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1 | /* -*-c-*- |
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2 | * |
3 | * Reading of passphrases (Unix-specific) |
4 | * |
5 | * (c) 1999 Straylight/Edgeware |
6 | */ |
7 | |
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8 | /*----- Licensing notice --------------------------------------------------* |
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9 | * |
10 | * This file is part of Catacomb. |
11 | * |
12 | * Catacomb is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU Library General Public License as |
14 | * published by the Free Software Foundation; either version 2 of the |
15 | * License, or (at your option) any later version. |
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16 | * |
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17 | * Catacomb is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
20 | * GNU Library General Public License for more details. |
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21 | * |
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22 | * You should have received a copy of the GNU Library General Public |
23 | * License along with Catacomb; if not, write to the Free |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
25 | * MA 02111-1307, USA. |
26 | */ |
27 | |
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28 | /*----- Header files ------------------------------------------------------*/ |
29 | |
30 | #include <errno.h> |
31 | #include <stdio.h> |
32 | #include <stdlib.h> |
33 | #include <string.h> |
34 | |
35 | #include <unistd.h> |
36 | |
37 | #include <mLib/dstr.h> |
38 | |
39 | #include "passphrase.h" |
40 | #include "pixie.h" |
41 | |
42 | /*----- Static variables --------------------------------------------------*/ |
43 | |
44 | static int fd = -1; |
45 | static unsigned flags = 0; |
46 | |
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47 | #define f_fail 1u |
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48 | |
49 | /*----- Main code ---------------------------------------------------------*/ |
50 | |
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51 | /* --- @passphrase_connect@ --- |
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52 | * |
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53 | * Arguments: @const char *sock@ = socket name to connect to, or null for |
54 | * default |
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55 | * |
56 | * Returns: Zero if OK, nonzero if it failed |
57 | * |
58 | * Use: Attempts to connect to the passphrase pixie. |
59 | */ |
60 | |
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61 | int passphrase_connect(const char *sock) |
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62 | { |
63 | if (fd != -1) |
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64 | close(fd); |
65 | if ((fd = pixie_open(sock)) < 0) { |
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66 | flags |= f_fail; |
67 | return (-1); |
68 | } |
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69 | flags &= ~f_fail; |
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70 | return (0); |
71 | } |
72 | |
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73 | static int pconn(void) |
74 | { |
75 | if (fd != -1) |
76 | return (0); |
77 | if (flags & f_fail) |
78 | return (-1); |
79 | return (passphrase_connect(0)); |
80 | } |
81 | |
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82 | /* --- @passphrase_read@ --- * |
83 | * |
84 | * Arguments: @const char *tag@ = pointer to passphrase tag string |
85 | * @unsigned mode@ = reading mode |
86 | * @char *buf@ = pointer to destination buffer |
87 | * @size_t sz@ = size of destination buffer |
88 | * |
89 | * Returns: Zero if successful, nonzero on failure. |
90 | * |
91 | * Use: Reads a passphrase from the user, using some system-specific |
92 | * secure mechanism. The mechanism may keep a cache of |
93 | * passphrases, so the user may not necessarily be prompted. |
94 | */ |
95 | |
96 | int passphrase_read(const char *tag, unsigned mode, char *buf, size_t sz) |
97 | { |
98 | dstr d = DSTR_INIT; |
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99 | int rc = 1; |
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100 | |
101 | /* --- Try talking to the pixie --- */ |
102 | |
103 | if (!pconn()) { |
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104 | rc = pixie_read(fd, tag, mode, buf, sz); |
105 | if (rc < 0) { |
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106 | close(fd); |
107 | fd = -1; |
108 | return (-1); |
109 | } |
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110 | if (rc == 0) |
111 | return (0); |
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112 | } |
113 | |
114 | /* --- Read from the terminal --- */ |
115 | |
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116 | dstr_putf(&d, "%s %s: ", |
117 | mode == PMODE_READ ? "Passphrase" : "New passphrase", |
118 | tag); |
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119 | if (pixie_getpass(d.buf, buf, sz)) |
120 | goto fail; |
121 | if (mode == PMODE_VERIFY) { |
122 | char b[1024]; |
123 | DRESET(&d); |
124 | dstr_putf(&d, "Verify passphrase %s: ", tag); |
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125 | if (pixie_getpass(d.buf, b, sizeof(b)) || strcmp(b, buf) != 0) { |
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126 | memset(b, 0, sizeof(b)); |
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127 | goto fail; |
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128 | } |
129 | } |
130 | dstr_destroy(&d); |
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131 | |
132 | /* --- If the pixie is interested, tell it the new passphrase --- */ |
133 | |
134 | if (fd >= 0) |
135 | pixie_set(fd, tag, buf); |
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136 | return (0); |
137 | |
138 | /* --- Tidy up after a failure --- */ |
139 | |
140 | fail: |
141 | dstr_destroy(&d); |
142 | memset(buf, 0, sz); |
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143 | return (-1); |
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144 | } |
145 | |
146 | /* --- @passphrase_cancel@ --- * |
147 | * |
148 | * Arguments: @const char *tag@ = pointer to passphrase tag string |
149 | * |
150 | * Returns: --- |
151 | * |
152 | * Use: Attempts to make the passphrase cache forget about a |
153 | * particular passphrase. This may be useful if the passphrase |
154 | * turns out to be wrong, or if the user is attempting to change |
155 | * the passphrase. |
156 | */ |
157 | |
158 | void passphrase_cancel(const char *tag) |
159 | { |
160 | if (!pconn()) |
161 | pixie_cancel(fd, tag); |
162 | } |
163 | |
164 | /*----- That's all, folks -------------------------------------------------*/ |