cmd/tailscale/cli/up.go: add support for OIDC JWT authkeyssam/tailscale-up-with-jwt

Updates #16374

Signed-off-by: Sam Linville <sam@tailscale.com>

1 files changed, 17 insertions, 6 deletions

diff --git a/cmd/tailscale/cli/up.go b/cmd/tailscale/cli/up.go
index 1863957d3..d32fddee4 100644
--- a/cmd/tailscale/cli/up.go
+++ b/cmd/tailscale/cli/up.go
@@ -1100,21 +1100,32 @@ func exitNodeIP(p *ipn.Prefs, st *ipnstate.Status) (ip netip.Addr) {
 }
 
 // resolveAuthKey either returns v unchanged (in the common case) or, if it
-// starts with "tskey-client-" (as Tailscale OAuth secrets do) parses it like
+// starts with "tskey-client-" (as Tailscale OAuth secrets do) or jwt:
+// (a prefix to indicate an OIDC JWT), parses it like
 //
-//	tskey-client-xxxx[?ephemeral=false&bar&preauthorized=BOOL&baseURL=...]
+//		tskey-client-xxxx[?ephemeral=false&bar&preauthorized=BOOL&baseURL=...]
+//	 or
+//		jwt:eyJ...[?ephemeral=false&preauthorized=BOOL&baseURL=...]
 //
-// and does the OAuth2 dance to get and return an authkey. The "ephemeral"
+// and does the OAuth or OIDC dance to get and return an authkey. The "ephemeral"
 // property defaults to true if unspecified. The "preauthorized" defaults to
 // false. The "baseURL" defaults to https://api.tailscale.com.
 // The passed in tags are required, and must be non-empty. These will be
-// set on the authkey generated by the OAuth2 dance.
+// set on the authkey generated by the OAuth2/OIDC dance.
 func resolveAuthKey(ctx context.Context, v, tags string) (string, error) {
-	if !strings.HasPrefix(v, "tskey-client-") {
+	var authType string
+
+	if strings.HasPrefix(v, "tskey-client-") {
+		authType = "OAuth"
+	} else if strings.HasPrefix(v, "jwt:") {
+		authType = "OIDC JWT"
+		v = strings.TrimPrefix(v, "jwt:")
+	} else {
+		// Return unchanged for all other key types (including tskey-auth-*)
 		return v, nil
 	}
 	if tags == "" {
-		return "", errors.New("oauth authkeys require --advertise-tags")
+		return "", fmt.Errorf("%s authkeys require --advertise-tags", authType)
 	}
 
 	clientSecret, named, _ := strings.Cut(v, "?")