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- Committer: Teddy Hogeborn
- Date: 2009-01-14 14:20:17 UTC
- Revision ID: teddy@fukt.bsnet.se-20090114142017-84t4kfw56bsftjlo
Fixes for sscanf usage:
* plugin-runner.c (main): Parse numbers correctly and portably using
an intermediate "intmax_t". Cast "pid_t" to
"intmax_t" before passing it to "printf()".
* plugins.d/mandos-client.c (main): Parse numbers correctly and
portably using an intermediate
"intmax_t". Bug fix: cast
"AvahiIfIndex" to "intmax_t" and
use "PRIdMAX" instead of using
"PRIu16", and use "PRIu16" to
format port number.
* plugins.d/splashy.c (main): Parse numbers correctly and portably
using an intermediate "intmax_t".
* plugins.d/usplash.c (main): - '' -
* plugin-runner.c (main): Parse numbers correctly and portably using
an intermediate "intmax_t". Cast "pid_t" to
"intmax_t" before passing it to "printf()".
* plugins.d/mandos-client.c (main): Parse numbers correctly and
portably using an intermediate
"intmax_t". Bug fix: cast
"AvahiIfIndex" to "intmax_t" and
use "PRIdMAX" instead of using
"PRIu16", and use "PRIu16" to
format port number.
* plugins.d/splashy.c (main): Parse numbers correctly and portably
using an intermediate "intmax_t".
* plugins.d/usplash.c (main): - '' -
- 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> /* strsep, 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
#define CONFFILE "/conf/conf.d/mandos/client.conf"
69
70
const char *argp_program_version = "mandos-client 1.0";
70
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;
71
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
76
73
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;
74
84
75
typedef struct process{
85
/* Variables used for running processes*/
76
86
pid_t pid;
77
87
int fd;
78
88
char *buffer;
79
89
size_t buffer_size;
80
90
size_t buffer_length;
81
91
bool eof;
82
bool completed;
83
int status;
84
struct process *next;
85
} process;
86
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
89
char **argv;
90
int argc;
91
bool disabled;
92
volatile bool completed;
93
volatile int status;
92
94
struct plugin *next;
93
95
} plugin;
94
96
95
static plugin *getplugin(char *name, plugin **plugin_list){
96
for (plugin *p = *plugin_list; p != NULL; p = p->next){
97
if ((p->name == name)
98
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))){
99
106
return p;
100
107
}
101
108
}
102
109
/* Create a new plugin */
103
110
plugin *new_plugin = malloc(sizeof(plugin));
104
if (new_plugin == NULL){
105
perror("malloc");
106
exit(EXIT_FAILURE);
107
}
108
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
109
127
new_plugin->argv = malloc(sizeof(char *) * 2);
110
if (new_plugin->argv == NULL){
111
perror("malloc");
112
exit(EXIT_FAILURE);
128
if(new_plugin->argv == NULL){
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
113
132
}
114
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
115
134
new_plugin->argv[1] = NULL;
116
new_plugin->argc = 1;
117
new_plugin->disabled = false;
118
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
119
145
/* Append the new plugin to the list */
120
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
121
147
return new_plugin;
122
148
}
123
149
124
static void addargument(plugin *p, char *arg){
125
p->argv[p->argc] = arg;
126
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
127
if (p->argv == NULL){
128
perror("malloc");
129
exit(EXIT_FAILURE);
130
}
131
p->argc++;
132
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));
133
204
}
134
205
135
206
/*
137
208
* Descriptor Flags".
138
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
139
210
*/
140
static int set_cloexec_flag(int fd)
141
{
211
static int set_cloexec_flag(int fd){
142
212
int ret = fcntl(fd, F_GETFD, 0);
143
213
/* If reading the flags failed, return error indication now. */
144
214
if(ret < 0){
148
218
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
149
219
}
150
220
151
process *process_list = NULL;
152
221
153
/* Mark a process as completed when it exits, and save its exit
222
/* Mark processes as completed when they exit, and save their exit
154
223
status. */
155
void handle_sigchld(__attribute__((unused)) int sig){
156
process *proc = process_list;
157
int status;
158
pid_t pid = wait(&status);
159
if(pid == -1){
160
perror("wait");
161
return;
162
}
163
while(proc != NULL and proc->pid != pid){
164
proc = proc->next;
165
}
166
if(proc == NULL){
167
/* Process not found in process list */
168
return;
169
}
170
proc->status = status;
171
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
}
172
252
}
173
253
174
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){
175
256
ssize_t ret;
176
if(length>0 and buffer[length-1] == '\n'){
177
length--;
178
}
179
257
for(size_t written = 0; written < length; written += (size_t)ret){
180
258
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
181
259
length - written));
186
264
return true;
187
265
}
188
266
189
char ** addcustomargument(char **argv, int *argc, char *arg){
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);
190
279
191
if (argv == NULL){
192
*argc = 1;
193
argv = malloc(sizeof(char*) * 2);
194
if(argv == NULL){
195
return NULL;
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
}
196
291
}
197
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
198
argv[1] = NULL;
199
}
200
*argc += 1;
201
argv = realloc(argv, sizeof(char *)
202
* ((unsigned int) *argc + 1));
203
if(argv == NULL){
204
return NULL;
205
}
206
argv[*argc-1] = arg;
207
argv[*argc] = NULL;
208
return argv;
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
}
209
301
}
210
302
211
303
int main(int argc, char *argv[]){
212
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
213
const char *conffile = CONFFILE;
304
char *plugindir = NULL;
305
char *argfile = NULL;
214
306
FILE *conffp;
215
307
size_t d_name_len;
216
308
DIR *dir = NULL;
217
309
struct dirent *dirst;
218
310
struct stat st;
219
311
fd_set rfds_all;
220
int ret, maxfd = 0;
312
int ret, numchars, maxfd = 0;
313
ssize_t sret;
314
intmax_t tmpmax;
221
315
uid_t uid = 65534;
222
316
gid_t gid = 65534;
223
317
bool debug = false;
231
325
/* Establish a signal handler */
232
326
sigemptyset(&sigchld_action.sa_mask);
233
327
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
234
if(ret < 0){
328
if(ret == -1){
235
329
perror("sigaddset");
236
exit(EXIT_FAILURE);
330
exitstatus = EXIT_FAILURE;
331
goto fallback;
237
332
}
238
333
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
239
if(ret < 0){
334
if(ret == -1){
240
335
perror("sigaction");
241
exit(EXIT_FAILURE);
336
exitstatus = EXIT_FAILURE;
337
goto fallback;
242
338
}
243
339
244
340
/* The options we understand. */
246
342
{ .name = "global-options", .key = 'g',
247
343
.arg = "OPTION[,OPTION[,...]]",
248
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" },
249
348
{ .name = "options-for", .key = 'o',
250
349
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
251
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" },
252
354
{ .name = "disable", .key = 'd',
253
355
.arg = "PLUGIN",
254
356
.doc = "Disable a specific plugin", .group = 1 },
357
{ .name = "enable", .key = 'e',
358
.arg = "PLUGIN",
359
.doc = "Enable a specific plugin", .group = 1 },
255
360
{ .name = "plugin-dir", .key = 128,
256
361
.arg = "DIRECTORY",
257
362
.doc = "Specify a different plugin directory", .group = 2 },
258
{ .name = "userid", .key = 129,
259
.arg = "ID", .flags = 0,
260
.doc = "User ID the plugins will run as", .group = 2 },
261
{ .name = "groupid", .key = 130,
262
.arg = "ID", .flags = 0,
263
.doc = "Group ID the plugins will run as", .group = 2 },
264
{ .name = "debug", .key = 131,
265
.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 },
266
374
{ .name = NULL }
267
375
};
268
376
269
error_t parse_opt (int key, char *arg, struct argp_state *state) {
270
/* Get the INPUT argument from `argp_parse', which we know is a
271
pointer to our plugin list pointer. */
272
plugin **plugins = state->input;
273
switch (key) {
274
case 'g':
275
if (arg != NULL){
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){
276
382
char *p;
277
383
while((p = strsep(&arg, ",")) != NULL){
278
384
if(p[0] == '\0'){
279
385
continue;
280
386
}
281
addargument(getplugin(NULL, plugins), p);
387
if(not add_argument(getplugin(NULL), p)){
388
perror("add_argument");
389
return ARGP_ERR_UNKNOWN;
390
}
282
391
}
283
392
}
284
393
break;
285
case 'o':
286
if (arg != NULL){
287
char *name = strsep(&arg, ":");
288
if(name[0] == '\0'){
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){
289
406
break;
290
407
}
291
408
char *opt = strsep(&arg, ":");
292
if(opt[0] == '\0'){
293
break;
294
}
295
if(opt != NULL){
296
char *p;
297
while((p = strsep(&opt, ",")) != NULL){
298
if(p[0] == '\0'){
299
continue;
300
}
301
addargument(getplugin(name, plugins), p);
302
}
303
}
304
}
305
break;
306
case 'd':
307
if (arg != NULL){
308
getplugin(arg, plugins)->disabled = true;
309
}
310
break;
311
case 128:
312
plugindir = arg;
313
break;
314
case 129:
315
uid = (uid_t)strtol(arg, NULL, 10);
316
break;
317
case 130:
318
gid = (gid_t)strtol(arg, NULL, 10);
319
break;
320
case 131:
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 */
321
488
debug = true;
322
489
break;
323
case ARGP_KEY_ARG:
324
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
325
break;
326
case ARGP_KEY_END:
327
break;
328
default:
329
return ARGP_ERR_UNKNOWN;
330
}
331
return 0;
332
}
333
334
plugin *plugin_list = NULL;
335
336
struct argp argp = { .options = options, .parser = parse_opt,
337
.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 = "",
338
546
.doc = "Mandos plugin runner -- Run plugins" };
339
547
340
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
341
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){
342
552
fprintf(stderr, "Unknown error while parsing arguments\n");
343
553
exitstatus = EXIT_FAILURE;
344
goto end;
554
goto fallback;
345
555
}
346
347
conffp = fopen(conffile, "r");
556
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
}
348
566
if(conffp != NULL){
349
567
char *org_line = NULL;
568
char *p, *arg, *new_arg, *line;
350
569
size_t size = 0;
351
ssize_t sret;
352
char *p, *arg, *new_arg, *line;
353
570
const char whitespace_delims[] = " \r\t\f\v\n";
354
571
const char comment_delim[] = "#";
355
572
573
custom_argc = 1;
574
custom_argv = malloc(sizeof(char*) * 2);
575
if(custom_argv == NULL){
576
perror("malloc");
577
exitstatus = EXIT_FAILURE;
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 */
356
585
while(true){
357
586
sret = getline(&org_line, &size, conffp);
358
587
if(sret == -1){
366
595
continue;
367
596
}
368
597
new_arg = strdup(p);
369
custom_argv = addcustomargument(custom_argv, &custom_argc, new_arg);
370
if (custom_argv == NULL){
371
perror("addcustomargument");
372
exitstatus = EXIT_FAILURE;
373
goto end;
374
}
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;
375
616
}
376
617
}
377
618
free(org_line);
378
} else{
379
/* check for harmfull errors */
380
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
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){
381
623
perror("fopen");
382
624
exitstatus = EXIT_FAILURE;
383
goto end;
625
goto fallback;
384
626
}
385
627
}
386
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
387
630
if(custom_argv != NULL){
388
custom_argv[0] = argv[0];
389
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
390
if (ret == ARGP_ERR_UNKNOWN){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
391
634
fprintf(stderr, "Unknown error while parsing arguments\n");
392
635
exitstatus = EXIT_FAILURE;
393
goto end;
636
goto fallback;
394
637
}
395
638
}
396
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
397
649
if(debug){
398
650
for(plugin *p = plugin_list; p != NULL; p=p->next){
399
651
fprintf(stderr, "Plugin: %s has %d arguments\n",
401
653
for(char **a = p->argv; *a != NULL; a++){
402
654
fprintf(stderr, "\tArg: %s\n", *a);
403
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
}
404
660
}
405
661
}
406
662
663
/* Strip permissions down to nobody */
407
664
ret = setuid(uid);
408
if (ret == -1){
665
if(ret == -1){
409
666
perror("setuid");
410
}
411
667
}
412
668
setgid(gid);
413
if (ret == -1){
669
if(ret == -1){
414
670
perror("setgid");
415
671
}
416
672
417
dir = opendir(plugindir);
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
677
}
678
418
679
if(dir == NULL){
419
680
perror("Could not open plugin dir");
420
681
exitstatus = EXIT_FAILURE;
421
goto end;
682
goto fallback;
422
683
}
423
684
424
685
/* Set the FD_CLOEXEC flag on the directory, if possible */
429
690
if(ret < 0){
430
691
perror("set_cloexec_flag");
431
692
exitstatus = EXIT_FAILURE;
432
goto end;
693
goto fallback;
433
694
}
434
695
}
435
696
}
436
697
437
698
FD_ZERO(&rfds_all);
438
699
700
/* Read and execute any executable in the plugin directory*/
439
701
while(true){
440
702
dirst = readdir(dir);
441
703
442
// All directory entries have been processed
704
/* All directory entries have been processed */
443
705
if(dirst == NULL){
444
if (errno == EBADF){
706
if(errno == EBADF){
445
707
perror("readdir");
446
708
exitstatus = EXIT_FAILURE;
447
goto end;
709
goto fallback;
448
710
}
449
711
break;
450
712
}
451
713
452
714
d_name_len = strlen(dirst->d_name);
453
715
454
// Ignore dotfiles, backup files and other junk
716
/* Ignore dotfiles, backup files and other junk */
455
717
{
456
718
bool bad_name = false;
457
719
459
721
460
722
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
461
723
".dpkg-old",
724
".dpkg-bak",
462
725
".dpkg-divert", NULL };
463
726
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
464
727
size_t pre_len = strlen(*pre);
472
735
break;
473
736
}
474
737
}
475
476
738
if(bad_name){
477
739
continue;
478
740
}
479
480
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
481
742
size_t suf_len = strlen(*suf);
482
743
if((d_name_len >= suf_len)
495
756
continue;
496
757
}
497
758
}
498
499
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
500
if (filename == NULL){
501
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");
502
768
continue;
503
769
}
504
strcpy(filename, plugindir); /* Spurious warning */
505
strcat(filename, "/"); /* Spurious warning */
506
strcat(filename, dirst->d_name); /* Spurious warning */
507
770
508
771
ret = stat(filename, &st);
509
if (ret == -1){
772
if(ret == -1){
510
773
perror("stat");
511
774
free(filename);
512
775
continue;
513
776
}
514
515
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)){
516
780
if(debug){
517
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
518
782
" with bad type or mode\n", filename);
520
784
free(filename);
521
785
continue;
522
786
}
523
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){
524
795
if(debug){
525
796
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
526
797
dirst->d_name);
528
799
free(filename);
529
800
continue;
530
801
}
531
plugin *p = getplugin(dirst->d_name, &plugin_list);
532
802
{
533
803
/* Add global arguments to argument list for this plugin */
534
plugin *g = getplugin(NULL, &plugin_list);
535
for(char **a = g->argv + 1; *a != NULL; a++){
536
addargument(p, *a);
537
}
538
}
539
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];
540
831
ret = pipe(pipefd);
541
if (ret == -1){
832
if(ret == -1){
542
833
perror("pipe");
543
834
exitstatus = EXIT_FAILURE;
544
goto end;
835
goto fallback;
545
836
}
837
/* Ask OS to automatic close the pipe on exec */
546
838
ret = set_cloexec_flag(pipefd[0]);
547
839
if(ret < 0){
548
840
perror("set_cloexec_flag");
549
841
exitstatus = EXIT_FAILURE;
550
goto end;
842
goto fallback;
551
843
}
552
844
ret = set_cloexec_flag(pipefd[1]);
553
845
if(ret < 0){
554
846
perror("set_cloexec_flag");
555
847
exitstatus = EXIT_FAILURE;
556
goto end;
848
goto fallback;
557
849
}
558
850
/* Block SIGCHLD until process is safely in process list */
559
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
560
852
if(ret < 0){
561
853
perror("sigprocmask");
562
854
exitstatus = EXIT_FAILURE;
563
goto end;
855
goto fallback;
564
856
}
565
// Starting a new process to be watched
857
/* Starting a new process to be watched */
566
858
pid_t pid = fork();
567
859
if(pid == -1){
568
860
perror("fork");
569
861
exitstatus = EXIT_FAILURE;
570
goto end;
862
goto fallback;
571
863
}
572
864
if(pid == 0){
573
865
/* this is the child process */
576
868
perror("sigaction");
577
869
_exit(EXIT_FAILURE);
578
870
}
579
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
580
872
if(ret < 0){
581
873
perror("sigprocmask");
582
874
_exit(EXIT_FAILURE);
583
875
}
584
876
585
877
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
586
878
if(ret == -1){
587
879
perror("dup2");
593
885
above and must now close it manually here. */
594
886
closedir(dir);
595
887
}
596
if(execv(filename, p->argv) < 0){
597
perror("execv");
598
_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
}
599
898
}
600
899
/* no return */
601
900
}
602
/* parent process */
901
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
603
903
free(filename);
604
close(pipefd[1]); /* close unused write end of pipe */
605
process *new_process = malloc(sizeof(process));
606
if (new_process == NULL){
607
perror("malloc");
608
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);
609
908
if(ret < 0){
610
perror("sigprocmask");
909
perror("sigprocmask");
611
910
}
612
911
exitstatus = EXIT_FAILURE;
613
goto end;
912
goto fallback;
614
913
}
615
914
616
*new_process = (struct process){ .pid = pid,
617
.fd = pipefd[0],
618
.next = process_list };
619
// List handling
620
process_list = new_process;
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
917
621
918
/* Unblock SIGCHLD so signal handler can be run if this process
622
919
has already completed */
623
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
624
921
if(ret < 0){
625
922
perror("sigprocmask");
626
923
exitstatus = EXIT_FAILURE;
627
goto end;
628
}
629
630
FD_SET(new_process->fd, &rfds_all);
631
632
if (maxfd < new_process->fd){
633
maxfd = new_process->fd;
634
}
635
636
}
637
638
/* Free the plugin list */
639
for(plugin *next; plugin_list != NULL; plugin_list = next){
640
next = plugin_list->next;
641
free(plugin_list->argv);
642
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
}
643
932
}
644
933
645
934
closedir(dir);
646
935
dir = NULL;
647
648
if (process_list == NULL){
649
fprintf(stderr, "No plugin processes started. Incorrect plugin"
650
" directory?\n");
651
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
}
652
946
}
653
while(process_list){
947
948
/* Main loop while running plugins exist */
949
while(plugin_list){
654
950
fd_set rfds = rfds_all;
655
951
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
656
if (select_ret == -1){
952
if(select_ret == -1){
657
953
perror("select");
658
954
exitstatus = EXIT_FAILURE;
659
goto end;
955
goto fallback;
660
956
}
661
957
/* OK, now either a process completed, or something can be read
662
958
from one of them */
663
for(process *proc = process_list; proc ; proc = proc->next){
959
for(plugin *proc = plugin_list; proc != NULL;){
664
960
/* Is this process completely done? */
665
961
if(proc->eof and proc->completed){
666
962
/* Only accept the plugin output if it exited cleanly */
667
963
if(not WIFEXITED(proc->status)
668
964
or WEXITSTATUS(proc->status) != 0){
669
965
/* Bad exit by plugin */
966
670
967
if(debug){
671
968
if(WIFEXITED(proc->status)){
672
fprintf(stderr, "Plugin %u exited with status %d\n",
673
(unsigned int) (proc->pid),
969
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
970
" %d\n", (intmax_t) (proc->pid),
674
971
WEXITSTATUS(proc->status));
675
972
} else if(WIFSIGNALED(proc->status)) {
676
fprintf(stderr, "Plugin %u killed by signal %d\n",
677
(unsigned int) (proc->pid),
973
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
974
" %d\n", (intmax_t) (proc->pid),
678
975
WTERMSIG(proc->status));
679
976
} else if(WCOREDUMP(proc->status)){
680
fprintf(stderr, "Plugin %d dumped core\n",
681
(unsigned int) (proc->pid));
977
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
978
(intmax_t) (proc->pid));
682
979
}
683
980
}
981
684
982
/* Remove the plugin */
685
983
FD_CLR(proc->fd, &rfds_all);
984
686
985
/* Block signal while modifying process_list */
687
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
688
987
if(ret < 0){
689
988
perror("sigprocmask");
690
989
exitstatus = EXIT_FAILURE;
691
goto end;
692
}
693
/* Delete this process entry from the list */
694
if(process_list == proc){
695
/* First one - simple */
696
process_list = proc->next;
697
} else {
698
/* Second one or later */
699
for(process *p = process_list; p != NULL; p = p->next){
700
if(p->next == proc){
701
p->next = proc->next;
702
break;
703
}
704
}
705
}
990
goto fallback;
991
}
992
993
plugin *next_plugin = proc->next;
994
free_plugin(proc);
995
proc = next_plugin;
996
706
997
/* We are done modifying process list, so unblock signal */
707
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
708
NULL);
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
709
1000
if(ret < 0){
710
1001
perror("sigprocmask");
711
}
712
free(proc->buffer);
713
free(proc);
714
/* We deleted this process from the list, so we can't go
715
proc->next. Therefore, start over from the beginning of
716
the process list */
717
break;
1002
exitstatus = EXIT_FAILURE;
1003
goto fallback;
1004
}
1005
1006
if(plugin_list == NULL){
1007
break;
1008
}
1009
1010
continue;
718
1011
}
1012
719
1013
/* This process exited nicely, so print its buffer */
720
721
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1014
1015
bool bret = print_out_password(proc->buffer,
1016
proc->buffer_length);
722
1017
if(not bret){
723
1018
perror("print_out_password");
724
1019
exitstatus = EXIT_FAILURE;
725
1020
}
726
goto end;
1021
goto fallback;
727
1022
}
1023
728
1024
/* This process has not completed. Does it have any output? */
729
1025
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
730
1026
/* This process had nothing to say at this time */
1027
proc = proc->next;
731
1028
continue;
732
1029
}
733
1030
/* Before reading, make the process' data buffer large enough */
734
1031
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
735
1032
proc->buffer = realloc(proc->buffer, proc->buffer_size
736
1033
+ (size_t) BUFFER_SIZE);
737
if (proc->buffer == NULL){
1034
if(proc->buffer == NULL){
738
1035
perror("malloc");
739
1036
exitstatus = EXIT_FAILURE;
740
goto end;
1037
goto fallback;
741
1038
}
742
1039
proc->buffer_size += BUFFER_SIZE;
743
1040
}
744
1041
/* Read from the process */
745
ret = read(proc->fd, proc->buffer + proc->buffer_length,
746
BUFFER_SIZE);
747
if(ret < 0){
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1044
if(sret < 0){
748
1045
/* Read error from this process; ignore the error */
1046
proc = proc->next;
749
1047
continue;
750
1048
}
751
if(ret == 0){
1049
if(sret == 0){
752
1050
/* got EOF */
753
1051
proc->eof = true;
754
1052
} else {
755
proc->buffer_length += (size_t) ret;
1053
proc->buffer_length += (size_t) sret;
756
1054
}
757
1055
}
758
1056
}
759
1057
760
1058
761
end:
1059
fallback:
762
1060
763
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
764
/* 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 */
765
1064
bool bret;
766
1065
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
767
1066
char *passwordbuffer = getpass("Password: ");
768
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);
769
1074
if(not bret){
770
1075
perror("print_out_password");
771
1076
exitstatus = EXIT_FAILURE;
772
goto end;
773
1077
}
774
1078
}
775
1079
776
1080
/* Restore old signal handler */
777
sigaction(SIGCHLD, &old_sigchld_action, NULL);
778
779
free(custom_argv);
780
781
/* Free the plugin list */
782
for(plugin *next; plugin_list != NULL; plugin_list = next){
783
next = plugin_list->next;
784
free(plugin_list->argv);
785
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);
786
1092
}
787
1093
788
1094
if(dir != NULL){
789
1095
closedir(dir);
790
1096
}
791
1097
792
/* Free the process list and kill the processes */
793
for(process *next; process_list != NULL; process_list = next){
794
next = process_list->next;
795
close(process_list->fd);
796
ret = kill(process_list->pid, SIGTERM);
797
if(ret == -1 and errno != ESRCH){
798
/* set-uid proccesses migth not get closed */
799
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
}
800
1107
}
801
free(process_list->buffer);
802
free(process_list);
803
1108
}
804
1109
805
1110
/* Wait for any remaining child processes to terminate */
810
1115
perror("wait");
811
1116
}
812
1117
1118
free_plugin_list();
1119
1120
free(plugindir);
1121
free(argfile);
1122
813
1123
return exitstatus;
814
1124
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0