solanum/ircd/sslproc.c

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2008-04-06 16:33:34 +00:00
/*
* sslproc.c: An interface to ssld
* Copyright (C) 2007 Aaron Sethman <androsyn@ratbox.org>
* Copyright (C) 2007 ircd-ratbox development team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
* USA
*/
#include <rb_lib.h>
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#include "stdinc.h"
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#include "s_conf.h"
#include "logger.h"
#include "listener.h"
#include "sslproc.h"
#include "s_serv.h"
#include "ircd.h"
#include "hash.h"
#include "client.h"
#include "send.h"
#include "packet.h"
#include "certfp.h"
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static void ssl_read_ctl(rb_fde_t * F, void *data);
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static int ssld_count;
static char tmpbuf[READBUF_SIZE];
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static char nul = '\0';
#define MAXPASSFD 4
#define READSIZE 1024
typedef struct _ssl_ctl_buf
{
rb_dlink_node node;
char *buf;
size_t buflen;
rb_fde_t *F[MAXPASSFD];
int nfds;
} ssl_ctl_buf_t;
struct _ssl_ctl
{
rb_dlink_node node;
int cli_count;
rb_fde_t *F;
rb_fde_t *P;
pid_t pid;
rb_dlink_list readq;
rb_dlink_list writeq;
uint8_t shutdown;
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uint8_t dead;
char version[256];
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};
static void ssld_update_config_one(ssl_ctl_t *ctl);
static void send_new_ssl_certs_one(ssl_ctl_t * ctl);
static void send_certfp_method(ssl_ctl_t *ctl);
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static rb_dlink_list ssl_daemons;
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static inline uint32_t
buf_to_uint32(char *buf)
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{
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uint32_t x;
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memcpy(&x, buf, sizeof(x));
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return x;
}
static inline void
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uint32_to_buf(char *buf, uint32_t x)
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{
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memcpy(buf, &x, sizeof(x));
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return;
}
static ssl_ctl_t *
allocate_ssl_daemon(rb_fde_t * F, rb_fde_t * P, int pid)
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{
ssl_ctl_t *ctl;
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if(F == NULL || pid < 0)
return NULL;
ctl = rb_malloc(sizeof(ssl_ctl_t));
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ctl->F = F;
ctl->P = P;
ctl->pid = pid;
ssld_count++;
rb_dlinkAdd(ctl, &ctl->node, &ssl_daemons);
return ctl;
}
static void
free_ssl_daemon(ssl_ctl_t * ctl)
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{
rb_dlink_node *ptr;
ssl_ctl_buf_t *ctl_buf;
int x;
if(ctl->cli_count)
return;
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RB_DLINK_FOREACH(ptr, ctl->readq.head)
{
ctl_buf = ptr->data;
for(x = 0; x < ctl_buf->nfds; x++)
rb_close(ctl_buf->F[x]);
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rb_free(ctl_buf->buf);
rb_free(ctl_buf);
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}
RB_DLINK_FOREACH(ptr, ctl->writeq.head)
{
ctl_buf = ptr->data;
for(x = 0; x < ctl_buf->nfds; x++)
rb_close(ctl_buf->F[x]);
rb_free(ctl_buf->buf);
rb_free(ctl_buf);
}
rb_close(ctl->F);
rb_close(ctl->P);
rb_dlinkDelete(&ctl->node, &ssl_daemons);
rb_free(ctl);
}
static char *ssld_path;
static int ssld_spin_count = 0;
static time_t last_spin;
static int ssld_wait = 0;
void
restart_ssld(void)
{
rb_dlink_node *ptr, *next;
ssl_ctl_t *ctl;
RB_DLINK_FOREACH_SAFE(ptr, next, ssl_daemons.head)
{
ctl = ptr->data;
if(ctl->dead)
continue;
if(ctl->shutdown)
continue;
ctl->shutdown = 1;
ssld_count--;
if(!ctl->cli_count)
{
rb_kill(ctl->pid, SIGKILL);
free_ssl_daemon(ctl);
}
}
ssld_spin_count = 0;
last_spin = 0;
ssld_wait = 0;
start_ssldaemon(ServerInfo.ssld_count);
}
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static void
ssl_killall(void)
{
rb_dlink_node *ptr, *next;
ssl_ctl_t *ctl;
RB_DLINK_FOREACH_SAFE(ptr, next, ssl_daemons.head)
{
ctl = ptr->data;
if(ctl->dead)
continue;
ctl->dead = 1;
if(!ctl->shutdown)
ssld_count--;
rb_kill(ctl->pid, SIGKILL);
if(!ctl->cli_count)
free_ssl_daemon(ctl);
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}
}
static void
ssl_dead(ssl_ctl_t * ctl)
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{
if(ctl->dead)
return;
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ctl->dead = 1;
rb_kill(ctl->pid, SIGKILL); /* make sure the process is really gone */
if(!ctl->shutdown)
{
ssld_count--;
ilog(L_MAIN, "ssld helper died - attempting to restart");
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sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "ssld helper died - attempting to restart");
start_ssldaemon(1);
}
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}
static void
ssl_do_pipe(rb_fde_t * F, void *data)
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{
int retlen;
ssl_ctl_t *ctl = data;
retlen = rb_write(F, "0", 1);
if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno)))
{
ssl_dead(ctl);
return;
}
rb_setselect(F, RB_SELECT_READ, ssl_do_pipe, data);
}
static void
restart_ssld_event(void *unused)
{
ssld_spin_count = 0;
last_spin = 0;
ssld_wait = 0;
if(ServerInfo.ssld_count > get_ssld_count())
{
int start = ServerInfo.ssld_count - get_ssld_count();
ilog(L_MAIN, "Attempting to restart ssld processes");
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sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "Attempt to restart ssld processes");
start_ssldaemon(start);
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}
}
int
start_ssldaemon(int count)
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{
rb_fde_t *F1, *F2;
rb_fde_t *P1, *P2;
char fullpath[PATH_MAX + 1];
char fdarg[6];
const char *parv[2];
char buf[128];
char s_pid[10];
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pid_t pid;
int started = 0, i;
if(ssld_wait)
return 0;
if(ssld_spin_count > 20 && (rb_current_time() - last_spin < 5))
{
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ilog(L_MAIN, "ssld helper is spinning - will attempt to restart in 1 minute");
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sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"ssld helper is spinning - will attempt to restart in 1 minute");
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rb_event_add("restart_ssld_event", restart_ssld_event, NULL, 60);
ssld_wait = 1;
return 0;
}
ssld_spin_count++;
last_spin = rb_current_time();
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if(ssld_path == NULL)
{
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snprintf(fullpath, sizeof(fullpath), "%s/ssld", ircd_paths[IRCD_PATH_LIBEXEC]);
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if(access(fullpath, X_OK) == -1)
{
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snprintf(fullpath, sizeof(fullpath), "%s/bin/ssld", ConfigFileEntry.dpath);
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if(access(fullpath, X_OK) == -1)
{
ilog(L_MAIN,
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"Unable to execute ssld in %s or %s/bin",
ircd_paths[IRCD_PATH_LIBEXEC], ConfigFileEntry.dpath);
return 0;
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}
}
ssld_path = rb_strdup(fullpath);
}
rb_strlcpy(buf, "-ircd ssld daemon", sizeof(buf));
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parv[0] = buf;
parv[1] = NULL;
for(i = 0; i < count; i++)
{
ssl_ctl_t *ctl;
if(rb_socketpair(AF_UNIX, SOCK_DGRAM, 0, &F1, &F2, "SSL/TLS handle passing socket") == -1)
{
ilog(L_MAIN, "Unable to create ssld - rb_socketpair failed: %s", strerror(errno));
return started;
}
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rb_set_buffers(F1, READBUF_SIZE);
rb_set_buffers(F2, READBUF_SIZE);
snprintf(fdarg, sizeof(fdarg), "%d", rb_get_fd(F2));
rb_setenv("CTL_FD", fdarg, 1);
if(rb_pipe(&P1, &P2, "SSL/TLS pipe") == -1)
{
ilog(L_MAIN, "Unable to create ssld - rb_pipe failed: %s", strerror(errno));
return started;
}
snprintf(fdarg, sizeof(fdarg), "%d", rb_get_fd(P1));
rb_setenv("CTL_PIPE", fdarg, 1);
snprintf(s_pid, sizeof(s_pid), "%d", (int)getpid());
rb_setenv("CTL_PPID", s_pid, 1);
rb_clear_cloexec(F2);
rb_clear_cloexec(P1);
pid = rb_spawn_process(ssld_path, (const char **) parv);
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if(pid == -1)
{
ilog(L_MAIN, "Unable to create ssld: %s\n", strerror(errno));
rb_close(F1);
rb_close(F2);
rb_close(P1);
rb_close(P2);
return started;
}
started++;
rb_close(F2);
rb_close(P1);
ctl = allocate_ssl_daemon(F1, P2, pid);
if(ircd_ssl_ok)
ssld_update_config_one(ctl);
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ssl_read_ctl(ctl->F, ctl);
ssl_do_pipe(P2, ctl);
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}
return started;
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}
static void
ssl_process_open_fd(ssl_ctl_t * ctl, ssl_ctl_buf_t * ctl_buf)
{
struct Client *client_p;
uint32_t fd;
if(ctl_buf->buflen < 5)
return; /* bogus message..drop it.. XXX should warn here */
fd = buf_to_uint32(&ctl_buf->buf[1]);
client_p = find_cli_connid_hash(fd);
if(client_p == NULL || client_p->localClient == NULL)
return;
if(client_p->localClient->ssl_callback)
{
SSL_OPEN_CB *hdl = client_p->localClient->ssl_callback;
client_p->localClient->ssl_callback = NULL;
hdl(client_p, RB_OK);
}
}
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static void
ssl_process_dead_fd(ssl_ctl_t * ctl, ssl_ctl_buf_t * ctl_buf)
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{
struct Client *client_p;
char reason[256];
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uint32_t fd;
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if(ctl_buf->buflen < 6)
return; /* bogus message..drop it.. XXX should warn here */
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fd = buf_to_uint32(&ctl_buf->buf[1]);
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rb_strlcpy(reason, &ctl_buf->buf[5], sizeof(reason));
client_p = find_cli_connid_hash(fd);
if(client_p == NULL || client_p->localClient == NULL)
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return;
if(IsAnyServer(client_p))
{
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sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "ssld error for %s: %s", client_p->name, reason);
ilog(L_SERVER, "ssld error for %s: %s", log_client_name(client_p, SHOW_IP), reason);
}
/* if there is still a pending callback, call it now */
if(client_p->localClient->ssl_callback)
{
SSL_OPEN_CB *hdl = client_p->localClient->ssl_callback;
client_p->localClient->ssl_callback = NULL;
if (hdl(client_p, RB_ERROR_SSL))
{
/* the callback has exited the client */
return;
}
}
if(IsAnyServer(client_p) || IsRegistered(client_p))
{
/* read any last moment ERROR, QUIT or the like -- jilles */
if (!strcmp(reason, "Remote host closed the connection"))
read_packet(client_p->localClient->F, client_p);
if (IsAnyDead(client_p))
return;
}
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exit_client(client_p, client_p, &me, reason);
}
static void
ssl_process_cipher_string(ssl_ctl_t *ctl, ssl_ctl_buf_t *ctl_buf)
{
struct Client *client_p;
const char *cstring;
uint32_t fd;
if(ctl_buf->buflen < 6)
return; /* bogus message..drop it.. XXX should warn here */
fd = buf_to_uint32(&ctl_buf->buf[1]);
cstring = (const char *)&ctl_buf->buf[5];
if(EmptyString(cstring))
return;
client_p = find_cli_connid_hash(fd);
if(client_p != NULL && client_p->localClient != NULL)
{
rb_free(client_p->localClient->cipher_string);
client_p->localClient->cipher_string = rb_strdup(cstring);
}
}
static void
ssl_process_certfp(ssl_ctl_t * ctl, ssl_ctl_buf_t * ctl_buf)
{
struct Client *client_p;
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uint32_t fd;
uint32_t certfp_method;
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uint32_t len;
uint8_t *certfp;
char *certfp_string;
const char *method_string;
int method_len;
if(ctl_buf->buflen > 13 + RB_SSL_CERTFP_LEN)
return; /* bogus message..drop it.. XXX should warn here */
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fd = buf_to_uint32(&ctl_buf->buf[1]);
certfp_method = buf_to_uint32(&ctl_buf->buf[5]);
len = buf_to_uint32(&ctl_buf->buf[9]);
certfp = (uint8_t *)&ctl_buf->buf[13];
client_p = find_cli_connid_hash(fd);
if(client_p == NULL)
return;
switch (certfp_method) {
case RB_SSL_CERTFP_METH_CERT_SHA1:
method_string = CERTFP_PREFIX_CERT_SHA1;
break;
case RB_SSL_CERTFP_METH_CERT_SHA256:
method_string = CERTFP_PREFIX_CERT_SHA256;
break;
case RB_SSL_CERTFP_METH_CERT_SHA512:
method_string = CERTFP_PREFIX_CERT_SHA512;
break;
case RB_SSL_CERTFP_METH_SPKI_SHA256:
method_string = CERTFP_PREFIX_SPKI_SHA256;
break;
case RB_SSL_CERTFP_METH_SPKI_SHA512:
method_string = CERTFP_PREFIX_SPKI_SHA512;
break;
default:
return;
}
method_len = strlen(method_string);
rb_free(client_p->certfp);
certfp_string = rb_malloc(method_len + len * 2 + 1);
rb_strlcpy(certfp_string, method_string, method_len + len * 2 + 1);
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for(uint32_t i = 0; i < len; i++)
snprintf(certfp_string + method_len + 2 * i, 3, "%02x",
certfp[i]);
client_p->certfp = certfp_string;
}
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static void
ssl_process_cmd_recv(ssl_ctl_t * ctl)
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{
static const char *cannot_setup_ssl = "ssld cannot setup ssl, check your certificates and private key";
static const char *no_ssl_or_zlib = "ssld has neither SSL/TLS or zlib support killing all sslds";
rb_dlink_node *ptr, *next;
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ssl_ctl_buf_t *ctl_buf;
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unsigned long len;
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if(ctl->dead)
return;
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RB_DLINK_FOREACH_SAFE(ptr, next, ctl->readq.head)
{
ctl_buf = ptr->data;
switch (*ctl_buf->buf)
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{
case 'N':
ircd_ssl_ok = false; /* ssld says it can't do ssl/tls */
break;
case 'O':
ssl_process_open_fd(ctl, ctl_buf);
break;
case 'D':
ssl_process_dead_fd(ctl, ctl_buf);
break;
case 'C':
ssl_process_cipher_string(ctl, ctl_buf);
break;
case 'F':
ssl_process_certfp(ctl, ctl_buf);
break;
case 'I':
ircd_ssl_ok = false;
ilog(L_MAIN, "%s", cannot_setup_ssl);
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sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s", cannot_setup_ssl);
break;
case 'U':
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ircd_zlib_ok = 0;
ircd_ssl_ok = false;
ilog(L_MAIN, "%s", no_ssl_or_zlib);
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sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s", no_ssl_or_zlib);
ssl_killall();
return;
case 'V':
len = ctl_buf->buflen - 1;
if (len > sizeof(ctl->version) - 1)
len = sizeof(ctl->version) - 1;
strncpy(ctl->version, &ctl_buf->buf[1], len);
case 'z':
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ircd_zlib_ok = 0;
break;
default:
ilog(L_MAIN, "Received invalid command from ssld: %s", ctl_buf->buf);
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sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "Received invalid command from ssld");
break;
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}
rb_dlinkDelete(ptr, &ctl->readq);
rb_free(ctl_buf->buf);
rb_free(ctl_buf);
}
}
static void
ssl_read_ctl(rb_fde_t * F, void *data)
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{
ssl_ctl_buf_t *ctl_buf;
ssl_ctl_t *ctl = data;
int retlen;
if(ctl->dead)
return;
do
{
ctl_buf = rb_malloc(sizeof(ssl_ctl_buf_t));
ctl_buf->buf = rb_malloc(READSIZE);
retlen = rb_recv_fd_buf(ctl->F, ctl_buf->buf, READSIZE, ctl_buf->F, 4);
ctl_buf->buflen = retlen;
if(retlen <= 0)
{
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rb_free(ctl_buf->buf);
rb_free(ctl_buf);
}
else
rb_dlinkAddTail(ctl_buf, &ctl_buf->node, &ctl->readq);
}
while(retlen > 0);
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if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno)))
{
ssl_dead(ctl);
return;
}
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ssl_process_cmd_recv(ctl);
rb_setselect(ctl->F, RB_SELECT_READ, ssl_read_ctl, ctl);
}
static ssl_ctl_t *
which_ssld(void)
{
ssl_ctl_t *ctl, *lowest = NULL;
rb_dlink_node *ptr;
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RB_DLINK_FOREACH(ptr, ssl_daemons.head)
{
ctl = ptr->data;
if(ctl->dead)
continue;
if(ctl->shutdown)
continue;
if(lowest == NULL)
{
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lowest = ctl;
continue;
}
if(ctl->cli_count < lowest->cli_count)
lowest = ctl;
}
return (lowest);
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}
static void
ssl_write_ctl(rb_fde_t * F, void *data)
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{
ssl_ctl_t *ctl = data;
ssl_ctl_buf_t *ctl_buf;
rb_dlink_node *ptr, *next;
int retlen, x;
if(ctl->dead)
return;
RB_DLINK_FOREACH_SAFE(ptr, next, ctl->writeq.head)
{
ctl_buf = ptr->data;
/* in theory unix sock_dgram shouldn't ever short write this.. */
retlen = rb_send_fd_buf(ctl->F, ctl_buf->F, ctl_buf->nfds, ctl_buf->buf, ctl_buf->buflen, ctl->pid);
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if(retlen > 0)
{
rb_dlinkDelete(ptr, &ctl->writeq);
for(x = 0; x < ctl_buf->nfds; x++)
rb_close(ctl_buf->F[x]);
rb_free(ctl_buf->buf);
rb_free(ctl_buf);
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}
if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno)))
{
ssl_dead(ctl);
return;
}
else
{
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rb_setselect(ctl->F, RB_SELECT_WRITE, ssl_write_ctl, ctl);
}
}
}
static void
ssl_cmd_write_queue(ssl_ctl_t * ctl, rb_fde_t ** F, int count, const void *buf, size_t buflen)
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{
ssl_ctl_buf_t *ctl_buf;
int x;
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/* don't bother */
if(ctl->dead)
return;
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ctl_buf = rb_malloc(sizeof(ssl_ctl_buf_t));
ctl_buf->buf = rb_malloc(buflen);
memcpy(ctl_buf->buf, buf, buflen);
ctl_buf->buflen = buflen;
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for(x = 0; x < count && x < MAXPASSFD; x++)
{
ctl_buf->F[x] = F[x];
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}
ctl_buf->nfds = count;
rb_dlinkAddTail(ctl_buf, &ctl_buf->node, &ctl->writeq);
ssl_write_ctl(ctl->F, ctl);
}
static void
send_new_ssl_certs_one(ssl_ctl_t * ctl)
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{
size_t len = 5;
if(ServerInfo.ssl_cert)
len += strlen(ServerInfo.ssl_cert);
else
return;
if(ServerInfo.ssl_private_key)
len += strlen(ServerInfo.ssl_private_key);
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if(ServerInfo.ssl_dh_params)
len += strlen(ServerInfo.ssl_dh_params);
if(ServerInfo.ssl_cipher_list)
len += strlen(ServerInfo.ssl_cipher_list);
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if(len > sizeof(tmpbuf))
{
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sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Parameters for send_new_ssl_certs_one too long (%zu > %zu) to pass to ssld, not sending...",
len, sizeof(tmpbuf));
ilog(L_MAIN,
"Parameters for send_new_ssl_certs_one too long (%zu > %zu) to pass to ssld, not sending...",
len, sizeof(tmpbuf));
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return;
}
int ret = snprintf(tmpbuf, sizeof(tmpbuf), "K%c%s%c%s%c%s%c%s%c", nul,
ServerInfo.ssl_cert, nul,
ServerInfo.ssl_private_key != NULL ? ServerInfo.ssl_private_key : "", nul,
ServerInfo.ssl_dh_params != NULL ? ServerInfo.ssl_dh_params : "", nul,
ServerInfo.ssl_cipher_list != NULL ? ServerInfo.ssl_cipher_list : "", nul);
if(ret > 5)
ssl_cmd_write_queue(ctl, NULL, 0, tmpbuf, (size_t) ret);
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}
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static void
send_certfp_method(ssl_ctl_t *ctl)
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{
char buf[5];
buf[0] = 'F';
uint32_to_buf(&buf[1], ConfigFileEntry.certfp_method);
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ssl_cmd_write_queue(ctl, NULL, 0, buf, sizeof(buf));
}
static void
ssld_update_config_one(ssl_ctl_t *ctl)
{
send_certfp_method(ctl);
send_new_ssl_certs_one(ctl);
}
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void
ssld_update_config(void)
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{
rb_dlink_node *ptr;
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RB_DLINK_FOREACH(ptr, ssl_daemons.head)
{
ssl_ctl_t *ctl = ptr->data;
if (ctl->dead || ctl->shutdown)
continue;
ssld_update_config_one(ctl);
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}
}
ssl_ctl_t *
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start_ssld_accept(rb_fde_t * sslF, rb_fde_t * plainF, uint32_t id)
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{
rb_fde_t *F[2];
ssl_ctl_t *ctl;
char buf[5];
F[0] = sslF;
F[1] = plainF;
buf[0] = 'A';
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uint32_to_buf(&buf[1], id);
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ctl = which_ssld();
if(!ctl)
return NULL;
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ctl->cli_count++;
ssl_cmd_write_queue(ctl, F, 2, buf, sizeof(buf));
return ctl;
}
ssl_ctl_t *
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start_ssld_connect(rb_fde_t * sslF, rb_fde_t * plainF, uint32_t id)
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{
rb_fde_t *F[2];
ssl_ctl_t *ctl;
char buf[5];
F[0] = sslF;
F[1] = plainF;
buf[0] = 'C';
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uint32_to_buf(&buf[1], id);
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ctl = which_ssld();
if(!ctl)
return NULL;
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ctl->cli_count++;
ssl_cmd_write_queue(ctl, F, 2, buf, sizeof(buf));
return ctl;
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}
void
ssld_decrement_clicount(ssl_ctl_t * ctl)
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{
if(ctl == NULL)
return;
ctl->cli_count--;
if(ctl->shutdown && !ctl->cli_count)
{
ctl->dead = 1;
rb_kill(ctl->pid, SIGKILL);
}
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if(ctl->dead && !ctl->cli_count)
{
free_ssl_daemon(ctl);
}
}
static void
cleanup_dead_ssl(void *unused)
{
rb_dlink_node *ptr, *next;
ssl_ctl_t *ctl;
RB_DLINK_FOREACH_SAFE(ptr, next, ssl_daemons.head)
{
ctl = ptr->data;
if(ctl->dead && !ctl->cli_count)
{
free_ssl_daemon(ctl);
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}
}
}
int
get_ssld_count(void)
{
return ssld_count;
}
void
ssld_foreach_info(void (*func)(void *data, pid_t pid, int cli_count, enum ssld_status status, const char *version), void *data)
{
rb_dlink_node *ptr, *next;
ssl_ctl_t *ctl;
RB_DLINK_FOREACH_SAFE(ptr, next, ssl_daemons.head)
{
ctl = ptr->data;
func(data, ctl->pid, ctl->cli_count,
ctl->dead ? SSLD_DEAD :
(ctl->shutdown ? SSLD_SHUTDOWN : SSLD_ACTIVE),
ctl->version);
}
}
void
init_ssld(void)
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{
rb_event_addish("cleanup_dead_ssld", cleanup_dead_ssl, NULL, 60);
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}