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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 | ||
9 | #include "includes.h" | |
10 | RCSID("$OpenBSD: ssh-add.c,v 1.18 2000/07/16 08:27:21 markus Exp $"); | |
11 | ||
12 | #include <openssl/rsa.h> | |
13 | #include <openssl/dsa.h> | |
14 | ||
15 | #include "rsa.h" | |
16 | #include "ssh.h" | |
17 | #include "xmalloc.h" | |
18 | #include "fingerprint.h" | |
19 | #include "key.h" | |
20 | #include "authfd.h" | |
21 | #include "authfile.h" | |
22 | ||
23 | #ifdef HAVE___PROGNAME | |
24 | extern char *__progname; | |
25 | #else /* HAVE___PROGNAME */ | |
26 | static const char *__progname = "ssh-add"; | |
27 | #endif /* HAVE___PROGNAME */ | |
28 | ||
29 | void | |
30 | delete_file(AuthenticationConnection *ac, const char *filename) | |
31 | { | |
32 | Key *public; | |
33 | char *comment; | |
34 | ||
35 | public = key_new(KEY_RSA); | |
36 | if (!load_public_key(filename, public, &comment)) { | |
37 | printf("Bad key file %s: %s\n", filename, strerror(errno)); | |
38 | return; | |
39 | } | |
40 | if (ssh_remove_identity(ac, public->rsa)) | |
41 | fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment); | |
42 | else | |
43 | fprintf(stderr, "Could not remove identity: %s\n", filename); | |
44 | key_free(public); | |
45 | xfree(comment); | |
46 | } | |
47 | ||
48 | void | |
49 | delete_all(AuthenticationConnection *ac) | |
50 | { | |
51 | /* Send a request to remove all identities. */ | |
52 | if (ssh_remove_all_identities(ac)) | |
53 | fprintf(stderr, "All identities removed.\n"); | |
54 | else | |
55 | fprintf(stderr, "Failed to remove all identitities.\n"); | |
56 | } | |
57 | ||
58 | char * | |
59 | ssh_askpass(char *askpass, char *msg) | |
60 | { | |
61 | pid_t pid; | |
62 | size_t len; | |
63 | char *nl, *pass; | |
64 | int p[2], status; | |
65 | char buf[1024]; | |
66 | ||
67 | if (askpass == NULL) | |
68 | fatal("internal error: askpass undefined"); | |
69 | if (pipe(p) < 0) | |
70 | fatal("ssh_askpass: pipe: %s", strerror(errno)); | |
71 | if ((pid = fork()) < 0) | |
72 | fatal("ssh_askpass: fork: %s", strerror(errno)); | |
73 | if (pid == 0) { | |
74 | close(p[0]); | |
75 | if (dup2(p[1], STDOUT_FILENO) < 0) | |
76 | fatal("ssh_askpass: dup2: %s", strerror(errno)); | |
77 | execlp(askpass, askpass, msg, (char *) 0); | |
78 | fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno)); | |
79 | } | |
80 | close(p[1]); | |
81 | len = read(p[0], buf, sizeof buf); | |
82 | close(p[0]); | |
83 | while (waitpid(pid, &status, 0) < 0) | |
84 | if (errno != EINTR) | |
85 | break; | |
86 | if (len <= 1) | |
87 | return xstrdup(""); | |
88 | nl = strchr(buf, '\n'); | |
89 | if (nl) | |
90 | *nl = '\0'; | |
91 | pass = xstrdup(buf); | |
92 | memset(buf, 0, sizeof(buf)); | |
93 | return pass; | |
94 | } | |
95 | ||
96 | void | |
97 | add_file(AuthenticationConnection *ac, const char *filename) | |
98 | { | |
99 | Key *public; | |
100 | Key *private; | |
101 | char *saved_comment, *comment, *askpass = NULL; | |
102 | char buf[1024], msg[1024]; | |
103 | int success; | |
104 | int interactive = isatty(STDIN_FILENO); | |
105 | int type = KEY_RSA; | |
106 | ||
107 | /* | |
108 | * try to load the public key. right now this only works for RSA, | |
109 | * since DSA keys are fully encrypted | |
110 | */ | |
111 | public = key_new(KEY_RSA); | |
112 | if (!load_public_key(filename, public, &saved_comment)) { | |
113 | /* ok, so we will asume this is a DSA key */ | |
114 | type = KEY_DSA; | |
115 | saved_comment = xstrdup(filename); | |
116 | } | |
117 | key_free(public); | |
118 | ||
119 | if (!interactive && getenv("DISPLAY")) { | |
120 | if (getenv(SSH_ASKPASS_ENV)) | |
121 | askpass = getenv(SSH_ASKPASS_ENV); | |
122 | else | |
123 | askpass = SSH_ASKPASS_DEFAULT; | |
124 | } | |
125 | ||
126 | /* At first, try empty passphrase */ | |
127 | private = key_new(type); | |
128 | success = load_private_key(filename, "", private, &comment); | |
129 | if (!success) { | |
130 | printf("Need passphrase for %.200s\n", filename); | |
131 | if (!interactive && askpass == NULL) { | |
132 | xfree(saved_comment); | |
133 | return; | |
134 | } | |
135 | snprintf(msg, sizeof msg, "Enter passphrase for %.200s", saved_comment); | |
136 | for (;;) { | |
137 | char *pass; | |
138 | if (interactive) { | |
139 | snprintf(buf, sizeof buf, "%s: ", msg); | |
140 | pass = read_passphrase(buf, 1); | |
141 | } else { | |
142 | pass = ssh_askpass(askpass, msg); | |
143 | } | |
144 | if (strcmp(pass, "") == 0) { | |
145 | xfree(pass); | |
146 | xfree(saved_comment); | |
147 | return; | |
148 | } | |
149 | success = load_private_key(filename, pass, private, &comment); | |
150 | memset(pass, 0, strlen(pass)); | |
151 | xfree(pass); | |
152 | if (success) | |
153 | break; | |
154 | strlcpy(msg, "Bad passphrase, try again", sizeof msg); | |
155 | } | |
156 | } | |
157 | xfree(saved_comment); | |
158 | ||
159 | if (ssh_add_identity(ac, private, comment)) | |
160 | fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); | |
161 | else | |
162 | fprintf(stderr, "Could not add identity: %s\n", filename); | |
163 | key_free(private); | |
164 | xfree(comment); | |
165 | } | |
166 | ||
167 | void | |
168 | list_identities(AuthenticationConnection *ac, int fp) | |
169 | { | |
170 | BIGNUM *e, *n; | |
171 | int status; | |
172 | char *comment; | |
173 | int had_identities; | |
174 | ||
175 | e = BN_new(); | |
176 | n = BN_new(); | |
177 | had_identities = 0; | |
178 | for (status = ssh_get_first_identity(ac, e, n, &comment); | |
179 | status; | |
180 | status = ssh_get_next_identity(ac, e, n, &comment)) { | |
181 | unsigned int bits = BN_num_bits(n); | |
182 | had_identities = 1; | |
183 | if (fp) { | |
184 | printf("%d %s %s\n", bits, fingerprint(e, n), comment); | |
185 | } else { | |
186 | char *ebuf, *nbuf; | |
187 | ebuf = BN_bn2dec(e); | |
188 | if (ebuf == NULL) { | |
189 | error("list_identities: BN_bn2dec(e) failed."); | |
190 | } else { | |
191 | nbuf = BN_bn2dec(n); | |
192 | if (nbuf == NULL) { | |
193 | error("list_identities: BN_bn2dec(n) failed."); | |
194 | } else { | |
195 | printf("%d %s %s %s\n", bits, ebuf, nbuf, comment); | |
196 | free(nbuf); | |
197 | } | |
198 | free(ebuf); | |
199 | } | |
200 | } | |
201 | xfree(comment); | |
202 | } | |
203 | BN_clear_free(e); | |
204 | BN_clear_free(n); | |
205 | if (!had_identities) | |
206 | printf("The agent has no identities.\n"); | |
207 | } | |
208 | ||
209 | int | |
210 | main(int argc, char **argv) | |
211 | { | |
212 | AuthenticationConnection *ac = NULL; | |
213 | struct passwd *pw; | |
214 | char buf[1024]; | |
215 | int no_files = 1; | |
216 | int i; | |
217 | int deleting = 0; | |
218 | ||
219 | init_rng(); | |
220 | ||
221 | /* check if RSA support exists */ | |
222 | if (rsa_alive() == 0) { | |
223 | fprintf(stderr, | |
224 | "%s: no RSA support in libssl and libcrypto. See ssl(8).\n", | |
225 | __progname); | |
226 | exit(1); | |
227 | } | |
228 | /* At first, get a connection to the authentication agent. */ | |
229 | ac = ssh_get_authentication_connection(); | |
230 | if (ac == NULL) { | |
231 | fprintf(stderr, "Could not open a connection to your authentication agent.\n"); | |
232 | exit(1); | |
233 | } | |
234 | for (i = 1; i < argc; i++) { | |
235 | if ((strcmp(argv[i], "-l") == 0) || | |
236 | (strcmp(argv[i], "-L") == 0)) { | |
237 | list_identities(ac, argv[i][1] == 'l' ? 1 : 0); | |
238 | /* Don't default-add/delete if -l. */ | |
239 | no_files = 0; | |
240 | continue; | |
241 | } | |
242 | if (strcmp(argv[i], "-d") == 0) { | |
243 | deleting = 1; | |
244 | continue; | |
245 | } | |
246 | if (strcmp(argv[i], "-D") == 0) { | |
247 | delete_all(ac); | |
248 | no_files = 0; | |
249 | continue; | |
250 | } | |
251 | no_files = 0; | |
252 | if (deleting) | |
253 | delete_file(ac, argv[i]); | |
254 | else | |
255 | add_file(ac, argv[i]); | |
256 | } | |
257 | if (no_files) { | |
258 | pw = getpwuid(getuid()); | |
259 | if (!pw) { | |
260 | fprintf(stderr, "No user found with uid %d\n", (int) getuid()); | |
261 | ssh_close_authentication_connection(ac); | |
262 | exit(1); | |
263 | } | |
264 | snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, SSH_CLIENT_IDENTITY); | |
265 | if (deleting) | |
266 | delete_file(ac, buf); | |
267 | else | |
268 | add_file(ac, buf); | |
269 | } | |
270 | ssh_close_authentication_connection(ac); | |
271 | exit(0); | |
272 | } |