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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/*
* Copyright (c) 1996, 1998-2000, 2004, 2007-2009
* Todd C. Miller <Todd.Miller@courtesan.com>
*
* 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_PARSE_H
#define _SUDO_PARSE_H
#undef UNSPEC
#define UNSPEC -1
#undef DENY
#define DENY 0
#undef ALLOW
#define ALLOW 1
#undef IMPLIED
#define IMPLIED 2
/*
* A command with args. XXX - merge into struct member.
*/
struct sudo_command {
char *cmnd;
char *args;
};
/*
* Tags associated with a command.
* Possible valus: TRUE, FALSE, UNSPEC.
*/
struct cmndtag {
__signed char nopasswd;
__signed char noexec;
__signed char setenv;
__signed char extra;
};
/*
* SELinux-specific container struct.
* Currently just contains a role and type.
*/
struct selinux_info {
char *role;
char *type;
};
/*
* The parses sudoers file is stored as a collection of linked lists,
* modelled after the yacc grammar.
*
* Other than the alias struct, which is stored in a red-black tree,
* the data structure used is basically a doubly-linked tail queue without
* a separate head struct--the first entry acts as the head where the prev
* pointer does double duty as the tail pointer. This makes it possible
* to trivally append sub-lists. In addition, the prev pointer is always
* valid (even if it points to itself). Unlike a circle queue, the next
* pointer of the last entry is NULL and does not point back to the head.
*
* Note that each list struct must contain a "prev" and "next" pointer as
* the first two members of the struct (in that order).
*/
/*
* Tail queue list head structure.
*/
TQ_DECLARE(defaults)
TQ_DECLARE(userspec)
TQ_DECLARE(member)
TQ_DECLARE(privilege)
TQ_DECLARE(cmndspec)
/*
* Structure describing a user specification and list thereof.
*/
struct userspec {
struct userspec *prev, *next;
struct member_list users; /* list of users */
struct privilege_list privileges; /* list of privileges */
};
/*
* Structure describing a privilege specification.
*/
struct privilege {
struct privilege *prev, *next;
struct member_list hostlist; /* list of hosts */
struct cmndspec_list cmndlist; /* list of Cmnd_Specs */
};
/*
* Structure describing a linked list of Cmnd_Specs.
*/
struct cmndspec {
struct cmndspec *prev, *next;
struct member_list runasuserlist; /* list of runas users */
struct member_list runasgrouplist; /* list of runas groups */
struct member *cmnd; /* command to allow/deny */
struct cmndtag tags; /* tag specificaion */
#ifdef HAVE_SELINUX
char *role, *type; /* SELinux role and type */
#endif
};
/*
* Generic structure to hold users, hosts, commands.
*/
struct member {
struct member *prev, *next;
char *name; /* member name */
short type; /* type (see gram.h) */
short negated; /* negated via '!'? */
};
struct runascontainer {
struct member *runasusers;
struct member *runasgroups;
};
/*
* Generic structure to hold {User,Host,Runas,Cmnd}_Alias
* Aliases are stored in a red-black tree, sorted by name and type.
*/
struct alias {
char *name; /* alias name */
unsigned short type; /* {USER,HOST,RUNAS,CMND}ALIAS */
unsigned short seqno; /* sequence number */
struct member_list members; /* list of alias members */
};
/*
* Structure describing a Defaults entry and a list thereof.
*/
struct defaults {
struct defaults *prev, *next;
char *var; /* variable name */
char *val; /* variable value */
struct member_list binding; /* user/host/runas binding */
int type; /* DEFAULTS{,_USER,_RUNAS,_HOST} */
int op; /* TRUE, FALSE, '+', '-' */
};
/*
* Parsed sudoers info.
*/
extern struct userspec_list userspecs;
extern struct defaults_list defaults;
/*
* Alias sequence number to avoid loops.
*/
extern unsigned int alias_seqno;
/*
* Prototypes
*/
char *alias_add __P((char *, int, struct member *));
int addr_matches __P((char *));
int cmnd_matches __P((struct member *));
int cmndlist_matches __P((struct member_list *));
int command_matches __P((char *, char *));
int hostlist_matches __P((struct member_list *));
int hostname_matches __P((char *, char *, char *));
int netgr_matches __P((char *, char *, char *, char *));
int no_aliases __P((void));
int runaslist_matches __P((struct member_list *, struct member_list *));
int userlist_matches __P((struct passwd *, struct member_list *));
int usergr_matches __P((char *, char *, struct passwd *));
int userpw_matches __P((char *, char *, struct passwd *));
int group_matches __P((char *, struct group *));
struct alias *alias_find __P((char *, int));
struct alias *alias_remove __P((char *, int));
void alias_free __P((void *));
void alias_apply __P((int (*)(void *, void *), void *));
void init_aliases __P((void));
void init_lexer __P((void));
void init_parser __P((char *, int));
int alias_compare __P((const void *, const void *));
#endif /* _SUDO_PARSE_H */
|
