[v12] Prevent remote proxies from impersonating users from different clusters#33542
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tigrato merged 1 commit intobranch/v12from Oct 31, 2023
Merged
[v12] Prevent remote proxies from impersonating users from different clusters#33542tigrato merged 1 commit intobranch/v12from
tigrato merged 1 commit intobranch/v12from
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…rs (#33536) * Prevent remote proxies from impersonating users from different clusters This PR prevents root proxies from impersonating users from different clusters when accessing a leaf cluster. During authentication, the proxy presents its certificate and sends the impersonation header. A malicious attacker in possession of the root cluster proxy cert-key pair could bypass the root-leaf cluster permissions boundary by impersonating local users. This PR prevents that and remote proxies can only impersonate users belonging to their cluster. KubeCSR Flow: ```mermaid sequenceDiagram ROOT PROXY->>+LEAF PROXY: Forward the request identity cert LEAF PROXY ->> LEAF AUTH SRV: Sign identity via KubeCSR LEAF AUTH SRV -->> LEAF PROXY: Identity cert LEAF PROXY ->> LEAF KUBE SERVICE: Forward the request using cert LEAF KUBE SERVICE -->> LEAF PROXY: Return response LEAF PROXY -->> ROOT PROXY: Return response ``` Impersonation Flow: ```mermaid sequenceDiagram ROOT PROXY->>+LEAF PROXY: Forward the request identity by Impersonating LEAF PROXY ->> LEAF KUBE SERVICE: Forward the request identity by Impersonating LEAF KUBE SERVICE -->> LEAF PROXY: Return response LEAF PROXY -->> ROOT PROXY: Return response ``` Fixes gravitational/teleport-private#968 Signed-off-by: Tiago Silva <tiago.silva@goteleport.com> * fix message
rosstimothy
approved these changes
Oct 16, 2023
r0mant
approved these changes
Oct 31, 2023
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Backport #33536 to branch/v12