From: Marco d'Itri <md@linux.it>
Date: Fri, 2 Jun 2017 11:27:15 +0200
Subject: [PATCH] no_crypt_hack

The udeb package does not have crypt(3).  This patch makes
authentication always fail, since it is not needed anyway for dialout.
---
 pppd/Makefile.linux | 4 ++++
 pppd/auth.c         | 2 ++
 pppd/session.c      | 2 ++
 3 files changed, 8 insertions(+)

diff --git a/pppd/Makefile.linux b/pppd/Makefile.linux
index 16b3ee879791..a8694fccd85e 100644
--- a/pppd/Makefile.linux
+++ b/pppd/Makefile.linux
@@ -121,10 +121,14 @@ CFLAGS   += -DHAS_SHADOW
 #LIBS     += -lshadow $(LIBS)
 endif
 
+ifdef NO_CRYPT_HACK
+CFLAGS += -DNO_CRYPT_HACK
+else
 ifneq ($(wildcard /usr/include/crypt.h),)
 CFLAGS  += -DHAVE_CRYPT_H=1
 LIBS	+= -lcrypt
 endif
+endif
 
 ifdef USE_LIBUTIL
 CFLAGS	+= -DHAVE_LOGWTMP=1
diff --git a/pppd/auth.c b/pppd/auth.c
index 4271af687102..931c6b45043b 100644
--- a/pppd/auth.c
+++ b/pppd/auth.c
@@ -1442,8 +1442,10 @@ check_passwd(unit, auser, userlen, apasswd, passwdlen, msg)
 	    if (secret[0] != 0 && !login_secret) {
 		/* password given in pap-secrets - must match */
 		if (cryptpap || strcmp(passwd, secret) != 0) {
+#ifndef NO_CRYPT_HACK
 		    char *cbuf = crypt(passwd, secret);
 		    if (!cbuf || strcmp(cbuf, secret) != 0)
+#endif
 			ret = UPAP_AUTHNAK;
 		}
 	    }
diff --git a/pppd/session.c b/pppd/session.c
index 56385dd63874..977139665218 100644
--- a/pppd/session.c
+++ b/pppd/session.c
@@ -351,8 +351,10 @@ session_start(flags, user, passwd, ttyName, msg)
 	 */
         if (pw->pw_passwd == NULL || strlen(pw->pw_passwd) < 2)
             return SESSION_FAILED;
+#ifndef NO_CRYPT_HACK
 	cbuf = crypt(passwd, pw->pw_passwd);
 	if (!cbuf || strcmp(cbuf, pw->pw_passwd) != 0)
+#endif
             return SESSION_FAILED;
     }