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acme.sh/dnsapi/dns_azure.sh

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#!/usr/bin/env sh
WIKI="https://github.com/acmesh-official/acme.sh/wiki/How-to-use-Azure-DNS"
######## Public functions #####################
# Usage: add _acme-challenge.www.domain.com "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
# Used to add txt record
#
# Ref: https://docs.microsoft.com/en-us/rest/api/dns/recordsets/createorupdate
#
dns_azure_add() {
fulldomain=$1
txtvalue=$2
AZUREDNS_SUBSCRIPTIONID="${AZUREDNS_SUBSCRIPTIONID:-$(_readaccountconf_mutable AZUREDNS_SUBSCRIPTIONID)}"
if [ -z "$AZUREDNS_SUBSCRIPTIONID" ]; then
AZUREDNS_SUBSCRIPTIONID=""
AZUREDNS_TENANTID=""
AZUREDNS_APPID=""
AZUREDNS_CLIENTSECRET=""
_err "You didn't specify the Azure Subscription ID"
return 1
fi
#save subscription id to account conf file.
_saveaccountconf_mutable AZUREDNS_SUBSCRIPTIONID "$AZUREDNS_SUBSCRIPTIONID"
AZUREDNS_MANAGEDIDENTITY="${AZUREDNS_MANAGEDIDENTITY:-$(_readaccountconf_mutable AZUREDNS_MANAGEDIDENTITY)}"
if [ "$AZUREDNS_MANAGEDIDENTITY" = true ]; then
_info "Using Azure managed identity"
#save managed identity as preferred authentication method, clear service principal credentials from conf file.
_saveaccountconf_mutable AZUREDNS_MANAGEDIDENTITY "$AZUREDNS_MANAGEDIDENTITY"
_saveaccountconf_mutable AZUREDNS_TENANTID ""
_saveaccountconf_mutable AZUREDNS_APPID ""
_saveaccountconf_mutable AZUREDNS_CLIENTSECRET ""
else
_info "You didn't ask to use Azure managed identity, checking service principal credentials"
AZUREDNS_TENANTID="${AZUREDNS_TENANTID:-$(_readaccountconf_mutable AZUREDNS_TENANTID)}"
AZUREDNS_APPID="${AZUREDNS_APPID:-$(_readaccountconf_mutable AZUREDNS_APPID)}"
AZUREDNS_CLIENTSECRET="${AZUREDNS_CLIENTSECRET:-$(_readaccountconf_mutable AZUREDNS_CLIENTSECRET)}"
if [ -z "$AZUREDNS_TENANTID" ]; then
AZUREDNS_SUBSCRIPTIONID=""
AZUREDNS_TENANTID=""
AZUREDNS_APPID=""
AZUREDNS_CLIENTSECRET=""
_err "You didn't specify the Azure Tenant ID "
return 1
fi
if [ -z "$AZUREDNS_APPID" ]; then
AZUREDNS_SUBSCRIPTIONID=""
AZUREDNS_TENANTID=""
AZUREDNS_APPID=""
AZUREDNS_CLIENTSECRET=""
_err "You didn't specify the Azure App ID"
return 1
fi
if [ -z "$AZUREDNS_CLIENTSECRET" ]; then
AZUREDNS_SUBSCRIPTIONID=""
AZUREDNS_TENANTID=""
AZUREDNS_APPID=""
AZUREDNS_CLIENTSECRET=""
_err "You didn't specify the Azure Client Secret"
return 1
fi
#save account details to account conf file, don't opt in for azure manages identity check.
_saveaccountconf_mutable AZUREDNS_MANAGEDIDENTITY "false"
_saveaccountconf_mutable AZUREDNS_TENANTID "$AZUREDNS_TENANTID"
_saveaccountconf_mutable AZUREDNS_APPID "$AZUREDNS_APPID"
_saveaccountconf_mutable AZUREDNS_CLIENTSECRET "$AZUREDNS_CLIENTSECRET"
fi
accesstoken=$(_azure_getaccess_token "$AZUREDNS_MANAGEDIDENTITY" "$AZUREDNS_TENANTID" "$AZUREDNS_APPID" "$AZUREDNS_CLIENTSECRET")
if ! _get_root "$fulldomain" "$AZUREDNS_SUBSCRIPTIONID" "$accesstoken"; then
_err "invalid domain"
return 1
fi
_debug _domain_id "$_domain_id"
_debug _sub_domain "$_sub_domain"
_debug _domain "$_domain"
acmeRecordURI="https://management.azure.com$(printf '%s' "$_domain_id" | sed 's/\\//g')/TXT/$_sub_domain?api-version=2017-09-01"
_debug "$acmeRecordURI"
# Get existing TXT record
_azure_rest GET "$acmeRecordURI" "" "$accesstoken"
values="{\"value\":[\"$txtvalue\"]}"
timestamp="$(_time)"
if [ "$_code" = "200" ]; then
vlist="$(echo "$response" | _egrep_o "\"value\"\\s*:\\s*\\[\\s*\"[^\"]*\"\\s*]" | cut -d : -f 2 | tr -d "[]\"")"
_debug "existing TXT found"
_debug "$vlist"
existingts="$(echo "$response" | _egrep_o "\"acmetscheck\"\\s*:\\s*\"[^\"]*\"" | _head_n 1 | cut -d : -f 2 | tr -d "\"")"
if [ -z "$existingts" ]; then
# the record was not created by acme.sh. Copy the exisiting entires
existingts=$timestamp
fi
_diff="$(_math "$timestamp - $existingts")"
_debug "existing txt age: $_diff"
# only use recently added records and discard if older than 2 hours because they are probably orphaned
if [ "$_diff" -lt 7200 ]; then
_debug "existing txt value: $vlist"
for v in $vlist; do
values="$values ,{\"value\":[\"$v\"]}"
done
fi
fi
# Add the txtvalue TXT Record
body="{\"properties\":{\"metadata\":{\"acmetscheck\":\"$timestamp\"},\"TTL\":10, \"TXTRecords\":[$values]}}"
_azure_rest PUT "$acmeRecordURI" "$body" "$accesstoken"
if [ "$_code" = "200" ] || [ "$_code" = '201' ]; then
_info "validation value added"
return 0
else
_err "error adding validation value ($_code)"
return 1
fi
}
# Usage: fulldomain txtvalue
# Used to remove the txt record after validation
#
# Ref: https://docs.microsoft.com/en-us/rest/api/dns/recordsets/delete
#
dns_azure_rm() {
fulldomain=$1
txtvalue=$2
AZUREDNS_SUBSCRIPTIONID="${AZUREDNS_SUBSCRIPTIONID:-$(_readaccountconf_mutable AZUREDNS_SUBSCRIPTIONID)}"
if [ -z "$AZUREDNS_SUBSCRIPTIONID" ]; then
AZUREDNS_SUBSCRIPTIONID=""
AZUREDNS_TENANTID=""
AZUREDNS_APPID=""
AZUREDNS_CLIENTSECRET=""
_err "You didn't specify the Azure Subscription ID "
return 1
fi
AZUREDNS_MANAGEDIDENTITY="${AZUREDNS_MANAGEDIDENTITY:-$(_readaccountconf_mutable AZUREDNS_MANAGEDIDENTITY)}"
if [ "$AZUREDNS_MANAGEDIDENTITY" = true ]; then
_info "Using Azure managed identity"
else
_info "You didn't ask to use Azure managed identity, checking service principal credentials"
AZUREDNS_TENANTID="${AZUREDNS_TENANTID:-$(_readaccountconf_mutable AZUREDNS_TENANTID)}"
AZUREDNS_APPID="${AZUREDNS_APPID:-$(_readaccountconf_mutable AZUREDNS_APPID)}"
AZUREDNS_CLIENTSECRET="${AZUREDNS_CLIENTSECRET:-$(_readaccountconf_mutable AZUREDNS_CLIENTSECRET)}"
if [ -z "$AZUREDNS_TENANTID" ]; then
AZUREDNS_SUBSCRIPTIONID=""
AZUREDNS_TENANTID=""
AZUREDNS_APPID=""
AZUREDNS_CLIENTSECRET=""
_err "You didn't specify the Azure Tenant ID "
return 1
fi
if [ -z "$AZUREDNS_APPID" ]; then
AZUREDNS_SUBSCRIPTIONID=""
AZUREDNS_TENANTID=""
AZUREDNS_APPID=""
AZUREDNS_CLIENTSECRET=""
_err "You didn't specify the Azure App ID"
return 1
fi
if [ -z "$AZUREDNS_CLIENTSECRET" ]; then
AZUREDNS_SUBSCRIPTIONID=""
AZUREDNS_TENANTID=""
AZUREDNS_APPID=""
AZUREDNS_CLIENTSECRET=""
_err "You didn't specify the Azure Client Secret"
return 1
fi
fi
accesstoken=$(_azure_getaccess_token "$AZUREDNS_MANAGEDIDENTITY" "$AZUREDNS_TENANTID" "$AZUREDNS_APPID" "$AZUREDNS_CLIENTSECRET")
if ! _get_root "$fulldomain" "$AZUREDNS_SUBSCRIPTIONID" "$accesstoken"; then
_err "invalid domain"
return 1
fi
_debug _domain_id "$_domain_id"
_debug _sub_domain "$_sub_domain"
_debug _domain "$_domain"
acmeRecordURI="https://management.azure.com$(printf '%s' "$_domain_id" | sed 's/\\//g')/TXT/$_sub_domain?api-version=2017-09-01"
_debug "$acmeRecordURI"
# Get existing TXT record
_azure_rest GET "$acmeRecordURI" "" "$accesstoken"
timestamp="$(_time)"
if [ "$_code" = "200" ]; then
vlist="$(echo "$response" | _egrep_o "\"value\"\\s*:\\s*\\[\\s*\"[^\"]*\"\\s*]" | cut -d : -f 2 | tr -d "[]\"" | grep -v -- "$txtvalue")"
values=""
comma=""
for v in $vlist; do
values="$values$comma{\"value\":[\"$v\"]}"
comma=","
done
if [ -z "$values" ]; then
# No values left remove record
_debug "removing validation record completely $acmeRecordURI"
_azure_rest DELETE "$acmeRecordURI" "" "$accesstoken"
if [ "$_code" = "200" ] || [ "$_code" = '204' ]; then
_info "validation record removed"
else
_err "error removing validation record ($_code)"
return 1
fi
else
# Remove only txtvalue from the TXT Record
body="{\"properties\":{\"metadata\":{\"acmetscheck\":\"$timestamp\"},\"TTL\":10, \"TXTRecords\":[$values]}}"
_azure_rest PUT "$acmeRecordURI" "$body" "$accesstoken"
if [ "$_code" = "200" ] || [ "$_code" = '201' ]; then
_info "validation value removed"
return 0
else
_err "error removing validation value ($_code)"
return 1
fi
fi
fi
}
################### Private functions below ##################################
_azure_rest() {
m=$1
ep="$2"
data="$3"
accesstoken="$4"
MAX_REQUEST_RETRY_TIMES=5
_request_retry_times=0
while [ "${_request_retry_times}" -lt "$MAX_REQUEST_RETRY_TIMES" ]; do
_debug3 _request_retry_times "$_request_retry_times"
export _H1="authorization: Bearer $accesstoken"
export _H2="accept: application/json"
export _H3="Content-Type: application/json"
# clear headers from previous request to avoid getting wrong http code on timeouts
: >"$HTTP_HEADER"
_debug "$ep"
if [ "$m" != "GET" ]; then
_secure_debug2 "data $data"
response="$(_post "$data" "$ep" "" "$m")"
else
response="$(_get "$ep")"
fi
_ret="$?"
_secure_debug2 "response $response"
_code="$(grep "^HTTP" "$HTTP_HEADER" | _tail_n 1 | cut -d " " -f 2 | tr -d "\\r\\n")"
_debug "http response code $_code"
if [ "$_code" = "401" ]; then
# we have an invalid access token set to expired
_saveaccountconf_mutable AZUREDNS_TOKENVALIDTO "0"
_err "access denied make sure your Azure settings are correct. See $WIKI"
return 1
fi
# See https://docs.microsoft.com/en-us/azure/architecture/best-practices/retry-service-specific#general-rest-and-retry-guidelines for retryable HTTP codes
if [ "$_ret" != "0" ] || [ -z "$_code" ] || [ "$_code" = "408" ] || [ "$_code" = "500" ] || [ "$_code" = "503" ] || [ "$_code" = "504" ]; then
_request_retry_times="$(_math "$_request_retry_times" + 1)"
_info "REST call error $_code retrying $ep in $_request_retry_times s"
_sleep "$_request_retry_times"
continue
fi
break
done
if [ "$_request_retry_times" = "$MAX_REQUEST_RETRY_TIMES" ]; then
_err "Error Azure REST called was retried $MAX_REQUEST_RETRY_TIMES times."
_err "Calling $ep failed."
return 1
fi
response="$(echo "$response" | _normalizeJson)"
return 0
}
## Ref: https://docs.microsoft.com/en-us/azure/active-directory/develop/active-directory-protocols-oauth-service-to-service#request-an-access-token
_azure_getaccess_token() {
managedIdentity=$1
tenantID=$2
clientID=$3
clientSecret=$4
accesstoken="${AZUREDNS_BEARERTOKEN:-$(_readaccountconf_mutable AZUREDNS_BEARERTOKEN)}"
expires_on="${AZUREDNS_TOKENVALIDTO:-$(_readaccountconf_mutable AZUREDNS_TOKENVALIDTO)}"
# can we reuse the bearer token?
if [ -n "$accesstoken" ] && [ -n "$expires_on" ]; then
if [ "$(_time)" -lt "$expires_on" ]; then
# brearer token is still valid - reuse it
_debug "reusing bearer token"
printf "%s" "$accesstoken"
return 0
else
_debug "bearer token expired"
fi
fi
_debug "getting new bearer token"
if [ "$managedIdentity" = true ]; then
# https://docs.microsoft.com/en-us/azure/active-directory/managed-identities-azure-resources/how-to-use-vm-token#get-a-token-using-http
export _H1="Metadata: true"
response="$(_get http://169.254.169.254/metadata/identity/oauth2/token\?api-version=2018-02-01\&resource=https://management.azure.com/)"
response="$(echo "$response" | _normalizeJson)"
accesstoken=$(echo "$response" | _egrep_o "\"access_token\":\"[^\"]*\"" | _head_n 1 | cut -d : -f 2 | tr -d \")
expires_on=$(echo "$response" | _egrep_o "\"expires_on\":\"[^\"]*\"" | _head_n 1 | cut -d : -f 2 | tr -d \")
else
export _H1="accept: application/json"
export _H2="Content-Type: application/x-www-form-urlencoded"
body="resource=$(printf "%s" 'https://management.core.windows.net/' | _url_encode)&client_id=$(printf "%s" "$clientID" | _url_encode)&client_secret=$(printf "%s" "$clientSecret" | _url_encode)&grant_type=client_credentials"
_secure_debug2 "data $body"
response="$(_post "$body" "https://login.microsoftonline.com/$tenantID/oauth2/token" "" "POST")"
_ret="$?"
_secure_debug2 "response $response"
response="$(echo "$response" | _normalizeJson)"
accesstoken=$(echo "$response" | _egrep_o "\"access_token\":\"[^\"]*\"" | _head_n 1 | cut -d : -f 2 | tr -d \")
expires_on=$(echo "$response" | _egrep_o "\"expires_on\":\"[^\"]*\"" | _head_n 1 | cut -d : -f 2 | tr -d \")
fi
if [ -z "$accesstoken" ]; then
_err "no acccess token received. Check your Azure settings see $WIKI"
return 1
fi
if [ "$_ret" != "0" ]; then
_err "error $response"
return 1
fi
_saveaccountconf_mutable AZUREDNS_BEARERTOKEN "$accesstoken"
_saveaccountconf_mutable AZUREDNS_TOKENVALIDTO "$expires_on"
printf "%s" "$accesstoken"
return 0
}
_get_root() {
domain=$1
subscriptionId=$2
accesstoken=$3
i=1
p=1
## Ref: https://docs.microsoft.com/en-us/rest/api/dns/zones/list
## returns up to 100 zones in one response therefore handling more results is not not implemented
## (ZoneListResult with continuation token for the next page of results)
## Per https://docs.microsoft.com/en-us/azure/azure-subscription-service-limits#dns-limits you are limited to 100 Zone/subscriptions anyways
##
_azure_rest GET "https://management.azure.com/subscriptions/$subscriptionId/providers/Microsoft.Network/dnszones?\$top=500&api-version=2017-09-01" "" "$accesstoken"
# Find matching domain name in Json response
while true; do
h=$(printf "%s" "$domain" | cut -d . -f $i-100)
_debug2 "Checking domain: $h"
if [ -z "$h" ]; then
#not valid
_err "Invalid domain"
return 1
fi
if _contains "$response" "\"name\":\"$h\"" >/dev/null; then
_domain_id=$(echo "$response" | _egrep_o "\\{\"id\":\"[^\"]*\\/$h\"" | head -n 1 | cut -d : -f 2 | tr -d \")
if [ "$_domain_id" ]; then
if [ "$i" = 1 ]; then
#create the record at the domain apex (@) if only the domain name was provided as --domain-alias
_sub_domain="@"
else
_sub_domain=$(echo "$domain" | cut -d . -f 1-$p)
fi
_domain=$h
return 0
fi
return 1
fi
p=$i
i=$(_math "$i" + 1)
done
return 1
}
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