9c5b124e |
1 | /* -*-c-*- |
2 | * |
9c5b124e |
3 | * Reading of passphrases (Unix-specific) |
4 | * |
5 | * (c) 1999 Straylight/Edgeware |
6 | */ |
7 | |
45c0fd36 |
8 | /*----- Licensing notice --------------------------------------------------* |
9c5b124e |
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. |
45c0fd36 |
16 | * |
9c5b124e |
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. |
45c0fd36 |
21 | * |
9c5b124e |
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 | |
9c5b124e |
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> |
141c1284 |
38 | #include <mLib/macros.h> |
9c5b124e |
39 | |
40 | #include "passphrase.h" |
41 | #include "pixie.h" |
42 | |
43 | /*----- Static variables --------------------------------------------------*/ |
44 | |
45 | static int fd = -1; |
46 | static unsigned flags = 0; |
47 | |
16efd15b |
48 | #define f_fail 1u |
9c5b124e |
49 | |
50 | /*----- Main code ---------------------------------------------------------*/ |
51 | |
025c5f4a |
52 | /* --- @passphrase_connect@ --- |
9c5b124e |
53 | * |
025c5f4a |
54 | * Arguments: @const char *sock@ = socket name to connect to, or null for |
55 | * default |
9c5b124e |
56 | * |
57 | * Returns: Zero if OK, nonzero if it failed |
58 | * |
59 | * Use: Attempts to connect to the passphrase pixie. |
60 | */ |
61 | |
025c5f4a |
62 | int passphrase_connect(const char *sock) |
9c5b124e |
63 | { |
64 | if (fd != -1) |
025c5f4a |
65 | close(fd); |
66 | if ((fd = pixie_open(sock)) < 0) { |
9c5b124e |
67 | flags |= f_fail; |
68 | return (-1); |
69 | } |
025c5f4a |
70 | flags &= ~f_fail; |
9c5b124e |
71 | return (0); |
72 | } |
73 | |
025c5f4a |
74 | static int pconn(void) |
75 | { |
76 | if (fd != -1) |
77 | return (0); |
78 | if (flags & f_fail) |
79 | return (-1); |
80 | return (passphrase_connect(0)); |
81 | } |
82 | |
9c5b124e |
83 | /* --- @passphrase_read@ --- * |
84 | * |
85 | * Arguments: @const char *tag@ = pointer to passphrase tag string |
86 | * @unsigned mode@ = reading mode |
87 | * @char *buf@ = pointer to destination buffer |
88 | * @size_t sz@ = size of destination buffer |
89 | * |
90 | * Returns: Zero if successful, nonzero on failure. |
91 | * |
92 | * Use: Reads a passphrase from the user, using some system-specific |
93 | * secure mechanism. The mechanism may keep a cache of |
94 | * passphrases, so the user may not necessarily be prompted. |
95 | */ |
96 | |
97 | int passphrase_read(const char *tag, unsigned mode, char *buf, size_t sz) |
98 | { |
99 | dstr d = DSTR_INIT; |
95959d10 |
100 | int rc = 1; |
9c5b124e |
101 | |
102 | /* --- Try talking to the pixie --- */ |
103 | |
104 | if (!pconn()) { |
95959d10 |
105 | rc = pixie_read(fd, tag, mode, buf, sz); |
106 | if (rc < 0) { |
9c5b124e |
107 | close(fd); |
108 | fd = -1; |
109 | return (-1); |
110 | } |
95959d10 |
111 | if (rc == 0) |
112 | return (0); |
9c5b124e |
113 | } |
114 | |
115 | /* --- Read from the terminal --- */ |
116 | |
95959d10 |
117 | dstr_putf(&d, "%s %s: ", |
118 | mode == PMODE_READ ? "Passphrase" : "New passphrase", |
119 | tag); |
9c5b124e |
120 | if (pixie_getpass(d.buf, buf, sz)) |
121 | goto fail; |
122 | if (mode == PMODE_VERIFY) { |
123 | char b[1024]; |
124 | DRESET(&d); |
125 | dstr_putf(&d, "Verify passphrase %s: ", tag); |
141c1284 |
126 | if (pixie_getpass(d.buf, b, sizeof(b)) || STRCMP(b, !=, buf)) { |
9c5b124e |
127 | memset(b, 0, sizeof(b)); |
14d553d6 |
128 | goto fail; |
9c5b124e |
129 | } |
130 | } |
131 | dstr_destroy(&d); |
95959d10 |
132 | |
133 | /* --- If the pixie is interested, tell it the new passphrase --- */ |
134 | |
135 | if (fd >= 0) |
136 | pixie_set(fd, tag, buf); |
9c5b124e |
137 | return (0); |
138 | |
139 | /* --- Tidy up after a failure --- */ |
140 | |
141 | fail: |
142 | dstr_destroy(&d); |
143 | memset(buf, 0, sz); |
45c0fd36 |
144 | return (-1); |
9c5b124e |
145 | } |
146 | |
147 | /* --- @passphrase_cancel@ --- * |
148 | * |
149 | * Arguments: @const char *tag@ = pointer to passphrase tag string |
150 | * |
151 | * Returns: --- |
152 | * |
153 | * Use: Attempts to make the passphrase cache forget about a |
154 | * particular passphrase. This may be useful if the passphrase |
155 | * turns out to be wrong, or if the user is attempting to change |
156 | * the passphrase. |
157 | */ |
158 | |
159 | void passphrase_cancel(const char *tag) |
160 | { |
161 | if (!pconn()) |
162 | pixie_cancel(fd, tag); |
163 | } |
164 | |
165 | /*----- That's all, folks -------------------------------------------------*/ |