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Remove the use of random(3), and encapsulate the salt-generation in

Browse source 
its own function. The use of arc4random(3) is hopeless overkill here,
but that does not hurt anything.

Requested by:	ache
This commit is contained in:
Mark Murray 2002-03-14 16:41:36 +00:00
parent 7d0babda6d
commit 8c3ea588df
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=92274
1 changed files with 33 additions and 30 deletions
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63
lib/libpam/modules/pam_unix/pam_unix.c
View file

@ -84,9 +84,14 @@ __FBSDID("$FreeBSD$");
#define PASSWORD_HASH "md5"
#define DEFAULT_WARN (2L * 7L * 86400L) /* Two weeks */
#define MAX_TRIES 3
#define SALTSIZE 32
static char password_prompt_def[] = PASSWORD_PROMPT;
static char password_hash[] = PASSWORD_HASH;
static void makesalt(char []);
static char password_prompt_def[] = PASSWORD_PROMPT;
static char password_hash[] = PASSWORD_HASH;
static char blank[] = "";
static char colon[] = ":";
enum {
PAM_OPT_AUTH_AS_SELF = PAM_OPT_STD_MAX,
@ -169,7 +174,7 @@ pam_sm_authenticate(pam_handle_t *pamh, int flags __unused, int argc, const char
}
encrypted = crypt(pass, pwd->pw_passwd);
if (pass[0] == '\0' && pwd->pw_passwd[0] != '\0')
encrypted = strdup(":");
encrypted = colon;
PAM_LOG("Encrypted password 1 is: %s", encrypted);
PAM_LOG("Encrypted password 2 is: %s", pwd->pw_passwd);
@ -411,7 +416,7 @@ pam_sm_chauthtok(pam_handle_t *pamh, int flags, int argc, const char **argv)
}
encrypted = crypt(pass, pwd->pw_passwd);
if (pass[0] == '\0' && pwd->pw_passwd[0] != '\0')
encrypted = strdup(":");
encrypted = colon;
PAM_LOG("Encrypted password 1 is: %s", encrypted);
PAM_LOG("Encrypted password 2 is: %s", pwd->pw_passwd);
@ -452,7 +457,7 @@ pam_sm_chauthtok(pam_handle_t *pamh, int flags, int argc, const char **argv)
&new_pass, "%s", NEW_PASSWORD_PROMPT_1);
if (new_pass == NULL)
new_pass = strdup("");
new_pass = blank;
if (retval == PAM_SUCCESS) {
new_pass_ = NULL;
@ -460,7 +465,7 @@ pam_sm_chauthtok(pam_handle_t *pamh, int flags, int argc, const char **argv)
&new_pass_, "%s", NEW_PASSWORD_PROMPT_2);
if (new_pass_ == NULL)
new_pass_ = strdup("");
new_pass_ = blank;
if (retval == PAM_SUCCESS) {
if (strcmp(new_pass, new_pass_) == 0) {
@ -550,7 +555,7 @@ local_passwd(const char *user, const char *pass)
struct passwd *pwd;
struct timeval tv;
int pfd, tfd;
char *crypt_type, salt[32];
char *crypt_type, salt[SALTSIZE + 1];
pwd = getpwnam(user);
if (pwd == NULL)
@ -568,17 +573,7 @@ local_passwd(const char *user, const char *pass)
if (login_setcryptfmt(lc, crypt_type, NULL) == NULL)
syslog(LOG_ERR, "cannot set password cipher");
login_close(lc);
/* Salt suitable for anything */
gettimeofday(&tv, 0);
to64(&salt[0], (tv.tv_sec ^ random()) * tv.tv_usec, 3);
to64(&salt[3], (getpid() ^ random()) * tv.tv_usec, 2);
to64(&salt[5], (getppid() ^ random()) * tv.tv_usec, 3);
to64(&salt[8], (getuid() ^ random()) * tv.tv_usec, 5);
to64(&salt[13], (getgid() ^ random()) * tv.tv_usec, 5);
to64(&salt[17], random() * tv.tv_usec, 5);
to64(&salt[22], random() * tv.tv_usec, 5);
salt[27] = '\0';
makesalt(salt);
pwd->pw_passwd = crypt(pass, salt);
pfd = pw_lock();
@ -608,8 +603,10 @@ yp_passwd(const char *user __unused, const char *pass)
CLIENT *clnt;
login_cap_t *lc;
int *status;
uid_t uid;
char *master, sockname[] = YP_SOCKNAME, salt[32];
gid_t gid;
pid_t pid;
uid_t uid;
char *master, sockname[] = YP_SOCKNAME, salt[SALTSIZE + 1];
_use_yp = 1;
@ -661,17 +658,8 @@ yp_passwd(const char *user __unused, const char *pass)
if (login_setcryptfmt(lc, "md5", NULL) == NULL)
syslog(LOG_ERR, "cannot set password cipher");
login_close(lc);
/* Salt suitable for anything */
gettimeofday(&tv, 0);
to64(&salt[0], (tv.tv_sec ^ random()) * tv.tv_usec, 3);
to64(&salt[3], (getpid() ^ random()) * tv.tv_usec, 2);
to64(&salt[5], (getppid() ^ random()) * tv.tv_usec, 3);
to64(&salt[8], (getuid() ^ random()) * tv.tv_usec, 5);
to64(&salt[13], (getgid() ^ random()) * tv.tv_usec, 5);
to64(&salt[17], random() * tv.tv_usec, 5);
to64(&salt[22], random() * tv.tv_usec, 5);
salt[27] = '\0';
makesalt(salt);
if (suser_override)
master_yppwd.newpw.pw_passwd = crypt(pass, salt);
else
@ -721,4 +709,19 @@ yp_passwd(const char *user __unused, const char *pass)
}
#endif /* YP */
/* Salt suitable for traditional DES and MD5 */
void
makesalt(char salt[SALTSIZE])
{
int i;
/* These are not really random numbers, they are just
* numbers that change to thwart construction of a
* dictionary. This is exposed to the public.
*/
for (i = 0; i < SALTSIZE; i += 4)
to64(&salt[i], arc4random(), 4);
salt[SALTSIZE] = '\0';
}
PAM_MODULE_ENTRY("pam_unix");