1 /*
2  * Copyright (c) 2010-2015 Reyk Floeter <reyk@openbsd.org>
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 enum {
18 	IMSG_NONE,
19 	IMSG_CTL_OK,
20 	IMSG_CTL_FAIL,
21 	IMSG_CTL_VERBOSE,
22 	IMSG_CTL_NOTIFY,
23 	IMSG_CTL_RESET,
24 	IMSG_CTL_PROCFD,
25 	IMSG_PROC_MAX
26 };
27 
28 /* imsg */
29 struct imsgev {
30 	struct imsgbuf		 ibuf;
31 	void			(*handler)(int, short, void *);
32 	struct event		 ev;
33 	struct privsep_proc	*proc;
34 	void			*data;
35 	short			 events;
36 };
37 
38 #define IMSG_SIZE_CHECK(imsg, p) do {					\
39 	if (IMSG_DATA_SIZE(imsg) < sizeof(*p))				\
40 		fatalx("bad length imsg received (%s)",	#p);		\
41 } while (0)
42 #define IMSG_DATA_SIZE(imsg)	((imsg)->hdr.len - IMSG_HEADER_SIZE)
43 
44 struct ctl_conn {
45 	TAILQ_ENTRY(ctl_conn)	 entry;
46 	uint8_t			 flags;
47 	unsigned int		 waiting;
48 #define CTL_CONN_NOTIFY		 0x01
49 	struct imsgev		 iev;
50 	uid_t			 uid;
51 };
52 TAILQ_HEAD(ctl_connlist, ctl_conn);
53 extern  struct ctl_connlist ctl_conns;
54 
55 /* privsep */
56 enum privsep_procid {
57 	PROC_GOTWEBD	= 0,
58 	PROC_SOCKS,
59 	PROC_MAX,
60 };
61 extern enum privsep_procid privsep_process;
62 
63 #define CONFIG_RELOAD		0x00
64 #define CONFIG_SOCKS		0x01
65 #define CONFIG_ALL		0xff
66 
67 struct privsep_pipes {
68 	int				*pp_pipes[PROC_MAX];
69 };
70 
71 struct privsep {
72 	struct privsep_pipes		*ps_pipes[PROC_MAX];
73 	struct privsep_pipes		*ps_pp;
74 
75 	struct imsgev			*ps_ievs[PROC_MAX];
76 	const char			*ps_title[PROC_MAX];
77 	uint8_t				 ps_what[PROC_MAX];
78 
79 	struct passwd			*ps_pw;
80 	int				 ps_noaction;
81 
82 	unsigned int			 ps_instances[PROC_MAX];
83 	unsigned int			 ps_instance;
84 
85 	/* Event and signal handlers */
86 	struct event			 ps_evsigint;
87 	struct event			 ps_evsigterm;
88 	struct event			 ps_evsigchld;
89 	struct event			 ps_evsighup;
90 	struct event			 ps_evsigpipe;
91 	struct event			 ps_evsigusr1;
92 
93 	void				*ps_env;
94 };
95 
96 struct privsep_proc {
97 	const char		*p_title;
98 	enum privsep_procid	 p_id;
99 	int			(*p_cb)(int, struct privsep_proc *,
100 				    struct imsg *);
101 	void			(*p_init)(struct privsep *,
102 				    struct privsep_proc *);
103 	void			(*p_shutdown)(void);
104 	const char		*p_chroot;
105 	struct passwd		*p_pw;
106 	struct privsep		*p_ps;
107 };
108 
109 struct privsep_fd {
110 	enum privsep_procid		 pf_procid;
111 	unsigned int			 pf_instance;
112 };
113 
114 #if DEBUG
115 #define DPRINTF		log_debug
116 #else
117 #define DPRINTF(x...)	do {} while(0)
118 #endif
119 
120 #define PROC_GOTWEBD_SOCK_FILENO 3
121 #define PROC_MAX_INSTANCES      32
122 
123 /* proc.c */
124 void	 proc_init(struct privsep *, struct privsep_proc *, unsigned int,
125 	    int, char **, enum privsep_procid);
126 void	 proc_kill(struct privsep *);
127 void	 proc_connect(struct privsep *ps);
128 void	 proc_dispatch(int, short event, void *);
129 void	 proc_range(struct privsep *, enum privsep_procid, int *, int *);
130 void	 proc_run(struct privsep *, struct privsep_proc *,
131 	    struct privsep_proc *, unsigned int,
132 	    void (*)(struct privsep *, struct privsep_proc *, void *), void *);
133 void	 imsg_event_add(struct imsgev *);
134 int	 imsg_compose_event(struct imsgev *, uint16_t, uint32_t,
135 	    pid_t, int, void *, uint16_t);
136 int	 imsg_composev_event(struct imsgev *, uint16_t, uint32_t,
137 	    pid_t, int, const struct iovec *, int);
138 int	 proc_compose_imsg(struct privsep *, enum privsep_procid, int,
139 	    uint16_t, uint32_t, int, void *, uint16_t);
140 int	 proc_compose(struct privsep *, enum privsep_procid,
141 	    uint16_t, void *data, uint16_t);
142 int	 proc_composev_imsg(struct privsep *, enum privsep_procid, int,
143 	    uint16_t, uint32_t, int, const struct iovec *, int);
144 int	 proc_composev(struct privsep *, enum privsep_procid,
145 	    uint16_t, const struct iovec *, int);
146 int	 proc_forward_imsg(struct privsep *, struct imsg *,
147 	    enum privsep_procid, int);
148 struct imsgbuf *
149 	 proc_ibuf(struct privsep *, enum privsep_procid, int);
150 struct imsgev *
151 	 proc_iev(struct privsep *, enum privsep_procid, int);
152 enum privsep_procid
153 	 proc_getid(struct privsep_proc *, unsigned int, const char *);
154 int	 proc_flush_imsg(struct privsep *, enum privsep_procid, int);
155 
156 /* log.c */
157 void	log_init(int, int);
158 void	log_procinit(const char *);
159 void	log_setverbose(int);
160 int	log_getverbose(void);
161 void	log_warn(const char *, ...)
162 	    __attribute__((__format__ (printf, 1, 2)));
163 void	log_warnx(const char *, ...)
164 	    __attribute__((__format__ (printf, 1, 2)));
165 void	log_info(const char *, ...)
166 	    __attribute__((__format__ (printf, 1, 2)));
167 void	log_debug(const char *, ...)
168 	    __attribute__((__format__ (printf, 1, 2)));
169 void	logit(int, const char *, ...)
170 	    __attribute__((__format__ (printf, 2, 3)));
171 void	vlog(int, const char *, va_list)
172 	    __attribute__((__format__ (printf, 2, 0)));
173 __dead void fatal(const char *, ...)
174 	    __attribute__((__format__ (printf, 1, 2)));
175 __dead void fatalx(const char *, ...)
176 	    __attribute__((__format__ (printf, 1, 2)));