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/* ISC license. */
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <bearssl.h>
#include <skalibs/strerr2.h>
#include <skalibs/tai.h>
#include <skalibs/env.h>
#include <skalibs/stralloc.h>
#include <skalibs/genalloc.h>
#include <skalibs/djbunix.h>
#include <skalibs/random.h>
#include <s6-networking/s6net-utils.h>
#include <s6-networking/sbearssl.h>
int sbearssl_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)
{
int fds[4] = { sfd[0], sfd[1], sfd[0], sfd[1] } ;
stralloc storage = STRALLOC_ZERO ;
genalloc tas = GENALLOC_ZERO ;
size_t talen ;
if (preoptions & 1)
strerr_dief1x(100, "client certificates are not supported by BearSSL yet") ;
{
int r ;
char const *x = env_get2(envp, "CADIR") ;
if (x)
r = sbearssl_ta_readdir(x, &tas, &storage) ;
else
{
x = env_get2(envp, "CAFILE") ;
if (!x) strerr_dienotset(100, "CADIR or CAFILE") ;
r = sbearssl_ta_readfile(x, &tas, &storage) ;
}
if (r < 0)
strerr_diefu2sys(111, "read trust anchors in ", x) ;
else if (r)
strerr_diefu4x(96, "read trust anchors in ", x, ": ", sbearssl_error_str(r)) ;
talen = genalloc_len(sbearssl_ta, &tas) ;
if (!talen)
strerr_dief2x(96, "no trust anchor found in ", x) ;
}
{
unsigned char buf[BR_SSL_BUFSIZE_BIDI] ;
br_x509_minimal_context xc ;
br_ssl_client_context cc ;
br_x509_trust_anchor btas[talen] ;
size_t i = talen ;
pid_t pid ;
stralloc_shrink(&storage) ;
while (i--)
sbearssl_ta_to(genalloc_s(sbearssl_ta, &tas) + i, btas + i, storage.s) ;
genalloc_free(sbearssl_ta, &tas) ;
br_ssl_client_init_full(&cc, &xc, btas, talen) ;
if (!random_init())
strerr_diefu1sys(111, "initialize random generator") ;
random_string((char *)buf, 32) ;
br_ssl_engine_inject_entropy(&cc.eng, buf, 32) ;
random_finish() ;
pid = s6net_clean_tls_and_spawn(argv, envp, fds, !!(preoptions & 2)) ;
if (gid && setgid(gid) < 0) strerr_diefu1sys(111, "setgid") ;
if (uid && setuid(uid) < 0) strerr_diefu1sys(111, "setuid") ;
br_ssl_engine_set_buffer(&cc.eng, buf, sizeof(buf), 1) ;
if (!br_ssl_client_reset(&cc, servername, 0))
strerr_diefu2x(97, "reset client context: ", sbearssl_error_str(br_ssl_engine_last_error(&cc.eng))) ;
{
int wstat ;
int r = sbearssl_run(&cc.eng, fds, verbosity, options, tto) ;
if (r < 0) strerr_diefu1sys(111, "run SSL engine") ;
else if (r) strerr_diefu3x(98, "run SSL engine", ": ", sbearssl_error_str(r)) ;
if (wait_pid(pid, &wstat) < 0) strerr_diefu1sys(111, "wait_pid") ;
return wait_estatus(wstat) ;
}
}
}
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