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Simpler checking of permissions on private RSA key and other fixes.

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This commit is contained in:
Guus Sliepen 2003-08-08 22:11:54 +00:00
parent 96f5d98fc2
commit 9bde92ce97
6 changed files with 52 additions and 143 deletions
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105
src/conf.c
View file

@ -19,7 +19,7 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id: conf.c,v 1.9.4.74 2003/08/08 14:59:27 guus Exp $
$Id: conf.c,v 1.9.4.75 2003/08/08 22:11:54 guus Exp $
*/
#include "system.h"
@ -424,97 +424,7 @@ bool read_server_config()
return x == 0;
}
bool is_safe_path(const char *file)
{
#if !(defined(HAVE_CYGWIN) || defined(HAVE_MINGW))
char *p;
const char *f;
char x;
struct stat s;
char l[MAXBUFSIZE];
if(*file != '/') {
logger(LOG_ERR, _("`%s' is not an absolute path"), file);
return false;
}
p = strrchr(file, '/');
if(p == file) /* It's in the root */
p++;
x = *p;
*p = '\0';
f = file;
check1:
if(lstat(f, &s) < 0) {
logger(LOG_ERR, _("Couldn't stat `%s': %s"), f, strerror(errno));
return false;
}
if(s.st_uid != geteuid()) {
logger(LOG_ERR, _("`%s' is owned by UID %d instead of %d"),
f, s.st_uid, geteuid());
return false;
}
if(S_ISLNK(s.st_mode)) {
logger(LOG_WARNING, _("Warning: `%s' is a symlink"), f);
if(readlink(f, l, MAXBUFSIZE) < 0) {
logger(LOG_ERR, _("Unable to read symbolic link `%s': %s"), f,
strerror(errno));
return false;
}
f = l;
goto check1;
}
*p = x;
f = file;
check2:
if(lstat(f, &s) < 0 && errno != ENOENT) {
logger(LOG_ERR, _("Couldn't stat `%s': %s"), f, strerror(errno));
return false;
}
if(errno == ENOENT)
return true;
if(s.st_uid != geteuid()) {
logger(LOG_ERR, _("`%s' is owned by UID %d instead of %d"),
f, s.st_uid, geteuid());
return false;
}
if(S_ISLNK(s.st_mode)) {
logger(LOG_WARNING, _("Warning: `%s' is a symlink"), f);
if(readlink(f, l, MAXBUFSIZE) < 0) {
logger(LOG_ERR, _("Unable to read symbolic link `%s': %s"), f,
strerror(errno));
return false;
}
f = l;
goto check2;
}
if(s.st_mode & 0007) {
/* Accessible by others */
logger(LOG_ERR, _("`%s' has unsecure permissions"), f);
return false;
}
#endif
return true;
}
FILE *ask_and_safe_open(const char *filename, const char *what, bool safe, const char *mode)
FILE *ask_and_open(const char *filename, const char *what, const char *mode)
{
FILE *r;
char *directory;
@ -573,17 +483,6 @@ FILE *ask_and_safe_open(const char *filename, const char *what, bool safe, const
return NULL;
}
/* Then check the file for nasty attacks */
if(safe) {
if(!is_safe_path(fn)) { /* Do not permit any directories that are readable or writeable by other users. */
fprintf(stderr, _("The file `%s' (or any of the leading directories) has unsafe permissions.\n"
"I will not create or overwrite this file.\n"), fn);
fclose(r);
free(fn);
return NULL;
}
}
free(fn);
return r;

4
src/conf.h
View file

@ -17,7 +17,7 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id: conf.h,v 1.6.4.42 2003/07/30 21:52:41 guus Exp $
$Id: conf.h,v 1.6.4.43 2003/08/08 22:11:54 guus Exp $
*/
#ifndef __TINC_CONF_H__
@ -57,7 +57,7 @@ extern bool get_config_subnet(const config_t *, struct subnet_t **);
extern int read_config_file(avl_tree_t *, const char *);
extern bool read_server_config(void);
extern FILE *ask_and_safe_open(const char *, const char *, bool, const char *);
extern FILE *ask_and_open(const char *, const char *, const char *);
extern bool is_safe_path(const char *);
#endif /* __TINC_CONF_H__ */

10
src/meta.c
View file

@ -17,7 +17,7 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id: meta.c,v 1.1.2.39 2003/08/08 14:24:09 guus Exp $
$Id: meta.c,v 1.1.2.40 2003/08/08 22:11:54 guus Exp $
*/
#include "system.h"
@ -54,10 +54,10 @@ bool send_meta(connection_t *c, char *buffer, int length)
while(length) {
result = send(c->socket, bufp, length, 0);
if(result <= 0) {
if(!errno || errno == EPIPE)
if(!errno || errno == EPIPE) {
ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Connection closed by %s (%s)"),
c->name, c->hostname);
else if(errno == EINTR)
} else if(errno == EINTR)
continue;
else
logger(LOG_ERR, _("Sending meta data to %s (%s) failed: %s"), c->name,
@ -121,10 +121,10 @@ bool receive_meta(connection_t *c)
lenin = recv(c->socket, c->buffer + c->buflen, MAXBUFSIZE - c->buflen, 0);
if(lenin <= 0) {
if(!lenin || !errno)
if(!lenin || !errno) {
ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Connection closed by %s (%s)"),
c->name, c->hostname);
else if(errno == EINTR)
} else if(errno == EINTR)
return true;
else
logger(LOG_ERR, _("Metadata socket read error for %s (%s): %s"),

48
src/net_setup.c
View file

@ -17,7 +17,7 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id: net_setup.c,v 1.1.2.41 2003/07/30 11:50:45 guus Exp $
$Id: net_setup.c,v 1.1.2.42 2003/08/08 22:11:54 guus Exp $
*/
#include "system.h"
@ -149,6 +149,7 @@ bool read_rsa_private_key(void)
{
FILE *fp;
char *fname, *key;
struct stat s;
cp();
@ -164,32 +165,39 @@ bool read_rsa_private_key(void)
if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
asprintf(&fname, "%s/rsa_key.priv", confbase);
if(is_safe_path(fname)) {
fp = fopen(fname, "r");
if(!fp) {
logger(LOG_ERR, _("Error reading RSA private key file `%s': %s"),
fname, strerror(errno));
free(fname);
return false;
}
fp = fopen(fname, "r");
if(!fp) {
logger(LOG_ERR, _("Error reading RSA private key file `%s': %s"),
fname, strerror(errno));
free(fname);
myself->connection->rsa_key =
PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
fclose(fp);
return false;
}
if(!myself->connection->rsa_key) {
logger(LOG_ERR, _("Reading RSA private key file `%s' failed: %s"),
fname, strerror(errno));
return false;
}
#if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
if(fstat(fileno(fp), &s)) {
logger(LOG_ERR, _("Could not stat RSA private key file `%s': %s'"),
fname, strerror(errno));
free(fname);
return false;
}
return true;
if(s.st_mode & ~0700)
logger(LOG_WARNING, _("Warning: insecure file permissions for RSA private key file `%s'!"), fname);
#endif
myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
fclose(fp);
if(!myself->connection->rsa_key) {
logger(LOG_ERR, _("Reading RSA private key file `%s' failed: %s"),
fname, strerror(errno));
free(fname);
return false;
}
free(fname);
return false;
return true;
}
/*

15
src/process.c
View file

@ -17,7 +17,7 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id: process.c,v 1.1.2.68 2003/08/08 19:56:11 guus Exp $
$Id: process.c,v 1.1.2.69 2003/08/08 22:11:54 guus Exp $
*/
#include "system.h"
@ -359,7 +359,6 @@ bool detach(void)
bool execute_script(const char *name, char **envp)
{
#ifdef HAVE_SYSTEM
pid_t pid;
int status;
struct stat s;
char *scriptname;
@ -394,22 +393,20 @@ bool execute_script(const char *name, char **envp)
if(status != -1) {
if(WIFEXITED(status)) { /* Child exited by itself */
if(WEXITSTATUS(status)) {
logger(LOG_ERR, _("Process %d (%s) exited with non-zero status %d"),
pid, name, WEXITSTATUS(status));
logger(LOG_ERR, _("Script %s exited with non-zero status %d"),
name, WEXITSTATUS(status));
return false;
}
} else if(WIFSIGNALED(status)) { /* Child was killed by a signal */
logger(LOG_ERR, _("Process %d (%s) was killed by signal %d (%s)"), pid,
logger(LOG_ERR, _("Script %s was killed by signal %d (%s)"),
name, WTERMSIG(status), strsignal(WTERMSIG(status)));
return false;
} else { /* Something strange happened */
logger(LOG_ERR, _("Process %d (%s) terminated abnormally"), pid,
name);
logger(LOG_ERR, _("Script %s terminated abnormally"), name);
return false;
}
} else {
logger(LOG_ERR, _("System call `%s' failed: %s"), "system",
strerror(errno));
logger(LOG_ERR, _("System call `%s' failed: %s"), "system", strerror(errno));
return false;
}
#endif

13
src/tincd.c
View file

@ -17,7 +17,7 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id: tincd.c,v 1.10.4.84 2003/08/08 19:45:21 guus Exp $
$Id: tincd.c,v 1.10.4.85 2003/08/08 22:11:54 guus Exp $
*/
#include "system.h"
@ -300,11 +300,16 @@ static bool keygen(int bits)
fprintf(stderr, _("Done.\n"));
asprintf(&filename, "%s/rsa_key.priv", confbase);
f = ask_and_safe_open(filename, _("private RSA key"), true, "a");
f = ask_and_open(filename, _("private RSA key"), "a");
if(!f)
return false;
#ifdef HAVE_FCHMOD
/* Make it unreadable for others. */
fchmod(fileno(f), 0600);
#endif
if(ftell(f))
fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
@ -319,7 +324,7 @@ static bool keygen(int bits)
else
asprintf(&filename, "%s/rsa_key.pub", confbase);
f = ask_and_safe_open(filename, _("public RSA key"), false, "a");
f = ask_and_open(filename, _("public RSA key"), "a");
if(!f)
return false;