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usm: move is tls static tags #38108
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| // Unless explicitly stated otherwise all files in this repository are licensed | ||
| // under the Apache License Version 2.0. | ||
| // This product includes software developed at Datadog (https://www.datadoghq.com/). | ||
| // Copyright 2024-present Datadog, Inc. | ||
|
|
||
| // Package tls contains definitions and methods related to tags parsed from the TLS handshake | ||
| package tls | ||
|
|
||
| import ( | ||
| "crypto/tls" | ||
| "fmt" | ||
| ) | ||
|
|
||
| // Constants for tag keys | ||
| const ( | ||
| TagTLSVersion = "tls.version:" | ||
| TagTLSCipherSuiteID = "tls.cipher_suite_id:" | ||
| TagTLSClientVersion = "tls.client_version:" | ||
| version10 = "tls_1.0" | ||
| version11 = "tls_1.1" | ||
| version12 = "tls_1.2" | ||
| version13 = "tls_1.3" | ||
| ) | ||
|
|
||
| // Bitmask constants for Offered_versions matching kernelspace definitions | ||
| const ( | ||
| OfferedTLSVersion10 uint8 = 0x01 | ||
| OfferedTLSVersion11 uint8 = 0x02 | ||
| OfferedTLSVersion12 uint8 = 0x04 | ||
| OfferedTLSVersion13 uint8 = 0x08 | ||
| ) | ||
|
|
||
| // VersionTags maps TLS versions to tag names for server chosen version (exported for testing) | ||
| var VersionTags = map[uint16]string{ | ||
| tls.VersionTLS10: TagTLSVersion + version10, | ||
| tls.VersionTLS11: TagTLSVersion + version11, | ||
| tls.VersionTLS12: TagTLSVersion + version12, | ||
| tls.VersionTLS13: TagTLSVersion + version13, | ||
| } | ||
|
|
||
| // ClientVersionTags maps TLS versions to tag names for client offered versions (exported for testing) | ||
| var ClientVersionTags = map[uint16]string{ | ||
| tls.VersionTLS10: TagTLSClientVersion + version10, | ||
| tls.VersionTLS11: TagTLSClientVersion + version11, | ||
| tls.VersionTLS12: TagTLSClientVersion + version12, | ||
| tls.VersionTLS13: TagTLSClientVersion + version13, | ||
| } | ||
|
|
||
| // Mapping of offered version bitmasks to version constants | ||
| var offeredVersionBitmask = []struct { | ||
| bitMask uint8 | ||
| version uint16 | ||
| }{ | ||
| {OfferedTLSVersion10, tls.VersionTLS10}, | ||
| {OfferedTLSVersion11, tls.VersionTLS11}, | ||
| {OfferedTLSVersion12, tls.VersionTLS12}, | ||
| {OfferedTLSVersion13, tls.VersionTLS13}, | ||
| } | ||
|
|
||
| // Tags holds the TLS tags. It is used to store the TLS version, cipher suite and offered versions. | ||
| // We can't use the struct from eBPF as the definition is shared with windows. | ||
| type Tags struct { | ||
| ChosenVersion uint16 | ||
| CipherSuite uint16 | ||
| OfferedVersions uint8 | ||
| } | ||
|
|
||
| // MergeWith merges the tags from another Tags struct into this one | ||
| func (t *Tags) MergeWith(that Tags) { | ||
| if t.ChosenVersion == 0 { | ||
| t.ChosenVersion = that.ChosenVersion | ||
| } | ||
| if t.CipherSuite == 0 { | ||
| t.CipherSuite = that.CipherSuite | ||
| } | ||
| if t.OfferedVersions == 0 { | ||
| t.OfferedVersions = that.OfferedVersions | ||
| } | ||
|
|
||
| } | ||
|
|
||
| // IsEmpty returns true if all fields are zero | ||
| func (t *Tags) IsEmpty() bool { | ||
| if t == nil { | ||
| return true | ||
| } | ||
| return t.ChosenVersion == 0 && t.CipherSuite == 0 && t.OfferedVersions == 0 | ||
| } | ||
|
|
||
| // String returns a string representation of the Tags struct | ||
| func (t *Tags) String() string { | ||
| return fmt.Sprintf("ChosenVersion: %d, CipherSuite: %d, OfferedVersions: %d", t.ChosenVersion, t.CipherSuite, t.OfferedVersions) | ||
| } | ||
|
|
||
| // parseOfferedVersions parses the Offered_versions bitmask into a slice of version strings | ||
| func parseOfferedVersions(offeredVersions uint8) []string { | ||
| versions := make([]string, 0, len(offeredVersionBitmask)) | ||
| for _, ov := range offeredVersionBitmask { | ||
| if (offeredVersions & ov.bitMask) != 0 { | ||
| if name := ClientVersionTags[ov.version]; name != "" { | ||
| versions = append(versions, name) | ||
| } | ||
| } | ||
| } | ||
| return versions | ||
| } | ||
|
|
||
| func hexCipherSuiteTag(cipherSuite uint16) string { | ||
| return fmt.Sprintf("%s0x%04X", TagTLSCipherSuiteID, cipherSuite) | ||
| } | ||
|
|
||
| // GetDynamicTags generates dynamic tags based on TLS information | ||
| func (t *Tags) GetDynamicTags() map[string]struct{} { | ||
| if t.IsEmpty() { | ||
| return nil | ||
| } | ||
| tags := make(map[string]struct{}) | ||
|
|
||
| // Server chosen version | ||
| if tag, ok := VersionTags[t.ChosenVersion]; ok { | ||
| tags[tag] = struct{}{} | ||
| } | ||
|
|
||
| // Client offered versions | ||
| for _, versionName := range parseOfferedVersions(t.OfferedVersions) { | ||
| tags[versionName] = struct{}{} | ||
| } | ||
|
|
||
| // Cipher suite ID as hex string | ||
| if t.CipherSuite != 0 { | ||
| tags[hexCipherSuiteTag(t.CipherSuite)] = struct{}{} | ||
| } | ||
|
|
||
| return tags | ||
| } | ||
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