summaryrefslogtreecommitdiff
path: root/src/sudo_exec.h
blob: 2f099a33255a65b13e5d5f5b301307bf34a21ddf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
/*
 * SPDX-License-Identifier: ISC
 *
 * Copyright (c) 2010-2017, 2020-2022 Todd C. Miller <Todd.Miller@sudo.ws>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef SUDO_EXEC_H
#define SUDO_EXEC_H

/*
 * Older systems may not support MSG_WAITALL but it shouldn't really be needed.
 */
#ifndef MSG_WAITALL
# define MSG_WAITALL 0
#endif

/*
 * Some older systems support siginfo but predate SI_USER.
 */
#ifdef SI_USER
# define USER_SIGNALED(_info) ((_info) != NULL && (_info)->si_code == SI_USER)
#else
# define USER_SIGNALED(_info) ((_info) != NULL && (_info)->si_code <= 0)
#endif

/*
 * Indices into io_fds[] when running a command in a pty.
 */
#define SFD_STDIN	0
#define SFD_STDOUT	1
#define SFD_STDERR	2
#define SFD_LEADER	3
#define SFD_FOLLOWER	4
#define SFD_USERTTY	5

/*
 * Special values to indicate whether continuing in foreground or background.
 */
#define SIGCONT_FG	-2
#define SIGCONT_BG	-3

/*
 * Positions in saved_signals[]
 */
#define SAVED_SIGALRM	 0
#define SAVED_SIGCHLD	 1
#define SAVED_SIGCONT	 2
#define SAVED_SIGHUP	 3
#define SAVED_SIGINT	 4
#define SAVED_SIGPIPE	 5
#define SAVED_SIGQUIT	 6
#define SAVED_SIGTERM	 7
#define SAVED_SIGTSTP	 8
#define SAVED_SIGTTIN	 9
#define SAVED_SIGTTOU	10
#define SAVED_SIGUSR1	11
#define SAVED_SIGUSR2	12

/*
 * Error codes for sesh
 */
#define SESH_SUCCESS	    0		/* successful operation */
#define SESH_ERR_FAILURE    1		/* unspecified error */
#define SESH_ERR_KILLED     2		/* killed by a signal */
#define SESH_ERR_INVALID    30		/* invalid -e arg value */
#define SESH_ERR_BAD_PATHS  31		/* odd number of paths */
#define SESH_ERR_NO_FILES   32		/* copy error, no files copied */
#define SESH_ERR_SOME_FILES 33		/* copy error, some files copied */

#define INTERCEPT_FD_MIN    64		/* minimum fd so shell won't close it */
#define MESSAGE_SIZE_MAX    2097152	/* 2Mib max intercept message size */

union sudo_token_un {
    unsigned char u8[16];
    unsigned int u32[4];
    unsigned long long u64[2];
};

#define sudo_token_isset(_t) ((_t).u64[0] || (_t).u64[1])

/*
 * Use ptrace-based intercept (using seccomp) on Linux if possible.
 * On MIPS we can't change the syscall return and only support log_subcmds.
 */
#if defined(_PATH_SUDO_INTERCEPT) && defined(__linux__)
# if defined(HAVE_DECL_SECCOMP_MODE_FILTER) && HAVE_DECL_SECCOMP_MODE_FILTER
#  if defined(__x86_64__) || defined(__i386__) || defined(__aarch64__) || defined(__arm__) || defined(__mips__) || defined(__powerpc__) || (defined(__riscv) && __riscv_xlen == 64) || defined(__s390__)
#   ifndef HAVE_PTRACE_INTERCEPT
#    define HAVE_PTRACE_INTERCEPT 1
#   endif /* HAVE_PTRACE_INTERCEPT */
#  endif /* __amd64__ || __i386__ || __aarch64__ || __riscv || __s390__ */
# endif /* HAVE_DECL_SECCOMP_MODE_FILTER */
#endif /* _PATH_SUDO_INTERCEPT && __linux__ */

/*
 * Symbols shared between exec.c, exec_nopty.c, exec_pty.c and exec_monitor.c
 */
struct command_details;
struct command_status;
struct sudo_event_base;
struct stat;

/* exec.c */
void exec_cmnd(struct command_details *details, sigset_t *mask, int intercept_fd, int errfd);
void terminate_command(pid_t pid, bool use_pgrp);
bool sudo_terminated(struct command_status *cstat);

/* exec_common.c */
int sudo_execve(int fd, const char *path, char *const argv[], char *envp[], int intercept_fd, int flags);
char **disable_execute(char *envp[], const char *dso);
char **enable_monitor(char *envp[], const char *dso);

/* exec_intercept.c */
void *intercept_setup(int fd, struct sudo_event_base *evbase, struct command_details *details);
void intercept_cleanup(void);

/* exec_nopty.c */
void exec_nopty(struct command_details *details, struct command_status *cstat);

/* exec_pty.c */
bool exec_pty(struct command_details *details, struct command_status *cstat);
void pty_cleanup(void);
int pty_make_controlling(void);
extern int io_fds[6];

/* exec_monitor.c */
int exec_monitor(struct command_details *details, sigset_t *omask, bool foreground, int backchannel, int intercept_fd);

/* utmp.c */
bool utmp_login(const char *from_line, const char *to_line, int ttyfd,
    const char *user);
bool utmp_logout(const char *line, int status);

/* exec_preload.c */
char **sudo_preload_dso(char *envp[], const char *dso_file, int intercept_fd);

/* exec_ptrace.c */
bool exec_ptrace_stopped(pid_t pid, int status, void *intercept);
bool set_exec_filter(void);
int exec_ptrace_seize(pid_t child);

/* suspend_nopty.c */
void suspend_sudo_nopty(int signo, pid_t ppgrp, pid_t cmnd_pid);

#endif /* SUDO_EXEC_H */