From a049d7b097542d785e32041ac8570d57be5b086f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dag-Erling=20Sm=C3=B8rgrav?= <des@FreeBSD.org>
Date: Fri, 8 Apr 2005 11:19:50 +0000
Subject: [PATCH] Revert parts of previous commits and use a temporary variable
 to avoid an invalid type pun.

---
 libexec/rexecd/rexecd.c | 45 ++++++++---------------------------------
 1 file changed, 8 insertions(+), 37 deletions(-)

diff --git a/libexec/rexecd/rexecd.c b/libexec/rexecd/rexecd.c
index 05470ff0f064..b0565283e81e 100644
--- a/libexec/rexecd/rexecd.c
+++ b/libexec/rexecd/rexecd.c
@@ -86,8 +86,6 @@ char	default_shell[] = _PATH_BSHELL;
 static void doit(struct sockaddr *);
 static void getstr(char *, int, const char *);
 static void error(const char *fmt, ...);
-static struct passwd *xgetpwnam(const char *, struct passwd *, char **,
-    size_t *);
 
 int no_uid_0 = 1;
 
@@ -136,10 +134,9 @@ doit(struct sockaddr *fromp)
 {
 	char *cmdbuf, *cp;
 	int maxcmdlen;
-	char userbuf[16], pass[16];
-	struct passwd *pwd, pwd_storage;
-	char *pwdbuf, *user;
-	size_t pwdbuflen;
+	char user[16], pass[16];
+	struct passwd *pwd;
+	const void *item;
 	int fd, r, sd;
 	u_short port;
 	int pv[2], pid, cc, nfds;
@@ -189,22 +186,20 @@ doit(struct sockaddr *fromp)
 		if (connect(sd, fromp, fromp->sa_len) < 0)
 			exit(1);
 	}
-	user = userbuf;
-	getstr(userbuf, sizeof(userbuf), "username");
+	getstr(user, sizeof(user), "username");
 	getstr(pass, sizeof(pass), "password");
 	getstr(cmdbuf, maxcmdlen, "command");
 	(void) alarm(0);
 
-	pwdbuflen = 0;
-	pwdbuf = NULL;
 	if (!pam_ok(pam_start("rexecd", user, &pamc, &pamh)) ||
 	    !pam_ok(pam_set_item(pamh, PAM_RHOST, remote)) ||
 	    !pam_ok(pam_set_item(pamh, PAM_AUTHTOK, pass)) ||
 	    !pam_ok(pam_authenticate(pamh, pam_flags)) ||
 	    !pam_ok(pam_acct_mgmt(pamh, pam_flags)) ||
-	    !pam_ok(pam_get_item(pamh, PAM_USER, (const void **)&user)) ||
-	    (pwd = xgetpwnam(user, &pwd_storage, &pwdbuf,
-	    &pwdbuflen)) == NULL || (pwd->pw_uid == 0 && no_uid_0)) {
+	    !pam_ok(pam_get_item(pamh, PAM_USER, &item)) || item == NULL ||
+	    strlen(item) >= sizeof(user) || strcpy(user, item) == NULL ||
+	    (pwd = getpwnam(user)) == NULL ||
+	    (pwd->pw_uid == 0 && no_uid_0)) {
 		syslog(LOG_ERR, "%s LOGIN REFUSED from %s", user, remote);
 		error("Login incorrect.\n");
 		exit(1);
@@ -329,27 +324,3 @@ getstr(char *buf, int cnt, const char *field)
 		}
 	} while (c != 0);
 }
-
-static struct passwd *
-xgetpwnam(const char *user, struct passwd *pwd_storage, char **pwdbuf,
-    size_t *pwdbuflen)
-{
-	struct passwd *pwd;
-	size_t needed;
-	int rv;
-
-	needed = (*pwdbuflen == 0) ? BUFSIZ : *pwdbuflen;
-	pwd = NULL;
-	do {
-		if (needed != *pwdbuflen) {
-			if ((*pwdbuf = reallocf(*pwdbuf, needed)) == NULL) {
-				syslog(LOG_ERR, "Cannot allocate memory");
-				error("Cannot allocate memory.\n");
-				exit(1);
-			} else
-				*pwdbuflen = needed;
-		}
-		rv = getpwnam_r(user, pwd_storage, *pwdbuf, *pwdbuflen, &pwd);
-	} while (pwd == NULL && rv == ERANGE && (needed <<= 1));
-	return pwd;
-}