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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: passphrase.c,v 1.6 2004/04/08 01:36:15 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 | |
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30 | /*----- Header files ------------------------------------------------------*/ |
31 | |
32 | #include <errno.h> |
33 | #include <stdio.h> |
34 | #include <stdlib.h> |
35 | #include <string.h> |
36 | |
37 | #include <unistd.h> |
38 | |
39 | #include <mLib/dstr.h> |
40 | |
41 | #include "passphrase.h" |
42 | #include "pixie.h" |
43 | |
44 | /*----- Static variables --------------------------------------------------*/ |
45 | |
46 | static int fd = -1; |
47 | static unsigned flags = 0; |
48 | |
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49 | #define f_fail 1u |
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50 | |
51 | /*----- Main code ---------------------------------------------------------*/ |
52 | |
53 | /* --- @pconn@ --- * |
54 | * |
55 | * Arguments: --- |
56 | * |
57 | * Returns: Zero if OK, nonzero if it failed |
58 | * |
59 | * Use: Attempts to connect to the passphrase pixie. |
60 | */ |
61 | |
62 | static int pconn(void) |
63 | { |
64 | if (fd != -1) |
65 | return (0); |
66 | if (flags & f_fail) |
67 | return (-1); |
68 | if ((fd = pixie_open(0)) < 0) { |
69 | flags |= f_fail; |
70 | return (-1); |
71 | } |
72 | return (0); |
73 | } |
74 | |
75 | /* --- @passphrase_read@ --- * |
76 | * |
77 | * Arguments: @const char *tag@ = pointer to passphrase tag string |
78 | * @unsigned mode@ = reading mode |
79 | * @char *buf@ = pointer to destination buffer |
80 | * @size_t sz@ = size of destination buffer |
81 | * |
82 | * Returns: Zero if successful, nonzero on failure. |
83 | * |
84 | * Use: Reads a passphrase from the user, using some system-specific |
85 | * secure mechanism. The mechanism may keep a cache of |
86 | * passphrases, so the user may not necessarily be prompted. |
87 | */ |
88 | |
89 | int passphrase_read(const char *tag, unsigned mode, char *buf, size_t sz) |
90 | { |
91 | dstr d = DSTR_INIT; |
95959d10 |
92 | int rc = 1; |
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93 | |
94 | /* --- Try talking to the pixie --- */ |
95 | |
96 | if (!pconn()) { |
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97 | rc = pixie_read(fd, tag, mode, buf, sz); |
98 | if (rc < 0) { |
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99 | close(fd); |
100 | fd = -1; |
101 | return (-1); |
102 | } |
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103 | if (rc == 0) |
104 | return (0); |
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105 | } |
106 | |
107 | /* --- Read from the terminal --- */ |
108 | |
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109 | dstr_putf(&d, "%s %s: ", |
110 | mode == PMODE_READ ? "Passphrase" : "New passphrase", |
111 | tag); |
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112 | if (pixie_getpass(d.buf, buf, sz)) |
113 | goto fail; |
114 | if (mode == PMODE_VERIFY) { |
115 | char b[1024]; |
116 | DRESET(&d); |
117 | dstr_putf(&d, "Verify passphrase %s: ", tag); |
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118 | if (pixie_getpass(d.buf, b, sizeof(b)) || strcmp(b, buf) != 0) { |
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119 | memset(b, 0, sizeof(b)); |
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120 | goto fail; |
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121 | } |
122 | } |
123 | dstr_destroy(&d); |
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124 | |
125 | /* --- If the pixie is interested, tell it the new passphrase --- */ |
126 | |
127 | if (fd >= 0) |
128 | pixie_set(fd, tag, buf); |
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129 | return (0); |
130 | |
131 | /* --- Tidy up after a failure --- */ |
132 | |
133 | fail: |
134 | dstr_destroy(&d); |
135 | memset(buf, 0, sz); |
136 | return (-1); |
137 | } |
138 | |
139 | /* --- @passphrase_cancel@ --- * |
140 | * |
141 | * Arguments: @const char *tag@ = pointer to passphrase tag string |
142 | * |
143 | * Returns: --- |
144 | * |
145 | * Use: Attempts to make the passphrase cache forget about a |
146 | * particular passphrase. This may be useful if the passphrase |
147 | * turns out to be wrong, or if the user is attempting to change |
148 | * the passphrase. |
149 | */ |
150 | |
151 | void passphrase_cancel(const char *tag) |
152 | { |
153 | if (!pconn()) |
154 | pixie_cancel(fd, tag); |
155 | } |
156 | |
157 | /*----- That's all, folks -------------------------------------------------*/ |