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Pull AWS creds from container role

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Extend the AWS DNS API driver to support ECS container metadata by using
the special environment variable ECS sets in containers.
This commit is contained in:
Mal Graty 2018-02-20 14:55:05 +00:00
parent e58d19b420
commit f49f55f4a5
1 changed files with 23 additions and 5 deletions
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28
dnsapi/dns_aws.sh
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@ -23,7 +23,7 @@ dns_aws_add() {
AWS_SECRET_ACCESS_KEY="${AWS_SECRET_ACCESS_KEY:-$(_readaccountconf_mutable AWS_SECRET_ACCESS_KEY)}"
if [ -z "$AWS_ACCESS_KEY_ID" ] || [ -z "$AWS_SECRET_ACCESS_KEY" ]; then
_use_instance_role
_use_container_role || _use_instance_role
fi
if [ -z "$AWS_ACCESS_KEY_ID" ] || [ -z "$AWS_SECRET_ACCESS_KEY" ]; then
@ -87,7 +87,7 @@ dns_aws_rm() {
AWS_SECRET_ACCESS_KEY="${AWS_SECRET_ACCESS_KEY:-$(_readaccountconf_mutable AWS_SECRET_ACCESS_KEY)}"
if [ -z "$AWS_ACCESS_KEY_ID" ] || [ -z "$AWS_SECRET_ACCESS_KEY" ]; then
_use_instance_role
_use_container_role || _use_instance_role
fi
_debug "First detect the root zone"
@ -174,17 +174,30 @@ _get_root() {
return 1
}
_use_container_role() {
# automatically set if running inside ECS
if [ -z "$AWS_CONTAINER_CREDENTIALS_RELATIVE_URI" ]; then
_debug "No ECS environment variable detected"
return 1
fi
_use_metadata "169.254.170.2$AWS_CONTAINER_CREDENTIALS_RELATIVE_URI"
}
_use_instance_role() {
_url="http://169.254.169.254/latest/meta-data/iam/security-credentials/"
_debug "_url" "$_url"
if ! _get "$_url" true 1 | _head_n 1 | grep -Fq 200; then
_err "Unable to fetch IAM role from AWS instance metadata."
return
_debug "Unable to fetch IAM role from instance metadata"
return 1
fi
_aws_role=$(_get "$_url" "" 1)
_debug "_aws_role" "$_aws_role"
_use_metadata "$_url$_aws_role"
}
_use_metadata() {
_aws_creds="$(
_get "$_url$_aws_role" "" 1 \
_get "$1" "" 1 \
| _normalizeJson \
| tr '{,}' '\n' \
| while read -r _line; do
@ -201,6 +214,11 @@ _use_instance_role() {
| paste -sd' ' -
)"
_secure_debug "_aws_creds" "$_aws_creds"
if [ -z "$_aws_creds" ]; then
return 1
fi
eval "$_aws_creds"
_using_role=true
}