diff options
Diffstat (limited to 'doc/libstls/index.html')
| -rw-r--r-- | doc/libstls/index.html | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/doc/libstls/index.html b/doc/libstls/index.html new file mode 100644 index 0000000..4c6819b --- /dev/null +++ b/doc/libstls/index.html @@ -0,0 +1,127 @@ +<html> + <head> + <meta name="viewport" content="width=device-width, initial-scale=1.0" /> + <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> + <meta http-equiv="Content-Language" content="en" /> + <title>s6-networking: the stls library interface</title> + <meta name="Description" content="s6-networking: the stls library interface" /> + <meta name="Keywords" content="s6-networking net stls library TLS SSL LibreSSL OpenSSL libtls" /> + <!-- <link rel="stylesheet" type="text/css" href="http://skarnet.org/default.css" /> --> + </head> +<body> + +<p> +<a href="../">s6-networking</a><br /> +<a href="http://skarnet.org/software/">Software</a><br /> +<a href="http://skarnet.org/">skarnet.org</a> +</p> + +<h1> The <tt>stls</tt> library interface </h1> + +<h2> General information </h2> + +<p> + <tt>libstls</tt> is a small support library for the +<a href="../s6-tlsc.html">s6-tlsc</a> and +<a href="../s6-tlsd.html">s6-tlsd</a> executables when they're built +against the <a href="https://www.libressl.org/">LibreSSL</a> +backend. You can use it in your own programs, but since +<a href="http://man.openbsd.org/OpenBSD-current/man3/tls_init.3">libtls</a> +is already relatively high-level, it's probably not very useful. +</p> + +<h2> Compiling </h2> + +<ul> + <li> Make sure the s6-networking headers, as well as the skalibs headers, +and the <tt>tls.h</tt> header, are visible in your header search path. </li> + <li> Use <tt>#include <s6-networking/stls.h></tt> </li> +</ul> + +<h2> Linking </h2> + +<ul> + <li> Make sure the s6-networking libraries, as well as the skalibs +libraries, and the LibreSSL libraries, are visible in your library search path. </li> + <li> Link against <tt>-lstls</tt>, <tt>-lskarnet</tt>, <tt>-ltls</tt>, +<tt>-lssl</tt>, <tt>-lcrypto</tt>, +<tt>`cat $sysdeps/socket.lib`</tt>, <tt>`cat $sysdeps/spawn.lib`</tt>, and +<tt>`cat $sysdeps/tainnow.lib`</tt>, where <tt>$sysdeps</tt> is your skalibs +sysdeps directory. </li> +</ul> + +<h2> Programming </h2> + +<h3> Running the TLS/SSL engine </h3> + +<h4> <code> int stls_run (struct tls *ctx, int *fds, unsigned int verbosity, uint32_t options, tain_t const *tto) </code> </h4> + +<p> + This function runs a full-duplex TLS/SSL engine, reading/writing +clear text from/to two file descriptors, and writing/reading +ciphertext to/from two other file descriptors, until the +connection is closed both ways (either with a SSL close, or +with EOF). +</p> + +<ul> + <li> <em>ctx</em> is a pointer to a fully initialized context, +connected to <em>fds</em>[2] and <em>fds</em>[3]. The TLS +handshake must already be completed. </li> + <li> <em>fds</em> is an array of 4 file descriptors, in this +order: fd reading clear text, fd writing clear text, fd reading +ciphertext, fd writing ciphertext. </li> + <li> <em>verbosity</em> defines the engine's verbosity: the +higher the more verbose. This parameter is currently ignored. </li> + <li> <em>options</em> is a bitfield. + <ul> + <li> bit 0 tells the engine how to behave when +the local application closes the connection (i.e. when the engine +reads EOF on <em>fds</em>[0]). If the bit is clear, then the +engine will perform as SSL close: it will send a SSL close_notify, +and stop processing incoming records, waiting for a peer +acknowledgement of the close_notify. If the bit is set, then the +engine will not send a close_notify but simply transmit EOF to +the peer, while continuing to process incoming records until it +gets EOF back. close_notify is secure when handling protocols that +are not auto-terminated (such as HTTP 0.9), but it does not permit +separate closing of both ways. EOF allows full-duplex until the +very end, but is insecure if the application protocol does not +know in advance how many bytes it should get. Modern application +protocols should all work with EOF. </li> + </ul> </li> + <li> <em>tto</em> is a pointer to a + <a href="http://skarnet.org/software/skalibs/libstddjb/tai.html">tain_t</a> +containing a relative time (i.e. a timeout). If *<em>tto</em> time elapses +with no application data being exchanged, the engine will forcibly close the +connection (with the method defined by <tt><em>options</em> & 1</tt>). + You can use <tt>&tain_infinite_relative</tt> as a value for <em>tto</em> +if you don't want the engine to ever timeout. </li> +</ul> + +<p> + <tt>stls_run</tt> will make the process die with an appropriate error +message if it encounters an error. If there were no problems and the +SSL/TLS connection closed cleanly, it returns 0. All four descriptors +in <em>fds</em> are closed when <tt>stls_run</tt> returns, but the +caller should still free <em>ctx</em> itself. +</p> + +<h4> <code> int stls_s6tlsc (char const *const *argv, char const *const *envp, tain_t const *tto, uint32_t preoptions, uint32_t options, uid_t uid, gid_t gid, unsigned int verbosity, char const *servername, int *sfd) </code> </h4> + +<p> + This function implements <a href="../s6-tlsc.html">s6-tlsc</a> on top of LibreSSL. +It has no other practical purpose; you're better off directly invoking +<a href="../s6-tlsc.html">s6-tlsc</a>. +</p> + +<h4> <code> int stls_s6tlsd (char const *const *argv, char const *const *envp, tain_t const *tto, uint32_t preoptions, uint32_t options, uid_t uid, gid_t gid, unsigned int verbosity) </code> </h4> + +<p> + This function implements <a href="../s6-tlsd.html">s6-tlsd</a> on top of LibreSSL. +It has no other practical purpose; you're better off directly invoking +<a href="../s6-tlsd.html">s6-tlsd</a>. +</p> + +</body> +</html> |