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- Committer: Teddy Hogeborn
- Date: 2009-02-09 19:33:46 UTC
- mfrom: (24.1.135 mandos)
- Revision ID: teddy@fukt.bsnet.se-20090209193346-5insyr1rsisor8dj
Merge from Björn:
* plugins.d/mandos-client.c (mc): Initialize globally.
(main): Better handling of signals.
* plugins.d/mandos-client.c (mc): Initialize globally.
(main): Better handling of signals.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- server.conf => mandos.conf
- plugbasedclient.c => plugin-runner.c
- plugins.d/mandosclient.c => plugins.d/mandos-client.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- 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
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
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(),
27
32
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() */
28
43
#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() */
34
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
35
readdir(), closedir() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
45
readdir(), closedir(), dirfd() */
37
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
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() */
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() */
48
56
#include <errno.h> /* errno */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
52
53
struct process;
54
55
typedef struct process{
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, */
69
70
#define BUFFER_SIZE 256
71
72
#define PDIR "/lib/mandos/plugins.d"
73
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
75
const char *argp_program_version = "plugin-runner " VERSION;
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*/
56
87
pid_t pid;
57
88
int fd;
58
89
char *buffer;
59
90
size_t buffer_size;
60
91
size_t buffer_length;
61
92
bool eof;
62
bool completed;
93
volatile sig_atomic_t completed;
63
94
int status;
64
struct process *next;
65
} process;
66
67
typedef struct plugin{
68
char *name; /* can be NULL or any plugin name */
69
char **argv;
70
int argc;
71
bool disabled;
72
95
struct plugin *next;
73
96
} plugin;
74
97
75
plugin *getplugin(char *name, plugin **plugin_list){
76
for (plugin *p = *plugin_list; p != NULL; p = p->next){
77
if ((p->name == name)
78
or (p->name and name and (strcmp(p->name, name) == 0))){
98
static plugin *plugin_list = NULL;
99
100
/* Gets an existing plugin based on name,
101
or if none is found, creates a new one */
102
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
if((p->name == name)
106
or (p->name and name and (strcmp(p->name, name) == 0))){
79
107
return p;
80
108
}
81
109
}
82
110
/* Create a new plugin */
83
111
plugin *new_plugin = malloc(sizeof(plugin));
84
if (new_plugin == NULL){
85
perror("malloc");
86
exit(EXIT_FAILURE);
87
}
88
new_plugin->name = name;
112
if(new_plugin == NULL){
113
return NULL;
114
}
115
char *copy_name = NULL;
116
if(name != NULL){
117
copy_name = strdup(name);
118
if(copy_name == NULL){
119
free(new_plugin);
120
return NULL;
121
}
122
}
123
124
*new_plugin = (plugin){ .name = copy_name,
125
.argc = 1,
126
.disabled = false,
127
.next = plugin_list };
128
89
129
new_plugin->argv = malloc(sizeof(char *) * 2);
90
if (new_plugin->argv == NULL){
91
perror("malloc");
92
exit(EXIT_FAILURE);
130
if(new_plugin->argv == NULL){
131
free(copy_name);
132
free(new_plugin);
133
return NULL;
93
134
}
94
new_plugin->argv[0] = name;
135
new_plugin->argv[0] = copy_name;
95
136
new_plugin->argv[1] = NULL;
96
new_plugin->argc = 1;
97
new_plugin->disabled = false;
98
new_plugin->next = *plugin_list;
137
138
new_plugin->environ = malloc(sizeof(char *));
139
if(new_plugin->environ == NULL){
140
free(copy_name);
141
free(new_plugin->argv);
142
free(new_plugin);
143
return NULL;
144
}
145
new_plugin->environ[0] = NULL;
146
99
147
/* Append the new plugin to the list */
100
*plugin_list = new_plugin;
148
plugin_list = new_plugin;
101
149
return new_plugin;
102
150
}
103
151
104
void addargument(plugin *p, char *arg){
105
p->argv[p->argc] = arg;
106
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
107
if (p->argv == NULL){
108
perror("malloc");
109
exit(EXIT_FAILURE);
110
}
111
p->argc++;
112
p->argv[p->argc] = NULL;
152
/* Helper function for add_argument and add_environment */
153
static bool add_to_char_array(const char *new, char ***array,
154
int *len){
155
/* Resize the pointed-to array to hold one more pointer */
156
*array = realloc(*array, sizeof(char *)
157
* (size_t) ((*len) + 2));
158
/* Malloc check */
159
if(*array == NULL){
160
return false;
161
}
162
/* Make a copy of the new string */
163
char *copy = strdup(new);
164
if(copy == NULL){
165
return false;
166
}
167
/* Insert the copy */
168
(*array)[*len] = copy;
169
(*len)++;
170
/* Add a new terminating NULL pointer to the last element */
171
(*array)[*len] = NULL;
172
return true;
173
}
174
175
/* Add to a plugin's argument vector */
176
static bool add_argument(plugin *p, const char *arg){
177
if(p == NULL){
178
return false;
179
}
180
return add_to_char_array(arg, &(p->argv), &(p->argc));
181
}
182
183
/* Add to a plugin's environment */
184
static bool add_environment(plugin *p, const char *def, bool replace){
185
if(p == NULL){
186
return false;
187
}
188
/* namelen = length of name of environment variable */
189
size_t namelen = (size_t)(strchrnul(def, '=') - def);
190
/* Search for this environment variable */
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
193
/* It already exists */
194
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
196
if(new == NULL){
197
return false;
198
}
199
*e = new;
200
strcpy(*e, def);
201
}
202
return true;
203
}
204
}
205
return add_to_char_array(def, &(p->environ), &(p->envc));
113
206
}
114
207
115
208
/*
117
210
* Descriptor Flags".
118
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
119
212
*/
120
int set_cloexec_flag(int fd)
121
{
213
static int set_cloexec_flag(int fd){
122
214
int ret = fcntl(fd, F_GETFD, 0);
123
215
/* If reading the flags failed, return error indication now. */
124
216
if(ret < 0){
128
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
129
221
}
130
222
131
#define BUFFER_SIZE 256
132
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
223
224
/* Mark processes as completed when they exit, and save their exit
139
225
status. */
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;
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
}
153
305
}
154
306
155
307
int main(int argc, char *argv[]){
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
308
char *plugindir = NULL;
309
char *argfile = NULL;
310
FILE *conffp;
157
311
size_t d_name_len;
158
312
DIR *dir = NULL;
159
313
struct dirent *dirst;
160
314
struct stat st;
161
315
fd_set rfds_all;
162
int ret, maxfd = 0;
316
int ret, numchars, maxfd = 0;
317
ssize_t sret;
318
intmax_t tmpmax;
163
319
uid_t uid = 65534;
164
320
gid_t gid = 65534;
165
321
bool debug = false;
167
323
struct sigaction old_sigchld_action;
168
324
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
169
325
.sa_flags = SA_NOCLDSTOP };
170
326
char **custom_argv = NULL;
327
int custom_argc = 0;
328
171
329
/* Establish a signal handler */
172
330
sigemptyset(&sigchld_action.sa_mask);
173
331
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
174
if(ret < 0){
332
if(ret == -1){
175
333
perror("sigaddset");
176
exit(EXIT_FAILURE);
334
exitstatus = EXIT_FAILURE;
335
goto fallback;
177
336
}
178
337
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
179
if(ret < 0){
338
if(ret == -1){
180
339
perror("sigaction");
181
exit(EXIT_FAILURE);
340
exitstatus = EXIT_FAILURE;
341
goto fallback;
182
342
}
183
343
184
344
/* The options we understand. */
186
346
{ .name = "global-options", .key = 'g',
187
347
.arg = "OPTION[,OPTION[,...]]",
188
348
.doc = "Options passed to all plugins" },
349
{ .name = "global-env", .key = 'G',
350
.arg = "VAR=value",
351
.doc = "Environment variable passed to all plugins" },
189
352
{ .name = "options-for", .key = 'o',
190
353
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
191
354
.doc = "Options passed only to specified plugin" },
355
{ .name = "env-for", .key = 'E',
356
.arg = "PLUGIN:ENV=value",
357
.doc = "Environment variable passed to specified plugin" },
192
358
{ .name = "disable", .key = 'd',
193
359
.arg = "PLUGIN",
194
360
.doc = "Disable a specific plugin", .group = 1 },
361
{ .name = "enable", .key = 'e',
362
.arg = "PLUGIN",
363
.doc = "Enable a specific plugin", .group = 1 },
195
364
{ .name = "plugin-dir", .key = 128,
196
365
.arg = "DIRECTORY",
197
366
.doc = "Specify a different plugin directory", .group = 2 },
198
{ .name = "userid", .key = 129,
199
.arg = "ID", .flags = 0,
200
.doc = "User ID the plugins will run as", .group = 2 },
201
{ .name = "groupid", .key = 130,
202
.arg = "ID", .flags = 0,
203
.doc = "Group ID the plugins will run as", .group = 2 },
204
{ .name = "debug", .key = 131,
205
.doc = "Debug mode", .group = 3 },
367
{ .name = "config-file", .key = 129,
368
.arg = "FILE",
369
.doc = "Specify a different configuration file", .group = 2 },
370
{ .name = "userid", .key = 130,
371
.arg = "ID", .flags = 0,
372
.doc = "User ID the plugins will run as", .group = 3 },
373
{ .name = "groupid", .key = 131,
374
.arg = "ID", .flags = 0,
375
.doc = "Group ID the plugins will run as", .group = 3 },
376
{ .name = "debug", .key = 132,
377
.doc = "Debug mode", .group = 4 },
206
378
{ .name = NULL }
207
379
};
208
380
209
error_t parse_opt (int key, char *arg, struct argp_state *state) {
210
/* Get the INPUT argument from `argp_parse', which we know is a
211
pointer to our plugin list pointer. */
212
plugin **plugins = state->input;
213
switch (key) {
214
case 'g':
215
if (arg != NULL){
216
char *p = strtok(arg, ",");
217
do{
218
addargument(getplugin(NULL, plugins), p);
219
p = strtok(NULL, ",");
220
} while (p);
221
}
222
break;
223
case 'o':
224
if (arg != NULL){
225
char *name = strtok(arg, ":");
226
char *p = strtok(NULL, ":");
227
if(p){
228
p = strtok(p, ",");
229
do{
230
addargument(getplugin(name, plugins), p);
231
p = strtok(NULL, ",");
232
} while (p);
233
}
234
}
235
break;
236
case 'd':
237
if (arg != NULL){
238
getplugin(arg, plugins)->disabled = true;
239
}
240
break;
241
case 128:
242
plugindir = arg;
243
break;
244
case 129:
245
uid = (uid_t)strtol(arg, NULL, 10);
246
break;
247
case 130:
248
gid = (gid_t)strtol(arg, NULL, 10);
249
break;
250
case 131:
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 */
251
485
debug = true;
252
486
break;
253
case ARGP_KEY_ARG:
254
argp_usage (state);
255
break;
256
case ARGP_KEY_END:
257
break;
258
default:
259
return ARGP_ERR_UNKNOWN;
260
}
261
return 0;
262
}
263
264
plugin *plugin_list = NULL;
265
266
struct argp argp = { .options = options, .parser = parse_opt,
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,
267
542
.args_doc = "",
268
543
.doc = "Mandos plugin runner -- Run plugins" };
269
544
270
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
271
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){
573
perror("malloc");
574
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;
644
}
645
272
646
if(debug){
273
647
for(plugin *p = plugin_list; p != NULL; p=p->next){
274
648
fprintf(stderr, "Plugin: %s has %d arguments\n",
276
650
for(char **a = p->argv; *a != NULL; a++){
277
651
fprintf(stderr, "\tArg: %s\n", *a);
278
652
}
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
}
279
657
}
280
658
}
281
659
660
/* Strip permissions down to nobody */
661
setgid(gid);
662
if(ret == -1){
663
perror("setgid");
664
}
282
665
ret = setuid(uid);
283
if (ret == -1){
284
perror("setuid");
285
}
286
287
setgid(gid);
288
if (ret == -1){
289
perror("setuid");
290
}
291
292
dir = opendir(plugindir);
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
293
676
if(dir == NULL){
294
677
perror("Could not open plugin dir");
295
678
exitstatus = EXIT_FAILURE;
296
goto end;
679
goto fallback;
297
680
}
298
681
299
682
/* Set the FD_CLOEXEC flag on the directory, if possible */
304
687
if(ret < 0){
305
688
perror("set_cloexec_flag");
306
689
exitstatus = EXIT_FAILURE;
307
goto end;
690
goto fallback;
308
691
}
309
692
}
310
693
}
311
694
312
695
FD_ZERO(&rfds_all);
313
696
697
/* Read and execute any executable in the plugin directory*/
314
698
while(true){
315
699
dirst = readdir(dir);
316
700
317
// All directory entries have been processed
701
/* All directory entries have been processed */
318
702
if(dirst == NULL){
703
if(errno == EBADF){
704
perror("readdir");
705
exitstatus = EXIT_FAILURE;
706
goto fallback;
707
}
319
708
break;
320
709
}
321
710
322
711
d_name_len = strlen(dirst->d_name);
323
712
324
// Ignore dotfiles, backup files and other junk
713
/* Ignore dotfiles, backup files and other junk */
325
714
{
326
715
bool bad_name = false;
327
716
329
718
330
719
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
331
720
".dpkg-old",
721
".dpkg-bak",
332
722
".dpkg-divert", NULL };
333
723
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
334
724
size_t pre_len = strlen(*pre);
342
732
break;
343
733
}
344
734
}
345
346
735
if(bad_name){
347
736
continue;
348
737
}
349
350
738
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
351
739
size_t suf_len = strlen(*suf);
352
740
if((d_name_len >= suf_len)
365
753
continue;
366
754
}
367
755
}
368
369
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
370
if (filename == NULL){
371
perror("malloc");
372
exitstatus = EXIT_FAILURE;
373
goto end;
374
}
375
strcpy(filename, plugindir); /* Spurious warning */
376
strcat(filename, "/"); /* Spurious warning */
377
strcat(filename, dirst->d_name); /* Spurious warning */
378
379
stat(filename, &st);
380
381
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
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)){
382
777
if(debug){
383
778
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
384
779
" with bad type or mode\n", filename);
386
781
free(filename);
387
782
continue;
388
783
}
389
if(getplugin(dirst->d_name, &plugin_list)->disabled){
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){
390
792
if(debug){
391
793
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
392
794
dirst->d_name);
394
796
free(filename);
395
797
continue;
396
798
}
397
plugin *p = getplugin(dirst->d_name, &plugin_list);
398
799
{
399
800
/* Add global arguments to argument list for this plugin */
400
plugin *g = getplugin(NULL, &plugin_list);
401
for(char **a = g->argv + 1; *a != NULL; a++){
402
addargument(p, *a);
403
}
404
}
405
int pipefd[2];
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];
406
828
ret = pipe(pipefd);
407
if (ret == -1){
829
if(ret == -1){
408
830
perror("pipe");
409
831
exitstatus = EXIT_FAILURE;
410
goto end;
832
goto fallback;
411
833
}
834
/* Ask OS to automatic close the pipe on exec */
412
835
ret = set_cloexec_flag(pipefd[0]);
413
836
if(ret < 0){
414
837
perror("set_cloexec_flag");
415
838
exitstatus = EXIT_FAILURE;
416
goto end;
839
goto fallback;
417
840
}
418
841
ret = set_cloexec_flag(pipefd[1]);
419
842
if(ret < 0){
420
843
perror("set_cloexec_flag");
421
844
exitstatus = EXIT_FAILURE;
422
goto end;
845
goto fallback;
423
846
}
424
847
/* Block SIGCHLD until process is safely in process list */
425
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
848
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
426
849
if(ret < 0){
427
850
perror("sigprocmask");
428
851
exitstatus = EXIT_FAILURE;
429
goto end;
852
goto fallback;
430
853
}
431
// Starting a new process to be watched
854
/* Starting a new process to be watched */
432
855
pid_t pid = fork();
856
if(pid == -1){
857
perror("fork");
858
exitstatus = EXIT_FAILURE;
859
goto fallback;
860
}
433
861
if(pid == 0){
434
862
/* this is the child process */
435
863
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
437
865
perror("sigaction");
438
866
_exit(EXIT_FAILURE);
439
867
}
440
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
868
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
441
869
if(ret < 0){
442
870
perror("sigprocmask");
443
871
_exit(EXIT_FAILURE);
444
872
}
445
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
873
874
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
875
if(ret == -1){
876
perror("dup2");
877
_exit(EXIT_FAILURE);
878
}
446
879
447
880
if(dirfd(dir) < 0){
448
881
/* If dir has no file descriptor, we could not set FD_CLOEXEC
449
882
above and must now close it manually here. */
450
883
closedir(dir);
451
884
}
452
if(execv(filename, p->argv) < 0){
453
perror("execv");
454
_exit(EXIT_FAILURE);
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
}
455
895
}
456
896
/* no return */
457
897
}
458
/* parent process */
898
/* Parent process */
899
close(pipefd[1]); /* Close unused write end of pipe */
459
900
free(filename);
460
close(pipefd[1]); /* close unused write end of pipe */
461
process *new_process = malloc(sizeof(process));
462
if (new_process == NULL){
463
perror("malloc");
464
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
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);
465
905
if(ret < 0){
466
perror("sigprocmask");
906
perror("sigprocmask");
467
907
}
468
908
exitstatus = EXIT_FAILURE;
469
goto end;
909
goto fallback;
470
910
}
471
911
472
*new_process = (struct process){ .pid = pid,
473
.fd = pipefd[0],
474
.next = process_list };
475
// List handling
476
process_list = new_process;
912
new_plugin->pid = pid;
913
new_plugin->fd = pipefd[0];
914
477
915
/* Unblock SIGCHLD so signal handler can be run if this process
478
916
has already completed */
479
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
480
918
if(ret < 0){
481
919
perror("sigprocmask");
482
920
exitstatus = EXIT_FAILURE;
483
goto end;
484
}
485
486
FD_SET(new_process->fd, &rfds_all);
487
488
if (maxfd < new_process->fd){
489
maxfd = new_process->fd;
490
}
491
492
}
493
494
/* Free the plugin list */
495
for(plugin *next; plugin_list != NULL; plugin_list = next){
496
next = plugin_list->next;
497
free(plugin_list->argv);
498
free(plugin_list);
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
}
499
929
}
500
930
501
931
closedir(dir);
502
932
dir = NULL;
933
free_plugin(getplugin(NULL));
503
934
504
if (process_list == NULL){
505
fprintf(stderr, "No plugin processes started, exiting\n");
506
exitstatus = EXIT_FAILURE;
507
goto end;
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
}
508
944
}
509
while(process_list){
945
946
/* Main loop while running plugins exist */
947
while(plugin_list){
510
948
fd_set rfds = rfds_all;
511
949
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
512
if (select_ret == -1){
950
if(select_ret == -1){
513
951
perror("select");
514
952
exitstatus = EXIT_FAILURE;
515
goto end;
953
goto fallback;
516
954
}
517
955
/* OK, now either a process completed, or something can be read
518
956
from one of them */
519
for(process *proc = process_list; proc ; proc = proc->next){
957
for(plugin *proc = plugin_list; proc != NULL;){
520
958
/* Is this process completely done? */
521
if(proc->eof and proc->completed){
959
if(proc->completed and proc->eof){
522
960
/* Only accept the plugin output if it exited cleanly */
523
961
if(not WIFEXITED(proc->status)
524
962
or WEXITSTATUS(proc->status) != 0){
525
963
/* Bad exit by plugin */
964
526
965
if(debug){
527
966
if(WIFEXITED(proc->status)){
528
fprintf(stderr, "Plugin %d exited with status %d\n",
529
proc->pid, WEXITSTATUS(proc->status));
530
} else if(WIFSIGNALED(proc->status)) {
531
fprintf(stderr, "Plugin %d killed by signal %d\n",
532
proc->pid, WTERMSIG(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));
533
976
} else if(WCOREDUMP(proc->status)){
534
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
978
" core\n", proc->name, (intmax_t) (proc->pid));
535
979
}
536
980
}
981
537
982
/* Remove the plugin */
538
983
FD_CLR(proc->fd, &rfds_all);
984
539
985
/* Block signal while modifying process_list */
540
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
541
987
if(ret < 0){
542
988
perror("sigprocmask");
543
989
exitstatus = EXIT_FAILURE;
544
goto end;
545
}
546
/* Delete this process entry from the list */
547
if(process_list == proc){
548
/* First one - simple */
549
process_list = proc->next;
550
} else {
551
/* Second one or later */
552
for(process *p = process_list; p != NULL; p = p->next){
553
if(p->next == proc){
554
p->next = proc->next;
555
break;
556
}
557
}
558
}
990
goto fallback;
991
}
992
993
plugin *next_plugin = proc->next;
994
free_plugin(proc);
995
proc = next_plugin;
996
559
997
/* We are done modifying process list, so unblock signal */
560
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
561
NULL);
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
562
1000
if(ret < 0){
563
1001
perror("sigprocmask");
564
}
565
free(proc->buffer);
566
free(proc);
567
/* We deleted this process from the list, so we can't go
568
proc->next. Therefore, start over from the beginning of
569
the process list */
570
break;
1002
exitstatus = EXIT_FAILURE;
1003
goto fallback;
1004
}
1005
1006
if(plugin_list == NULL){
1007
break;
1008
}
1009
1010
continue;
571
1011
}
1012
572
1013
/* This process exited nicely, so print its buffer */
573
for(size_t written = 0; written < proc->buffer_length;
574
written += (size_t)ret){
575
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
576
proc->buffer + written,
577
proc->buffer_length
578
- written));
579
if(ret < 0){
580
perror("write");
581
exitstatus = EXIT_FAILURE;
582
goto end;
583
}
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;
584
1020
}
585
goto end;
1021
goto fallback;
586
1022
}
1023
587
1024
/* This process has not completed. Does it have any output? */
588
1025
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
589
1026
/* This process had nothing to say at this time */
1027
proc = proc->next;
590
1028
continue;
591
1029
}
592
1030
/* Before reading, make the process' data buffer large enough */
593
1031
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
594
1032
proc->buffer = realloc(proc->buffer, proc->buffer_size
595
1033
+ (size_t) BUFFER_SIZE);
596
if (proc->buffer == NULL){
1034
if(proc->buffer == NULL){
597
1035
perror("malloc");
598
1036
exitstatus = EXIT_FAILURE;
599
goto end;
1037
goto fallback;
600
1038
}
601
1039
proc->buffer_size += BUFFER_SIZE;
602
1040
}
603
1041
/* Read from the process */
604
ret = read(proc->fd, proc->buffer + proc->buffer_length,
605
BUFFER_SIZE);
606
if(ret < 0){
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1044
if(sret < 0){
607
1045
/* Read error from this process; ignore the error */
1046
proc = proc->next;
608
1047
continue;
609
1048
}
610
if(ret == 0){
1049
if(sret == 0){
611
1050
/* got EOF */
612
1051
proc->eof = true;
613
1052
} else {
614
proc->buffer_length += (size_t) ret;
1053
proc->buffer_length += (size_t) sret;
615
1054
}
616
1055
}
617
1056
}
618
if(process_list == NULL){
619
fprintf(stderr, "All plugin processes failed, exiting\n");
620
exitstatus = EXIT_FAILURE;
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
}
621
1078
}
622
1079
623
end:
624
1080
/* Restore old signal handler */
625
sigaction(SIGCHLD, &old_sigchld_action, NULL);
1081
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1082
if(ret == -1){
1083
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1085
}
626
1086
627
/* Free the plugin list */
628
for(plugin *next; plugin_list != NULL; plugin_list = next){
629
next = plugin_list->next;
630
free(plugin_list->argv);
631
free(plugin_list);
1087
if(custom_argv != NULL){
1088
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1089
free(*arg);
1090
}
1091
free(custom_argv);
632
1092
}
633
1093
634
1094
if(dir != NULL){
635
1095
closedir(dir);
636
1096
}
637
1097
638
/* Free the process list and kill the processes */
639
for(process *next; process_list != NULL; process_list = next){
640
next = process_list->next;
641
close(process_list->fd);
642
kill(process_list->pid, SIGTERM);
643
free(process_list->buffer);
644
free(process_list);
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
}
645
1108
}
646
1109
647
1110
/* Wait for any remaining child processes to terminate */
652
1115
perror("wait");
653
1116
}
654
1117
1118
free_plugin_list();
1119
1120
free(plugindir);
1121
free(argfile);
1122
655
1123
return exitstatus;
656
1124
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0