1 /*
2  * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
3  *
4  * Permission to use, copy, modify, and 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 appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #ifndef KAMID_H
18 #define KAMID_H
19 
20 #include "compat.h"
21 
22 #include <event.h>
23 #include <limits.h>
24 #include <stdint.h>
25 #include <tls.h>
26 
27 /* TODO: make these customizable */
28 #define KD_CONF_FILE		"/etc/kamid.conf"
29 #define KD_USER			"_kamid"
30 #define KD_SOCKET		"/var/run/kamid.sock"
31 
32 #define IMSG_DATA_SIZE(imsg)	((imsg).hdr.len - IMSG_HEADER_SIZE)
33 
34 #define MIN(a, b) ((a) < (b) ? (a) : (b))
35 
36 struct imsgev {
37 	struct imsgbuf	 ibuf;
38 	void		(*handler)(int, short, void *);
39 	struct event	 ev;
40 	short		 events;
41 };
42 
43 enum imsg_type {
44 	IMSG_NONE,
45 	IMSG_CTL_LOG_VERBOSE,
46 	IMSG_CTL_RELOAD,
47 	IMSG_CONTROLFD,
48 	IMSG_STARTUP,
49 	IMSG_RECONF_CONF,
50 	IMSG_RECONF_PKI,
51 	IMSG_RECONF_PKI_CERT,
52 	IMSG_RECONF_PKI_KEY,
53 	IMSG_RECONF_LISTEN,
54 	IMSG_RECONF_END,
55 	IMSG_AUTH,
56 	IMSG_AUTH_DIR,
57 	IMSG_AUTH_TLS,
58 	IMSG_CONN_GONE,
59 	IMSG_BUF,
60 };
61 
62 struct kd_options_conf {
63 	/* ... */
64 };
65 
66 enum table_type {
67 	T_NONE		= 0,
68 	T_HASH		= 0x01,
69 };
70 
71 struct table {
72 	char			 t_name[LINE_MAX];
73 	enum table_type		 t_type;
74 	char			 t_path[PATH_MAX];
75 	void			*t_handle;
76 	struct table_backend	*t_backend;
77 };
78 
79 struct table_backend {
80 	const char	*name;
81 	int		(*open)(struct table *);
82 	int		(*add)(struct table *, const char *, const char *);
83 	int		(*lookup)(struct table *, const char *, char **);
84 	void		(*close)(struct table *);
85 };
86 
87 /* table_static.c */
88 extern struct table_backend table_static;
89 
90 #define L_NONE	0x0
91 #define L_TLS	0x1
92 struct kd_listen_conf {
93 	SIMPLEQ_ENTRY(kd_listen_conf)	 entry;
94 	uint32_t			 id;
95 	uint32_t			 flags;
96 	int				 fd;
97 	char				 iface[LINE_MAX];
98 	uint16_t			 port;
99 	struct table			*auth_table;
100 	char				 pki[LINE_MAX];
101 	struct event			 ev;
102 	struct tls			*ctx;
103 };
104 
105 struct kd_pki_conf {
106 	SIMPLEQ_ENTRY(kd_pki_conf)	 entry;
107 	char				 name[LINE_MAX];
108 	uint8_t				*cert;
109 	size_t				 certlen;
110 	uint8_t				*key;
111 	size_t				 keylen;
112 	struct tls_config		*tlsconf;
113 };
114 
115 struct kd_tables_conf {
116 	SIMPLEQ_ENTRY(kd_tables_conf)	 entry;
117 	struct table			*table;
118 };
119 
120 struct kd_conf {
121 	struct kd_options_conf					 kd_options;
122 	SIMPLEQ_HEAD(kd_pki_conf_head, kd_pki_conf)		 pki_head;
123 	SIMPLEQ_HEAD(kd_tables_conf_head, kd_tables_conf)	 table_head;
124 	SIMPLEQ_HEAD(kd_listen_conf_head, kd_listen_conf)	 listen_head;
125 };
126 
127 struct kd_auth_req {
128 	uint32_t	listen_id;
129 	char		hash[128+1];
130 };
131 
132 /*
133  * 9p message header.
134  *
135  * The message itself is len bytes long (counting the whole header
136  * too.)
137  */
138 struct np_msg_header {
139 	uint32_t	len;
140 	uint8_t		type;
141 	uint16_t	tag;
142 };
143 
144 /* useful constants */
145 #define NOTAG		((uint16_t)~0U)
146 #define NOFID		((uint32_t)~0U)
147 #define NOUID		(-1)
148 
149 /* 9p message types */
150 enum {
151 	Tversion =	100,
152 	Rversion,
153 	Tauth =		102,
154 	Rauth,
155 	Tattach =	104,
156 	Rattach,
157 	Terror =	106,	/* illegal */
158 	Rerror,
159 	Tflush =	108,
160 	Rflush,
161 	Twalk =		110,
162 	Rwalk,
163 	Topen =		112,
164 	Ropen,
165 	Tcreate =	114,
166 	Rcreate,
167 	Tread =		116,
168 	Rread,
169 	Twrite =	118,
170 	Rwrite,
171 	Tclunk =	120,
172 	Rclunk,
173 	Tremove =	122,
174 	Rremove,
175 	Tstat =		124,
176 	Rstat,
177 	Twstat =	126,
178 	Rwstat,
179 	Tmax,
180 
181 	/*
182 	 * plan9ports' include/fcall.h also has a
183 	 *
184 	 *	Topenfd = 98,
185 	 *	Ropenfd,
186 	 *
187 	 * which it's not mentioned in the 9p "rfc" over at
188 	 * 9p.cat-v.org.  Ignoring that for now.
189 	 */
190 };
191 
192 /* kamid.c */
193 extern int verbose;
194 int	main_imsg_compose_listener(int, int, uint32_t, const void *, uint16_t);
195 void	merge_config(struct kd_conf *, struct kd_conf *);
196 void	imsg_event_add(struct imsgev *);
197 int	imsg_compose_event(struct imsgev *, uint16_t, uint32_t, pid_t,
198 	    int, const void *, uint16_t);
199 
200 struct kd_conf	*config_new_empty(void);
201 void		 config_clear(struct kd_conf *);
202 
203 /* parse.y */
204 struct kd_conf	*parse_config(const char *);
205 int		 cmdline_symset(char *);
206 
207 #endif