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name create-ums-sigv4-key
description Mint a new SigV4 S3 access key (access-key-id + secret) on the Together User Management Service (UMS) via its gRPC Key API, so you can authenticate to the s3-proxy. Discovers the project/creator from an existing key, then calls CreateProjectKeyV1 with token_type=SIGV4 and a future expiry. Use for "create a sigv4 token on ums", "mint a new UMS key", "I need valid s3-proxy credentials", or when the s3-proxy logs show keyExpired=true.

Create a SigV4 key on UMS

The s3-proxy authenticates S3 requests against UMS (<UMS_ENDPOINT>, gRPC/TLS). AWS_ACCESS_KEY_ID = the UMS key id (key_…), AWS_SECRET_ACCESS_KEY = the key's token (tgs_v1_… for SigV4). When a key's ExpiresAt is in the past, the proxy rejects every request with keyExpired: true (see [[s3-proxy-ceph-e2e]]).

API (module github.com/togethercomputer/user-management-service/clients/go/gen/ums)

  • Auth: gRPC metadata authorization: Bearer <UMS_SERVICE_KEY> (the same service key s3-proxy uses, ums_v1_…).
  • GetV1{KeyId} → returns KeyV1 incl. ProjectId, CreatorId, Scopes, TokenType. Use it to discover the project/creator of an existing key.
  • CreateProjectKeyV1{ProjectId, CreatorId, Description, ExpiresAt(*timestamppb), Scopes(*KeyScopesV1{Tcloud:true}), TokenType(*KeyTokenType = KEY_TOKEN_TYPE_SIGV4)} → Reply{Id, Token, ExpiresAt, TokenSuffix, …}. Id is the new key_…; Token is the secret.

Run the bundled client

client/ here has a self-contained main.go + go.mod (Go 1.26). It reads an existing key to clone its project/creator, then creates a 1-year SigV4 key:

cd client
GOFLAGS=-mod=mod GOWORK=off \
UMS_SERVICE_KEY=<ums_v1_…> EXISTING_KEY=<key_…> go run .
# prints AWS_ACCESS_KEY_ID=key_…  and  AWS_SECRET_ACCESS_KEY=tgs_v1_…

Gotchas

  • KeyV1.Scopes (read type *KeyV1_Scopes) ≠ the create request's *KeyScopesV1 — don't copy it across; construct a fresh &pb.KeyScopesV1{Tcloud:true} (tcloud scope is what the substrate s3-proxy needs).
  • TokenType is a oneof pointer field — pass &tt.
  • The service key must be authorized to create (the s3-proxy read key worked for create in our case). On PermissionDenied, you need a higher-privilege UMS key.
  • This writes to production UMS — set a sane Description and expiry; it's a real credential.
  • Reachable from a laptop (<UMS_ENDPOINT> → AWS ELB) and from the transporter.