Annotation of embedaddon/sudo/plugins/sudoers/find_path.c, revision 1.1.1.2
1.1 misho 1: /*
2: * Copyright (c) 1996, 1998-2005, 2010-2011
3: * Todd C. Miller <Todd.Miller@courtesan.com>
4: *
5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16: *
17: * Sponsored in part by the Defense Advanced Research Projects
18: * Agency (DARPA) and Air Force Research Laboratory, Air Force
19: * Materiel Command, USAF, under agreement number F39502-99-1-0512.
20: */
21:
22: #include <config.h>
23:
24: #include <sys/types.h>
25: #include <sys/param.h>
26: #include <sys/stat.h>
27: #include <stdio.h>
28: #ifdef STDC_HEADERS
29: # include <stdlib.h>
30: # include <stddef.h>
31: #else
32: # ifdef HAVE_STDLIB_H
33: # include <stdlib.h>
34: # endif
35: #endif /* STDC_HEADERS */
36: #ifdef HAVE_STRING_H
37: # include <string.h>
38: #endif /* HAVE_STRING_H */
39: #ifdef HAVE_STRINGS_H
40: # include <strings.h>
41: #endif /* HAVE_STRINGS_H */
42: #ifdef HAVE_UNISTD_H
43: # include <unistd.h>
44: #endif /* HAVE_UNISTD_H */
45: #include <errno.h>
46:
47: #include "sudoers.h"
48:
49: /*
50: * This function finds the full pathname for a command and
51: * stores it in a statically allocated array, filling in a pointer
52: * to the array. Returns FOUND if the command was found, NOT_FOUND
53: * if it was not found, or NOT_FOUND_DOT if it would have been found
54: * but it is in '.' and IGNORE_DOT is set.
55: */
56: int
57: find_path(char *infile, char **outfile, struct stat *sbp, char *path,
58: int ignore_dot)
59: {
60: static char command[PATH_MAX]; /* qualified filename */
61: char *n; /* for traversing path */
62: char *origpath; /* so we can free path later */
1.1.1.2 ! misho 63: bool found = false; /* did we find the command? */
! 64: bool checkdot = false; /* check current dir? */
1.1 misho 65: int len; /* length parameter */
1.1.1.2 ! misho 66: debug_decl(find_path, SUDO_DEBUG_UTIL)
1.1 misho 67:
68: if (strlen(infile) >= PATH_MAX)
69: errorx(1, _("%s: %s"), infile, strerror(ENAMETOOLONG));
70:
71: /*
72: * If we were given a fully qualified or relative path
73: * there is no need to look at $PATH.
74: */
75: if (strchr(infile, '/')) {
76: strlcpy(command, infile, sizeof(command)); /* paranoia */
77: if (sudo_goodpath(command, sbp)) {
78: *outfile = command;
1.1.1.2 ! misho 79: debug_return_int(FOUND);
1.1 misho 80: } else
1.1.1.2 ! misho 81: debug_return_int(NOT_FOUND);
1.1 misho 82: }
83:
84: if (path == NULL)
1.1.1.2 ! misho 85: debug_return_int(NOT_FOUND);
1.1 misho 86: path = estrdup(path);
87: origpath = path;
88:
89: do {
90: if ((n = strchr(path, ':')))
91: *n = '\0';
92:
93: /*
94: * Search current dir last if it is in PATH This will miss sneaky
95: * things like using './' or './/'
96: */
97: if (*path == '\0' || (*path == '.' && *(path + 1) == '\0')) {
98: checkdot = 1;
99: path = n + 1;
100: continue;
101: }
102:
103: /*
104: * Resolve the path and exit the loop if found.
105: */
106: len = snprintf(command, sizeof(command), "%s/%s", path, infile);
107: if (len <= 0 || len >= sizeof(command))
108: errorx(1, _("%s: %s"), infile, strerror(ENAMETOOLONG));
1.1.1.2 ! misho 109: if ((found = sudo_goodpath(command, sbp)))
1.1 misho 110: break;
111:
112: path = n + 1;
113:
114: } while (n);
115: efree(origpath);
116:
117: /*
118: * Check current dir if dot was in the PATH
119: */
1.1.1.2 ! misho 120: if (!found && checkdot) {
1.1 misho 121: len = snprintf(command, sizeof(command), "./%s", infile);
122: if (len <= 0 || len >= sizeof(command))
123: errorx(1, _("%s: %s"), infile, strerror(ENAMETOOLONG));
1.1.1.2 ! misho 124: found = sudo_goodpath(command, sbp);
! 125: if (found && ignore_dot)
! 126: debug_return_int(NOT_FOUND_DOT);
1.1 misho 127: }
128:
1.1.1.2 ! misho 129: if (found) {
! 130: *outfile = command;
! 131: debug_return_int(FOUND);
1.1 misho 132: } else
1.1.1.2 ! misho 133: debug_return_int(NOT_FOUND);
1.1 misho 134: }
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