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shankar0123
2e9262cfb7
Acquisition-audit Sprint 1 follow-up to SEC-001 (2026-05-16). Companion
to SEC-020 (prior commit). Closes the second of the two adjacent OIDC
call sites the original SEC-001 sweep missed: the per-request discovery
re-fetch in DefaultBCLVerifier.Verify.
Pre-fix:
func (v *DefaultBCLVerifier) Verify(ctx, logoutToken) {
...
provider, perr := gooidc.NewProvider(ctx, matched.IssuerURL)
...
}
Same shape as service.go::fetchUserinfoGroups (closed in the prior
commit) and service.go:1084 (closed by SEC-001 itself). go-oidc's
NewProvider derives its http.Client from ctx; bare ctx falls through
to http.DefaultClient at the discovery-doc + JWKS-fetch dial. An IdP
whose registered IssuerURL resolves to a reserved address (or is
rebinding to one at logout time) would trigger an unguarded HTTPS
egress on every back-channel-logout request.
Post-fix:
provider, perr := gooidc.NewProvider(
oidcsvc.SafeOIDCContext(ctx), matched.IssuerURL)
The 'oidcsvc' alias for github.com/certctl-io/certctl/internal/auth/oidc
is added to the import block (matches the canonical alias used in
cmd/server/main.go:29). SafeOIDCContext routes the dial through
validation.SafeHTTPDialContext, which re-resolves the issuer host at
dial time and refuses reserved-address answers (loopback /
link-local / 169.254.169.254 cloud-metadata).
Files touched:
internal/api/handler/auth_session_oidc_bcl.go — add oidcsvc import +
wrap ctx at the NewProvider call site
internal/api/handler/auth_session_oidc_bcl_test.go — NEW FILE.
TestDefaultBCLVerifier_SSRF_BlocksReservedAddress constructs a
stubProviderRepo with IssuerURL='http://127.0.0.1:1' (literal
loopback — the IP-literal class that SafeHTTPDialContext.
isReservedIPForDial refuses up-front, before any DNS resolution).
Hand-rolls a 3-segment JWT whose payload base64url-decodes to
{"iss":"<loopback url>"} so peekIssuer extracts the matching
issuer and provs.List() returns the seeded provider. Calls Verify
and asserts the error wraps the dial-time reserved-address
rejection (substring match on 'refusing to dial' / 'reserved
address') AND that it's wrapped through the 'provider discovery:'
prefix that distinguishes a discovery-time dial failure from a
signature-verification failure.
docs/operator/auth-threat-model.md — NEW subsection 'Userinfo + BCL
SSRF parity (post-SEC-001 follow-up)' under '### Back-channel
logout'. Documents both SEC-020 and SEC-021 closures, the
context-key shape (why a single SafeOIDCContext wrap covers both
go-oidc and oauth2 legs), and the out-of-scope RFC 1918 carve-out
(covered separately by acquisition-audit Sprint 5 RED-005). Cross-
references the two pinning tests by name so future audits can
locate the load-bearing enforcement.
Verified:
gofmt -l internal/ docs/ (clean)
go vet ./... (clean)
go test -race -short ./internal/api/handler/... (all green)
TestDefaultBCLVerifier_SSRF_BlocksReservedAddress (new; green)
All 4 cited CI guards pass.
Acceptance grep on the BCL handler:
internal/api/handler/auth_session_oidc_bcl.go:132:
provider, perr := gooidc.NewProvider(oidcsvc.SafeOIDCContext(ctx), matched.IssuerURL)
No bare-ctx NewProvider remains in the BCL verifier. Combined with the
SEC-020 commit, every gooidc.NewProvider + Provider.UserInfo call site
in the production OIDC + BCL surface now routes through
SafeOIDCContext.
Closes acquisition-audit SEC-021. Sprint 1 ACQ is complete (2/2
findings). The single sprint shipped as two operator-authored commits
(per-finding, mirrors the project's commit cadence for closures).