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1 | /* | |
2 | * Copyright (c) 2012 William Pitcock <nenolod@dereferenced.org>. | |
3 | * | |
4 | * Permission to use, copy, modify, and/or distribute this software for any | |
5 | * purpose with or without fee is hereby granted, provided that the above | |
6 | * copyright notice and this permission notice is present in all copies. | |
7 | * | |
8 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
9 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
10 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
11 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, | |
12 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
13 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
14 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
15 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
16 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
17 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
18 | * POSSIBILITY OF SUCH DAMAGE. | |
19 | */ | |
20 | ||
21 | #include "stdinc.h" | |
22 | #include "client.h" | |
23 | #include "match.h" | |
24 | #include "hash.h" | |
25 | #include "ircd.h" | |
26 | #include "numeric.h" | |
27 | #include "send.h" | |
28 | #include "msg.h" | |
29 | #include "modules.h" | |
30 | #include "sslproc.h" | |
31 | #include "s_assert.h" | |
32 | #include "s_serv.h" | |
33 | #include "logger.h" | |
34 | ||
35 | static const char starttls_desc[] = "Provides the tls CAP and STARTTLS command"; | |
36 | ||
37 | static void mr_starttls(struct MsgBuf *, struct Client *, struct Client *, int, const char **); | |
38 | ||
39 | struct Message starttls_msgtab = { | |
40 | "STARTTLS", 0, 0, 0, 0, | |
41 | {{mr_starttls, 0}, mg_ignore, mg_ignore, mg_ignore, mg_ignore, mg_ignore} | |
42 | }; | |
43 | ||
44 | mapi_clist_av1 starttls_clist[] = { &starttls_msgtab, NULL }; | |
45 | ||
46 | unsigned int CLICAP_TLS = 0; | |
47 | ||
48 | static struct ClientCapability capdata_tls = { | |
49 | .flags = CLICAP_FLAGS_PRIORITY, | |
50 | }; | |
51 | ||
52 | mapi_cap_list_av2 starttls_cap_list[] = { | |
53 | { MAPI_CAP_CLIENT, "tls", &capdata_tls, &CLICAP_TLS }, | |
54 | { 0, NULL, NULL, NULL } | |
55 | }; | |
56 | ||
57 | DECLARE_MODULE_AV2(starttls, NULL, NULL, starttls_clist, NULL, NULL, starttls_cap_list, NULL, starttls_desc); | |
58 | ||
59 | static void | |
60 | mr_starttls(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[]) | |
61 | { | |
62 | ssl_ctl_t *ctl; | |
63 | rb_fde_t *F[2]; | |
64 | ||
65 | if (!MyConnect(client_p)) | |
66 | return; | |
67 | ||
68 | if (IsSSL(client_p)) | |
69 | { | |
70 | sendto_one_numeric(client_p, ERR_STARTTLS, form_str(ERR_STARTTLS), "Nested TLS handshake not allowed"); | |
71 | return; | |
72 | } | |
73 | ||
74 | if (!ircd_ssl_ok || !get_ssld_count()) | |
75 | { | |
76 | sendto_one_numeric(client_p, ERR_STARTTLS, form_str(ERR_STARTTLS), "TLS is not configured"); | |
77 | return; | |
78 | } | |
79 | ||
80 | if (rb_socketpair(AF_UNIX, SOCK_STREAM, 0, &F[0], &F[1], "STARTTLS ssld session") == -1) | |
81 | { | |
82 | ilog_error("error creating SSL/TLS socketpair for ssld slave"); | |
83 | sendto_one_numeric(client_p, ERR_STARTTLS, form_str(ERR_STARTTLS), "Unable to create SSL/TLS socketpair for ssld offload slave"); | |
84 | return; | |
85 | } | |
86 | ||
87 | s_assert(client_p->localClient != NULL); | |
88 | ||
89 | /* clear out any remaining plaintext lines */ | |
90 | rb_linebuf_donebuf(&client_p->localClient->buf_recvq); | |
91 | ||
92 | sendto_one_numeric(client_p, RPL_STARTTLS, form_str(RPL_STARTTLS)); | |
93 | send_queued(client_p); | |
94 | ||
95 | /* TODO: set localClient->ssl_callback and handle success/failure */ | |
96 | ||
97 | ctl = start_ssld_accept(client_p->localClient->F, F[1], connid_get(client_p)); | |
98 | if (ctl != NULL) | |
99 | { | |
100 | client_p->localClient->F = F[0]; | |
101 | client_p->localClient->ssl_ctl = ctl; | |
102 | SetSSL(client_p); | |
103 | SetSecure(client_p); | |
104 | } | |
105 | } |