git: 78d4557a9b6d - main - telnet: Add Support for MIT KRB5 build

The branch main has been updated by cy:

URL: https://cgit.FreeBSD.org/src/commit/?id=78d4557a9b6d13ce6040255ec5f8875db351e9a0

commit 78d4557a9b6d13ce6040255ec5f8875db351e9a0
Author:     Cy Schubert <cy@FreeBSD.org>
AuthorDate: 2025-06-10 20:07:32 +0000
Commit:     Cy Schubert <cy@FreeBSD.org>
CommitDate: 2025-06-16 02:49:36 +0000

    telnet: Add Support for MIT KRB5 build
    
    MIT KRB5 does not support telnet. This is because telnet uses 3DES
    encryption, which requires 3DES encrypted keys in the KDC database.
    As MIT had deprecated and removed 3DES support about a decade ago,
    telnet is not supported.
    
    Sponsored by:           The FreeBSD Foundation
    Reviewed by:            markj
    Differential revision:  https://reviews.freebsd.org/D50785
---
 lib/libtelnet/Makefile  | 3 ++-
 usr.bin/telnet/Makefile | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/libtelnet/Makefile b/lib/libtelnet/Makefile
index 69e63af4e272..6bc2f5a51de0 100644
--- a/lib/libtelnet/Makefile
+++ b/lib/libtelnet/Makefile
@@ -19,7 +19,8 @@ CFLAGS+=	-DENCRYPTION -DAUTHENTICATION -DSRA
 CFLAGS+=	-DOPENSSL_API_COMPAT=0x10100000L
 .endif
 
-.if ${MK_KERBEROS_SUPPORT} != "no"
+.if ${MK_KERBEROS_SUPPORT} != "no" && ${MK_MITKRB5} != "yes"
+# MIT KRB5 deprecated and removed 3DES. Therefore no telnet support.
 SRCS+=		kerberos5.c
 CFLAGS+=	-DKRB5 -DFORWARD -Dnet_write=telnet_net_write
 .endif
diff --git a/usr.bin/telnet/Makefile b/usr.bin/telnet/Makefile
index 930d70faa8ba..9197d44db94c 100644
--- a/usr.bin/telnet/Makefile
+++ b/usr.bin/telnet/Makefile
@@ -30,7 +30,8 @@ CFLAGS+=	-DENCRYPTION -DAUTHENTICATION -DIPSEC
 LIBADD+=	mp crypto ipsec pam
 .endif
 
-.if ${MK_KERBEROS_SUPPORT} != "no"
+.if ${MK_KERBEROS_SUPPORT} != "no" && ${MK_MITKRB5} != "yes"
+# MIT KRB5 deprecated and removed 3DES. Therefore no telnet support.
 CFLAGS+=	-DKRB5 -DFORWARD -Dnet_write=telnet_net_write
 LIBADD+=	krb5 roken
 .endif