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Add support for AWS IMDSv1

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This commit is contained in:
Leonardo Arena 2026-03-25 20:09:10 +01:00
parent b5adb70a48
commit daed749da6
4 changed files with 34 additions and 7 deletions
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15
README.md
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@ -120,6 +120,21 @@ The default endpoint is `169.254.169.254` for most cloud providers. This
setting allows you to specify a custom IP address and optional port for the
metadata service.
### AWS Metadata API Version
For AWS-compatible metadata services that don't support IMDSv2 tokens (like
Tinkerbell's Hegel), you can specify the API version in `/etc/tiny-cloud.conf`:
```sh
# Use IMDSv1 (2009-04-04) without tokens for Tinkerbell
CLOUD=aws
IMDS_ENDPOINT=192.0.2.1:50061
IMDS_URI=2009-04-04
```
The default is `latest` which uses IMDSv2 with token authentication. Setting
`IMDS_URI=2009-04-04` uses the older IMDSv1 API without tokens.
## Operation
The first time an instance boots -- either freshly instantiated from an image,

1
bin/imds
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@ -41,7 +41,6 @@ fi
unset \
IMDS_HEADER \
IMDS_URI \
IMDS_QUERY
unset -f \
_imds_token \

18
lib/tiny-cloud/cloud/aws/imds
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@ -5,14 +5,22 @@
IMDS_HEADER="X-aws-ec2-metadata-token"
IMDS_TOKEN_TTL_HEADER="X-aws-ec2-metadata-token-ttl-seconds"
: "${IMDS_TOKEN_TTL:=5}"
IMDS_URI="latest"
# Allow override of IMDS API version (default: latest, can use 2009-04-04 for IMDSv1)
: "${IMDS_URI:=latest}"
_imds_token() {
printf "PUT /latest/api/token HTTP/1.0\r\n%s: %s\r\n\r\n" \
"$IMDS_TOKEN_TTL_HEADER" "$IMDS_TOKEN_TTL" \
| nc -w 1 "$IMDS_ENDPOINT" 80 | tail -n 1
# Only try to get token if using 'latest' API version (IMDSv2)
# Older versions like 2009-04-04 don't support tokens (IMDSv1)
if [ "$IMDS_URI" = "latest" ]; then
printf "PUT /latest/api/token HTTP/1.0\r\n%s: %s\r\n\r\n" \
"$IMDS_TOKEN_TTL_HEADER" "$IMDS_TOKEN_TTL" \
| nc -w 1 "$IMDS_ENDPOINT" 80 | tail -n 1
fi
}
_imds_header() {
echo "$IMDS_HEADER: $(_imds_token)"
local token="$(_imds_token)"
if [ -n "$token" ]; then
echo "$IMDS_HEADER: $token"
fi
}

7
lib/tiny-cloud/tiny-cloud.conf
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@ -13,7 +13,12 @@
# Useful for custom metadata services
#IMDS_ENDPOINT=169.254.169.254
# IMDS token validity, in seconds (AWS only)
# IMDS API version (AWS only)
# Defaults to 'latest' (IMDSv2 with tokens)
# Use '2009-04-04' for IMDSv1 without tokens (e.g., Tinkerbell)
#IMDS_URI=latest
# IMDS token validity, in seconds (AWS only, IMDSv2)
#IMDS_TOKEN_TTL=5
# Location of var directory