069c185c |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: pixie-common.c,v 1.1 1999/12/22 15:58:41 mdw Exp $ |
4 | * |
5 | * Common code for Pixie client and server (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: pixie-common.c,v $ |
33 | * Revision 1.1 1999/12/22 15:58:41 mdw |
34 | * Passphrase pixie support. |
35 | * |
36 | */ |
37 | |
38 | /*----- Header files ------------------------------------------------------*/ |
39 | |
40 | #include <errno.h> |
41 | #include <stddef.h> |
42 | #include <stdio.h> |
43 | #include <stdlib.h> |
44 | #include <string.h> |
45 | |
46 | #include <sys/types.h> |
47 | #include <unistd.h> |
48 | #include <fcntl.h> |
49 | #include <termios.h> |
50 | #include <pwd.h> |
51 | |
52 | #include <sys/socket.h> |
53 | #include <sys/un.h> |
54 | |
55 | #include <mLib/alloc.h> |
56 | #include <mLib/dstr.h> |
57 | |
58 | #include "pixie.h" |
59 | |
60 | /*----- Main code ---------------------------------------------------------*/ |
61 | |
62 | /* --- @pixie_address@ --- * |
63 | * |
64 | * Arguments: @const char *sock@ = pointer to socket name |
65 | * @size_t *psz@ = where to write the address size |
66 | * |
67 | * Returns: Pointer to filled-in Unix-domain socket address. |
68 | * |
69 | * Use: Returns a Unix-domain socket address to use to find the |
70 | * passphrase pixie. |
71 | */ |
72 | |
73 | struct sockaddr_un *pixie_address(const char *sock, size_t *psz) |
74 | { |
75 | dstr d = DSTR_INIT; |
76 | |
77 | /* --- Get the default socket path if none specified --- */ |
78 | |
79 | if (!sock) |
80 | sock = getenv("CATACOMB_PIXIE_SOCKET"); |
81 | if (!sock) |
82 | sock = "%h/.catacomb/pixie"; |
83 | |
84 | /* --- Substitute interesting sequences in the path --- */ |
85 | |
86 | { |
87 | const char *q, *qq; |
88 | |
89 | q = sock; |
90 | for (;;) { |
91 | qq = strchr(q, '%'); |
92 | if (!qq || !qq[1]) { |
93 | DPUTS(&d, q); |
94 | break; |
95 | } |
96 | DPUTM(&d, q, qq - q); |
97 | q = qq + 1; |
98 | switch (*q) { |
99 | case 'u': |
100 | qq = getenv("USER"); |
101 | if (!qq) |
102 | qq = getenv("LOGNAME"); |
103 | if (!qq) { |
104 | struct passwd *pw = getpwuid(getuid()); |
105 | if (pw) |
106 | qq = pw->pw_name; |
107 | else |
108 | qq = "<unknown>"; |
109 | } |
110 | DPUTS(&d, qq); |
111 | break; |
112 | case 'h': |
113 | qq = getenv("HOME"); |
114 | if (!qq) { |
115 | struct passwd *pw = getpwuid(getuid()); |
116 | if (pw) |
117 | qq = pw->pw_dir; |
118 | else |
119 | qq = "<unknown>"; |
120 | } |
121 | DPUTS(&d, qq); |
122 | break; |
123 | default: |
124 | DPUTC(&d, '%'); |
125 | DPUTC(&d, *q); |
126 | break; |
127 | } |
128 | q++; |
129 | } |
130 | DPUTZ(&d); |
131 | } |
132 | |
133 | /* --- Allocate and initialize the socket address --- */ |
134 | |
135 | { |
136 | struct sockaddr_un *sun; |
137 | size_t bsz = offsetof(struct sockaddr_un, sun_path); |
138 | *psz = bsz + d.len + 1; |
139 | sun = xmalloc(bsz + d.len + 1); |
140 | memset(sun, 0, bsz); |
141 | sun->sun_family = AF_UNIX; |
142 | memcpy(sun->sun_path, d.buf, d.len + 1); |
143 | dstr_destroy(&d); |
144 | return (sun); |
145 | } |
146 | } |
147 | |
148 | /* --- @pixie_fdline@ --- * |
149 | * |
150 | * Arguments: @int fd@ = file descriptor to read from |
151 | * @char *buf@ = pointer to buffer |
152 | * @size_t sz@ = size of buffer |
153 | * |
154 | * Returns: --- |
155 | * |
156 | * Use: Reads a line from a file descriptor. The read is done one |
157 | * character at a time. If the entire line won't fit, the end |
158 | * is truncated. The line is null terminated. |
159 | */ |
160 | |
161 | void pixie_fdline(int fd, char *buf, size_t sz) |
162 | { |
163 | char *p = buf; |
164 | char *q = p + sz - 1; |
165 | |
166 | for (;;) { |
167 | char c; |
168 | if (read(fd, &c, 1) < 1) |
169 | break; |
170 | if (c == '\n') |
171 | break; |
172 | if (p < q) |
173 | *p++ = c; |
174 | } |
175 | *p = 0; |
176 | } |
177 | |
178 | /* --- @pixie_getpass@ --- * |
179 | * |
180 | * Arguments: @const char *prompt@ = pointer to prompt string |
181 | * @char *buf@ = pointer to buffer |
182 | * @size_t sz@ = size of buffer |
183 | * |
184 | * Returns: Zero if it worked OK, nonzero otherwise. |
185 | * |
186 | * Use: Reads a passphrase from the terminal or some other requested |
187 | * source. |
188 | */ |
189 | |
190 | int pixie_getpass(const char *prompt, char *buf, size_t sz) |
191 | { |
192 | const char *pfd = getenv("CATACOMB_PASSPHRASE_FD"); |
193 | int fd = 0; |
194 | |
195 | /* --- See whether a terminal is what's wanted --- */ |
196 | |
197 | if (pfd) { |
198 | fd = atoi(pfd); |
199 | pixie_fdline(fd, buf, sz); |
200 | } else { |
201 | struct termios ta; |
202 | struct termios ota; |
203 | char nl = '\n'; |
204 | |
205 | if ((fd = open("/dev/tty", O_RDWR)) < 0) |
206 | goto fail_0; |
207 | if (tcgetattr(fd, &ta) < 0) |
208 | goto fail_1; |
209 | ota = ta; |
210 | ta.c_lflag &= ~(ECHO | ISIG); |
211 | if (tcsetattr(fd, TCSAFLUSH, &ta)) |
212 | goto fail_1; |
213 | write(fd, prompt, strlen(prompt)); |
214 | pixie_fdline(fd, buf, sz); |
215 | tcsetattr(fd, TCSAFLUSH, &ota); |
216 | write(fd, &nl, 1); |
217 | close(fd); |
218 | } |
219 | return (0); |
220 | |
221 | /* --- Tidy up if things went wrong --- */ |
222 | |
223 | fail_1: |
224 | close(fd); |
225 | fail_0: |
226 | return (-1); |
227 | } |
228 | |
229 | |
230 | /*----- That's all, folks -------------------------------------------------*/ |
231 | |