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Merge pull request #4979 from derytim/aws_dns_imdsv2

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Aws dns imdsv2
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neil 2024-03-18 21:16:16 +01:00 committed by GitHub
commit 49f6104f03
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1 changed files with 23 additions and 8 deletions
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31
dnsapi/dns_aws.sh
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@ -145,7 +145,6 @@ dns_aws_rm() {
fi
_sleep 1
return 1
}
#################### Private functions below ##################################
@ -207,24 +206,40 @@ _use_container_role() {
}
_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
_instance_role_name_url="http://169.254.169.254/latest/meta-data/iam/security-credentials/"
if _get "$_instance_role_name_url" true 1 | _head_n 1 | grep -Fq 401; then
_debug "Using IMDSv2"
_token_url="http://169.254.169.254/latest/api/token"
export _H1="X-aws-ec2-metadata-token-ttl-seconds: 21600"
_token="$(_post "" "$_token_url" "" "PUT")"
_secure_debug3 "_token" "$_token"
if [ -z "$_token" ]; then
_debug "Unable to fetch IMDSv2 token from instance metadata"
return 1
fi
export _H1="X-aws-ec2-metadata-token: $_token"
fi
if ! _get "$_instance_role_name_url" true 1 | _head_n 1 | grep -Fq 200; then
_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$_aws_role"
_instance_role_name=$(_get "$_instance_role_name_url" "" 1)
_debug "_instance_role_name" "$_instance_role_name"
_use_metadata "$_instance_role_name_url$_instance_role_name" "$_token"
}
_use_metadata() {
export _H1="X-aws-ec2-metadata-token: $2"
_aws_creds="$(
_get "$1" "" 1 |
_normalizeJson |
tr '{,}' '\n' |
while read -r _line; do
_key="$(echo "${_line%%:*}" | tr -d '"')"
_key="$(echo "${_line%%:*}" | tr -d '\"')"
_value="${_line#*:}"
_debug3 "_key" "$_key"
_secure_debug3 "_value" "$_value"