Mark a process as completed when it exits, and save its exit
225
139
status. */
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;
256
}
257
258
/* Prints out a password to stdout */
259
static bool print_out_password(const char *buffer, size_t length){
260
ssize_t ret;
261
for(size_t written = 0; written < length; written += (size_t)ret){
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
length - written));
264
if(ret < 0){
265
return false;
266
}
267
}
268
return true;
269
}
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
}
140
void handle_sigchld(__attribute__((unused)) int sig){
141
process *proc = process_list;
142
int status;
143
pid_t pid = wait(&status);
144
while(proc != NULL and proc->pid != pid){
145
proc = proc->next;
146
}
147
if(proc == NULL){
148
/* Process not found in process list */
149
return;
150
}
151
proc->status = status;
152
proc->completed = true;
305
153
}
306
154
307
155
int main(int argc, char *argv[]){
308
char *plugindir = NULL;
309
char *argfile = NULL;
310
FILE *conffp;
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
311
157
size_t d_name_len;
312
158
DIR *dir = NULL;
313
159
struct dirent *dirst;
314
160
struct stat st;
315
161
fd_set rfds_all;
316
int ret, numchars, maxfd = 0;
317
ssize_t sret;
318
intmax_t tmpmax;
162
int ret, maxfd = 0;
319
163
uid_t uid = 65534;
320
164
gid_t gid = 65534;
321
165
bool debug = false;
323
167
struct sigaction old_sigchld_action;
324
168
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
325
169
.sa_flags = SA_NOCLDSTOP };
326
char **custom_argv = NULL;
327
int custom_argc = 0;
170
char *plus_options = NULL;
171
char **plus_argv = NULL;
328
172
329
173
/* Establish a signal handler */
330
174
sigemptyset(&sigchld_action.sa_mask);
331
175
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
332
if(ret == -1){
176
if(ret < 0){
333
177
perror("sigaddset");
334
exitstatus = EXIT_FAILURE;
335
goto fallback;
178
exit(EXIT_FAILURE);
336
179
}
337
180
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
338
if(ret == -1){
181
if(ret < 0){
339
182
perror("sigaction");
340
exitstatus = EXIT_FAILURE;
341
goto fallback;
183
exit(EXIT_FAILURE);
342
184
}
343
185
344
186
/* The options we understand. */
346
188
{ .name = "global-options", .key = 'g',
347
189
.arg = "OPTION[,OPTION[,...]]",
348
190
.doc = "Options passed to all plugins" },
349
{ .name = "global-env", .key = 'G',
350
.arg = "VAR=value",
351
.doc = "Environment variable passed to all plugins" },
352
191
{ .name = "options-for", .key = 'o',
353
192
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
354
193
.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" },
358
194
{ .name = "disable", .key = 'd',
359
195
.arg = "PLUGIN",
360
196
.doc = "Disable a specific plugin", .group = 1 },
361
{ .name = "enable", .key = 'e',
362
.arg = "PLUGIN",
363
.doc = "Enable a specific plugin", .group = 1 },
364
197
{ .name = "plugin-dir", .key = 128,
365
198
.arg = "DIRECTORY",
366
199
.doc = "Specify a different plugin directory", .group = 2 },
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 },
200
{ .name = "userid", .key = 129,
201
.arg = "ID", .flags = 0,
202
.doc = "User ID the plugins will run as", .group = 2 },
203
{ .name = "groupid", .key = 130,
204
.arg = "ID", .flags = 0,
205
.doc = "Group ID the plugins will run as", .group = 2 },
206
{ .name = "debug", .key = 131,
207
.doc = "Debug mode", .group = 3 },
378
208
{ .name = NULL }
379
209
};
380
210
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
383
switch(key){
384
case 'g': /* --global-options */
385
if(arg != NULL){
386
char *plugin_option;
387
while((plugin_option = strsep(&arg, ",")) != NULL){
388
if(plugin_option[0] == '\0'){
389
continue;
390
}
391
if(not add_argument(getplugin(NULL), plugin_option)){
392
perror("add_argument");
393
return ARGP_ERR_UNKNOWN;
394
}
395
}
396
}
397
break;
398
case 'G': /* --global-env */
399
if(arg == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), arg, true)){
403
perror("add_environment");
404
}
405
break;
406
case 'o': /* --options-for */
407
if(arg != NULL){
408
char *plugin_name = strsep(&arg, ":");
409
if(plugin_name[0] == '\0'){
410
break;
411
}
412
char *plugin_option;
413
while((plugin_option = strsep(&arg, ",")) != NULL){
414
if(not add_argument(getplugin(plugin_name), plugin_option)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
417
}
418
}
419
}
420
break;
421
case 'E': /* --env-for */
422
if(arg == NULL){
423
break;
424
}
425
{
426
char *envdef = strchr(arg, ':');
427
if(envdef == NULL){
428
break;
429
}
430
*envdef = '\0';
431
if(not add_environment(getplugin(arg), envdef+1, true)){
432
perror("add_environment");
433
}
434
}
435
break;
436
case 'd': /* --disable */
437
if(arg != NULL){
438
plugin *p = getplugin(arg);
439
if(p == NULL){
440
return ARGP_ERR_UNKNOWN;
441
}
442
p->disabled = true;
443
}
444
break;
445
case 'e': /* --enable */
446
if(arg != NULL){
447
plugin *p = getplugin(arg);
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
450
}
451
p->disabled = false;
452
}
453
break;
454
case 128: /* --plugin-dir */
455
free(plugindir);
456
plugindir = strdup(arg);
457
if(plugindir == NULL){
458
perror("strdup");
459
}
460
break;
461
case 129: /* --config-file */
462
/* This is already done by parse_opt_config_file() */
463
break;
464
case 130: /* --userid */
465
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
466
if(ret < 1 or tmpmax != (uid_t)tmpmax
467
or arg[numchars] != '\0'){
468
fprintf(stderr, "Bad user ID number: \"%s\", using %"
469
PRIdMAX "\n", arg, (intmax_t)uid);
470
} else {
471
uid = (uid_t)tmpmax;
472
}
473
break;
474
case 131: /* --groupid */
475
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
476
if(ret < 1 or tmpmax != (gid_t)tmpmax
477
or arg[numchars] != '\0'){
478
fprintf(stderr, "Bad group ID number: \"%s\", using %"
479
PRIdMAX "\n", arg, (intmax_t)gid);
480
} else {
481
gid = (gid_t)tmpmax;
482
}
483
break;
484
case 132: /* --debug */
211
error_t parse_opt (int key, char *arg, struct argp_state *state) {
212
/* Get the INPUT argument from `argp_parse', which we know is a
213
pointer to our plugin list pointer. */
214
plugin **plugins = state->input;
215
switch (key) {
216
case 'g':
217
if (arg != NULL){
218
char *p = strtok(arg, ",");
219
do{
220
addargument(getplugin(NULL, plugins), p);
221
p = strtok(NULL, ",");
222
} while (p != NULL);
223
}
224
break;
225
case 'o':
226
if (arg != NULL){
227
char *name = strtok(arg, ":");
228
char *p = strtok(NULL, ":");
229
if(p != NULL){
230
p = strtok(p, ",");
231
do{
232
addargument(getplugin(name, plugins), p);
233
p = strtok(NULL, ",");
234
} while (p != NULL);
235
}
236
}
237
break;
238
case 'd':
239
if (arg != NULL){
240
getplugin(arg, plugins)->disabled = true;
241
}
242
break;
243
case 128:
244
plugindir = arg;
245
break;
246
case 129:
247
uid = (uid_t)strtol(arg, NULL, 10);
248
break;
249
case 130:
250
gid = (gid_t)strtol(arg, NULL, 10);
251
break;
252
case 131:
485
253
debug = true;
486
254
break;
487
/*
488
* When adding more options before this line, remember to also add a
489
* "case" to the "parse_opt_config_file" function below.
490
*/
491
case ARGP_KEY_ARG:
492
/* Cryptsetup always passes an argument, which is an empty
493
string if "none" was specified in /etc/crypttab. So if
494
argument was empty, we ignore it silently. */
495
if(arg[0] != '\0'){
496
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
497
}
498
break;
499
case ARGP_KEY_END:
500
break;
501
default:
502
return ARGP_ERR_UNKNOWN;
503
}
504
return 0;
505
}
506
507
/* This option parser is the same as parse_opt() above, except it
508
ignores everything but the --config-file option. */
509
error_t parse_opt_config_file(int key, char *arg,
510
__attribute__((unused))
511
struct argp_state *state){
512
switch(key){
513
case 'g': /* --global-options */
514
case 'G': /* --global-env */
515
case 'o': /* --options-for */
516
case 'E': /* --env-for */
517
case 'd': /* --disable */
518
case 'e': /* --enable */
519
case 128: /* --plugin-dir */
520
break;
521
case 129: /* --config-file */
522
free(argfile);
523
argfile = strdup(arg);
524
if(argfile == NULL){
525
perror("strdup");
526
}
527
break;
528
case 130: /* --userid */
529
case 131: /* --groupid */
530
case 132: /* --debug */
531
case ARGP_KEY_ARG:
532
case ARGP_KEY_END:
533
break;
534
default:
535
return ARGP_ERR_UNKNOWN;
536
}
537
return 0;
538
}
539
540
struct argp argp = { .options = options,
541
.parser = parse_opt_config_file,
542
.args_doc = "",
255
case ARGP_KEY_ARG:
256
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
257
argp_usage (state);
258
}
259
plus_options = arg;
260
break;
261
case ARGP_KEY_END:
262
break;
263
default:
264
return ARGP_ERR_UNKNOWN;
265
}
266
return 0;
267
}
268
269
plugin *plugin_list = NULL;
270
271
struct argp argp = { .options = options, .parser = parse_opt,
272
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
543
273
.doc = "Mandos plugin runner -- Run plugins" };
544
274
545
/* Parse using parse_opt_config_file() in order to get the custom
546
config file location, if any. */
547
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
548
if(ret == ARGP_ERR_UNKNOWN){
549
fprintf(stderr, "Unknown error while parsing arguments\n");
550
exitstatus = EXIT_FAILURE;
551
goto fallback;
552
}
553
554
/* Reset to the normal argument parser */
555
argp.parser = parse_opt;
556
557
/* Open the configfile if available */
558
if(argfile == NULL){
559
conffp = fopen(AFILE, "r");
560
} else {
561
conffp = fopen(argfile, "r");
562
}
563
if(conffp != NULL){
564
char *org_line = NULL;
565
char *p, *arg, *new_arg, *line;
566
size_t size = 0;
567
const char whitespace_delims[] = " \r\t\f\v\n";
568
const char comment_delim[] = "#";
569
570
custom_argc = 1;
571
custom_argv = malloc(sizeof(char*) * 2);
572
if(custom_argv == NULL){
275
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
276
277
if(plus_options){
278
/* This is a mangled argument in the form of
279
"+--option+--other-option=parameter+--yet-another-option", etc */
280
/* Make new argc and argv vars, and call argp_parse() again. */
281
plus_options++; /* skip the first '+' character */
282
const char delims[] = "+";
283
char *arg;
284
int new_argc = 1;
285
plus_argv = malloc(sizeof(char*) * 2);
286
if(plus_argv == NULL){
573
287
perror("malloc");
574
288
exitstatus = EXIT_FAILURE;
575
goto fallback;
576
}
577
custom_argv[0] = argv[0];
578
custom_argv[1] = NULL;
579
580
/* for each line in the config file, strip whitespace and ignore
581
commented text */
582
while(true){
583
sret = getline(&org_line, &size, conffp);
584
if(sret == -1){
585
break;
586
}
587
588
line = org_line;
589
arg = strsep(&line, comment_delim);
590
while((p = strsep(&arg, whitespace_delims)) != NULL){
591
if(p[0] == '\0'){
592
continue;
593
}
594
new_arg = strdup(p);
595
if(new_arg == NULL){
596
perror("strdup");
597
exitstatus = EXIT_FAILURE;
598
free(org_line);
599
goto fallback;
600
}
601
602
custom_argc += 1;
603
custom_argv = realloc(custom_argv, sizeof(char *)
604
* ((unsigned int) custom_argc + 1));
605
if(custom_argv == NULL){
606
perror("realloc");
607
exitstatus = EXIT_FAILURE;
608
free(org_line);
609
goto fallback;
610
}
611
custom_argv[custom_argc-1] = new_arg;
612
custom_argv[custom_argc] = NULL;
613
}
614
}
615
free(org_line);
616
} else {
617
/* Check for harmful errors and go to fallback. Other errors might
618
not affect opening plugins */
619
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
620
perror("fopen");
621
exitstatus = EXIT_FAILURE;
622
goto fallback;
623
}
624
}
625
/* If there was any arguments from configuration file,
626
pass them to parser as command arguments */
627
if(custom_argv != NULL){
628
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
629
0, NULL);
630
if(ret == ARGP_ERR_UNKNOWN){
631
fprintf(stderr, "Unknown error while parsing arguments\n");
632
exitstatus = EXIT_FAILURE;
633
goto fallback;
634
}
635
}
636
637
/* Parse actual command line arguments, to let them override the
638
config file */
639
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
640
if(ret == ARGP_ERR_UNKNOWN){
641
fprintf(stderr, "Unknown error while parsing arguments\n");
642
exitstatus = EXIT_FAILURE;
643
goto fallback;
289
goto end;
290
}
291
plus_argv[0] = argv[0];
292
plus_argv[1] = NULL;
293
arg = strtok(plus_options, delims); /* Get first argument */
294
while(arg != NULL){
295
new_argc++;
296
plus_argv = realloc(plus_argv, sizeof(char *)
297
* ((unsigned int) new_argc + 1));
298
if(plus_argv == NULL){
299
perror("malloc");
300
exitstatus = EXIT_FAILURE;
301
goto end;
302
}
303
plus_argv[new_argc-1] = arg;
304
plus_argv[new_argc] = NULL;
305
arg = strtok(NULL, delims); /* Get next argument */
306
}
307
argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
644
308
}
645
309
646
310
if(debug){
650
314
for(char **a = p->argv; *a != NULL; a++){
651
315
fprintf(stderr, "\tArg: %s\n", *a);
652
316
}
653
fprintf(stderr, "...and %d environment variables\n", p->envc);
654
for(char **a = p->environ; *a != NULL; a++){
655
fprintf(stderr, "\t%s\n", *a);
656
}
657
317
}
658
318
}
659
319
660
/* Strip permissions down to nobody */
320
ret = setuid(uid);
321
if (ret == -1){
322
perror("setuid");
323
}
324
661
325
setgid(gid);
662
if(ret == -1){
326
if (ret == -1){
663
327
perror("setgid");
664
328
}
665
ret = setuid(uid);
666
if(ret == -1){
667
perror("setuid");
668
}
669
670
if(plugindir == NULL){
671
dir = opendir(PDIR);
672
} else {
673
dir = opendir(plugindir);
674
}
675
329
330
dir = opendir(plugindir);
676
331
if(dir == NULL){
677
332
perror("Could not open plugin dir");
678
333
exitstatus = EXIT_FAILURE;
679
goto fallback;
334
goto end;
680
335
}
681
336
682
337
/* Set the FD_CLOEXEC flag on the directory, if possible */
687
342
if(ret < 0){
688
343
perror("set_cloexec_flag");
689
344
exitstatus = EXIT_FAILURE;
690
goto fallback;
345
goto end;
691
346
}
692
347
}
693
348
}
694
349
695
350
FD_ZERO(&rfds_all);
696
351
697
/* Read and execute any executable in the plugin directory*/
698
352
while(true){
699
353
dirst = readdir(dir);
700
354
701
/* All directory entries have been processed */
355
// All directory entries have been processed
702
356
if(dirst == NULL){
703
if(errno == EBADF){
704
perror("readdir");
705
exitstatus = EXIT_FAILURE;
706
goto fallback;
707
}
708
357
break;
709
358
}
710
359
711
360
d_name_len = strlen(dirst->d_name);
712
361
713
/* Ignore dotfiles, backup files and other junk */
362
// Ignore dotfiles, backup files and other junk
714
363
{
715
364
bool bad_name = false;
716
365
718
367
719
368
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
720
369
".dpkg-old",
721
".dpkg-bak",
722
370
".dpkg-divert", NULL };
723
371
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
724
372
size_t pre_len = strlen(*pre);
732
380
break;
733
381
}
734
382
}
383
735
384
if(bad_name){
736
385
continue;
737
386
}
387
738
388
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
739
389
size_t suf_len = strlen(*suf);
740
390
if((d_name_len >= suf_len)
753
403
continue;
754
404
}
755
405
}
756
757
char *filename;
758
if(plugindir == NULL){
759
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
760
} else {
761
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
762
}
763
if(ret < 0){
764
perror("asprintf");
765
continue;
766
}
767
768
ret = stat(filename, &st);
769
if(ret == -1){
770
perror("stat");
771
free(filename);
772
continue;
773
}
774
775
/* Ignore non-executable files */
776
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
406
407
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
408
if (filename == NULL){
409
perror("malloc");
410
exitstatus = EXIT_FAILURE;
411
goto end;
412
}
413
strcpy(filename, plugindir); /* Spurious warning */
414
strcat(filename, "/"); /* Spurious warning */
415
strcat(filename, dirst->d_name); /* Spurious warning */
416
417
stat(filename, &st);
418
419
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
777
420
if(debug){
778
421
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
779
422
" with bad type or mode\n", filename);
781
424
free(filename);
782
425
continue;
783
426
}
784
785
plugin *p = getplugin(dirst->d_name);
786
if(p == NULL){
787
perror("getplugin");
788
free(filename);
789
continue;
790
}
791
if(p->disabled){
427
if(getplugin(dirst->d_name, &plugin_list)->disabled){
792
428
if(debug){
793
429
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
794
430
dirst->d_name);
796
432
free(filename);
797
433
continue;
798
434
}
435
plugin *p = getplugin(dirst->d_name, &plugin_list);
799
436
{
800
437
/* Add global arguments to argument list for this plugin */
801
plugin *g = getplugin(NULL);
802
if(g != NULL){
803
for(char **a = g->argv + 1; *a != NULL; a++){
804
if(not add_argument(p, *a)){
805
perror("add_argument");
806
}
807
}
808
/* Add global environment variables */
809
for(char **e = g->environ; *e != NULL; e++){
810
if(not add_environment(p, *e, false)){
811
perror("add_environment");
812
}
813
}
814
}
815
}
816
/* If this plugin has any environment variables, we will call
817
using execve and need to duplicate the environment from this
818
process, too. */
819
if(p->environ[0] != NULL){
820
for(char **e = environ; *e != NULL; e++){
821
if(not add_environment(p, *e, false)){
822
perror("add_environment");
823
}
824
}
825
}
826
827
int pipefd[2];
438
plugin *g = getplugin(NULL, &plugin_list);
439
for(char **a = g->argv + 1; *a != NULL; a++){
440
addargument(p, *a);
441
}
442
}
443
int pipefd[2];
828
444
ret = pipe(pipefd);
829
if(ret == -1){
445
if (ret == -1){
830
446
perror("pipe");
831
447
exitstatus = EXIT_FAILURE;
832
goto fallback;
448
goto end;
833
449
}
834
/* Ask OS to automatic close the pipe on exec */
835
450
ret = set_cloexec_flag(pipefd[0]);
836
451
if(ret < 0){
837
452
perror("set_cloexec_flag");
838
453
exitstatus = EXIT_FAILURE;
839
goto fallback;
454
goto end;
840
455
}
841
456
ret = set_cloexec_flag(pipefd[1]);
842
457
if(ret < 0){
843
458
perror("set_cloexec_flag");
844
459
exitstatus = EXIT_FAILURE;
845
goto fallback;
460
goto end;
846
461
}
847
462
/* Block SIGCHLD until process is safely in process list */
848
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
463
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
849
464
if(ret < 0){
850
465
perror("sigprocmask");
851
466
exitstatus = EXIT_FAILURE;
852
goto fallback;
467
goto end;
853
468
}
854
/* Starting a new process to be watched */
469
// Starting a new process to be watched
855
470
pid_t pid = fork();
856
if(pid == -1){
857
perror("fork");
858
exitstatus = EXIT_FAILURE;
859
goto fallback;
860
}
861
471
if(pid == 0){
862
472
/* this is the child process */
863
473
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
865
475
perror("sigaction");
866
476
_exit(EXIT_FAILURE);
867
477
}
868
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
478
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
869
479
if(ret < 0){
870
480
perror("sigprocmask");
871
481
_exit(EXIT_FAILURE);
872
482
}
873
874
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
875
if(ret == -1){
876
perror("dup2");
877
_exit(EXIT_FAILURE);
878
}
483
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
879
484
880
485
if(dirfd(dir) < 0){
881
486
/* If dir has no file descriptor, we could not set FD_CLOEXEC
882
487
above and must now close it manually here. */
883
488
closedir(dir);
884
489
}
885
if(p->environ[0] == NULL){
886
if(execv(filename, p->argv) < 0){
887
perror("execv");
888
_exit(EXIT_FAILURE);
889
}
890
} else {
891
if(execve(filename, p->argv, p->environ) < 0){
892
perror("execve");
893
_exit(EXIT_FAILURE);
894
}
490
if(execv(filename, p->argv) < 0){
491
perror("execv");
492
_exit(EXIT_FAILURE);
895
493
}
896
494
/* no return */
897
495
}
898
/* Parent process */
899
close(pipefd[1]); /* Close unused write end of pipe */
496
/* parent process */
900
497
free(filename);
901
plugin *new_plugin = getplugin(dirst->d_name);
902
if(new_plugin == NULL){
903
perror("getplugin");
904
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
498
close(pipefd[1]); /* close unused write end of pipe */
499
process *new_process = malloc(sizeof(process));
500
if (new_process == NULL){
501
perror("malloc");
502
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
905
503
if(ret < 0){
906
perror("sigprocmask");
504
perror("sigprocmask");
907
505
}
908
506
exitstatus = EXIT_FAILURE;
909
goto fallback;
507
goto end;
910
508
}
911
509
912
new_plugin->pid = pid;
913
new_plugin->fd = pipefd[0];
914
510
*new_process = (struct process){ .pid = pid,
511
.fd = pipefd[0],
512
.next = process_list };
513
// List handling
514
process_list = new_process;
915
515
/* Unblock SIGCHLD so signal handler can be run if this process
916
516
has already completed */
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
517
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
918
518
if(ret < 0){
919
519
perror("sigprocmask");
920
520
exitstatus = EXIT_FAILURE;
921
goto fallback;
922
}
923
924
FD_SET(new_plugin->fd, &rfds_all);
925
926
if(maxfd < new_plugin->fd){
927
maxfd = new_plugin->fd;
928
}
521
goto end;
522
}
523
524
FD_SET(new_process->fd, &rfds_all);
525
526
if (maxfd < new_process->fd){
527
maxfd = new_process->fd;
528
}
529
530
}
531
532
/* Free the plugin list */
533
for(plugin *next; plugin_list != NULL; plugin_list = next){
534
next = plugin_list->next;
535
free(plugin_list->argv);
536
free(plugin_list);
929
537
}
930
538
931
539
closedir(dir);
932
540
dir = NULL;
933
free_plugin(getplugin(NULL));
934
541
935
for(plugin *p = plugin_list; p != NULL; p = p->next){
936
if(p->pid != 0){
937
break;
938
}
939
if(p->next == NULL){
940
fprintf(stderr, "No plugin processes started. Incorrect plugin"
941
" directory?\n");
942
free_plugin_list();
943
}
542
if (process_list == NULL){
543
fprintf(stderr, "No plugin processes started, exiting\n");
544
exitstatus = EXIT_FAILURE;
545
goto end;
944
546
}
945
946
/* Main loop while running plugins exist */
947
while(plugin_list){
547
while(process_list){
948
548
fd_set rfds = rfds_all;
949
549
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
950
if(select_ret == -1){
550
if (select_ret == -1){
951
551
perror("select");
952
552
exitstatus = EXIT_FAILURE;
953
goto fallback;
553
goto end;
954
554
}
955
555
/* OK, now either a process completed, or something can be read
956
556
from one of them */
957
for(plugin *proc = plugin_list; proc != NULL;){
557
for(process *proc = process_list; proc ; proc = proc->next){
958
558
/* Is this process completely done? */
959
if(proc->completed and proc->eof){
559
if(proc->eof and proc->completed){
960
560
/* Only accept the plugin output if it exited cleanly */
961
561
if(not WIFEXITED(proc->status)
962
562
or WEXITSTATUS(proc->status) != 0){
963
563
/* Bad exit by plugin */
964
965
564
if(debug){
966
565
if(WIFEXITED(proc->status)){
967
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
968
" status %d\n", proc->name,
969
(intmax_t) (proc->pid),
970
WEXITSTATUS(proc->status));
971
} else if(WIFSIGNALED(proc->status)){
972
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
973
" signal %d\n", proc->name,
974
(intmax_t) (proc->pid),
975
WTERMSIG(proc->status));
566
fprintf(stderr, "Plugin %d exited with status %d\n",
567
proc->pid, WEXITSTATUS(proc->status));
568
} else if(WIFSIGNALED(proc->status)) {
569
fprintf(stderr, "Plugin %d killed by signal %d\n",
570
proc->pid, WTERMSIG(proc->status));
976
571
} else if(WCOREDUMP(proc->status)){
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
978
" core\n", proc->name, (intmax_t) (proc->pid));
572
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
979
573
}
980
574
}
981
982
575
/* Remove the plugin */
983
576
FD_CLR(proc->fd, &rfds_all);
984
985
577
/* Block signal while modifying process_list */
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
578
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
987
579
if(ret < 0){
988
580
perror("sigprocmask");
989
581
exitstatus = EXIT_FAILURE;
990
goto fallback;
991
}
992
993
plugin *next_plugin = proc->next;
994
free_plugin(proc);
995
proc = next_plugin;
996
582
goto end;
583
}
584
/* Delete this process entry from the list */
585
if(process_list == proc){
586
/* First one - simple */
587
process_list = proc->next;
588
} else {
589
/* Second one or later */
590
for(process *p = process_list; p != NULL; p = p->next){
591
if(p->next == proc){
592
p->next = proc->next;
593
break;
594
}
595
}
596
}
997
597
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
598
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
599
NULL);
1000
600
if(ret < 0){
1001
601
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1003
goto fallback;
1004
}
1005
1006
if(plugin_list == NULL){
1007
break;
1008
}
1009
1010
continue;
602
}
603
free(proc->buffer);
604
free(proc);
605
/* We deleted this process from the list, so we can't go
606
proc->next. Therefore, start over from the beginning of
607
the process list */
608
break;
1011
609
}
1012
1013
610
/* This process exited nicely, so print its buffer */
1014
1015
bool bret = print_out_password(proc->buffer,
1016
proc->buffer_length);
1017
if(not bret){
1018
perror("print_out_password");
1019
exitstatus = EXIT_FAILURE;
611
for(size_t written = 0; written < proc->buffer_length;
612
written += (size_t)ret){
613
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
614
proc->buffer + written,
615
proc->buffer_length
616
- written));
617
if(ret < 0){
618
perror("write");
619
exitstatus = EXIT_FAILURE;
620
goto end;
621
}
1020
622
}
1021
goto fallback;
623
goto end;
1022
624
}
1023
1024
625
/* This process has not completed. Does it have any output? */
1025
626
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1026
627
/* This process had nothing to say at this time */
1027
proc = proc->next;
1028
628
continue;
1029
629
}
1030
630
/* Before reading, make the process' data buffer large enough */
1031
631
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1032
632
proc->buffer = realloc(proc->buffer, proc->buffer_size
1033
633
+ (size_t) BUFFER_SIZE);
1034
if(proc->buffer == NULL){
634
if (proc->buffer == NULL){
1035
635
perror("malloc");
1036
636
exitstatus = EXIT_FAILURE;
1037
goto fallback;
637
goto end;
1038
638
}
1039
639
proc->buffer_size += BUFFER_SIZE;
1040
640
}
1041
641
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1044
if(sret < 0){
642
ret = read(proc->fd, proc->buffer + proc->buffer_length,
643
BUFFER_SIZE);
644
if(ret < 0){
1045
645
/* Read error from this process; ignore the error */
1046
proc = proc->next;
1047
646
continue;
1048
647
}
1049
if(sret == 0){
648
if(ret == 0){
1050
649
/* got EOF */
1051
650
proc->eof = true;
1052
651
} else {
1053
proc->buffer_length += (size_t) sret;
652
proc->buffer_length += (size_t) ret;
1054
653
}
1055
654
}
1056
655
}
1057
1058
1059
fallback:
1060
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1062
/* Fallback if all plugins failed, none are found or an error
1063
occured */
1064
bool bret;
1065
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1066
char *passwordbuffer = getpass("Password: ");
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);
1074
if(not bret){
1075
perror("print_out_password");
1076
exitstatus = EXIT_FAILURE;
1077
}
656
if(process_list == NULL){
657
fprintf(stderr, "All plugin processes failed, exiting\n");
658
exitstatus = EXIT_FAILURE;
1078
659
}
1079
660
661
end:
1080
662
/* Restore old signal handler */
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);
663
sigaction(SIGCHLD, &old_sigchld_action, NULL);
664
665
free(plus_argv);
666
667
/* Free the plugin list */
668
for(plugin *next; plugin_list != NULL; plugin_list = next){
669
next = plugin_list->next;
670
free(plugin_list->argv);
671
free(plugin_list);
1092
672
}
1093
673
1094
674
if(dir != NULL){
1095
675
closedir(dir);
1096
676
}
1097
677
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
}
1107
}
678
/* Free the process list and kill the processes */
679
for(process *next; process_list != NULL; process_list = next){
680
next = process_list->next;
681
close(process_list->fd);
682
kill(process_list->pid, SIGTERM);
683
free(process_list->buffer);
684
free(process_list);
1108
685
}
1109
686
1110
687
/* Wait for any remaining child processes to terminate */
1115
692
perror("wait");
1116
693
}
1117
694
1118
free_plugin_list();
1119
1120
free(plugindir);
1121
free(argfile);
1122
1123
695
return exitstatus;
1124
696
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0