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|
X509_SHA256="$(doveconf -c "$HOME_remote/.dovecot/config" -hx ssl_cert \
| openssl x509 -in /dev/stdin -noout -fingerprint -sha256 \
| sed -rn "/^.*=\\s*/ {s///p;q}" | tr -d : | tr "[A-Z]" "[a-z]")"
PKEY_SHA256="$(doveconf -c "$HOME_remote/.dovecot/config" -hx ssl_cert \
| openssl x509 -in /dev/stdin -pubkey \
| openssl pkey -in /dev/stdin -pubin -outform DER \
| openssl dgst -sha256 | sed -rn "/^.*=\\s*/ {s///p;q}")"
unverified_peer() {
! interimap --debug || error
# make sure we aborted the handshake immediately after connecting
grep -Fx "remote: Peer certificate fingerprint: sha256\$$X509_SHA256" <"$STDERR" || error
grep -Fx "remote: ERROR: Can't initiate TLS/SSL handshake" <"$STDERR" || error
sed -nr "s/remote: \[[0-9]+\] (preverify=[0-9]+)$/\1/p" <"$STDERR" >"$TMPDIR/preverify"
[ -s "$TMPDIR/preverify" ] || error
! grep -Fvx "preverify=0" <"$TMPDIR/preverify" || error
# make sure we didn't send any credentials or started speaking IMAP
! grep -E "^remote: C: .* (AUTHENTICATE|LOGIN) " <"$STDERR" || error
grep -Fx "remote: IMAP traffic (bytes): recv 0 sent 0" <"$STDERR" || error
}
verified_peer() {
local i u
for ((i = 0; i < 4; i++)); do
u="$(shuf -n1 -e "local" "remote")"
sample_message | deliver -u "$u"
done
interimap --debug || error
grep -Fx "remote: Peer certificate fingerprint: sha256\$$X509_SHA256" <"$STDERR" || error
sed -nr "s/remote: \[[0-9]+\] (preverify=[0-9]+)$/\1/p" <"$STDERR" >"$TMPDIR/preverify"
[ -s "$TMPDIR/preverify" ] || error
! grep -Fvx "preverify=1" <"$TMPDIR/preverify" || error
grep "^remote: SSL protocol: TLSv" <"$STDERR" || error
grep "^remote: SSL cipher: " <"$STDERR" || error
check_mailbox_status "INBOX"
}
# backup config
install -m0600 -- "$XDG_CONFIG_HOME/interimap/config" "$XDG_CONFIG_HOME/interimap/config~"
with_remote_config() {
install -m0600 -- "$XDG_CONFIG_HOME/interimap/config~" "$XDG_CONFIG_HOME/interimap/config"
cat >>"$XDG_CONFIG_HOME/interimap/config"
}
step_start "peer verification enabled by default"
# assume our fake root CA is not among OpenSSL's default trusted CAs
unverified_peer
grep -Fx "remote: Using default locations for trusted CA certificates" <"$STDERR" || error
step_done
step_start "peer verification result honored when pinned pubkey matches"
with_remote_config <<-EOF
SSL_fingerprint = sha256\$$PKEY_SHA256
EOF
unverified_peer
grep -Fx "remote: Using default locations for trusted CA certificates" <"$STDERR" || error
grep -Fx "remote: Peer certificate matches pinned SPKI digest sha256\$$PKEY_SHA256" <"$STDERR" || error
step_done
capath=$(mktemp --tmpdir="$TMPDIR" --directory capath.XXXXXX)
cp -T -- ~/.dovecot/conf.d/ca.crt "$capath/ca-certificates.crt"
step_start "SSL_CAfile/\$SSL_CERT_FILE"
# verify that an error is raised when CAfile can't be loaded
# (it's not the case for $SSL_CERT_FILE, cf. SSL_CTX_load_verify_locations(3ssl))
with_remote_config <<<"SSL_CAfile = /nonexistent"
! interimap --debug || error
grep -Fx "remote: ERROR: SSL_CTX_load_verify_locations()" <"$STDERR" || error
grep -Fx "remote: IMAP traffic (bytes): recv 0 sent 0" <"$STDERR" || error
if [ -f "/etc/ssl/certs/ca-certificates.crt" ]; then
# assume our fake root CA is not there
with_remote_config <<<"SSL_CAfile = /etc/ssl/certs/ca-certificates.crt"
unverified_peer
fi
# default host (localhost) is the CN (and also subjectAltName)
with_remote_config <<<"SSL_CAfile = $capath/ca-certificates.crt"
verified_peer
with_remote_config </dev/null
SSL_CERT_FILE=~/.dovecot/conf.d/ca.crt verified_peer
grep -Fx "remote: Using default locations for trusted CA certificates" <"$STDERR" || error
# hostnames and IPs included in the subjectAltName should work as well
for host in "ip6-localhost" "127.0.0.1" "::1"; do
with_remote_config <<-EOF
host = $host
SSL_CAfile = $capath/ca-certificates.crt
EOF
verified_peer
done
# but not for other hostnames or IPs
for host in "ip6-loopback" "127.0.1.1"; do
with_remote_config <<-EOF
host = $host
SSL_CAfile = $capath/ca-certificates.crt
EOF
unverified_peer
done
step_done
step_start "SSL_CApath/\$SSL_CERT_DIR"
if [ -d "/etc/ssl/certs" ]; then
# assume our fake root CA is not there
with_remote_config <<<"SSL_CApath = /etc/ssl/certs"
unverified_peer
fi
c_rehash "$capath"
# default host (localhost) is the CN (and also subjectAltName)
with_remote_config <<<"SSL_CApath = $capath"
verified_peer
with_remote_config </dev/null
SSL_CERT_DIR="$capath" verified_peer
grep -Fx "remote: Using default locations for trusted CA certificates" <"$STDERR" || error
# hostnames and IPs included in the subjectAltName should work as well
for host in "ip6-localhost" "127.0.0.1" "::1"; do
with_remote_config <<-EOF
host = $host
SSL_CApath = $capath
EOF
verified_peer
done
# but not for other IPs or hostnames
for host in "ip6-loopback" "127.0.1.1"; do
with_remote_config <<-EOF
host = $host
SSL_CApath = $capath
EOF
unverified_peer
done
step_done
# vim: set filetype=bash :
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