feat(common.tls): Allow group aliases for ciphersuites (#15570)

plugins/common/tls/client.conf

@@ -14,8 +14,10 @@
   ## Minimal TLS version to accept by the client
   # tls_min_version = "TLS12"
   ## List of ciphers to accept, by default all secure ciphers will be accepted
-  ## See https://pkg.go.dev/crypto/tls#pkg-constants for supported values
-  # tls_cipher_suites = []
+  ## See https://pkg.go.dev/crypto/tls#pkg-constants for supported values.
+  ## Use "all", "secure" and "insecure" to add all support ciphers, secure
+  ## suites or insecure suites respectively.
+  # tls_cipher_suites = ["secure"]
   ## Renegotiation method, "never", "once" or "freely"
   # tls_renegotiation_method = "never"
   ## Use TLS but skip chain & host verification

plugins/common/tls/utils.go

@@ -41,17 +41,57 @@ func Ciphers() (secure, insecure []string) {
 func ParseCiphers(ciphers []string) ([]uint16, error) {
 	suites := []uint16{}
 
+	added := make(map[uint16]bool, len(ciphers))
 	for _, c := range ciphers {
-		cipher := strings.ToUpper(c)
-		id, ok := tlsCipherMapSecure[cipher]
-		if !ok {
-			idInsecure, ok := tlsCipherMapInsecure[cipher]
+		// Handle meta-keywords
+		switch c {
+		case "all":
+			for _, id := range tlsCipherMapInsecure {
+				if added[id] {
+					continue
+				}
+				suites = append(suites, id)
+				added[id] = true
+			}
+			for _, id := range tlsCipherMapSecure {
+				if added[id] {
+					continue
+				}
+				suites = append(suites, id)
+				added[id] = true
+			}
+		case "insecure":
+			for _, id := range tlsCipherMapInsecure {
+				if added[id] {
+					continue
+				}
+				suites = append(suites, id)
+				added[id] = true
+			}
+		case "secure":
+			for _, id := range tlsCipherMapSecure {
+				if added[id] {
+					continue
+				}
+				suites = append(suites, id)
+				added[id] = true
+			}
+		default:
+			cipher := strings.ToUpper(c)
+			id, ok := tlsCipherMapSecure[cipher]
 			if !ok {
-				return nil, fmt.Errorf("%q %w", cipher, ErrCipherUnsupported)
+				idInsecure, ok := tlsCipherMapInsecure[cipher]
+				if !ok {
+					return nil, fmt.Errorf("%q %w", cipher, ErrCipherUnsupported)
+				}
+				id = idInsecure
+			}
+			if added[id] {
+				continue
 			}
-			id = idInsecure
+			suites = append(suites, id)
+			added[id] = true
 		}
-		suites = append(suites, id)
 	}
 
 	return suites, nil

plugins/inputs/gnmi/README.md

@@ -108,8 +108,10 @@ details on how to use them.
   ## Minimal TLS version to accept by the client
   # tls_min_version = "TLS12"
   ## List of ciphers to accept, by default all secure ciphers will be accepted
-  ## See https://pkg.go.dev/crypto/tls#pkg-constants for supported values
-  # tls_cipher_suites = []
+  ## See https://pkg.go.dev/crypto/tls#pkg-constants for supported values.
+  ## Use "all", "secure" and "insecure" to add all support ciphers, secure
+  ## suites or insecure suites respectively.
+  # tls_cipher_suites = ["secure"]
   ## Renegotiation method, "never", "once" or "freely"
   # tls_renegotiation_method = "never"
   ## Use TLS but skip chain & host verification

plugins/inputs/gnmi/sample.conf

@@ -61,8 +61,10 @@
   ## Minimal TLS version to accept by the client
   # tls_min_version = "TLS12"
   ## List of ciphers to accept, by default all secure ciphers will be accepted
-  ## See https://pkg.go.dev/crypto/tls#pkg-constants for supported values
-  # tls_cipher_suites = []
+  ## See https://pkg.go.dev/crypto/tls#pkg-constants for supported values.
+  ## Use "all", "secure" and "insecure" to add all support ciphers, secure
+  ## suites or insecure suites respectively.
+  # tls_cipher_suites = ["secure"]
   ## Renegotiation method, "never", "once" or "freely"
   # tls_renegotiation_method = "never"
   ## Use TLS but skip chain & host verification

plugins/inputs/http/README.md

@@ -84,8 +84,10 @@ to use them.
   ## Minimal TLS version to accept by the client
   # tls_min_version = "TLS12"
   ## List of ciphers to accept, by default all secure ciphers will be accepted
-  ## See https://pkg.go.dev/crypto/tls#pkg-constants for supported values
-  # tls_cipher_suites = []
+  ## See https://pkg.go.dev/crypto/tls#pkg-constants for supported values.
+  ## Use "all", "secure" and "insecure" to add all support ciphers, secure
+  ## suites or insecure suites respectively.
+  # tls_cipher_suites = ["secure"]
   ## Renegotiation method, "never", "once" or "freely"
   # tls_renegotiation_method = "never"
   ## Use TLS but skip chain & host verification

plugins/inputs/http/sample.conf

@@ -55,8 +55,10 @@
   ## Minimal TLS version to accept by the client
   # tls_min_version = "TLS12"
   ## List of ciphers to accept, by default all secure ciphers will be accepted
-  ## See https://pkg.go.dev/crypto/tls#pkg-constants for supported values
-  # tls_cipher_suites = []
+  ## See https://pkg.go.dev/crypto/tls#pkg-constants for supported values.
+  ## Use "all", "secure" and "insecure" to add all support ciphers, secure
+  ## suites or insecure suites respectively.
+  # tls_cipher_suites = ["secure"]
   ## Renegotiation method, "never", "once" or "freely"
   # tls_renegotiation_method = "never"
   ## Use TLS but skip chain & host verification

plugins/inputs/ldap/README.md

@@ -55,8 +55,10 @@ See the [CONFIGURATION.md][CONFIGURATION.md] for more details.
   ## Minimal TLS version to accept by the client
   # tls_min_version = "TLS12"
   ## List of ciphers to accept, by default all secure ciphers will be accepted
-  ## See https://pkg.go.dev/crypto/tls#pkg-constants for supported values
-  # tls_cipher_suites = []
+  ## See https://pkg.go.dev/crypto/tls#pkg-constants for supported values.
+  ## Use "all", "secure" and "insecure" to add all support ciphers, secure
+  ## suites or insecure suites respectively.
+  # tls_cipher_suites = ["secure"]
   ## Renegotiation method, "never", "once" or "freely"
   # tls_renegotiation_method = "never"
   ## Use TLS but skip chain & host verification

plugins/inputs/ldap/sample.conf

@@ -37,8 +37,10 @@
   ## Minimal TLS version to accept by the client
   # tls_min_version = "TLS12"
   ## List of ciphers to accept, by default all secure ciphers will be accepted
-  ## See https://pkg.go.dev/crypto/tls#pkg-constants for supported values
-  # tls_cipher_suites = []
+  ## See https://pkg.go.dev/crypto/tls#pkg-constants for supported values.
+  ## Use "all", "secure" and "insecure" to add all support ciphers, secure
+  ## suites or insecure suites respectively.
+  # tls_cipher_suites = ["secure"]
   ## Renegotiation method, "never", "once" or "freely"
   # tls_renegotiation_method = "never"
   ## Use TLS but skip chain & host verification