Comments (2)
Same here OpenSSL 3.0.2
Is there any solution?
from kr.
Looking into this, unfortunately with how things are architected, this requires an update to the mobile apps as well.
Currently the daemon is failing to parse the signature payload as the agent restriction change modified the payload to include an additional server host key field. ssh.Unmarshal
errors out if after unmarshaling there is still data in the buffer. This can be fixed with
type signaturePayload struct {
Session []byte
Type byte
User string
Service string
Method string
Sign bool
Algo []byte
PubKey []byte
// OpenSSH 8.9 modifies the struct, use the "rest" tag to either take an empty slice on older versions, or the host key on newer versions
ServerHostKey []byte `ssh:"rest"`
}
However, the daemon<>app protocol attempts to optimise the payload that is sent over the wire, so the public key is omitted from the signature payload, and the mobile app is responsible for appending the key to the payload to be signed.
This is problematic with agent restriction, as the new server host key comes after the public key, which means without changes to the mobile apps, it is not possible to get the apps to sign the correct payload.
The new Akamai akr
tool doesn't suffer from this as it treats the signature payload as an opaque blob to sign.
from kr.
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from kr.