| limit-keytype.sh (294333) | limit-keytype.sh (296633) |
|---|---|
| 1# $OpenBSD: limit-keytype.sh,v 1.1 2015/01/13 07:49:49 djm Exp $ | 1# $OpenBSD: limit-keytype.sh,v 1.4 2015/10/29 08:05:17 djm Exp $ |
| 2# Placed in the Public Domain. 3 4tid="restrict pubkey type" 5 6rm -f $OBJ/authorized_keys_$USER $OBJ/user_ca_key* $OBJ/user_key* 7rm -f $OBJ/authorized_principals_$USER $OBJ/cert_user_key* 8 9mv $OBJ/sshd_proxy $OBJ/sshd_proxy.orig --- 5 unchanged lines hidden (view full) --- 15 16# Make some keys and a certificate. 17${SSHKEYGEN} -q -N '' -t ed25519 -f $OBJ/user_key1 || \ 18 fatal "ssh-keygen failed" 19${SSHKEYGEN} -q -N '' -t rsa -f $OBJ/user_key2 || \ 20 fatal "ssh-keygen failed" 21${SSHKEYGEN} -q -N '' -t rsa -f $OBJ/user_key3 || \ 22 fatal "ssh-keygen failed" | 2# Placed in the Public Domain. 3 4tid="restrict pubkey type" 5 6rm -f $OBJ/authorized_keys_$USER $OBJ/user_ca_key* $OBJ/user_key* 7rm -f $OBJ/authorized_principals_$USER $OBJ/cert_user_key* 8 9mv $OBJ/sshd_proxy $OBJ/sshd_proxy.orig --- 5 unchanged lines hidden (view full) --- 15 16# Make some keys and a certificate. 17${SSHKEYGEN} -q -N '' -t ed25519 -f $OBJ/user_key1 || \ 18 fatal "ssh-keygen failed" 19${SSHKEYGEN} -q -N '' -t rsa -f $OBJ/user_key2 || \ 20 fatal "ssh-keygen failed" 21${SSHKEYGEN} -q -N '' -t rsa -f $OBJ/user_key3 || \ 22 fatal "ssh-keygen failed" |
| 23${SSHKEYGEN} -q -N '' -t dsa -f $OBJ/user_key4 || \ 24 fatal "ssh-keygen failed" |
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| 23${SSHKEYGEN} -q -s $OBJ/user_ca_key -I "regress user key for $USER" \ 24 -z $$ -n ${USER},mekmitasdigoat $OBJ/user_key3 || 25 fatal "couldn't sign user_key1" 26# Copy the private key alongside the cert to allow better control of when 27# it is offered. 28mv $OBJ/user_key3-cert.pub $OBJ/cert_user_key3.pub | 25${SSHKEYGEN} -q -s $OBJ/user_ca_key -I "regress user key for $USER" \ 26 -z $$ -n ${USER},mekmitasdigoat $OBJ/user_key3 || 27 fatal "couldn't sign user_key1" 28# Copy the private key alongside the cert to allow better control of when 29# it is offered. 30mv $OBJ/user_key3-cert.pub $OBJ/cert_user_key3.pub |
| 29cp -p $OBJ/user_key3 $OBJ/cert_user_key3 | |
| 30 31grep -v IdentityFile $OBJ/ssh_proxy.orig > $OBJ/ssh_proxy 32 33opts="-oProtocol=2 -F $OBJ/ssh_proxy -oIdentitiesOnly=yes" | 31 32grep -v IdentityFile $OBJ/ssh_proxy.orig > $OBJ/ssh_proxy 33 34opts="-oProtocol=2 -F $OBJ/ssh_proxy -oIdentitiesOnly=yes" |
| 34fullopts="$opts -i $OBJ/cert_user_key3 -i $OBJ/user_key1 -i $OBJ/user_key2" | 35certopts="$opts -i $OBJ/user_key3 -oCertificateFile=$OBJ/cert_user_key3.pub" |
| 35 36echo mekmitasdigoat > $OBJ/authorized_principals_$USER 37cat $OBJ/user_key1.pub > $OBJ/authorized_keys_$USER 38cat $OBJ/user_key2.pub >> $OBJ/authorized_keys_$USER 39 40prepare_config() { 41 ( 42 grep -v "Protocol" $OBJ/sshd_proxy.orig --- 5 unchanged lines hidden (view full) --- 48 echo "$x" 49 done 50 ) > $OBJ/sshd_proxy 51} 52 53prepare_config 54 55# Check we can log in with all key types. | 36 37echo mekmitasdigoat > $OBJ/authorized_principals_$USER 38cat $OBJ/user_key1.pub > $OBJ/authorized_keys_$USER 39cat $OBJ/user_key2.pub >> $OBJ/authorized_keys_$USER 40 41prepare_config() { 42 ( 43 grep -v "Protocol" $OBJ/sshd_proxy.orig --- 5 unchanged lines hidden (view full) --- 49 echo "$x" 50 done 51 ) > $OBJ/sshd_proxy 52} 53 54prepare_config 55 56# Check we can log in with all key types. |
| 56${SSH} $opts -i $OBJ/cert_user_key3 proxy true || fatal "cert failed" | 57${SSH} $certopts proxy true || fatal "cert failed" |
| 57${SSH} $opts -i $OBJ/user_key1 proxy true || fatal "key1 failed" 58${SSH} $opts -i $OBJ/user_key2 proxy true || fatal "key2 failed" 59 60# Allow plain Ed25519 and RSA. The certificate should fail. | 58${SSH} $opts -i $OBJ/user_key1 proxy true || fatal "key1 failed" 59${SSH} $opts -i $OBJ/user_key2 proxy true || fatal "key2 failed" 60 61# Allow plain Ed25519 and RSA. The certificate should fail. |
| 61verbose "privsep=$privsep allow rsa,ed25519" | 62verbose "allow rsa,ed25519" |
| 62prepare_config "PubkeyAcceptedKeyTypes ssh-rsa,ssh-ed25519" | 63prepare_config "PubkeyAcceptedKeyTypes ssh-rsa,ssh-ed25519" |
| 63${SSH} $opts -i $OBJ/cert_user_key3 proxy true && fatal "cert succeeded" | 64${SSH} $certopts proxy true && fatal "cert succeeded" |
| 64${SSH} $opts -i $OBJ/user_key1 proxy true || fatal "key1 failed" 65${SSH} $opts -i $OBJ/user_key2 proxy true || fatal "key2 failed" 66 67# Allow Ed25519 only. | 65${SSH} $opts -i $OBJ/user_key1 proxy true || fatal "key1 failed" 66${SSH} $opts -i $OBJ/user_key2 proxy true || fatal "key2 failed" 67 68# Allow Ed25519 only. |
| 68verbose "privsep=$privsep allow ed25519" | 69verbose "allow ed25519" |
| 69prepare_config "PubkeyAcceptedKeyTypes ssh-ed25519" | 70prepare_config "PubkeyAcceptedKeyTypes ssh-ed25519" |
| 70${SSH} $opts -i $OBJ/cert_user_key3 proxy true && fatal "cert succeeded" | 71${SSH} $certopts proxy true && fatal "cert succeeded" |
| 71${SSH} $opts -i $OBJ/user_key1 proxy true || fatal "key1 failed" 72${SSH} $opts -i $OBJ/user_key2 proxy true && fatal "key2 succeeded" 73 74# Allow all certs. Plain keys should fail. | 72${SSH} $opts -i $OBJ/user_key1 proxy true || fatal "key1 failed" 73${SSH} $opts -i $OBJ/user_key2 proxy true && fatal "key2 succeeded" 74 75# Allow all certs. Plain keys should fail. |
| 75verbose "privsep=$privsep allow cert only" | 76verbose "allow cert only" |
| 76prepare_config "PubkeyAcceptedKeyTypes ssh-*-cert-v01@openssh.com" | 77prepare_config "PubkeyAcceptedKeyTypes ssh-*-cert-v01@openssh.com" |
| 77${SSH} $opts -i $OBJ/cert_user_key3 proxy true || fatal "cert failed" | 78${SSH} $certopts proxy true || fatal "cert failed" |
| 78${SSH} $opts -i $OBJ/user_key1 proxy true && fatal "key1 succeeded" 79${SSH} $opts -i $OBJ/user_key2 proxy true && fatal "key2 succeeded" 80 | 79${SSH} $opts -i $OBJ/user_key1 proxy true && fatal "key1 succeeded" 80${SSH} $opts -i $OBJ/user_key2 proxy true && fatal "key2 succeeded" 81 |
| 82# Allow RSA in main config, Ed25519 for non-existent user. 83verbose "match w/ no match" 84prepare_config "PubkeyAcceptedKeyTypes ssh-rsa" \ 85 "Match user x$USER" "PubkeyAcceptedKeyTypes +ssh-ed25519" 86${SSH} $certopts proxy true && fatal "cert succeeded" 87${SSH} $opts -i $OBJ/user_key1 proxy true && fatal "key1 succeeded" 88${SSH} $opts -i $OBJ/user_key2 proxy true || fatal "key2 failed" 89 90# Allow only DSA in main config, Ed25519 for user. 91verbose "match w/ matching" 92prepare_config "PubkeyAcceptedKeyTypes ssh-dss" \ 93 "Match user $USER" "PubkeyAcceptedKeyTypes +ssh-ed25519" 94${SSH} $certopts proxy true || fatal "cert failed" 95${SSH} $opts -i $OBJ/user_key1 proxy true || fatal "key1 failed" 96${SSH} $opts -i $OBJ/user_key4 proxy true && fatal "key4 succeeded" 97 |
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