Пункт 46. SSL/TLS Encryption: Compatibility
This page covers backwards compatibility between mod_ssl and other
SSL solutions. mod_ssl is not the only SSL solution for Apache; four
additional products are (or were) also available: Ben Laurie's freely
available Apache-SSL (from
where mod_ssl were originally derived in 1998), Red Hat's commercial
Secure Web Server (which was based on mod_ssl), Covalent's commercial
Raven SSL Module (also based on
mod_ssl) and finally C2Net's (now Red Hat's) commercial product Stronghold (based
on a different evolution branch, named Sioux up to Stronghold 2.x, and
based on mod_ssl since Stronghold 3.x).
mod_ssl mostly provides a superset of the functionality of all the other
solutions, so it's simple to migrate from one of the older modules to
mod_ssl. The configuration directives and environment variable names
used by the older SSL solutions vary from those used in mod_ssl;
mapping tables are included here to give the equivalents used by mod_ssl.
Configuration Directives
The mapping between configuration directives used by Apache-SSL
1.x and mod_ssl 2.0.x is given in Table
1. The mapping from Sioux 1.x and Stronghold 2.x is only partial
because of special functionality in these interfaces which mod_ssl
doesn't provide.
Table 1: Configuration Directive Mapping
SSLEnable | SSLEngine on | compactified |
SSLDisable | SSLEngine off | compactified |
SSLLogFile file | | Use per-module LogLevel setting instead. |
SSLRequiredCiphers spec | SSLCipherSuite spec | renamed |
SSLRequireCipher c1 ... | SSLRequire %{SSL_CIPHER} in {" c1 ",
...} | generalized |
SSLBanCipher c1 ... | SSLRequire not (%{SSL_CIPHER} in {" c1 ",
...}) | generalized |
SSLFakeBasicAuth | SSLOptions +FakeBasicAuth | merged |
SSLCacheServerPath dir | - | functionality removed |
SSLCacheServerPort integer | - | functionality removed |
SSLExportClientCertificates | SSLOptions +ExportCertData | merged |
SSLCacheServerRunDir dir | - | functionality not supported |
SSL_CertFile file | SSLCertificateFile file | renamed |
SSL_KeyFile file | SSLCertificateKeyFile file | renamed |
SSL_CipherSuite arg | SSLCipherSuite arg | renamed |
SSL_X509VerifyDir arg | SSLCACertificatePath arg | renamed |
SSL_Log file | - | Use per-module LogLevel setting instead. |
SSL_Connect flag | SSLEngine flag | renamed |
SSL_ClientAuth arg | SSLVerifyClient arg | renamed |
SSL_X509VerifyDepth arg | SSLVerifyDepth arg | renamed |
SSL_FetchKeyPhraseFrom arg | - | not directly mappable; use SSLPassPhraseDialog |
SSL_SessionDir dir | - | not directly mappable; use SSLSessionCache |
SSL_Require expr | - | not directly mappable; use SSLRequire |
SSL_CertFileType arg | - | functionality not supported |
SSL_KeyFileType arg | - | functionality not supported |
SSL_X509VerifyPolicy arg | - | functionality not supported |
SSL_LogX509Attributes arg | - | functionality not supported |
StrongholdAccelerator engine | SSLCryptoDevice engine | renamed |
StrongholdKey dir | - | functionality not needed |
StrongholdLicenseFile dir | - | functionality not needed |
SSLFlag flag | SSLEngine flag | renamed |
SSLSessionLockFile file | SSLMutex file | renamed |
SSLCipherList spec | SSLCipherSuite spec | renamed |
RequireSSL | SSLRequireSSL | renamed |
SSLErrorFile file | - | functionality not supported |
SSLRoot dir | - | functionality not supported |
SSL_CertificateLogDir dir | - | functionality not supported |
AuthCertDir dir | - | functionality not supported |
SSL_Group name | - | functionality not supported |
SSLProxyMachineCertPath dir | SSLProxyMachineCertificatePath dir | renamed |
SSLProxyMachineCertFile file | SSLProxyMachineCertificateFile file | renamed |
SSLProxyCipherList spec | SSLProxyCipherSpec spec | renamed |
Environment Variables
The mapping between environment variable names used by the older
SSL solutions and the names used by mod_ssl is given in Table 2.
Table 2: Environment Variable Derivation
SSL_PROTOCOL_VERSION | SSL_PROTOCOL | renamed |
SSLEAY_VERSION | SSL_VERSION_LIBRARY | renamed |
HTTPS_SECRETKEYSIZE | SSL_CIPHER_USEKEYSIZE | renamed |
HTTPS_KEYSIZE | SSL_CIPHER_ALGKEYSIZE | renamed |
HTTPS_CIPHER | SSL_CIPHER | renamed |
HTTPS_EXPORT | SSL_CIPHER_EXPORT | renamed |
SSL_SERVER_KEY_SIZE | SSL_CIPHER_ALGKEYSIZE | renamed |
SSL_SERVER_CERTIFICATE | SSL_SERVER_CERT | renamed |
SSL_SERVER_CERT_START | SSL_SERVER_V_START | renamed |
SSL_SERVER_CERT_END | SSL_SERVER_V_END | renamed |
SSL_SERVER_CERT_SERIAL | SSL_SERVER_M_SERIAL | renamed |
SSL_SERVER_SIGNATURE_ALGORITHM | SSL_SERVER_A_SIG | renamed |
SSL_SERVER_DN | SSL_SERVER_S_DN | renamed |
SSL_SERVER_CN | SSL_SERVER_S_DN_CN | renamed |
SSL_SERVER_EMAIL | SSL_SERVER_S_DN_Email | renamed |
SSL_SERVER_O | SSL_SERVER_S_DN_O | renamed |
SSL_SERVER_OU | SSL_SERVER_S_DN_OU | renamed |
SSL_SERVER_C | SSL_SERVER_S_DN_C | renamed |
SSL_SERVER_SP | SSL_SERVER_S_DN_SP | renamed |
SSL_SERVER_L | SSL_SERVER_S_DN_L | renamed |
SSL_SERVER_IDN | SSL_SERVER_I_DN | renamed |
SSL_SERVER_ICN | SSL_SERVER_I_DN_CN | renamed |
SSL_SERVER_IEMAIL | SSL_SERVER_I_DN_Email | renamed |
SSL_SERVER_IO | SSL_SERVER_I_DN_O | renamed |
SSL_SERVER_IOU | SSL_SERVER_I_DN_OU | renamed |
SSL_SERVER_IC | SSL_SERVER_I_DN_C | renamed |
SSL_SERVER_ISP | SSL_SERVER_I_DN_SP | renamed |
SSL_SERVER_IL | SSL_SERVER_I_DN_L | renamed |
SSL_CLIENT_CERTIFICATE | SSL_CLIENT_CERT | renamed |
SSL_CLIENT_CERT_START | SSL_CLIENT_V_START | renamed |
SSL_CLIENT_CERT_END | SSL_CLIENT_V_END | renamed |
SSL_CLIENT_CERT_SERIAL | SSL_CLIENT_M_SERIAL | renamed |
SSL_CLIENT_SIGNATURE_ALGORITHM | SSL_CLIENT_A_SIG | renamed |
SSL_CLIENT_DN | SSL_CLIENT_S_DN | renamed |
SSL_CLIENT_CN | SSL_CLIENT_S_DN_CN | renamed |
SSL_CLIENT_EMAIL | SSL_CLIENT_S_DN_Email | renamed |
SSL_CLIENT_O | SSL_CLIENT_S_DN_O | renamed |
SSL_CLIENT_OU | SSL_CLIENT_S_DN_OU | renamed |
SSL_CLIENT_C | SSL_CLIENT_S_DN_C | renamed |
SSL_CLIENT_SP | SSL_CLIENT_S_DN_SP | renamed |
SSL_CLIENT_L | SSL_CLIENT_S_DN_L | renamed |
SSL_CLIENT_IDN | SSL_CLIENT_I_DN | renamed |
SSL_CLIENT_ICN | SSL_CLIENT_I_DN_CN | renamed |
SSL_CLIENT_IEMAIL | SSL_CLIENT_I_DN_Email | renamed |
SSL_CLIENT_IO | SSL_CLIENT_I_DN_O | renamed |
SSL_CLIENT_IOU | SSL_CLIENT_I_DN_OU | renamed |
SSL_CLIENT_IC | SSL_CLIENT_I_DN_C | renamed |
SSL_CLIENT_ISP | SSL_CLIENT_I_DN_SP | renamed |
SSL_CLIENT_IL | SSL_CLIENT_I_DN_L | renamed |
SSL_EXPORT | SSL_CIPHER_EXPORT | renamed |
SSL_KEYSIZE | SSL_CIPHER_ALGKEYSIZE | renamed |
SSL_SECKEYSIZE | SSL_CIPHER_USEKEYSIZE | renamed |
SSL_SSLEAY_VERSION | SSL_VERSION_LIBRARY | renamed |
SSL_STRONG_CRYPTO | - | Not supported by mod_ssl |
SSL_SERVER_KEY_EXP | - | Not supported by mod_ssl |
SSL_SERVER_KEY_ALGORITHM | - | Not supported by mod_ssl |
SSL_SERVER_KEY_SIZE | - | Not supported by mod_ssl |
SSL_SERVER_SESSIONDIR | - | Not supported by mod_ssl |
SSL_SERVER_CERTIFICATELOGDIR | - | Not supported by mod_ssl |
SSL_SERVER_CERTFILE | - | Not supported by mod_ssl |
SSL_SERVER_KEYFILE | - | Not supported by mod_ssl |
SSL_SERVER_KEYFILETYPE | - | Not supported by mod_ssl |
SSL_CLIENT_KEY_EXP | - | Not supported by mod_ssl |
SSL_CLIENT_KEY_ALGORITHM | - | Not supported by mod_ssl |
SSL_CLIENT_KEY_SIZE | - | Not supported by mod_ssl |
Custom Log Functions
When mod_ssl is enabled, additional functions exist for the Custom Log Format of
mod_log_config as documented in the Reference
Chapter. Beside the `` %{ varname }x ''
eXtension format function which can be used to expand any variables provided
by any module, an additional Cryptography
`` %{ name }c '' cryptography format function
exists for backward compatibility. The currently implemented function calls
are listed in Table 3.
Table 3: Custom Log Cryptography Function
| Function Call | Description |
|---|
%...{version}c | SSL protocol version |
%...{cipher}c | SSL cipher |
%...{subjectdn}c | Client Certificate Subject Distinguished Name |
%...{issuerdn}c | Client Certificate Issuer Distinguished Name |
%...{errcode}c | Certificate Verification Error (numerical) |
%...{errstr}c | Certificate Verification Error (string) |
