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/* Portions taken from the skey distribution on Oct 21 1993 */
#ifdef SKEY
#include <sys/types.h>
#include <netinet/in.h>
#include <string.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <termios.h>
#include <pwd.h>
#include <syslog.h>
#include <skey.h>
/* skey_getpass - read regular or s/key password */
char *skey_getpass(prompt, pwd, pwok)
char *prompt;
struct passwd *pwd;
int pwok;
{
static char buf[128];
struct skey skey;
char *cp;
void rip();
struct termios saved_ttymode;
struct termios noecho_ttymode;
char *username = pwd ? pwd->pw_name : "nope";
int sflag;
/* Attempt an s/key challenge. */
if ((sflag = skeychallenge(&skey, username, buf)) == 0) {
printf("%s\n", buf);
}
if (!pwok) {
printf("(s/key required)\n");
}
fputs(prompt, stdout);
fflush(stdout);
/* Save current input modes and turn echo off. */
tcgetattr(0, &saved_ttymode);
tcgetattr(0, &noecho_ttymode);
noecho_ttymode.c_lflag &= ~ECHO;
tcsetattr(0, TCSANOW, &noecho_ttymode);
/* Read password. */
buf[0] = 0;
fgets(buf, sizeof(buf), stdin);
rip(buf);
/* Restore previous input modes. */
tcsetattr(0, TCSANOW, &saved_ttymode);
/* Give S/Key users a chance to do it with echo on. */
if (sflag == 0 && feof(stdin) == 0 && buf[0] == 0) {
fputs(" (turning echo on)\n", stdout);
fputs(prompt, stdout);
fflush(stdout);
fgets(buf, sizeof(buf), stdin);
rip(buf);
} else {
putchar('\n');
}
return (buf);
}
/* skey_crypt - return encrypted UNIX passwd if s/key or regular password ok */
char *skey_crypt(pp, salt, pwd, pwok)
char *pp;
char *salt;
struct passwd *pwd;
int pwok;
{
struct skey skey;
char *p;
char *crypt();
/* Try s/key authentication even when the UNIX password is permitted. */
if (pwd != 0 && skeylookup(&skey, pwd->pw_name) == 0
&& skeyverify(&skey, pp) == 0) {
/* s/key authentication succeeded */
if (skey.n < 5)
printf("Warning! Change s/key password soon\n");
return (pwd->pw_passwd);
}
/* When s/key authentication does not work, always invoke crypt(). */
p = crypt(pp, salt);
if (pwok && pwd != 0 && strcmp(p, pwd->pw_passwd) == 0)
return (pwd->pw_passwd);
/* The user does not exist or entered bad input. */
return (":");
}
#endif SKEY
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