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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: passphrase.c,v 1.3 2000/12/06 20:33:27 mdw Exp $ |
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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 $ |
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33 | * Revision 1.3 2000/12/06 20:33:27 mdw |
34 | * Make flags be macros rather than enumerations, to ensure that they're |
35 | * unsigned. |
36 | * |
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37 | * Revision 1.2 2000/06/17 11:49:37 mdw |
38 | * New pixie protocol allowing application to request passphrases and send |
39 | * them to the pixie. |
40 | * |
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41 | * Revision 1.1 1999/12/22 15:58:20 mdw |
42 | * Portable interface to reading passphrases. |
43 | * |
44 | */ |
45 | |
46 | /*----- Header files ------------------------------------------------------*/ |
47 | |
48 | #include <errno.h> |
49 | #include <stdio.h> |
50 | #include <stdlib.h> |
51 | #include <string.h> |
52 | |
53 | #include <unistd.h> |
54 | |
55 | #include <mLib/dstr.h> |
56 | |
57 | #include "passphrase.h" |
58 | #include "pixie.h" |
59 | |
60 | /*----- Static variables --------------------------------------------------*/ |
61 | |
62 | static int fd = -1; |
63 | static unsigned flags = 0; |
64 | |
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65 | #define f_fail 1u |
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66 | |
67 | /*----- Main code ---------------------------------------------------------*/ |
68 | |
69 | /* --- @pconn@ --- * |
70 | * |
71 | * Arguments: --- |
72 | * |
73 | * Returns: Zero if OK, nonzero if it failed |
74 | * |
75 | * Use: Attempts to connect to the passphrase pixie. |
76 | */ |
77 | |
78 | static int pconn(void) |
79 | { |
80 | if (fd != -1) |
81 | return (0); |
82 | if (flags & f_fail) |
83 | return (-1); |
84 | if ((fd = pixie_open(0)) < 0) { |
85 | flags |= f_fail; |
86 | return (-1); |
87 | } |
88 | return (0); |
89 | } |
90 | |
91 | /* --- @passphrase_read@ --- * |
92 | * |
93 | * Arguments: @const char *tag@ = pointer to passphrase tag string |
94 | * @unsigned mode@ = reading mode |
95 | * @char *buf@ = pointer to destination buffer |
96 | * @size_t sz@ = size of destination buffer |
97 | * |
98 | * Returns: Zero if successful, nonzero on failure. |
99 | * |
100 | * Use: Reads a passphrase from the user, using some system-specific |
101 | * secure mechanism. The mechanism may keep a cache of |
102 | * passphrases, so the user may not necessarily be prompted. |
103 | */ |
104 | |
105 | int passphrase_read(const char *tag, unsigned mode, char *buf, size_t sz) |
106 | { |
107 | dstr d = DSTR_INIT; |
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108 | int rc = 1; |
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109 | |
110 | /* --- Try talking to the pixie --- */ |
111 | |
112 | if (!pconn()) { |
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113 | rc = pixie_read(fd, tag, mode, buf, sz); |
114 | if (rc < 0) { |
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115 | close(fd); |
116 | fd = -1; |
117 | return (-1); |
118 | } |
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119 | if (rc == 0) |
120 | return (0); |
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121 | } |
122 | |
123 | /* --- Read from the terminal --- */ |
124 | |
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125 | dstr_putf(&d, "%s %s: ", |
126 | mode == PMODE_READ ? "Passphrase" : "New passphrase", |
127 | tag); |
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128 | if (pixie_getpass(d.buf, buf, sz)) |
129 | goto fail; |
130 | if (mode == PMODE_VERIFY) { |
131 | char b[1024]; |
132 | DRESET(&d); |
133 | dstr_putf(&d, "Verify passphrase %s: ", tag); |
134 | if (pixie_getpass(d.buf, b, sizeof(b)) || |
135 | strcmp(b, buf) != 0) { |
136 | memset(b, 0, sizeof(b)); |
137 | goto fail; |
138 | } |
139 | } |
140 | dstr_destroy(&d); |
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141 | |
142 | /* --- If the pixie is interested, tell it the new passphrase --- */ |
143 | |
144 | if (fd >= 0) |
145 | pixie_set(fd, tag, buf); |
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146 | return (0); |
147 | |
148 | /* --- Tidy up after a failure --- */ |
149 | |
150 | fail: |
151 | dstr_destroy(&d); |
152 | memset(buf, 0, sz); |
153 | return (-1); |
154 | } |
155 | |
156 | /* --- @passphrase_cancel@ --- * |
157 | * |
158 | * Arguments: @const char *tag@ = pointer to passphrase tag string |
159 | * |
160 | * Returns: --- |
161 | * |
162 | * Use: Attempts to make the passphrase cache forget about a |
163 | * particular passphrase. This may be useful if the passphrase |
164 | * turns out to be wrong, or if the user is attempting to change |
165 | * the passphrase. |
166 | */ |
167 | |
168 | void passphrase_cancel(const char *tag) |
169 | { |
170 | if (!pconn()) |
171 | pixie_cancel(fd, tag); |
172 | } |
173 | |
174 | /*----- That's all, folks -------------------------------------------------*/ |