From 999ae6be3243c7b4a815247199447b53c39a3d65 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Mon, 6 May 2024 03:26:58 +0200
Subject: Adding upstream version 1:7.9p1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 regress/limit-keytype.sh | 98 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 regress/limit-keytype.sh

(limited to 'regress/limit-keytype.sh')

diff --git a/regress/limit-keytype.sh b/regress/limit-keytype.sh
new file mode 100644
index 0000000..04f1197
--- /dev/null
+++ b/regress/limit-keytype.sh
@@ -0,0 +1,98 @@
+#	$OpenBSD: limit-keytype.sh,v 1.5 2018/03/12 00:52:57 djm Exp $
+#	Placed in the Public Domain.
+
+tid="restrict pubkey type"
+
+rm -f $OBJ/authorized_keys_$USER $OBJ/user_ca_key* $OBJ/user_key*
+rm -f $OBJ/authorized_principals_$USER $OBJ/cert_user_key*
+
+mv $OBJ/sshd_proxy $OBJ/sshd_proxy.orig
+mv $OBJ/ssh_proxy $OBJ/ssh_proxy.orig
+
+# Create a CA key
+${SSHKEYGEN} -q -N '' -t ed25519  -f $OBJ/user_ca_key ||\
+	fatal "ssh-keygen failed"
+
+# Make some keys and a certificate.
+${SSHKEYGEN} -q -N '' -t ed25519 -f $OBJ/user_key1 || \
+	fatal "ssh-keygen failed"
+${SSHKEYGEN} -q -N '' -t rsa -f $OBJ/user_key2 || \
+	fatal "ssh-keygen failed"
+${SSHKEYGEN} -q -N '' -t rsa -f $OBJ/user_key3 || \
+	fatal "ssh-keygen failed"
+${SSHKEYGEN} -q -N '' -t dsa -f $OBJ/user_key4 || \
+	fatal "ssh-keygen failed"
+${SSHKEYGEN} -q -s $OBJ/user_ca_key -I "regress user key for $USER" \
+	-z $$ -n ${USER},mekmitasdigoat $OBJ/user_key3 ||
+		fatal "couldn't sign user_key1"
+# Copy the private key alongside the cert to allow better control of when
+# it is offered.
+mv $OBJ/user_key3-cert.pub $OBJ/cert_user_key3.pub
+
+grep -v IdentityFile $OBJ/ssh_proxy.orig > $OBJ/ssh_proxy
+
+opts="-oProtocol=2 -F $OBJ/ssh_proxy -oIdentitiesOnly=yes"
+certopts="$opts -i $OBJ/user_key3 -oCertificateFile=$OBJ/cert_user_key3.pub"
+
+echo mekmitasdigoat > $OBJ/authorized_principals_$USER
+cat $OBJ/user_key1.pub > $OBJ/authorized_keys_$USER
+cat $OBJ/user_key2.pub >> $OBJ/authorized_keys_$USER
+
+prepare_config() {
+	(
+		grep -v "Protocol"  $OBJ/sshd_proxy.orig
+		echo "Protocol 2"
+		echo "AuthenticationMethods publickey"
+		echo "TrustedUserCAKeys $OBJ/user_ca_key.pub"
+		echo "AuthorizedPrincipalsFile $OBJ/authorized_principals_%u"
+		for x in "$@" ; do
+			echo "$x"
+		done
+ 	) > $OBJ/sshd_proxy
+}
+
+prepare_config
+
+# Check we can log in with all key types.
+${SSH} $certopts proxy true || fatal "cert failed"
+${SSH} $opts -i $OBJ/user_key1 proxy true || fatal "key1 failed"
+${SSH} $opts -i $OBJ/user_key2 proxy true || fatal "key2 failed"
+
+# Allow plain Ed25519 and RSA. The certificate should fail.
+verbose "allow rsa,ed25519"
+prepare_config \
+	"PubkeyAcceptedKeyTypes rsa-sha2-256,rsa-sha2-512,ssh-rsa,ssh-ed25519"
+${SSH} $certopts proxy true && fatal "cert succeeded"
+${SSH} $opts -i $OBJ/user_key1 proxy true || fatal "key1 failed"
+${SSH} $opts -i $OBJ/user_key2 proxy true || fatal "key2 failed"
+
+# Allow Ed25519 only.
+verbose "allow ed25519"
+prepare_config "PubkeyAcceptedKeyTypes ssh-ed25519"
+${SSH} $certopts proxy true && fatal "cert succeeded"
+${SSH} $opts -i $OBJ/user_key1 proxy true || fatal "key1 failed"
+${SSH} $opts -i $OBJ/user_key2 proxy true && fatal "key2 succeeded"
+
+# Allow all certs. Plain keys should fail.
+verbose "allow cert only"
+prepare_config "PubkeyAcceptedKeyTypes *-cert-v01@openssh.com"
+${SSH} $certopts proxy true || fatal "cert failed"
+${SSH} $opts -i $OBJ/user_key1 proxy true && fatal "key1 succeeded"
+${SSH} $opts -i $OBJ/user_key2 proxy true && fatal "key2 succeeded"
+
+# Allow RSA in main config, Ed25519 for non-existent user.
+verbose "match w/ no match"
+prepare_config "PubkeyAcceptedKeyTypes rsa-sha2-256,rsa-sha2-512,ssh-rsa" \
+	"Match user x$USER" "PubkeyAcceptedKeyTypes +ssh-ed25519"
+${SSH} $certopts proxy true && fatal "cert succeeded"
+${SSH} $opts -i $OBJ/user_key1 proxy true && fatal "key1 succeeded"
+${SSH} $opts -i $OBJ/user_key2 proxy true || fatal "key2 failed"
+
+# Allow only DSA in main config, Ed25519 for user.
+verbose "match w/ matching"
+prepare_config "PubkeyAcceptedKeyTypes ssh-dss" \
+	"Match user $USER" "PubkeyAcceptedKeyTypes +ssh-ed25519"
+${SSH} $certopts proxy true || fatal "cert failed"
+${SSH} $opts -i $OBJ/user_key1 proxy true || fatal "key1 failed"
+${SSH} $opts -i $OBJ/user_key4 proxy true && fatal "key4 succeeded"
+
-- 
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