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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,194 @@ | ||
| // Author: yuweizzz <yuwei764969238@gmail.com>. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package module | ||
|
|
||
| import ( | ||
| "debug/elf" | ||
| "fmt" | ||
| "os" | ||
| "path" | ||
| "regexp" | ||
|
|
||
| "github.com/gojue/ecapture/user/config" | ||
| ) | ||
|
|
||
| const GnuTLSDefaultVersion = "3.6.12" | ||
| const GnuTLSVersionLen = 32 | ||
|
|
||
| func readelf(binaryPath string) (string, error) { | ||
| f, err := os.OpenFile(binaryPath, os.O_RDONLY, os.ModePerm) | ||
| if err != nil { | ||
| return "", fmt.Errorf("Can not open %s, with error: %v", binaryPath, err) | ||
| } | ||
| defer f.Close() | ||
| r, err := elf.NewFile(f) | ||
| if err != nil { | ||
| return "", fmt.Errorf("Parse the ELF file %s failed, with error: %v", binaryPath, err) | ||
| } | ||
| defer r.Close() | ||
|
|
||
| switch r.FileHeader.Machine { | ||
| case elf.EM_X86_64: | ||
| case elf.EM_AARCH64: | ||
| default: | ||
| return "", fmt.Errorf( | ||
| "Unsupported arch library, ELF Header Machine is: %s, must be one of EM_X86_64 and EM_AARCH64", | ||
| r.FileHeader.Machine.String()) | ||
| } | ||
|
|
||
| s := r.Section(".rodata") | ||
| if s == nil { | ||
| // .rodata not found | ||
| return "", fmt.Errorf("Detect GnuTLS version failed, cant read .rodata section from %s", binaryPath) | ||
| } | ||
|
|
||
| sectionOffset := int64(s.Offset) | ||
| sectionSize := s.Size | ||
|
|
||
| _, err = f.Seek(0, 0) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| ret, err := f.Seek(sectionOffset, 0) | ||
| if ret != sectionOffset || err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| rex, err := regexp.Compile(`Enabled GnuTLS ([0-9\.]+) logging...`) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| buf := make([]byte, 1024*1024) // 1Mb | ||
| totalReadCount := 0 | ||
| for totalReadCount < int(sectionSize) { | ||
| readCount, err := f.Read(buf) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| if readCount == 0 { | ||
| break | ||
| } | ||
|
|
||
| match := rex.FindSubmatch(buf) | ||
| if len(match) == 2 { | ||
| return string(match[1]), nil | ||
| } | ||
|
|
||
| // just like "probe_openssl_lib.go", | ||
| // "Enabled GnuTLS 3.x.xx logging..." is 32 chars. | ||
| totalReadCount += readCount - GnuTLSVersionLen | ||
|
|
||
| _, err = f.Seek(sectionOffset+int64(totalReadCount), 0) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| clear(buf) | ||
| } | ||
| return "", fmt.Errorf("Unknown error") | ||
| } | ||
|
|
||
| func (m *MGnutlsProbe) detectGnutls() error { | ||
| var binaryPath string | ||
| switch m.conf.(*config.GnutlsConfig).ElfType { | ||
| case config.ElfTypeSo: | ||
| binaryPath = m.conf.(*config.GnutlsConfig).Gnutls | ||
| default: | ||
| // Default: "/lib/x86_64-linux-gnu/libgnutls.so.30" | ||
| binaryPath = path.Join(defaultSoPath, "libgnutls.so.30") | ||
| } | ||
| _, err := os.Stat(binaryPath) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| ConfigSslVersion := m.conf.(*config.GnutlsConfig).SslVersion | ||
| if len(ConfigSslVersion) > 0 { | ||
| m.sslVersion = ConfigSslVersion | ||
| m.logger.Info().Str("GnuTLS Version", m.sslVersion).Msg("GnuTLS version configured") | ||
| } else { | ||
| sslVersion, err := readelf(binaryPath) | ||
| if err != nil { | ||
| m.logger.Error().Err(err) | ||
| } | ||
| m.sslVersion = sslVersion | ||
| if len(m.sslVersion) == 0 { | ||
| m.logger.Warn().Str("GnuTLS Version", GnuTLSDefaultVersion).Msg("GnuTLS version not found, used default version") | ||
| m.sslVersion = GnuTLSDefaultVersion | ||
| } | ||
| m.logger.Info().Str("Version", m.sslVersion).Msg("GnuTLS version found") | ||
| } | ||
|
|
||
| m.logger.Info().Str("binaryPath", binaryPath).Uint8("elfType", m.conf.(*config.GnutlsConfig).ElfType).Msg("GnuTLS binary path") | ||
| switch m.sslVersion { | ||
| case "3.8.7": | ||
| m.sslBpfFile = m.geteBPFName("user/bytecode/gnutls_3_8_7_kern.o") | ||
| case "3.8.6": | ||
| fallthrough | ||
| case "3.8.5": | ||
| fallthrough | ||
| case "3.8.4": | ||
| m.sslBpfFile = m.geteBPFName("user/bytecode/gnutls_3_8_4_kern.o") | ||
| case "3.8.3": | ||
| fallthrough | ||
| case "3.8.2": | ||
| fallthrough | ||
| case "3.8.1": | ||
| fallthrough | ||
| case "3.8.0": | ||
| fallthrough | ||
| case "3.7.11": | ||
| fallthrough | ||
| case "3.7.10": | ||
| fallthrough | ||
| case "3.7.9": | ||
| fallthrough | ||
| case "3.7.8": | ||
| fallthrough | ||
| case "3.7.7": | ||
| m.sslBpfFile = m.geteBPFName("user/bytecode/gnutls_3_7_7_kern.o") | ||
| case "3.7.6": | ||
| fallthrough | ||
| case "3.7.5": | ||
| fallthrough | ||
| case "3.7.4": | ||
| fallthrough | ||
| case "3.7.3": | ||
| m.sslBpfFile = m.geteBPFName("user/bytecode/gnutls_3_7_3_kern.o") | ||
| case "3.7.2": | ||
| fallthrough | ||
| case "3.7.1": | ||
| fallthrough | ||
| case "3.7.0": | ||
| m.sslBpfFile = m.geteBPFName("user/bytecode/gnutls_3_7_0_kern.o") | ||
| case "3.6.16": | ||
| fallthrough | ||
| case "3.6.15": | ||
| fallthrough | ||
| case "3.6.14": | ||
| m.sslBpfFile = m.geteBPFName("user/bytecode/gnutls_3_6_14_kern.o") | ||
| case "3.6.13": | ||
| fallthrough | ||
| case "3.6.12": | ||
| m.sslBpfFile = m.geteBPFName("user/bytecode/gnutls_3_6_12_kern.o") | ||
| default: | ||
| m.sslBpfFile = m.geteBPFName("user/bytecode/gnutls_3_6_12_kern.o") | ||
| m.logger.Warn().Msg("GnuTLS version not supported, used default bpf bytecode file") | ||
| } | ||
| m.logger.Info().Str("bytecode filename", m.sslBpfFile).Msg("BPF bytecode loaded") | ||
| return nil | ||
| } |
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