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1.1 misho 1: /*
2: * Copyright (c) 1993-1996,1998-2005, 2007-2013
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 <stdio.h>
26: #ifdef STDC_HEADERS
27: # include <stdlib.h>
28: # include <stddef.h>
29: #else
30: # ifdef HAVE_STDLIB_H
31: # include <stdlib.h>
32: # endif
33: #endif /* STDC_HEADERS */
34: #ifdef HAVE_STRING_H
35: # include <string.h>
36: #endif /* HAVE_STRING_H */
37: #ifdef HAVE_STRINGS_H
38: # include <strings.h>
39: #endif /* HAVE_STRINGS_H */
40: #include <pwd.h>
41: #include <grp.h>
42:
43: #include "sudoers.h"
44:
45: /*
46: * Expand %h and %u escapes in the prompt and pass back the dynamically
47: * allocated result. Returns the same string if there are no escapes.
48: */
49: char *
1.1.1.2 ! misho 50: expand_prompt(const char *old_prompt, const char *auth_user)
1.1 misho 51: {
52: size_t len, n;
53: int subst;
54: const char *p;
55: char *np, *new_prompt, *endp;
56: debug_decl(expand_prompt, SUDO_DEBUG_AUTH)
57:
58: /* How much space do we need to malloc for the prompt? */
59: subst = 0;
60: for (p = old_prompt, len = strlen(old_prompt); *p; p++) {
61: if (p[0] =='%') {
62: switch (p[1]) {
63: case 'h':
64: p++;
65: len += strlen(user_shost) - 2;
66: subst = 1;
67: break;
68: case 'H':
69: p++;
70: len += strlen(user_host) - 2;
71: subst = 1;
72: break;
73: case 'p':
74: p++;
1.1.1.2 ! misho 75: len += strlen(auth_user) - 2;
1.1 misho 76: subst = 1;
77: break;
78: case 'u':
79: p++;
80: len += strlen(user_name) - 2;
81: subst = 1;
82: break;
83: case 'U':
84: p++;
85: len += strlen(runas_pw->pw_name) - 2;
86: subst = 1;
87: break;
88: case '%':
89: p++;
90: len--;
91: subst = 1;
92: break;
93: default:
94: break;
95: }
96: }
97: }
98:
99: if (subst) {
100: new_prompt = emalloc(++len);
101: endp = new_prompt + len;
102: for (p = old_prompt, np = new_prompt; *p; p++) {
103: if (p[0] =='%') {
104: switch (p[1]) {
105: case 'h':
106: p++;
107: n = strlcpy(np, user_shost, np - endp);
1.1.1.2 ! misho 108: if (n >= (size_t)(np - endp))
1.1 misho 109: goto oflow;
110: np += n;
111: continue;
112: case 'H':
113: p++;
114: n = strlcpy(np, user_host, np - endp);
1.1.1.2 ! misho 115: if (n >= (size_t)(np - endp))
1.1 misho 116: goto oflow;
117: np += n;
118: continue;
119: case 'p':
120: p++;
1.1.1.2 ! misho 121: n = strlcpy(np, auth_user, np - endp);
! 122: if (n >= (size_t)(np - endp))
1.1 misho 123: goto oflow;
124: np += n;
125: continue;
126: case 'u':
127: p++;
128: n = strlcpy(np, user_name, np - endp);
1.1.1.2 ! misho 129: if (n >= (size_t)(np - endp))
1.1 misho 130: goto oflow;
131: np += n;
132: continue;
133: case 'U':
134: p++;
135: n = strlcpy(np, runas_pw->pw_name, np - endp);
1.1.1.2 ! misho 136: if (n >= (size_t)(np - endp))
1.1 misho 137: goto oflow;
138: np += n;
139: continue;
140: case '%':
141: /* convert %% -> % */
142: p++;
143: break;
144: default:
145: /* no conversion */
146: break;
147: }
148: }
149: *np++ = *p;
150: if (np >= endp)
151: goto oflow;
152: }
153: *np = '\0';
154: } else
155: new_prompt = estrdup(old_prompt);
156:
157: debug_return_str(new_prompt);
158:
159: oflow:
160: /* We pre-allocate enough space, so this should never happen. */
1.1.1.2 ! misho 161: fatalx(U_("internal error, %s overflow"), "expand_prompt()");
1.1 misho 162: }