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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 | * Created: Thu Apr 6 00:52:24 1995 ylo | |
6 | * Adds an identity to the authentication server, or removes an identity. | |
7 | * | |
8 | * SSH2 implementation, | |
9 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
10 | */ | |
11 | ||
12 | #include "includes.h" | |
13 | RCSID("$OpenBSD: ssh-add.c,v 1.19 2000/08/19 21:34:43 markus Exp $"); | |
14 | ||
15 | #include <openssl/evp.h> | |
16 | #include <openssl/rsa.h> | |
17 | #include <openssl/dsa.h> | |
18 | ||
19 | #include "rsa.h" | |
20 | #include "ssh.h" | |
21 | #include "xmalloc.h" | |
22 | #include "key.h" | |
23 | #include "authfd.h" | |
24 | #include "authfile.h" | |
25 | ||
26 | #ifdef HAVE___PROGNAME | |
27 | extern char *__progname; | |
28 | #else /* HAVE___PROGNAME */ | |
29 | static const char *__progname = "ssh-add"; | |
30 | #endif /* HAVE___PROGNAME */ | |
31 | ||
32 | void | |
33 | delete_file(AuthenticationConnection *ac, const char *filename) | |
34 | { | |
35 | Key *public; | |
36 | char *comment; | |
37 | ||
38 | public = key_new(KEY_RSA); | |
39 | if (!load_public_key(filename, public, &comment)) { | |
40 | printf("Bad key file %s: %s\n", filename, strerror(errno)); | |
41 | return; | |
42 | } | |
43 | if (ssh_remove_identity(ac, public)) | |
44 | fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment); | |
45 | else | |
46 | fprintf(stderr, "Could not remove identity: %s\n", filename); | |
47 | key_free(public); | |
48 | xfree(comment); | |
49 | } | |
50 | ||
51 | /* Send a request to remove all identities. */ | |
52 | void | |
53 | delete_all(AuthenticationConnection *ac) | |
54 | { | |
55 | int success = 1; | |
56 | ||
57 | if (!ssh_remove_all_identities(ac, 1)) | |
58 | success = 0; | |
59 | /* ignore error-code for ssh2 */ | |
60 | ssh_remove_all_identities(ac, 2); | |
61 | ||
62 | if (success) | |
63 | fprintf(stderr, "All identities removed.\n"); | |
64 | else | |
65 | fprintf(stderr, "Failed to remove all identitities.\n"); | |
66 | } | |
67 | ||
68 | char * | |
69 | ssh_askpass(char *askpass, char *msg) | |
70 | { | |
71 | pid_t pid; | |
72 | size_t len; | |
73 | char *nl, *pass; | |
74 | int p[2], status; | |
75 | char buf[1024]; | |
76 | ||
77 | if (askpass == NULL) | |
78 | fatal("internal error: askpass undefined"); | |
79 | if (pipe(p) < 0) | |
80 | fatal("ssh_askpass: pipe: %s", strerror(errno)); | |
81 | if ((pid = fork()) < 0) | |
82 | fatal("ssh_askpass: fork: %s", strerror(errno)); | |
83 | if (pid == 0) { | |
84 | close(p[0]); | |
85 | if (dup2(p[1], STDOUT_FILENO) < 0) | |
86 | fatal("ssh_askpass: dup2: %s", strerror(errno)); | |
87 | execlp(askpass, askpass, msg, (char *) 0); | |
88 | fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno)); | |
89 | } | |
90 | close(p[1]); | |
91 | len = read(p[0], buf, sizeof buf); | |
92 | close(p[0]); | |
93 | while (waitpid(pid, &status, 0) < 0) | |
94 | if (errno != EINTR) | |
95 | break; | |
96 | if (len <= 1) | |
97 | return xstrdup(""); | |
98 | nl = strchr(buf, '\n'); | |
99 | if (nl) | |
100 | *nl = '\0'; | |
101 | pass = xstrdup(buf); | |
102 | memset(buf, 0, sizeof(buf)); | |
103 | return pass; | |
104 | } | |
105 | ||
106 | void | |
107 | add_file(AuthenticationConnection *ac, const char *filename) | |
108 | { | |
109 | struct stat st; | |
110 | Key *public; | |
111 | Key *private; | |
112 | char *saved_comment, *comment, *askpass = NULL; | |
113 | char buf[1024], msg[1024]; | |
114 | int success; | |
115 | int interactive = isatty(STDIN_FILENO); | |
116 | int type = KEY_RSA; | |
117 | ||
118 | if (stat(filename, &st) < 0) { | |
119 | perror(filename); | |
120 | exit(1); | |
121 | } | |
122 | /* | |
123 | * try to load the public key. right now this only works for RSA, | |
124 | * since DSA keys are fully encrypted | |
125 | */ | |
126 | public = key_new(KEY_RSA); | |
127 | if (!load_public_key(filename, public, &saved_comment)) { | |
128 | /* ok, so we will asume this is a DSA key */ | |
129 | type = KEY_DSA; | |
130 | saved_comment = xstrdup(filename); | |
131 | } | |
132 | key_free(public); | |
133 | ||
134 | if (!interactive && getenv("DISPLAY")) { | |
135 | if (getenv(SSH_ASKPASS_ENV)) | |
136 | askpass = getenv(SSH_ASKPASS_ENV); | |
137 | else | |
138 | askpass = SSH_ASKPASS_DEFAULT; | |
139 | } | |
140 | ||
141 | /* At first, try empty passphrase */ | |
142 | private = key_new(type); | |
143 | success = load_private_key(filename, "", private, &comment); | |
144 | if (!success) { | |
145 | printf("Need passphrase for %.200s\n", filename); | |
146 | if (!interactive && askpass == NULL) { | |
147 | xfree(saved_comment); | |
148 | return; | |
149 | } | |
150 | snprintf(msg, sizeof msg, "Enter passphrase for %.200s", saved_comment); | |
151 | for (;;) { | |
152 | char *pass; | |
153 | if (interactive) { | |
154 | snprintf(buf, sizeof buf, "%s: ", msg); | |
155 | pass = read_passphrase(buf, 1); | |
156 | } else { | |
157 | pass = ssh_askpass(askpass, msg); | |
158 | } | |
159 | if (strcmp(pass, "") == 0) { | |
160 | xfree(pass); | |
161 | xfree(saved_comment); | |
162 | return; | |
163 | } | |
164 | success = load_private_key(filename, pass, private, &comment); | |
165 | memset(pass, 0, strlen(pass)); | |
166 | xfree(pass); | |
167 | if (success) | |
168 | break; | |
169 | strlcpy(msg, "Bad passphrase, try again", sizeof msg); | |
170 | } | |
171 | } | |
172 | xfree(comment); | |
173 | if (ssh_add_identity(ac, private, saved_comment)) | |
174 | fprintf(stderr, "Identity added: %s (%s)\n", filename, saved_comment); | |
175 | else | |
176 | fprintf(stderr, "Could not add identity: %s\n", filename); | |
177 | key_free(private); | |
178 | xfree(saved_comment); | |
179 | } | |
180 | ||
181 | void | |
182 | list_identities(AuthenticationConnection *ac, int fp) | |
183 | { | |
184 | Key *key; | |
185 | char *comment; | |
186 | int had_identities = 0; | |
187 | int version; | |
188 | ||
189 | for (version = 1; version <= 2; version++) { | |
190 | for (key = ssh_get_first_identity(ac, &comment, version); | |
191 | key != NULL; | |
192 | key = ssh_get_next_identity(ac, &comment, version)) { | |
193 | had_identities = 1; | |
194 | if (fp) { | |
195 | printf("%d %s %s\n", | |
196 | key_size(key), key_fingerprint(key), comment); | |
197 | } else { | |
198 | if (!key_write(key, stdout)) | |
199 | fprintf(stderr, "key_write failed"); | |
200 | fprintf(stdout, " %s\n", comment); | |
201 | } | |
202 | key_free(key); | |
203 | xfree(comment); | |
204 | } | |
205 | } | |
206 | if (!had_identities) | |
207 | printf("The agent has no identities.\n"); | |
208 | } | |
209 | ||
210 | int | |
211 | main(int argc, char **argv) | |
212 | { | |
213 | AuthenticationConnection *ac = NULL; | |
214 | struct passwd *pw; | |
215 | char buf[1024]; | |
216 | int no_files = 1; | |
217 | int i; | |
218 | int deleting = 0; | |
219 | ||
220 | init_rng(); | |
221 | ||
222 | /* check if RSA support exists */ | |
223 | if (rsa_alive() == 0) { | |
224 | fprintf(stderr, | |
225 | "%s: no RSA support in libssl and libcrypto. See ssl(8).\n", | |
226 | __progname); | |
227 | exit(1); | |
228 | } | |
229 | SSLeay_add_all_algorithms(); | |
230 | ||
231 | /* At first, get a connection to the authentication agent. */ | |
232 | ac = ssh_get_authentication_connection(); | |
233 | if (ac == NULL) { | |
234 | fprintf(stderr, "Could not open a connection to your authentication agent.\n"); | |
235 | exit(1); | |
236 | } | |
237 | for (i = 1; i < argc; i++) { | |
238 | if ((strcmp(argv[i], "-l") == 0) || | |
239 | (strcmp(argv[i], "-L") == 0)) { | |
240 | list_identities(ac, argv[i][1] == 'l' ? 1 : 0); | |
241 | /* Don't default-add/delete if -l. */ | |
242 | no_files = 0; | |
243 | continue; | |
244 | } | |
245 | if (strcmp(argv[i], "-d") == 0) { | |
246 | deleting = 1; | |
247 | continue; | |
248 | } | |
249 | if (strcmp(argv[i], "-D") == 0) { | |
250 | delete_all(ac); | |
251 | no_files = 0; | |
252 | continue; | |
253 | } | |
254 | no_files = 0; | |
255 | if (deleting) | |
256 | delete_file(ac, argv[i]); | |
257 | else | |
258 | add_file(ac, argv[i]); | |
259 | } | |
260 | if (no_files) { | |
261 | pw = getpwuid(getuid()); | |
262 | if (!pw) { | |
263 | fprintf(stderr, "No user found with uid %d\n", (int) getuid()); | |
264 | ssh_close_authentication_connection(ac); | |
265 | exit(1); | |
266 | } | |
267 | snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, SSH_CLIENT_IDENTITY); | |
268 | if (deleting) | |
269 | delete_file(ac, buf); | |
270 | else | |
271 | add_file(ac, buf); | |
272 | } | |
273 | ssh_close_authentication_connection(ac); | |
274 | exit(0); | |
275 | } |