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8efc0c15 | 1 | /* |
5260325f | 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. | |
2e73a022 | 7 | * |
8 | * SSH2 implementation, | |
9 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
5260325f | 10 | */ |
8efc0c15 | 11 | |
12 | #include "includes.h" | |
14a9a859 | 13 | RCSID("$OpenBSD: ssh-add.c,v 1.20 2000/08/28 03:50:54 deraadt Exp $"); |
8efc0c15 | 14 | |
2e73a022 | 15 | #include <openssl/evp.h> |
a306f2dd | 16 | #include <openssl/rsa.h> |
17 | #include <openssl/dsa.h> | |
18 | ||
8efc0c15 | 19 | #include "rsa.h" |
20 | #include "ssh.h" | |
21 | #include "xmalloc.h" | |
a306f2dd | 22 | #include "key.h" |
4c8722d9 | 23 | #include "authfd.h" |
a306f2dd | 24 | #include "authfile.h" |
8efc0c15 | 25 | |
f601d847 | 26 | #ifdef HAVE___PROGNAME |
27 | extern char *__progname; | |
28 | #else /* HAVE___PROGNAME */ | |
3fd95d9a | 29 | static const char *__progname = "ssh-add"; |
f601d847 | 30 | #endif /* HAVE___PROGNAME */ |
31 | ||
8efc0c15 | 32 | void |
5068f573 | 33 | delete_file(AuthenticationConnection *ac, const char *filename) |
8efc0c15 | 34 | { |
a306f2dd | 35 | Key *public; |
5260325f | 36 | char *comment; |
37 | ||
a306f2dd | 38 | public = key_new(KEY_RSA); |
39 | if (!load_public_key(filename, public, &comment)) { | |
5260325f | 40 | printf("Bad key file %s: %s\n", filename, strerror(errno)); |
41 | return; | |
42 | } | |
2e73a022 | 43 | if (ssh_remove_identity(ac, public)) |
5260325f | 44 | fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment); |
45 | else | |
46 | fprintf(stderr, "Could not remove identity: %s\n", filename); | |
a306f2dd | 47 | key_free(public); |
5260325f | 48 | xfree(comment); |
8efc0c15 | 49 | } |
50 | ||
2e73a022 | 51 | /* Send a request to remove all identities. */ |
8efc0c15 | 52 | void |
5068f573 | 53 | delete_all(AuthenticationConnection *ac) |
8efc0c15 | 54 | { |
2e73a022 | 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) | |
5260325f | 63 | fprintf(stderr, "All identities removed.\n"); |
64 | else | |
65 | fprintf(stderr, "Failed to remove all identitities.\n"); | |
8efc0c15 | 66 | } |
67 | ||
aa3378df | 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 | ||
8efc0c15 | 106 | void |
5068f573 | 107 | add_file(AuthenticationConnection *ac, const char *filename) |
8efc0c15 | 108 | { |
2e73a022 | 109 | struct stat st; |
a306f2dd | 110 | Key *public; |
111 | Key *private; | |
aa3378df | 112 | char *saved_comment, *comment, *askpass = NULL; |
113 | char buf[1024], msg[1024]; | |
5260325f | 114 | int success; |
aa3378df | 115 | int interactive = isatty(STDIN_FILENO); |
4c8722d9 | 116 | int type = KEY_RSA; |
5260325f | 117 | |
2e73a022 | 118 | if (stat(filename, &st) < 0) { |
119 | perror(filename); | |
120 | exit(1); | |
121 | } | |
4c8722d9 | 122 | /* |
123 | * try to load the public key. right now this only works for RSA, | |
124 | * since DSA keys are fully encrypted | |
125 | */ | |
a306f2dd | 126 | public = key_new(KEY_RSA); |
127 | if (!load_public_key(filename, public, &saved_comment)) { | |
4c8722d9 | 128 | /* ok, so we will asume this is a DSA key */ |
129 | type = KEY_DSA; | |
130 | saved_comment = xstrdup(filename); | |
5260325f | 131 | } |
a306f2dd | 132 | key_free(public); |
dad9a31e | 133 | |
57112b5a | 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 | } | |
aa3378df | 140 | |
5260325f | 141 | /* At first, try empty passphrase */ |
4c8722d9 | 142 | private = key_new(type); |
a306f2dd | 143 | success = load_private_key(filename, "", private, &comment); |
5260325f | 144 | if (!success) { |
aa3378df | 145 | printf("Need passphrase for %.200s\n", filename); |
146 | if (!interactive && askpass == NULL) { | |
147 | xfree(saved_comment); | |
148 | return; | |
5260325f | 149 | } |
aa3378df | 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 | } | |
5260325f | 159 | if (strcmp(pass, "") == 0) { |
160 | xfree(pass); | |
161 | xfree(saved_comment); | |
162 | return; | |
163 | } | |
a306f2dd | 164 | success = load_private_key(filename, pass, private, &comment); |
5260325f | 165 | memset(pass, 0, strlen(pass)); |
166 | xfree(pass); | |
167 | if (success) | |
168 | break; | |
aa3378df | 169 | strlcpy(msg, "Bad passphrase, try again", sizeof msg); |
5260325f | 170 | } |
171 | } | |
2e73a022 | 172 | xfree(comment); |
173 | if (ssh_add_identity(ac, private, saved_comment)) | |
174 | fprintf(stderr, "Identity added: %s (%s)\n", filename, saved_comment); | |
5260325f | 175 | else |
176 | fprintf(stderr, "Could not add identity: %s\n", filename); | |
a306f2dd | 177 | key_free(private); |
2e73a022 | 178 | xfree(saved_comment); |
8efc0c15 | 179 | } |
180 | ||
181 | void | |
f095fcc7 | 182 | list_identities(AuthenticationConnection *ac, int fp) |
8efc0c15 | 183 | { |
2e73a022 | 184 | Key *key; |
5260325f | 185 | char *comment; |
2e73a022 | 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); | |
5260325f | 197 | } else { |
2e73a022 | 198 | if (!key_write(key, stdout)) |
199 | fprintf(stderr, "key_write failed"); | |
200 | fprintf(stdout, " %s\n", comment); | |
5260325f | 201 | } |
2e73a022 | 202 | key_free(key); |
203 | xfree(comment); | |
5260325f | 204 | } |
f095fcc7 | 205 | } |
5260325f | 206 | if (!had_identities) |
207 | printf("The agent has no identities.\n"); | |
8efc0c15 | 208 | } |
209 | ||
210 | int | |
5068f573 | 211 | main(int argc, char **argv) |
8efc0c15 | 212 | { |
5260325f | 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 | ||
264dce47 | 220 | init_rng(); |
221 | ||
5260325f | 222 | /* check if RSA support exists */ |
223 | if (rsa_alive() == 0) { | |
5260325f | 224 | fprintf(stderr, |
225 | "%s: no RSA support in libssl and libcrypto. See ssl(8).\n", | |
226 | __progname); | |
227 | exit(1); | |
8efc0c15 | 228 | } |
2e73a022 | 229 | SSLeay_add_all_algorithms(); |
230 | ||
5260325f | 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); | |
8efc0c15 | 236 | } |
5260325f | 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]); | |
8efc0c15 | 259 | } |
5260325f | 260 | if (no_files) { |
261 | pw = getpwuid(getuid()); | |
262 | if (!pw) { | |
14a9a859 | 263 | fprintf(stderr, "No user found with uid %u\n", |
264 | (u_int)getuid()); | |
5260325f | 265 | ssh_close_authentication_connection(ac); |
266 | exit(1); | |
267 | } | |
268 | snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, SSH_CLIENT_IDENTITY); | |
269 | if (deleting) | |
270 | delete_file(ac, buf); | |
271 | else | |
272 | add_file(ac, buf); | |
8efc0c15 | 273 | } |
5260325f | 274 | ssh_close_authentication_connection(ac); |
275 | exit(0); | |
8efc0c15 | 276 | } |