func()

in pkg/tools/ssl/openssl.go [85:145]

• 39 lines of code
• 12 McCabe index (conditional complexity)

func (r *Register) buildOpenSSLSymAddrConfig(libcryptoPath string) (*OpenSSLSymbolAddresses, error) {
	// using "strings" command to query the symbol in the libcrypto library
	result, err := exec.Command("strings", libcryptoPath).Output()
	if err != nil {
		return nil, err
	}
	for _, p := range strings.Split(string(result), "\n") {
		submatch := openSSLVersionRegex.FindStringSubmatch(p)
		if len(submatch) != 4 {
			continue
		}
		major := submatch[1]
		minor := submatch[2]
		fix := submatch[3]

		log.Debugf("found the libcrypto.so version: %s.%s.%s", major, minor, fix)
		conf := &OpenSSLSymbolAddresses{}

		// must be number, already validate in the regex
		majorVal, _ := strconv.Atoi(major)
		minorVal, _ := strconv.Atoi(minor)
		fixVal, _ := strconv.Atoi(fix)

		// max support version is 3.0.x
		if majorVal > 3 || (majorVal == 3 && minorVal > 0) {
			return nil, fmt.Errorf("the version of the libcrypto is not support: %s.%s.%s", major, minor, fix)
		}

		// bio offset
		// https://github.com/openssl/openssl/blob/OpenSSL_1_0_0-stable/ssl/ssl.h#L1093-L1111
		// https://github.com/openssl/openssl/blob/OpenSSL_1_1_1-stable/ssl/ssl_local.h#L1068-L1083
		// https://github.com/openssl/openssl/blob/openssl-3.0.7/ssl/ssl_local.h#L1212-L1227
		conf.BIOReadOffset = 16
		conf.BIOWriteOffset = 24
		// fd offset
		if majorVal == 3 && minorVal == 0 {
			// 3.0.x
			// https://github.com/openssl/openssl/blob/openssl-3.0.7/crypto/bio/bio_local.h#L115-L128
			// OPENSSL_NO_DEPRECATED_3_0 is not defined by default unless the user pass the specific build option
			conf.FDOffset = 56
			// https://github.com/openssl/openssl/blob/openssl-3.0.7/ssl/ssl_local.h#L1212-L1245
			conf.RoleOffset = 56
		} else if (minorVal == 0) || (minorVal == 1 && fixVal == 0) {
			// 1.0.x || 1.1.0
			// https://github.com/openssl/openssl/blob/OpenSSL_1_0_0-stable/crypto/bio/bio.h#L297-L306
			conf.FDOffset = 40
			// https://github.com/openssl/openssl/blob/OpenSSL_1_0_0-stable/ssl/ssl.h#L1093-L1138
			conf.RoleOffset = 72
		} else {
			// 1.1.1
			// https://github.com/openssl/openssl/blob/OpenSSL_1_1_1-stable/crypto/bio/bio_local.h#L115-L125
			conf.FDOffset = 48
			// https://github.com/openssl/openssl/blob/OpenSSL_1_1_1-stable/ssl/ssl_local.h#L1068-L1101
			conf.RoleOffset = 56
		}
		log.Debugf("the lobcrypto.so library symbol verson config, version: %s.%s.%s, bio offset: %d",
			major, minor, fix, conf.FDOffset)
		return conf, nil
	}
	return nil, fmt.Errorf("could not fount the version of the libcrypto.so")
}