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1 | /* authd/providers/rdns.c - rDNS lookup provider for authd | |
2 | * Copyright (c) 2016 Elizabeth Myers <elizabeth@interlinked.me> | |
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 "rb_commio.h" | |
23 | #include "authd.h" | |
24 | #include "provider.h" | |
25 | #include "notice.h" | |
26 | #include "res.h" | |
27 | #include "dns.h" | |
28 | ||
29 | #define SELF_PID (rdns_provider.id) | |
30 | ||
31 | struct user_query | |
32 | { | |
33 | struct dns_query *query; /* Pending DNS query */ | |
34 | }; | |
35 | ||
36 | /* Goinked from old s_auth.c --Elizabeth */ | |
37 | static const char *messages[] = | |
38 | { | |
39 | "*** Looking up your hostname...", | |
40 | "*** Couldn't look up your hostname", | |
41 | "*** Your hostname is too long, ignoring hostname", | |
42 | }; | |
43 | ||
44 | typedef enum | |
45 | { | |
46 | REPORT_LOOKUP, | |
47 | REPORT_FAIL, | |
48 | REPORT_TOOLONG, | |
49 | } dns_message; | |
50 | ||
51 | static void client_fail(struct auth_client *auth, dns_message message); | |
52 | static void client_success(struct auth_client *auth); | |
53 | static void dns_answer_callback(const char *res, bool status, query_type type, void *data); | |
54 | ||
55 | static int rdns_timeout = RDNS_TIMEOUT_DEFAULT; | |
56 | ||
57 | static void | |
58 | dns_answer_callback(const char *res, bool status, query_type type, void *data) | |
59 | { | |
60 | struct auth_client *auth = data; | |
61 | ||
62 | if(res == NULL || status == false) | |
63 | client_fail(auth, REPORT_FAIL); | |
64 | else if(strlen(res) > HOSTLEN) | |
65 | client_fail(auth, REPORT_TOOLONG); | |
66 | else | |
67 | { | |
68 | rb_strlcpy(auth->hostname, res, HOSTLEN + 1); | |
69 | client_success(auth); | |
70 | } | |
71 | } | |
72 | ||
73 | static void | |
74 | client_fail(struct auth_client *auth, dns_message report) | |
75 | { | |
76 | struct user_query *query = get_provider_data(auth, SELF_PID); | |
77 | ||
78 | lrb_assert(query != NULL); | |
79 | ||
80 | rb_strlcpy(auth->hostname, "*", sizeof(auth->hostname)); | |
81 | ||
82 | notice_client(auth->cid, messages[report]); | |
83 | cancel_query(query->query); | |
84 | ||
85 | rb_free(query); | |
86 | ||
87 | set_provider_data(auth, SELF_PID, NULL); | |
88 | set_provider_timeout_absolute(auth, SELF_PID, 0); | |
89 | provider_done(auth, SELF_PID); | |
90 | ||
91 | auth_client_unref(auth); | |
92 | } | |
93 | ||
94 | static void | |
95 | client_success(struct auth_client *auth) | |
96 | { | |
97 | struct user_query *query = get_provider_data(auth, SELF_PID); | |
98 | ||
99 | lrb_assert(query != NULL); | |
100 | ||
101 | notice_client(auth->cid, "*** Found your hostname: %s", auth->hostname); | |
102 | cancel_query(query->query); | |
103 | ||
104 | rb_free(query); | |
105 | ||
106 | set_provider_data(auth, SELF_PID, NULL); | |
107 | set_provider_timeout_absolute(auth, SELF_PID, 0); | |
108 | provider_done(auth, SELF_PID); | |
109 | ||
110 | auth_client_unref(auth); | |
111 | } | |
112 | ||
113 | static void | |
114 | rdns_destroy(void) | |
115 | { | |
116 | struct auth_client *auth; | |
117 | rb_dictionary_iter iter; | |
118 | ||
119 | RB_DICTIONARY_FOREACH(auth, &iter, auth_clients) | |
120 | { | |
121 | if(get_provider_data(auth, SELF_PID) != NULL) | |
122 | client_fail(auth, REPORT_FAIL); | |
123 | /* auth is now invalid as we have no reference */ | |
124 | } | |
125 | } | |
126 | ||
127 | static bool | |
128 | rdns_start(struct auth_client *auth) | |
129 | { | |
130 | struct user_query *query = rb_malloc(sizeof(struct user_query)); | |
131 | ||
132 | auth_client_ref(auth); | |
133 | ||
134 | set_provider_data(auth, SELF_PID, query); | |
135 | set_provider_timeout_relative(auth, SELF_PID, rdns_timeout); | |
136 | ||
137 | query->query = lookup_hostname(auth->c_ip, dns_answer_callback, auth); | |
138 | ||
139 | notice_client(auth->cid, messages[REPORT_LOOKUP]); | |
140 | return true; | |
141 | } | |
142 | ||
143 | static void | |
144 | rdns_cancel(struct auth_client *auth) | |
145 | { | |
146 | struct user_query *query = get_provider_data(auth, SELF_PID); | |
147 | ||
148 | if(query != NULL) | |
149 | client_fail(auth, REPORT_FAIL); | |
150 | } | |
151 | ||
152 | static void | |
153 | add_conf_dns_timeout(const char *key, int parc, const char **parv) | |
154 | { | |
155 | int timeout = atoi(parv[0]); | |
156 | ||
157 | if(timeout < 0) | |
158 | { | |
159 | warn_opers(L_CRIT, "rDNS: DNS timeout < 0 (value: %d)", timeout); | |
160 | exit(EX_PROVIDER_ERROR); | |
161 | } | |
162 | ||
163 | rdns_timeout = timeout; | |
164 | } | |
165 | ||
166 | struct auth_opts_handler rdns_options[] = | |
167 | { | |
168 | { "rdns_timeout", 1, add_conf_dns_timeout }, | |
169 | { NULL, 0, NULL }, | |
170 | }; | |
171 | ||
172 | struct auth_provider rdns_provider = | |
173 | { | |
174 | .name = "rdns", | |
175 | .letter = 'R', | |
176 | .destroy = rdns_destroy, | |
177 | .start = rdns_start, | |
178 | .cancel = rdns_cancel, | |
179 | .timeout = rdns_cancel, | |
180 | .opt_handlers = rdns_options, | |
181 | }; |