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functions.sh
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#!/bin/bash
log_f() {
if [[ ${2} == "no_nl" ]]; then
echo -n "$(date) - ${1}"
elif [[ ${2} == "no_date" ]]; then
echo "${1}"
elif [[ ${2} != "redis_only" ]]; then
echo "$(date) - ${1}"
fi
if [[ ${3} == "b64" ]]; then
${REDIS_CMDLINE} LPUSH ACME_LOG "{\"time\":\"$(date +%s)\",\"message\":\"base64,$(printf '%s' "${MAILCOW_HOSTNAME} - ${1}")\"}" > /dev/null
else
${REDIS_CMDLINE} LPUSH ACME_LOG "{\"time\":\"$(date +%s)\",\"message\":\"$(printf '%s' "${MAILCOW_HOSTNAME} - ${1}" | \
tr '%&;$"[]{}-\r\n' ' ')\"}" > /dev/null
fi
}
verify_email(){
regex="^(([A-Za-z0-9]+((\.|\-|\_|\+)?[A-Za-z0-9]?)*[A-Za-z0-9]+)|[A-Za-z0-9]+)@(([A-Za-z0-9]+)+((\.|\-|\_)?([A-Za-z0-9]+)+)*)+\.([A-Za-z]{2,})+$"
if [[ $1 =~ ${regex} ]]; then
return 0
else
return 1
fi
}
verify_hash_match(){
CERT_HASH=$(openssl x509 -in "${1}" -noout -pubkey | openssl md5)
KEY_HASH=$(openssl pkey -in "${2}" -pubout | openssl md5)
if [[ ${CERT_HASH} != ${KEY_HASH} ]]; then
log_f "Certificate and key hashes do not match!"
return 1
else
log_f "Verified hashes."
return 0
fi
}
get_ipv4(){
local IPV4=
local IPV4_SRCS=
local TRY=
IPV4_SRCS[0]="ip4.mailcow.email"
IPV4_SRCS[1]="ip4.nevondo.com"
until [[ ! -z ${IPV4} ]] || [[ ${TRY} -ge 10 ]]; do
IPV4=$(curl --connect-timeout 3 -m 10 -L4s ${IPV4_SRCS[$RANDOM % ${#IPV4_SRCS[@]} ]} | grep -E "^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$")
[[ ! -z ${TRY} ]] && sleep 1
TRY=$((TRY+1))
done
echo ${IPV4}
}
get_ipv6(){
local IPV6=
local IPV6_SRCS=
local TRY=
IPV6_SRCS[0]="ip6.mailcow.email"
IPV6_SRCS[1]="ip6.nevondo.com"
until [[ ! -z ${IPV6} ]] || [[ ${TRY} -ge 10 ]]; do
IPV6=$(curl --connect-timeout 3 -m 10 -L6s ${IPV6_SRCS[$RANDOM % ${#IPV6_SRCS[@]} ]} | grep "^\([0-9a-fA-F]\{0,4\}:\)\{1,7\}[0-9a-fA-F]\{0,4\}$")
[[ ! -z ${TRY} ]] && sleep 1
TRY=$((TRY+1))
done
echo ${IPV6}
}
check_domain(){
DOMAIN=$1
A_DOMAIN=$(dig A ${DOMAIN} +short | tail -n 1)
AAAA_DOMAIN=$(dig AAAA ${DOMAIN} +short | tail -n 1)
# Hard-fail on CAA errors for MAILCOW_HOSTNAME
PARENT_DOMAIN=$(echo ${DOMAIN} | cut -d. -f2-)
CAAS=( $(dig CAA ${PARENT_DOMAIN} +short | sed -n 's/\d issue "\(.*\)"/\1/p') )
if [[ ! -z ${CAAS} ]]; then
if [[ ${CAAS[@]} =~ "letsencrypt.org" ]]; then
log_f "Validated CAA for parent domain ${PARENT_DOMAIN}"
else
log_f "Lets Encrypt disallowed for ${PARENT_DOMAIN} by CAA record"
return 1
fi
fi
# Check if CNAME without v6 enabled target
if [[ ! -z ${AAAA_DOMAIN} ]] && [[ -z $(echo ${AAAA_DOMAIN} | grep "^\([0-9a-fA-F]\{0,4\}:\)\{1,7\}[0-9a-fA-F]\{0,4\}$") ]]; then
AAAA_DOMAIN=
fi
if [[ ! -z ${AAAA_DOMAIN} ]]; then
log_f "Found AAAA record for ${DOMAIN}: ${AAAA_DOMAIN} - skipping A record check"
if [[ $(expand ${IPV6:-"0000:0000:0000:0000:0000:0000:0000:0000"}) == $(expand ${AAAA_DOMAIN}) ]] || [[ ${SKIP_IP_CHECK} == "y" ]] || [[ ${SNAT6_TO_SOURCE} != "n" ]]; then
if verify_challenge_path "${DOMAIN}" 6; then
log_f "Confirmed AAAA record with IP $(expand ${AAAA_DOMAIN})"
return 0
else
log_f "Confirmed AAAA record with IP $(expand ${AAAA_DOMAIN}), but HTTP validation failed"
fi
else
log_f "Cannot match your IP $(expand ${IPV6:-"0000:0000:0000:0000:0000:0000:0000:0000"}) against hostname ${DOMAIN} (DNS returned $(expand ${AAAA_DOMAIN}))"
fi
elif [[ ! -z ${A_DOMAIN} ]]; then
log_f "Found A record for ${DOMAIN}: ${A_DOMAIN}"
if [[ ${IPV4:-ERR} == ${A_DOMAIN} ]] || [[ ${SKIP_IP_CHECK} == "y" ]] || [[ ${SNAT_TO_SOURCE} != "n" ]]; then
if verify_challenge_path "${DOMAIN}" 4; then
log_f "Confirmed A record ${A_DOMAIN}"
return 0
else
log_f "Confirmed A record with IP ${A_DOMAIN}, but HTTP validation failed"
fi
else
log_f "Cannot match your IP ${IPV4} against hostname ${DOMAIN} (DNS returned ${A_DOMAIN})"
fi
else
log_f "No A or AAAA record found for hostname ${DOMAIN}"
fi
return 1
}
verify_challenge_path(){
if [[ ${SKIP_HTTP_VERIFICATION} == "y" ]]; then
echo '(skipping check, returning 0)'
return 0
fi
# verify_challenge_path URL 4|6
RANDOM_N=${RANDOM}${RANDOM}${RANDOM}
echo ${RANDOM_N} > /var/www/acme/${RANDOM_N}
if [[ "$(curl --insecure -${2} -L http://${1}/.well-known/acme-challenge/${RANDOM_N} --silent)" == "${RANDOM_N}" ]]; then
rm /var/www/acme/${RANDOM_N}
return 0
else
rm /var/www/acme/${RANDOM_N}
return 1
fi
}

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functions.sh (4 KB)

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