[solanum.git] / authd / providers / ident.c

/* authd/providers/ident.c - ident lookup provider for authd
 * Copyright (c) 2016 Elizabeth Myers <elizabeth@interlinked.me>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice is present in all copies.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "stdinc.h"
#include "match.h"
#include "authd.h"
#include "notice.h"
#include "provider.h"
#include "res.h"

#define IDENT_BUFSIZE 128

struct ident_query
{
	time_t timeout;				/* Timeout interval */
	rb_fde_t *F;				/* Our FD */
};

/* Goinked from old s_auth.c --Elizafox */
static const char *messages[] =
{
	":*** Checking Ident",
	":*** Got Ident response",
	":*** No Ident response",
};

typedef enum
{
	REPORT_LOOKUP,
	REPORT_FOUND,
	REPORT_FAIL,
} ident_message;

static EVH timeout_ident_queries_event;
static CNCB ident_connected;
static PF read_ident_reply;

static void client_fail(struct auth_client *auth, ident_message message);
static void client_success(struct auth_client *auth);
static char * get_valid_ident(char *buf);

static struct ev_entry *timeout_ev;
static int ident_timeout = 5;


bool ident_init(void)
{
	timeout_ev = rb_event_addish("timeout_ident_queries_event", timeout_ident_queries_event, NULL, 1);
	return (timeout_ev != NULL);
}

void ident_destroy(void)
{
	struct auth_client *auth;
	rb_dictionary_iter iter;

	/* Nuke all ident queries */
	RB_DICTIONARY_FOREACH(auth, &iter, auth_clients)
	{
		if(auth->data[PROVIDER_IDENT] != NULL)
			client_fail(auth, REPORT_FAIL);
	}
}

bool ident_start(struct auth_client *auth)
{
	struct ident_query *query = rb_malloc(sizeof(struct ident_query));
	struct rb_sockaddr_storage l_addr, c_addr;
	int family;
	rb_fde_t *F;

	auth->data[PROVIDER_IDENT] = query;
	query->timeout = rb_current_time() + ident_timeout;

	if((F = rb_socket(family, SOCK_STREAM, 0, "ident")) == NULL)
	{
		client_fail(auth, REPORT_FAIL);
		return true;	/* Not a fatal error */
	}

	query->F = F;

	/* Build sockaddr_storages for rb_connect_tcp below */
	memcpy(&l_addr, &auth->l_addr, sizeof(l_addr));
	memcpy(&c_addr, &auth->c_addr, sizeof(c_addr));

	/* Set the ports correctly */
#ifdef RB_IPV6
	if(GET_SS_FAMILY(&l_addr) == AF_INET6)
		((struct sockaddr_in6 *)&l_addr)->sin6_port = 0;
	else
#endif
		((struct sockaddr_in *)&l_addr)->sin_port = 0;

#ifdef RB_IPV6
	if(GET_SS_FAMILY(&c_addr) == AF_INET6)
		((struct sockaddr_in6 *)&c_addr)->sin6_port = htons(113);
	else
#endif
		((struct sockaddr_in *)&c_addr)->sin_port = htons(113);

	rb_connect_tcp(F, (struct sockaddr *)&c_addr,
			(struct sockaddr *)&l_addr,
			GET_SS_LEN(&l_addr), ident_connected,
			query, ident_timeout);

	notice_client(auth->cid, messages[REPORT_LOOKUP]);
	set_provider_on(auth, PROVIDER_IDENT);

	return true;
}

void ident_cancel(struct auth_client *auth)
{
	struct ident_query *query = auth->data[PROVIDER_IDENT];

	if(query != NULL)
		client_fail(auth, REPORT_FAIL);
}

/* Timeout outstanding queries */
static void timeout_ident_queries_event(void *notused)
{
	struct auth_client *auth;
	rb_dictionary_iter iter;

	RB_DICTIONARY_FOREACH(auth, &iter, auth_clients)
	{
		struct ident_query *query = auth->data[PROVIDER_IDENT];

		if(query != NULL && query->timeout < rb_current_time())
			client_fail(auth, REPORT_FAIL);
	}
}

/*
 * ident_connected() - deal with the result of rb_connect_tcp()
 *
 * If the connection failed, we simply close the auth fd and report
 * a failure. If the connection suceeded send the ident server a query
 * giving "theirport , ourport". The write is only attempted *once* so
 * it is deemed to be a fail if the entire write doesn't write all the
 * data given.  This shouldnt be a problem since the socket should have
 * a write buffer far greater than this message to store it in should
 * problems arise. -avalon
 */
static void ident_connected(rb_fde_t *F, int error, void *data)
{
	struct auth_client *auth = data;
	struct ident_query *query = auth->data[PROVIDER_IDENT];
	char authbuf[32];
	int authlen;

	/* Check the error */
	if(error != RB_OK)
	{
		/* We had an error during connection :( */
		client_fail(auth, REPORT_FAIL);
		return;
	}

	snprintf(authbuf, sizeof(authbuf), "%u , %u\r\n",
			auth->c_port, auth->l_port);
	authlen = strlen(authbuf);

	if(rb_write(query->F, authbuf, authlen) != authlen)
	{
		client_fail(auth, REPORT_FAIL);
		return;
	}

	read_ident_reply(query->F, auth);
}

static void
read_ident_reply(rb_fde_t *F, void *data)
{
	struct auth_client *auth = data;
	struct ident_query *query = auth->data[PROVIDER_IDENT];
	char *s = NULL;
	char *t = NULL;
	int len;
	int count;
	char buf[IDENT_BUFSIZE + 1];	/* buffer to read auth reply into */

	len = rb_read(F, buf, IDENT_BUFSIZE);
	if(len < 0 && rb_ignore_errno(errno))
	{
		rb_setselect(F, RB_SELECT_READ, read_ident_reply, query);
		return;
	}

	if(len > 0)
	{
		buf[len] = '\0';

		if((s = get_valid_ident(buf)))
		{
			t = auth->username;

			while (*s == '~' || *s == '^')
				s++;

			for (count = USERLEN; *s && count; s++)
			{
				if(*s == '@')
				{
					break;
				}
				if(*s != ' ' && *s != ':' && *s != '[')
				{
					*t++ = *s;
					count--;
				}
			}
			*t = '\0';
		}
	}

	if(s == NULL)
		client_fail(auth, REPORT_FAIL);
	else
		client_success(auth);
}

static void client_fail(struct auth_client *auth, ident_message report)
{
	struct ident_query *query = auth->data[PROVIDER_IDENT];

	rb_strlcpy(auth->username, "*", sizeof(auth->username));

	rb_close(query->F);
	rb_free(query);
	auth->data[PROVIDER_IDENT] = NULL;

	notice_client(auth->cid, messages[report]);
	provider_done(auth, PROVIDER_IDENT);
}

static void client_success(struct auth_client *auth)
{
	struct ident_query *query = auth->data[PROVIDER_IDENT];

	rb_close(query->F);
	rb_free(query);
	auth->data[PROVIDER_IDENT] = NULL;

	notice_client(auth->cid, messages[REPORT_FOUND]);
	provider_done(auth, PROVIDER_IDENT);
}

/* get_valid_ident
 * parse ident query reply from identd server
 *
 * Torn out of old s_auth.c because there was nothing wrong with it
 * --Elizafox
 *
 * Inputs	- pointer to ident buf
 * Outputs	- NULL if no valid ident found, otherwise pointer to name
 * Side effects - None
 */
static char *
get_valid_ident(char *buf)
{
	int remp = 0;
	int locp = 0;
	char *colon1Ptr;
	char *colon2Ptr;
	char *colon3Ptr;
	char *commaPtr;
	char *remotePortString;

	/* All this to get rid of a sscanf() fun. */
	remotePortString = buf;

	colon1Ptr = strchr(remotePortString, ':');
	if(!colon1Ptr)
		return 0;

	*colon1Ptr = '\0';
	colon1Ptr++;
	colon2Ptr = strchr(colon1Ptr, ':');
	if(!colon2Ptr)
		return 0;

	*colon2Ptr = '\0';
	colon2Ptr++;
	commaPtr = strchr(remotePortString, ',');

	if(!commaPtr)
		return 0;

	*commaPtr = '\0';
	commaPtr++;

	remp = atoi(remotePortString);
	if(!remp)
		return 0;

	locp = atoi(commaPtr);
	if(!locp)
		return 0;

	/* look for USERID bordered by first pair of colons */
	if(!strstr(colon1Ptr, "USERID"))
		return 0;

	colon3Ptr = strchr(colon2Ptr, ':');
	if(!colon3Ptr)
		return 0;

	*colon3Ptr = '\0';
	colon3Ptr++;
	return (colon3Ptr);
}


struct auth_provider ident_provider =
{
	.id = PROVIDER_IDENT,
	.init = ident_init,
	.destroy = ident_destroy,
	.start = ident_start,
	.cancel = ident_cancel,
	.completed = NULL,
};
Commit	Line	Data
2b0cc3d3 EM	1	/* authd/providers/ident.c - ident 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 "match.h"
	23	#include "authd.h"
db821ee9	24	#include "notice.h"
2b0cc3d3 EM	25	#include "provider.h"
	26	#include "res.h"
	27
	28	#define IDENT_BUFSIZE 128
	29
	30	struct ident_query
	31	{
2b0cc3d3 EM	32	time_t timeout; /* Timeout interval */
	33	rb_fde_t F; / Our FD */
	34	};
	35
	36	/* Goinked from old s_auth.c --Elizafox */
	37	static const char *messages[] =
	38	{
	39	":*** Checking Ident",
	40	":*** Got Ident response",
	41	":*** No Ident response",
	42	};
	43
	44	typedef enum
	45	{
	46	REPORT_LOOKUP,
	47	REPORT_FOUND,
	48	REPORT_FAIL,
	49	} ident_message;
	50
	51	static EVH timeout_ident_queries_event;
	52	static CNCB ident_connected;
	53	static PF read_ident_reply;
	54
3e875f62 EM	55	static void client_fail(struct auth_client *auth, ident_message message);
3e875f62 EM	56	static void client_success(struct auth_client *auth);
2b0cc3d3 EM	57	static char * get_valid_ident(char *buf);
2b0cc3d3 EM	58
2b0cc3d3 EM	59	static struct ev_entry *timeout_ev;
	60	static int ident_timeout = 5;
	61
	62
	63	bool ident_init(void)
	64	{
	65	timeout_ev = rb_event_addish("timeout_ident_queries_event", timeout_ident_queries_event, NULL, 1);
	66	return (timeout_ev != NULL);
	67	}
	68
	69	void ident_destroy(void)
	70	{
3e875f62	71	struct auth_client *auth;
aba29d5a	72	rb_dictionary_iter iter;
2b0cc3d3 EM	73
2b0cc3d3 EM	74	/* Nuke all ident queries */
ab33d608	75	RB_DICTIONARY_FOREACH(auth, &iter, auth_clients)
2b0cc3d3	76	{
3e875f62 EM	77	if(auth->data[PROVIDER_IDENT] != NULL)
3e875f62 EM	78	client_fail(auth, REPORT_FAIL);
2b0cc3d3 EM	79	}
	80	}
	81
	82	bool ident_start(struct auth_client *auth)
	83	{
	84	struct ident_query *query = rb_malloc(sizeof(struct ident_query));
	85	struct rb_sockaddr_storage l_addr, c_addr;
	86	int family;
	87	rb_fde_t *F;
	88
3e875f62	89	auth->data[PROVIDER_IDENT] = query;
2b0cc3d3 EM	90	query->timeout = rb_current_time() + ident_timeout;
	91
	92	if((F = rb_socket(family, SOCK_STREAM, 0, "ident")) == NULL)
	93	{
3e875f62	94	client_fail(auth, REPORT_FAIL);
2b0cc3d3 EM	95	return true; /* Not a fatal error */
	96	}
	97
	98	query->F = F;
	99
	100	/* Build sockaddr_storages for rb_connect_tcp below */
32f8c78b EM	101	memcpy(&l_addr, &auth->l_addr, sizeof(l_addr));
32f8c78b EM	102	memcpy(&c_addr, &auth->c_addr, sizeof(c_addr));
2b0cc3d3 EM	103
	104	/* Set the ports correctly */
	105	#ifdef RB_IPV6
	106	if(GET_SS_FAMILY(&l_addr) == AF_INET6)
	107	((struct sockaddr_in6 *)&l_addr)->sin6_port = 0;
	108	else
	109	#endif
	110	((struct sockaddr_in *)&l_addr)->sin_port = 0;
	111
	112	#ifdef RB_IPV6
	113	if(GET_SS_FAMILY(&c_addr) == AF_INET6)
	114	((struct sockaddr_in6 *)&c_addr)->sin6_port = htons(113);
	115	else
	116	#endif
	117	((struct sockaddr_in *)&c_addr)->sin_port = htons(113);
	118
	119	rb_connect_tcp(F, (struct sockaddr *)&c_addr,
	120	(struct sockaddr *)&l_addr,
	121	GET_SS_LEN(&l_addr), ident_connected,
	122	query, ident_timeout);
	123
db821ee9	124	notice_client(auth->cid, messages[REPORT_LOOKUP]);
a7d5aea1	125	set_provider_on(auth, PROVIDER_IDENT);
2b0cc3d3 EM	126
	127	return true;
	128	}
	129
	130	void ident_cancel(struct auth_client *auth)
	131	{
3e875f62	132	struct ident_query *query = auth->data[PROVIDER_IDENT];
2b0cc3d3	133
3e875f62 EM	134	if(query != NULL)
3e875f62 EM	135	client_fail(auth, REPORT_FAIL);
2b0cc3d3 EM	136	}
	137
	138	/* Timeout outstanding queries */
	139	static void timeout_ident_queries_event(void *notused)
	140	{
3e875f62	141	struct auth_client *auth;
aba29d5a	142	rb_dictionary_iter iter;
2b0cc3d3	143
ab33d608	144	RB_DICTIONARY_FOREACH(auth, &iter, auth_clients)
2b0cc3d3	145	{
3e875f62	146	struct ident_query *query = auth->data[PROVIDER_IDENT];
2b0cc3d3	147
3e875f62 EM	148	if(query != NULL && query->timeout < rb_current_time())
3e875f62 EM	149	client_fail(auth, REPORT_FAIL);
2b0cc3d3 EM	150	}
	151	}
	152
	153	/*
	154	* ident_connected() - deal with the result of rb_connect_tcp()
	155	*
	156	* If the connection failed, we simply close the auth fd and report
	157	* a failure. If the connection suceeded send the ident server a query
	158	* giving "theirport , ourport". The write is only attempted once so
	159	* it is deemed to be a fail if the entire write doesn't write all the
	160	* data given. This shouldnt be a problem since the socket should have
	161	* a write buffer far greater than this message to store it in should
	162	* problems arise. -avalon
	163	*/
	164	static void ident_connected(rb_fde_t F, int error, void data)
	165	{
3e875f62 EM	166	struct auth_client *auth = data;
3e875f62 EM	167	struct ident_query *query = auth->data[PROVIDER_IDENT];
2b0cc3d3 EM	168	char authbuf[32];
	169	int authlen;
	170
	171	/* Check the error */
	172	if(error != RB_OK)
	173	{
	174	/* We had an error during connection :( */
3e875f62	175	client_fail(auth, REPORT_FAIL);
2b0cc3d3 EM	176	return;
	177	}
	178
	179	snprintf(authbuf, sizeof(authbuf), "%u , %u\r\n",
	180	auth->c_port, auth->l_port);
	181	authlen = strlen(authbuf);
	182
	183	if(rb_write(query->F, authbuf, authlen) != authlen)
	184	{
3e875f62	185	client_fail(auth, REPORT_FAIL);
2b0cc3d3 EM	186	return;
	187	}
	188
3e875f62	189	read_ident_reply(query->F, auth);
2b0cc3d3 EM	190	}
	191
	192	static void
	193	read_ident_reply(rb_fde_t F, void data)
	194	{
3e875f62 EM	195	struct auth_client *auth = data;
3e875f62 EM	196	struct ident_query *query = auth->data[PROVIDER_IDENT];
2b0cc3d3 EM	197	char *s = NULL;
	198	char *t = NULL;
	199	int len;
	200	int count;
	201	char buf[IDENT_BUFSIZE + 1]; /* buffer to read auth reply into */
	202
	203	len = rb_read(F, buf, IDENT_BUFSIZE);
	204	if(len < 0 && rb_ignore_errno(errno))
	205	{
	206	rb_setselect(F, RB_SELECT_READ, read_ident_reply, query);
	207	return;
	208	}
	209
	210	if(len > 0)
	211	{
	212	buf[len] = '\0';
	213
	214	if((s = get_valid_ident(buf)))
	215	{
	216	t = auth->username;
	217
	218	while (s == '~' \|\| s == '^')
	219	s++;
	220
	221	for (count = USERLEN; *s && count; s++)
	222	{
	223	if(*s == '@')
	224	{
	225	break;
	226	}
	227	if(s != ' ' && s != ':' && *s != '[')
	228	{
	229	t++ = s;
	230	count--;
	231	}
	232	}
	233	*t = '\0';
	234	}
	235	}
	236
	237	if(s == NULL)
3e875f62	238	client_fail(auth, REPORT_FAIL);
2b0cc3d3	239	else
3e875f62	240	client_success(auth);
2b0cc3d3 EM	241	}
2b0cc3d3 EM	242
3e875f62	243	static void client_fail(struct auth_client *auth, ident_message report)
2b0cc3d3	244	{
3e875f62	245	struct ident_query *query = auth->data[PROVIDER_IDENT];
2b0cc3d3	246
3e875f62	247	rb_strlcpy(auth->username, "*", sizeof(auth->username));
2b0cc3d3	248
3e875f62 EM	249	rb_close(query->F);
	250	rb_free(query);
	251	auth->data[PROVIDER_IDENT] = NULL;
2b0cc3d3	252
db821ee9	253	notice_client(auth->cid, messages[report]);
3e875f62	254	provider_done(auth, PROVIDER_IDENT);
2b0cc3d3 EM	255	}
2b0cc3d3 EM	256
3e875f62	257	static void client_success(struct auth_client *auth)
2b0cc3d3	258	{
3e875f62	259	struct ident_query *query = auth->data[PROVIDER_IDENT];
2b0cc3d3	260
3e875f62 EM	261	rb_close(query->F);
	262	rb_free(query);
	263	auth->data[PROVIDER_IDENT] = NULL;
2b0cc3d3	264
db821ee9	265	notice_client(auth->cid, messages[REPORT_FOUND]);
3e875f62	266	provider_done(auth, PROVIDER_IDENT);
2b0cc3d3 EM	267	}
	268
	269	/* get_valid_ident
	270	* parse ident query reply from identd server
	271	*
	272	* Torn out of old s_auth.c because there was nothing wrong with it
	273	* --Elizafox
	274	*
	275	* Inputs - pointer to ident buf
	276	* Outputs - NULL if no valid ident found, otherwise pointer to name
	277	* Side effects - None
	278	*/
	279	static char *
	280	get_valid_ident(char *buf)
	281	{
	282	int remp = 0;
	283	int locp = 0;
	284	char *colon1Ptr;
	285	char *colon2Ptr;
	286	char *colon3Ptr;
	287	char *commaPtr;
	288	char *remotePortString;
	289
	290	/* All this to get rid of a sscanf() fun. */
	291	remotePortString = buf;
	292
	293	colon1Ptr = strchr(remotePortString, ':');
	294	if(!colon1Ptr)
	295	return 0;
	296
	297	*colon1Ptr = '\0';
	298	colon1Ptr++;
	299	colon2Ptr = strchr(colon1Ptr, ':');
	300	if(!colon2Ptr)
	301	return 0;
	302
	303	*colon2Ptr = '\0';
	304	colon2Ptr++;
	305	commaPtr = strchr(remotePortString, ',');
	306
	307	if(!commaPtr)
	308	return 0;
	309
	310	*commaPtr = '\0';
	311	commaPtr++;
	312
	313	remp = atoi(remotePortString);
	314	if(!remp)
	315	return 0;
	316
	317	locp = atoi(commaPtr);
	318	if(!locp)
	319	return 0;
	320
	321	/* look for USERID bordered by first pair of colons */
	322	if(!strstr(colon1Ptr, "USERID"))
	323	return 0;
	324
	325	colon3Ptr = strchr(colon2Ptr, ':');
	326	if(!colon3Ptr)
	327	return 0;
	328
	329	*colon3Ptr = '\0';
	330	colon3Ptr++;
331	return (colon3Ptr);
332	}
333
334
335	struct auth_provider ident_provider =
336	{
337	.id = PROVIDER_IDENT,
338	.init = ident_init,
339	.destroy = ident_destroy,
340	.start = ident_start,
341	.cancel = ident_cancel,
342	.completed = NULL,
343	};