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1 | /* | |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * Adds an identity to the authentication server, or removes an identity. | |
6 | * | |
7 | * As far as I am concerned, the code I have written for this software | |
8 | * can be used freely for any purpose. Any derived versions of this | |
9 | * software must be clearly marked as such, and if the derived work is | |
10 | * incompatible with the protocol description in the RFC file, it must be | |
11 | * called by a name other than "ssh" or "Secure Shell". | |
12 | * | |
13 | * SSH2 implementation, | |
14 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
15 | * | |
16 | * Redistribution and use in source and binary forms, with or without | |
17 | * modification, are permitted provided that the following conditions | |
18 | * are met: | |
19 | * 1. Redistributions of source code must retain the above copyright | |
20 | * notice, this list of conditions and the following disclaimer. | |
21 | * 2. Redistributions in binary form must reproduce the above copyright | |
22 | * notice, this list of conditions and the following disclaimer in the | |
23 | * documentation and/or other materials provided with the distribution. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
26 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
27 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
28 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
29 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
30 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
31 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
32 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
33 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
34 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
35 | */ | |
36 | ||
37 | #include "includes.h" | |
38 | RCSID("$OpenBSD: ssh-add.c,v 1.22 2000/09/07 20:27:54 deraadt Exp $"); | |
39 | ||
40 | #include <openssl/evp.h> | |
41 | #include <openssl/rsa.h> | |
42 | #include <openssl/dsa.h> | |
43 | ||
44 | #include "rsa.h" | |
45 | #include "ssh.h" | |
46 | #include "xmalloc.h" | |
47 | #include "key.h" | |
48 | #include "authfd.h" | |
49 | #include "authfile.h" | |
50 | ||
51 | #ifdef HAVE___PROGNAME | |
52 | extern char *__progname; | |
53 | #else /* HAVE___PROGNAME */ | |
54 | static const char *__progname = "ssh-add"; | |
55 | #endif /* HAVE___PROGNAME */ | |
56 | ||
57 | void | |
58 | delete_file(AuthenticationConnection *ac, const char *filename) | |
59 | { | |
60 | Key *public; | |
61 | char *comment; | |
62 | ||
63 | public = key_new(KEY_RSA); | |
64 | if (!load_public_key(filename, public, &comment)) { | |
65 | key_free(public); | |
66 | public = key_new(KEY_DSA); | |
67 | if (!try_load_public_key(filename, public, &comment)) { | |
68 | printf("Bad key file %s\n", filename); | |
69 | return; | |
70 | } | |
71 | } | |
72 | if (ssh_remove_identity(ac, public)) | |
73 | fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment); | |
74 | else | |
75 | fprintf(stderr, "Could not remove identity: %s\n", filename); | |
76 | key_free(public); | |
77 | xfree(comment); | |
78 | } | |
79 | ||
80 | /* Send a request to remove all identities. */ | |
81 | void | |
82 | delete_all(AuthenticationConnection *ac) | |
83 | { | |
84 | int success = 1; | |
85 | ||
86 | if (!ssh_remove_all_identities(ac, 1)) | |
87 | success = 0; | |
88 | /* ignore error-code for ssh2 */ | |
89 | ssh_remove_all_identities(ac, 2); | |
90 | ||
91 | if (success) | |
92 | fprintf(stderr, "All identities removed.\n"); | |
93 | else | |
94 | fprintf(stderr, "Failed to remove all identitities.\n"); | |
95 | } | |
96 | ||
97 | char * | |
98 | ssh_askpass(char *askpass, char *msg) | |
99 | { | |
100 | pid_t pid; | |
101 | size_t len; | |
102 | char *nl, *pass; | |
103 | int p[2], status; | |
104 | char buf[1024]; | |
105 | ||
106 | if (askpass == NULL) | |
107 | fatal("internal error: askpass undefined"); | |
108 | if (pipe(p) < 0) | |
109 | fatal("ssh_askpass: pipe: %s", strerror(errno)); | |
110 | if ((pid = fork()) < 0) | |
111 | fatal("ssh_askpass: fork: %s", strerror(errno)); | |
112 | if (pid == 0) { | |
113 | close(p[0]); | |
114 | if (dup2(p[1], STDOUT_FILENO) < 0) | |
115 | fatal("ssh_askpass: dup2: %s", strerror(errno)); | |
116 | execlp(askpass, askpass, msg, (char *) 0); | |
117 | fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno)); | |
118 | } | |
119 | close(p[1]); | |
120 | buf[0] = '\0'; | |
121 | atomicio(read, p[0], buf, sizeof buf); | |
122 | len = strlen(buf); | |
123 | close(p[0]); | |
124 | while (waitpid(pid, &status, 0) < 0) | |
125 | if (errno != EINTR) | |
126 | break; | |
127 | if (len <= 1) | |
128 | return xstrdup(""); | |
129 | nl = strchr(buf, '\n'); | |
130 | if (nl) | |
131 | *nl = '\0'; | |
132 | pass = xstrdup(buf); | |
133 | memset(buf, 0, sizeof(buf)); | |
134 | return pass; | |
135 | } | |
136 | ||
137 | void | |
138 | add_file(AuthenticationConnection *ac, const char *filename) | |
139 | { | |
140 | struct stat st; | |
141 | Key *public; | |
142 | Key *private; | |
143 | char *saved_comment, *comment, *askpass = NULL; | |
144 | char buf[1024], msg[1024]; | |
145 | int success; | |
146 | int interactive = isatty(STDIN_FILENO); | |
147 | int type = KEY_RSA; | |
148 | ||
149 | if (stat(filename, &st) < 0) { | |
150 | perror(filename); | |
151 | exit(1); | |
152 | } | |
153 | /* | |
154 | * try to load the public key. right now this only works for RSA, | |
155 | * since DSA keys are fully encrypted | |
156 | */ | |
157 | public = key_new(KEY_RSA); | |
158 | if (!load_public_key(filename, public, &saved_comment)) { | |
159 | /* ok, so we will asume this is a DSA key */ | |
160 | type = KEY_DSA; | |
161 | saved_comment = xstrdup(filename); | |
162 | } | |
163 | key_free(public); | |
164 | ||
165 | if (!interactive && getenv("DISPLAY")) { | |
166 | if (getenv(SSH_ASKPASS_ENV)) | |
167 | askpass = getenv(SSH_ASKPASS_ENV); | |
168 | else | |
169 | askpass = SSH_ASKPASS_DEFAULT; | |
170 | } | |
171 | ||
172 | /* At first, try empty passphrase */ | |
173 | private = key_new(type); | |
174 | success = load_private_key(filename, "", private, &comment); | |
175 | if (!success) { | |
176 | printf("Need passphrase for %.200s\n", filename); | |
177 | if (!interactive && askpass == NULL) { | |
178 | xfree(saved_comment); | |
179 | return; | |
180 | } | |
181 | snprintf(msg, sizeof msg, "Enter passphrase for %.200s", saved_comment); | |
182 | for (;;) { | |
183 | char *pass; | |
184 | if (interactive) { | |
185 | snprintf(buf, sizeof buf, "%s: ", msg); | |
186 | pass = read_passphrase(buf, 1); | |
187 | } else { | |
188 | pass = ssh_askpass(askpass, msg); | |
189 | } | |
190 | if (strcmp(pass, "") == 0) { | |
191 | xfree(pass); | |
192 | xfree(saved_comment); | |
193 | return; | |
194 | } | |
195 | success = load_private_key(filename, pass, private, &comment); | |
196 | memset(pass, 0, strlen(pass)); | |
197 | xfree(pass); | |
198 | if (success) | |
199 | break; | |
200 | strlcpy(msg, "Bad passphrase, try again", sizeof msg); | |
201 | } | |
202 | } | |
203 | xfree(comment); | |
204 | if (ssh_add_identity(ac, private, saved_comment)) | |
205 | fprintf(stderr, "Identity added: %s (%s)\n", filename, saved_comment); | |
206 | else | |
207 | fprintf(stderr, "Could not add identity: %s\n", filename); | |
208 | key_free(private); | |
209 | xfree(saved_comment); | |
210 | } | |
211 | ||
212 | void | |
213 | list_identities(AuthenticationConnection *ac, int fp) | |
214 | { | |
215 | Key *key; | |
216 | char *comment; | |
217 | int had_identities = 0; | |
218 | int version; | |
219 | ||
220 | for (version = 1; version <= 2; version++) { | |
221 | for (key = ssh_get_first_identity(ac, &comment, version); | |
222 | key != NULL; | |
223 | key = ssh_get_next_identity(ac, &comment, version)) { | |
224 | had_identities = 1; | |
225 | if (fp) { | |
226 | printf("%d %s %s\n", | |
227 | key_size(key), key_fingerprint(key), comment); | |
228 | } else { | |
229 | if (!key_write(key, stdout)) | |
230 | fprintf(stderr, "key_write failed"); | |
231 | fprintf(stdout, " %s\n", comment); | |
232 | } | |
233 | key_free(key); | |
234 | xfree(comment); | |
235 | } | |
236 | } | |
237 | if (!had_identities) | |
238 | printf("The agent has no identities.\n"); | |
239 | } | |
240 | ||
241 | int | |
242 | main(int argc, char **argv) | |
243 | { | |
244 | AuthenticationConnection *ac = NULL; | |
245 | struct passwd *pw; | |
246 | char buf[1024]; | |
247 | int no_files = 1; | |
248 | int i; | |
249 | int deleting = 0; | |
250 | ||
251 | init_rng(); | |
252 | ||
253 | /* check if RSA support exists */ | |
254 | if (rsa_alive() == 0) { | |
255 | fprintf(stderr, | |
256 | "%s: no RSA support in libssl and libcrypto. See ssl(8).\n", | |
257 | __progname); | |
258 | exit(1); | |
259 | } | |
260 | SSLeay_add_all_algorithms(); | |
261 | ||
262 | /* At first, get a connection to the authentication agent. */ | |
263 | ac = ssh_get_authentication_connection(); | |
264 | if (ac == NULL) { | |
265 | fprintf(stderr, "Could not open a connection to your authentication agent.\n"); | |
266 | exit(1); | |
267 | } | |
268 | for (i = 1; i < argc; i++) { | |
269 | if ((strcmp(argv[i], "-l") == 0) || | |
270 | (strcmp(argv[i], "-L") == 0)) { | |
271 | list_identities(ac, argv[i][1] == 'l' ? 1 : 0); | |
272 | /* Don't default-add/delete if -l. */ | |
273 | no_files = 0; | |
274 | continue; | |
275 | } | |
276 | if (strcmp(argv[i], "-d") == 0) { | |
277 | deleting = 1; | |
278 | continue; | |
279 | } | |
280 | if (strcmp(argv[i], "-D") == 0) { | |
281 | delete_all(ac); | |
282 | no_files = 0; | |
283 | continue; | |
284 | } | |
285 | no_files = 0; | |
286 | if (deleting) | |
287 | delete_file(ac, argv[i]); | |
288 | else | |
289 | add_file(ac, argv[i]); | |
290 | } | |
291 | if (no_files) { | |
292 | pw = getpwuid(getuid()); | |
293 | if (!pw) { | |
294 | fprintf(stderr, "No user found with uid %u\n", | |
295 | (u_int)getuid()); | |
296 | ssh_close_authentication_connection(ac); | |
297 | exit(1); | |
298 | } | |
299 | snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, SSH_CLIENT_IDENTITY); | |
300 | if (deleting) | |
301 | delete_file(ac, buf); | |
302 | else | |
303 | add_file(ac, buf); | |
304 | } | |
305 | ssh_close_authentication_connection(ac); | |
306 | exit(0); | |
307 | } |