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Emulate Boto when using role metadata

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Use the behavior established in the botocore python library to inform
how and when instance metadata is fetched in an attempt to acquire valid
AWS credentials.

- Use it as a fallback when no other credentials are provided
- Set the timeout of metadata requests to 1 second
This commit is contained in:
Mal Graty 2018-02-20 00:34:55 +00:00
parent 48eaa0e5bf
commit 693627a858
1 changed files with 14 additions and 13 deletions
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27
dnsapi/dns_aws.sh
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@ -20,12 +20,13 @@ dns_aws_add() {
fulldomain=$1 fulldomain=$1
txtvalue=$2 txtvalue=$2
if [ -n "${AWS_USE_INSTANCE_ROLE:=$(_readaccountconf_mutable AWS_USE_INSTANCE_ROLE)}" ]; then AWS_ACCESS_KEY_ID="${AWS_ACCESS_KEY_ID:-$(_readaccountconf_mutable AWS_ACCESS_KEY_ID)}"
AWS_SECRET_ACCESS_KEY="${AWS_SECRET_ACCESS_KEY:-$(_readaccountconf_mutable AWS_SECRET_ACCESS_KEY)}"
if [ -z "$AWS_ACCESS_KEY_ID" ] || [ -z "$AWS_SECRET_ACCESS_KEY" ]; then
_use_instance_role _use_instance_role
fi fi
AWS_ACCESS_KEY_ID="${AWS_ACCESS_KEY_ID:-$(_readaccountconf_mutable AWS_ACCESS_KEY_ID)}"
AWS_SECRET_ACCESS_KEY="${AWS_SECRET_ACCESS_KEY:-$(_readaccountconf_mutable AWS_SECRET_ACCESS_KEY)}"
if [ -z "$AWS_ACCESS_KEY_ID" ] || [ -z "$AWS_SECRET_ACCESS_KEY" ]; then if [ -z "$AWS_ACCESS_KEY_ID" ] || [ -z "$AWS_SECRET_ACCESS_KEY" ]; then
AWS_ACCESS_KEY_ID="" AWS_ACCESS_KEY_ID=""
AWS_SECRET_ACCESS_KEY="" AWS_SECRET_ACCESS_KEY=""
@ -34,10 +35,8 @@ dns_aws_add() {
return 1 return 1
fi fi
#save for future use #save for future use, unless using a role which will be fetched as needed
if [ -n "$AWS_USE_INSTANCE_ROLE" ]; then if [ -z "$_using_instance_role" ]; then
_saveaccountconf_mutable AWS_USE_INSTANCE_ROLE "$AWS_USE_INSTANCE_ROLE"
else
_saveaccountconf_mutable AWS_ACCESS_KEY_ID "$AWS_ACCESS_KEY_ID" _saveaccountconf_mutable AWS_ACCESS_KEY_ID "$AWS_ACCESS_KEY_ID"
_saveaccountconf_mutable AWS_SECRET_ACCESS_KEY "$AWS_SECRET_ACCESS_KEY" _saveaccountconf_mutable AWS_SECRET_ACCESS_KEY "$AWS_SECRET_ACCESS_KEY"
fi fi
@ -85,12 +84,13 @@ dns_aws_rm() {
fulldomain=$1 fulldomain=$1
txtvalue=$2 txtvalue=$2
if [ -n "${AWS_USE_INSTANCE_ROLE:=$(_readaccountconf_mutable AWS_USE_INSTANCE_ROLE)}" ]; then AWS_ACCESS_KEY_ID="${AWS_ACCESS_KEY_ID:-$(_readaccountconf_mutable AWS_ACCESS_KEY_ID)}"
AWS_SECRET_ACCESS_KEY="${AWS_SECRET_ACCESS_KEY:-$(_readaccountconf_mutable AWS_SECRET_ACCESS_KEY)}"
if [ -z "$AWS_ACCESS_KEY_ID" ] || [ -z "$AWS_SECRET_ACCESS_KEY" ]; then
_use_instance_role _use_instance_role
fi fi
AWS_ACCESS_KEY_ID="${AWS_ACCESS_KEY_ID:-$(_readaccountconf_mutable AWS_ACCESS_KEY_ID)}"
AWS_SECRET_ACCESS_KEY="${AWS_SECRET_ACCESS_KEY:-$(_readaccountconf_mutable AWS_SECRET_ACCESS_KEY)}"
_debug "First detect the root zone" _debug "First detect the root zone"
if ! _get_root "$fulldomain"; then if ! _get_root "$fulldomain"; then
_err "invalid domain" _err "invalid domain"
@ -176,14 +176,14 @@ _get_root() {
} }
_use_instance_role() { _use_instance_role() {
if ! _get "$AWS_METADATA_URL/iam/security-credentials/" true | _head_n 1 | grep -Fq 200; then if ! _get "$AWS_METADATA_URL/iam/security-credentials/" true 1 | _head_n 1 | grep -Fq 200; then
_err "Unable to fetch IAM role from AWS instance metadata." _err "Unable to fetch IAM role from AWS instance metadata."
return return
fi fi
_aws_role=$(_get "$AWS_METADATA_URL/iam/security-credentials/") _aws_role=$(_get "$AWS_METADATA_URL/iam/security-credentials/" "" 1)
_debug "_aws_role" "$_aws_role" _debug "_aws_role" "$_aws_role"
_aws_creds="$( _aws_creds="$(
_get "$AWS_METADATA_URL/iam/security-credentials/$_aws_role" \ _get "$AWS_METADATA_URL/iam/security-credentials/$_aws_role" "" 1 \
| _normalizeJson \ | _normalizeJson \
| tr '{,}' '\n' \ | tr '{,}' '\n' \
| while read -r _line; do | while read -r _line; do
@ -201,6 +201,7 @@ _use_instance_role() {
)" )"
_secure_debug "_aws_creds" "$_aws_creds" _secure_debug "_aws_creds" "$_aws_creds"
eval "$_aws_creds" eval "$_aws_creds"
_using_instance_role=true
} }
#method uri qstr data #method uri qstr data