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1 | /* -*-c-*- |
2 | * |
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3 | * $Id$ |
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4 | * |
5 | * Simple passphrase pixie client (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 <sys/types.h> |
38 | #include <unistd.h> |
39 | #include <fcntl.h> |
40 | #include <pwd.h> |
41 | |
42 | #include <sys/socket.h> |
43 | #include <sys/un.h> |
44 | |
45 | #include <mLib/dstr.h> |
46 | #include <mLib/fdflags.h> |
47 | #include <mLib/str.h> |
48 | |
49 | #include "passphrase.h" |
50 | #include "pixie.h" |
51 | |
52 | /*----- Main code ---------------------------------------------------------*/ |
53 | |
54 | /* --- @pixie_open@ --- * |
55 | * |
56 | * Arguments: @const char *sock@ = path to pixie socket |
57 | * |
58 | * Returns: Less than zero if it failed, or file descriptor. |
59 | * |
60 | * Use: Opens a connection to a passphrase pixie. |
61 | */ |
62 | |
63 | int pixie_open(const char *sock) |
64 | { |
65 | struct sockaddr_un *sun; |
66 | size_t sz; |
67 | int fd; |
68 | |
69 | /* --- Open the connection --- */ |
70 | |
71 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
72 | goto fail_0; |
73 | sun = pixie_address(sock, &sz); |
74 | if (connect(fd, (struct sockaddr *)sun, sz)) |
75 | goto fail_1; |
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76 | xfree(sun); |
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77 | return (fd); |
78 | |
79 | /* --- Tidy up if things went wrong --- */ |
80 | |
81 | fail_1: |
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82 | xfree(sun); |
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83 | close(fd); |
84 | fail_0: |
85 | return (-1); |
86 | } |
87 | |
88 | /* --- @pixie_read@ --- * |
89 | * |
90 | * Arguments: @int fd@ = connection to passphrase pixie |
91 | * @const char *tag@ = pointer to tag string |
92 | * @unsigned mode@ = reading mode |
93 | * @char *buf@ = pointer to destination buffer |
94 | * @size_t sz@ = size of the buffer |
95 | * |
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96 | * Returns: Zero if all went well, @-1@ if the read fails, @+1@ to |
97 | * request the passphrase from the user. |
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98 | * |
99 | * Use: Reads a passphrase from the pixie. |
100 | */ |
101 | |
102 | int pixie_read(int fd, const char *tag, unsigned mode, char *buf, size_t sz) |
103 | { |
104 | dstr d = DSTR_INIT; |
105 | char *p, *q; |
106 | |
107 | /* --- Send the request --- */ |
108 | |
109 | dstr_putf(&d, "%s %s\n", mode == PMODE_READ ? "PASS" : "VERIFY", tag); |
110 | write(fd, d.buf, d.len); |
111 | dstr_destroy(&d); |
112 | |
113 | /* --- Sort out the result --- */ |
114 | |
115 | again: |
116 | pixie_fdline(fd, buf, sz); |
117 | p = buf; |
118 | if ((q = str_getword(&p)) == 0) |
119 | return (-1); |
120 | if (strcmp(q, "INFO") == 0) |
121 | goto again; |
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122 | else if (strcmp(q, "MISSING") == 0) |
123 | return (+1); |
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124 | else if (strcmp(q, "OK") != 0) |
125 | return (-1); |
126 | |
127 | /* --- Return the final answer --- */ |
128 | |
129 | if (p) |
130 | memmove(buf, p, strlen(p) + 1); |
131 | else |
132 | *buf = 0; |
133 | return (0); |
134 | } |
135 | |
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136 | /* --- @pixie_set@ --- * |
137 | * |
138 | * Arguments: @int fd@ = pixie file descriptor |
139 | * @const char *tag@ = pointer to tag string |
140 | * @const char *phrase@ = pointer to passphrase string |
141 | * |
142 | * Returns: --- |
143 | * |
144 | * Use: Sends a passphrase to the passphrase pixie. |
145 | */ |
146 | |
147 | void pixie_set(int fd, const char *tag, const char *phrase) |
148 | { |
149 | dstr d = DSTR_INIT; |
150 | char buf[16]; |
151 | size_t sz = strlen(phrase); |
152 | char nl = '\n'; |
153 | char *p, *q; |
154 | |
155 | /* --- Send the request --- * |
156 | * |
157 | * I didn't want to copy it out of the caller's buffer. @writev@ may |
158 | * produce a copy, too, so I didn't do that either. |
159 | */ |
160 | |
161 | dstr_putf(&d, "SET %s -- ", tag); |
162 | write(fd, d.buf, d.len); |
163 | write(fd, phrase, sz); |
164 | write(fd, &nl, 1); |
165 | dstr_destroy(&d); |
166 | |
167 | /* --- Pick up the pieces --- */ |
168 | |
169 | again: |
170 | pixie_fdline(fd, buf, sizeof(buf)); |
171 | p = buf; |
172 | if ((q = str_getword(&p)) != 0 && strcmp(q, "INFO") == 0) |
173 | goto again; |
174 | } |
175 | |
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176 | /* --- @pixie_cancel@ --- * |
177 | * |
178 | * Arguments: @int fd@ = pixie file descriptor |
179 | * @const char *tag@ = pointer to tag string |
180 | * |
181 | * Returns: --- |
182 | * |
183 | * Use: Cancels a passphrase if it turns out to be bogus. |
184 | */ |
185 | |
186 | void pixie_cancel(int fd, const char *tag) |
187 | { |
188 | dstr d = DSTR_INIT; |
189 | char buf[16]; |
190 | char *p, *q; |
191 | |
192 | /* --- Send the request --- */ |
193 | |
194 | dstr_putf(&d, "FLUSH %s\n", tag); |
195 | write(fd, d.buf, d.len); |
196 | dstr_destroy(&d); |
197 | |
198 | /* --- Sort out the result --- */ |
199 | |
200 | again: |
201 | pixie_fdline(fd, buf, sizeof(buf)); |
202 | p = buf; |
203 | if ((q = str_getword(&p)) != 0 && strcmp(q, "INFO") == 0) |
204 | goto again; |
205 | } |
206 | |
207 | /*----- That's all, folks -------------------------------------------------*/ |