1 /* authd/provider.c - authentication provider framework
2 * Copyright (c) 2016 Elizabeth Myers <elizabeth@interlinked.me>
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.
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.
21 /* So the basic design here is to have "authentication providers" that do
22 * things like query ident and blacklists and even open proxies.
24 * Providers are registered statically in the struct auth_providers array. You will
25 * probably want to add an item to the provider_t enum also.
27 * Providers can either return failure immediately, immediate acceptance, or
28 * do work in the background (calling set_provider to signal this).
30 * It is up to providers to keep their own state on clients if they need to.
32 * All providers must implement at a minimum a perform_provider function. You
33 * don't have to implement the others if you don't need them.
35 * Providers may kick clients off by rejecting them. Upon rejection, all
36 * providers are cancelled. They can also unconditionally accept them.
38 * When a provider is done and is neutral on accepting/rejecting a client, it
39 * should call provider_done. Do NOT call this if you have accepted or rejected
42 * --Elizafox, 9 March 2016
48 rb_dlink_list auth_providers
;
51 struct auth_client auth_clients
[MAX_CLIENTS
];
54 void load_provider(struct auth_provider
*provider
)
57 rb_dlinkAdd(provider
, &provider
->node
, &auth_providers
);
60 void unload_provider(struct auth_provider
*provider
)
63 rb_dlinkDelete(&provider
->node
, &auth_providers
);
66 /* Initalise all providers */
67 void init_providers(void)
70 struct auth_provider
*provider
;
72 RB_DLINK_FOREACH(ptr
, auth_providers
.head
)
76 if(provider
->init
&& !provider
->init())
77 /* Provider failed to init, time to go */
82 /* Terminate all providers */
83 void destroy_providers(void)
86 struct auth_provider
*provider
;
88 /* Cancel outstanding connections */
89 for (size_t i
= 0; i
< MAX_CLIENTS
; i
++)
91 if(auth_clients
[i
].cid
)
93 /* TBD - is this the right thing?
94 * (NOTE - this error message is designed for morons) */
95 reject_client(&auth_clients
[i
], 0,
96 "IRC server reloading... try reconnecting in a few seconds");
100 RB_DLINK_FOREACH(ptr
, auth_providers
.head
)
102 provider
= ptr
->data
;
104 if(provider
->destroy
)
109 /* Cancel outstanding providers for a client */
110 void cancel_providers(struct auth_client
*auth
)
113 struct auth_provider
*provider
;
115 RB_DLINK_FOREACH(ptr
, auth_providers
.head
)
117 provider
= ptr
->data
;
119 if(provider
->cancel
&& is_provider(auth
, provider
->id
))
120 /* Cancel if required */
121 provider
->cancel(auth
);
125 /* Provider is done */
126 void provider_done(struct auth_client
*auth
, provider_t id
)
129 struct auth_provider
*provider
;
131 unset_provider(auth
, id
);
135 /* No more providers, done */
136 accept_client(auth
, 0);
140 RB_DLINK_FOREACH(ptr
, auth_providers
.head
)
142 provider
= ptr
->data
;
144 if(provider
->completed
&& is_provider(auth
, provider
->id
))
145 /* Notify pending clients who asked for it */
146 provider
->completed(auth
, id
);
150 /* Reject a client, cancel outstanding providers if any */
151 void reject_client(struct auth_client
*auth
, provider_t id
, const char *reason
)
153 uint16_t cid
= auth
->cid
;
155 rb_helper_write(authd_helper
, "R %x :%s", auth
->cid
, reason
);
157 unset_provider(auth
, id
);
160 cancel_providers(auth
);
162 memset(&auth_clients
[cid
], 0, sizeof(struct auth_client
));
165 /* Accept a client, cancel outstanding providers if any */
166 void accept_client(struct auth_client
*auth
, provider_t id
)
168 uint16_t cid
= auth
->cid
;
170 rb_helper_write(authd_helper
, "A %x %s %s", auth
->cid
, auth
->username
, auth
->hostname
);
172 unset_provider(auth
, id
);
175 cancel_providers(auth
);
177 memset(&auth_clients
[cid
], 0, sizeof(struct auth_client
));
180 /* Send a notice to a client */
181 void notice_client(struct auth_client
*auth
, const char *notice
)
183 rb_helper_write(authd_helper
, "N %x :%s", auth
->cid
, notice
);
186 /* Begin authenticating user */
187 static void start_auth(const char *cid
, const char *l_ip
, const char *l_port
, const char *c_ip
, const char *c_port
)
190 struct auth_provider
*provider
;
191 struct auth_client
*auth
;
192 long lcid
= strtol(cid
, NULL
, 16);
194 if(lcid
>= MAX_CLIENTS
)
197 auth
= &auth_clients
[lcid
];
199 /* Shouldn't get here */
202 auth
->cid
= (uint16_t)lcid
;
204 (void)rb_inet_pton_sock(l_ip
, (struct sockaddr
*)&auth
->l_ip
);
205 auth
->l_port
= (uint16_t)atoi(l_port
); /* Safe cast, port shouldn't exceed 16 bits */
207 (void)rb_inet_pton_sock(c_ip
, (struct sockaddr
*)&auth
->c_ip
);
208 auth
->c_port
= (uint16_t)atoi(c_port
);
210 RB_DLINK_FOREACH(ptr
, auth_providers
.head
)
212 provider
= ptr
->data
;
214 /* Execute providers */
215 if(!provider
->start(auth
))
217 /* Rejected immediately */
218 cancel_providers(auth
);
223 /* If no providers are running, accept the client */
225 accept_client(auth
, 0);
228 /* Callback for the initiation */
229 void handle_new_connection(int parc
, char *parv
[])
234 start_auth(parv
[1], parv
[2], parv
[3], parv
[4], parv
[5]);