Add wasm to content security policy for web ssh terminal (#48849)

Without this, wasm modules imported by xtermjs cannot function. This
follows the same policy as web desktop sessions

lib/httplib/httpheaders.go

@@ -188,6 +188,10 @@ var desktopSessionRe = regexp.MustCompile(`^/web/cluster/[^/]+/desktops/[^/]+/[^
 // which is a route to a desktop recording that uses WASM.
 var recordingRe = regexp.MustCompile(`^/web/cluster/[^/]+/session/[^/]+$`)
 
+// regex for the ssh terminal endpoint /web/cluster/:clusterId/console/node/:sid/:login
+// which is a route to a ssh session that uses WASM.
+var sshSessionRe = regexp.MustCompile(`^/web/cluster/[^/]+/console/node/[^/]+/[^/]+$`)
+
 var indexCSPStringCache *cspCache = newCSPCache()
 
 func getIndexContentSecurityPolicyString(cfg proto.Features, urlPath string) string {
@@ -197,7 +201,7 @@ func getIndexContentSecurityPolicyString(cfg proto.Features, urlPath string) str
 	}
 
 	// Nothing found in cache, calculate regex and result
-	withWasm := desktopSessionRe.MatchString(urlPath) || recordingRe.MatchString(urlPath)
+	withWasm := desktopSessionRe.MatchString(urlPath) || recordingRe.MatchString(urlPath) || sshSessionRe.MatchString(urlPath)
 	cspString := GetContentSecurityPolicyString(
 		getIndexContentSecurityPolicy(withWasm),
 	)

lib/httplib/httplib_test.go

@@ -327,6 +327,23 @@ func TestSetIndexContentSecurityPolicy(t *testing.T) {
 				"connect-src":     "'self' wss:",
 			},
 		},
+		{
+			name:     "for web ssh session (with wasm)",
+			features: proto.Features{},
+			urlPath:  "/web/cluster/:clusterId/console/node/:sessionId/:username",
+			expectedCspVals: map[string]string{
+				"default-src":     "'self'",
+				"base-uri":        "'self'",
+				"form-action":     "'self'",
+				"frame-ancestors": "'none'",
+				"object-src":      "'none'",
+				"script-src":      "'self' 'wasm-unsafe-eval'",
+				"style-src":       "'self' 'unsafe-inline'",
+				"img-src":         "'self' data: blob:",
+				"font-src":        "'self' data:",
+				"connect-src":     "'self' wss:",
+			},
+		},
 		{
 			name:     "for cloud based usage & desktop session, with wasm",
 			features: proto.Features{Cloud: true, IsUsageBased: true, IsStripeManaged: true},