9c5b124e |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: passphrase.c,v 1.1 1999/12/22 15:58:20 mdw Exp $ |
4 | * |
5 | * Reading of passphrases (Unix-specific) |
6 | * |
7 | * (c) 1999 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: passphrase.c,v $ |
33 | * Revision 1.1 1999/12/22 15:58:20 mdw |
34 | * Portable interface to reading passphrases. |
35 | * |
36 | */ |
37 | |
38 | /*----- Header files ------------------------------------------------------*/ |
39 | |
40 | #include <errno.h> |
41 | #include <stdio.h> |
42 | #include <stdlib.h> |
43 | #include <string.h> |
44 | |
45 | #include <unistd.h> |
46 | |
47 | #include <mLib/dstr.h> |
48 | |
49 | #include "passphrase.h" |
50 | #include "pixie.h" |
51 | |
52 | /*----- Static variables --------------------------------------------------*/ |
53 | |
54 | static int fd = -1; |
55 | static unsigned flags = 0; |
56 | |
57 | enum { |
58 | f_fail = 1 |
59 | }; |
60 | |
61 | /*----- Main code ---------------------------------------------------------*/ |
62 | |
63 | /* --- @pconn@ --- * |
64 | * |
65 | * Arguments: --- |
66 | * |
67 | * Returns: Zero if OK, nonzero if it failed |
68 | * |
69 | * Use: Attempts to connect to the passphrase pixie. |
70 | */ |
71 | |
72 | static int pconn(void) |
73 | { |
74 | if (fd != -1) |
75 | return (0); |
76 | if (flags & f_fail) |
77 | return (-1); |
78 | if ((fd = pixie_open(0)) < 0) { |
79 | flags |= f_fail; |
80 | return (-1); |
81 | } |
82 | return (0); |
83 | } |
84 | |
85 | /* --- @passphrase_read@ --- * |
86 | * |
87 | * Arguments: @const char *tag@ = pointer to passphrase tag string |
88 | * @unsigned mode@ = reading mode |
89 | * @char *buf@ = pointer to destination buffer |
90 | * @size_t sz@ = size of destination buffer |
91 | * |
92 | * Returns: Zero if successful, nonzero on failure. |
93 | * |
94 | * Use: Reads a passphrase from the user, using some system-specific |
95 | * secure mechanism. The mechanism may keep a cache of |
96 | * passphrases, so the user may not necessarily be prompted. |
97 | */ |
98 | |
99 | int passphrase_read(const char *tag, unsigned mode, char *buf, size_t sz) |
100 | { |
101 | dstr d = DSTR_INIT; |
102 | |
103 | /* --- Try talking to the pixie --- */ |
104 | |
105 | if (!pconn()) { |
106 | if (pixie_read(fd, tag, mode, buf, sz)) { |
107 | close(fd); |
108 | fd = -1; |
109 | return (-1); |
110 | } |
111 | return (0); |
112 | } |
113 | |
114 | /* --- Read from the terminal --- */ |
115 | |
116 | dstr_putf(&d, "Passphrase %s: ", tag); |
117 | if (pixie_getpass(d.buf, buf, sz)) |
118 | goto fail; |
119 | if (mode == PMODE_VERIFY) { |
120 | char b[1024]; |
121 | DRESET(&d); |
122 | dstr_putf(&d, "Verify passphrase %s: ", tag); |
123 | if (pixie_getpass(d.buf, b, sizeof(b)) || |
124 | strcmp(b, buf) != 0) { |
125 | memset(b, 0, sizeof(b)); |
126 | goto fail; |
127 | } |
128 | } |
129 | dstr_destroy(&d); |
130 | return (0); |
131 | |
132 | /* --- Tidy up after a failure --- */ |
133 | |
134 | fail: |
135 | dstr_destroy(&d); |
136 | memset(buf, 0, sz); |
137 | return (-1); |
138 | } |
139 | |
140 | /* --- @passphrase_cancel@ --- * |
141 | * |
142 | * Arguments: @const char *tag@ = pointer to passphrase tag string |
143 | * |
144 | * Returns: --- |
145 | * |
146 | * Use: Attempts to make the passphrase cache forget about a |
147 | * particular passphrase. This may be useful if the passphrase |
148 | * turns out to be wrong, or if the user is attempting to change |
149 | * the passphrase. |
150 | */ |
151 | |
152 | void passphrase_cancel(const char *tag) |
153 | { |
154 | if (!pconn()) |
155 | pixie_cancel(fd, tag); |
156 | } |
157 | |
158 | /*----- That's all, folks -------------------------------------------------*/ |