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Cache IMDS tokens per-user #1386

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merged 1 commit into from
Aug 15, 2023
Merged

Cache IMDS tokens per-user #1386

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7 changes: 3 additions & 4 deletions files/bin/imds
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Original file line number Diff line number Diff line change
Expand Up @@ -49,8 +49,8 @@ function imdscurl() {
}

function get-token() {
local TOKEN_DIR=/tmp/imds-tokens
mkdir -p -m a+wrx $TOKEN_DIR
local TOKEN_DIR="/tmp/imds-tokens/$(whoami)"
mkdir -p -m 0600 $TOKEN_DIR

# cleanup expired tokens
local DELETED_TOKENS=0
Expand All @@ -71,8 +71,7 @@ function get-token() {
-X PUT \
"http://$IMDS_ENDPOINT/latest/api/token")
echo "$TOKEN" > "$TOKEN_DIR/$TOKEN_FILE"
# make sure any user can utilize (and clean up) these tokens
chmod a+rwx $TOKEN_DIR/$TOKEN_FILE
chmod 0600 "$TOKEN_DIR/$TOKEN_FILE"
log "🔑 Retrieved a fresh IMDS token that will expire in $IMDS_TOKEN_TTL_SECONDS seconds."
else
log "ℹ️ Using cached IMDS token that expires in $(($TOKEN_FILE - $CURRENT_TIME)) seconds."
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2 changes: 1 addition & 1 deletion test/cases/imds-token-refresh.sh
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Expand Up @@ -6,7 +6,7 @@ set -o pipefail

echo "--> Should refresh IMDS token on configured interval"
exit_code=0
TOKEN_DIR=/tmp/imds-tokens
TOKEN_DIR=/tmp/imds-tokens/$(whoami)
TTL=5
export IMDS_TOKEN_TTL_SECONDS=$TTL
export IMDS_DEBUG=true
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