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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. | |
7 | */ | |
8efc0c15 | 8 | |
9 | #include "includes.h" | |
74fc9186 | 10 | RCSID("$OpenBSD: ssh-add.c,v 1.17 2000/06/20 01:39:44 markus Exp $"); |
8efc0c15 | 11 | |
a306f2dd | 12 | #include <openssl/rsa.h> |
13 | #include <openssl/dsa.h> | |
14 | ||
8efc0c15 | 15 | #include "rsa.h" |
16 | #include "ssh.h" | |
17 | #include "xmalloc.h" | |
18 | #include "authfd.h" | |
f095fcc7 | 19 | #include "fingerprint.h" |
a306f2dd | 20 | #include "key.h" |
21 | #include "authfile.h" | |
8efc0c15 | 22 | |
f601d847 | 23 | #ifdef HAVE___PROGNAME |
24 | extern char *__progname; | |
25 | #else /* HAVE___PROGNAME */ | |
3fd95d9a | 26 | static const char *__progname = "ssh-add"; |
f601d847 | 27 | #endif /* HAVE___PROGNAME */ |
28 | ||
8efc0c15 | 29 | void |
5068f573 | 30 | delete_file(AuthenticationConnection *ac, const char *filename) |
8efc0c15 | 31 | { |
a306f2dd | 32 | Key *public; |
5260325f | 33 | char *comment; |
34 | ||
a306f2dd | 35 | public = key_new(KEY_RSA); |
36 | if (!load_public_key(filename, public, &comment)) { | |
5260325f | 37 | printf("Bad key file %s: %s\n", filename, strerror(errno)); |
38 | return; | |
39 | } | |
a306f2dd | 40 | if (ssh_remove_identity(ac, public->rsa)) |
5260325f | 41 | fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment); |
42 | else | |
43 | fprintf(stderr, "Could not remove identity: %s\n", filename); | |
a306f2dd | 44 | key_free(public); |
5260325f | 45 | xfree(comment); |
8efc0c15 | 46 | } |
47 | ||
48 | void | |
5068f573 | 49 | delete_all(AuthenticationConnection *ac) |
8efc0c15 | 50 | { |
5260325f | 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"); | |
8efc0c15 | 56 | } |
57 | ||
aa3378df | 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 | ||
8efc0c15 | 96 | void |
5068f573 | 97 | add_file(AuthenticationConnection *ac, const char *filename) |
8efc0c15 | 98 | { |
a306f2dd | 99 | Key *public; |
100 | Key *private; | |
aa3378df | 101 | char *saved_comment, *comment, *askpass = NULL; |
102 | char buf[1024], msg[1024]; | |
5260325f | 103 | int success; |
aa3378df | 104 | int interactive = isatty(STDIN_FILENO); |
5260325f | 105 | |
a306f2dd | 106 | public = key_new(KEY_RSA); |
107 | if (!load_public_key(filename, public, &saved_comment)) { | |
5260325f | 108 | printf("Bad key file %s: %s\n", filename, strerror(errno)); |
109 | return; | |
110 | } | |
a306f2dd | 111 | key_free(public); |
dad9a31e | 112 | |
57112b5a | 113 | if (!interactive && getenv("DISPLAY")) { |
114 | if (getenv(SSH_ASKPASS_ENV)) | |
115 | askpass = getenv(SSH_ASKPASS_ENV); | |
116 | else | |
117 | askpass = SSH_ASKPASS_DEFAULT; | |
118 | } | |
aa3378df | 119 | |
5260325f | 120 | /* At first, try empty passphrase */ |
a306f2dd | 121 | private = key_new(KEY_RSA); |
122 | success = load_private_key(filename, "", private, &comment); | |
5260325f | 123 | if (!success) { |
aa3378df | 124 | printf("Need passphrase for %.200s\n", filename); |
125 | if (!interactive && askpass == NULL) { | |
126 | xfree(saved_comment); | |
127 | return; | |
5260325f | 128 | } |
aa3378df | 129 | snprintf(msg, sizeof msg, "Enter passphrase for %.200s", saved_comment); |
130 | for (;;) { | |
131 | char *pass; | |
132 | if (interactive) { | |
133 | snprintf(buf, sizeof buf, "%s: ", msg); | |
134 | pass = read_passphrase(buf, 1); | |
135 | } else { | |
136 | pass = ssh_askpass(askpass, msg); | |
137 | } | |
5260325f | 138 | if (strcmp(pass, "") == 0) { |
139 | xfree(pass); | |
140 | xfree(saved_comment); | |
141 | return; | |
142 | } | |
a306f2dd | 143 | success = load_private_key(filename, pass, private, &comment); |
5260325f | 144 | memset(pass, 0, strlen(pass)); |
145 | xfree(pass); | |
146 | if (success) | |
147 | break; | |
aa3378df | 148 | strlcpy(msg, "Bad passphrase, try again", sizeof msg); |
5260325f | 149 | } |
150 | } | |
151 | xfree(saved_comment); | |
152 | ||
a306f2dd | 153 | if (ssh_add_identity(ac, private->rsa, comment)) |
5260325f | 154 | fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); |
155 | else | |
156 | fprintf(stderr, "Could not add identity: %s\n", filename); | |
a306f2dd | 157 | key_free(private); |
5260325f | 158 | xfree(comment); |
8efc0c15 | 159 | } |
160 | ||
161 | void | |
f095fcc7 | 162 | list_identities(AuthenticationConnection *ac, int fp) |
8efc0c15 | 163 | { |
5260325f | 164 | BIGNUM *e, *n; |
165 | int status; | |
166 | char *comment; | |
167 | int had_identities; | |
168 | ||
169 | e = BN_new(); | |
170 | n = BN_new(); | |
171 | had_identities = 0; | |
172 | for (status = ssh_get_first_identity(ac, e, n, &comment); | |
173 | status; | |
174 | status = ssh_get_next_identity(ac, e, n, &comment)) { | |
175 | unsigned int bits = BN_num_bits(n); | |
176 | had_identities = 1; | |
177 | if (fp) { | |
178 | printf("%d %s %s\n", bits, fingerprint(e, n), comment); | |
179 | } else { | |
180 | char *ebuf, *nbuf; | |
181 | ebuf = BN_bn2dec(e); | |
182 | if (ebuf == NULL) { | |
183 | error("list_identities: BN_bn2dec(e) failed."); | |
184 | } else { | |
185 | nbuf = BN_bn2dec(n); | |
186 | if (nbuf == NULL) { | |
187 | error("list_identities: BN_bn2dec(n) failed."); | |
188 | } else { | |
189 | printf("%d %s %s %s\n", bits, ebuf, nbuf, comment); | |
190 | free(nbuf); | |
191 | } | |
192 | free(ebuf); | |
193 | } | |
194 | } | |
195 | xfree(comment); | |
f095fcc7 | 196 | } |
5260325f | 197 | BN_clear_free(e); |
198 | BN_clear_free(n); | |
199 | if (!had_identities) | |
200 | printf("The agent has no identities.\n"); | |
8efc0c15 | 201 | } |
202 | ||
203 | int | |
5068f573 | 204 | main(int argc, char **argv) |
8efc0c15 | 205 | { |
5260325f | 206 | AuthenticationConnection *ac = NULL; |
207 | struct passwd *pw; | |
208 | char buf[1024]; | |
209 | int no_files = 1; | |
210 | int i; | |
211 | int deleting = 0; | |
212 | ||
213 | /* check if RSA support exists */ | |
214 | if (rsa_alive() == 0) { | |
5260325f | 215 | fprintf(stderr, |
216 | "%s: no RSA support in libssl and libcrypto. See ssl(8).\n", | |
217 | __progname); | |
218 | exit(1); | |
8efc0c15 | 219 | } |
5260325f | 220 | /* At first, get a connection to the authentication agent. */ |
221 | ac = ssh_get_authentication_connection(); | |
222 | if (ac == NULL) { | |
223 | fprintf(stderr, "Could not open a connection to your authentication agent.\n"); | |
224 | exit(1); | |
8efc0c15 | 225 | } |
5260325f | 226 | for (i = 1; i < argc; i++) { |
227 | if ((strcmp(argv[i], "-l") == 0) || | |
228 | (strcmp(argv[i], "-L") == 0)) { | |
229 | list_identities(ac, argv[i][1] == 'l' ? 1 : 0); | |
230 | /* Don't default-add/delete if -l. */ | |
231 | no_files = 0; | |
232 | continue; | |
233 | } | |
234 | if (strcmp(argv[i], "-d") == 0) { | |
235 | deleting = 1; | |
236 | continue; | |
237 | } | |
238 | if (strcmp(argv[i], "-D") == 0) { | |
239 | delete_all(ac); | |
240 | no_files = 0; | |
241 | continue; | |
242 | } | |
243 | no_files = 0; | |
244 | if (deleting) | |
245 | delete_file(ac, argv[i]); | |
246 | else | |
247 | add_file(ac, argv[i]); | |
8efc0c15 | 248 | } |
5260325f | 249 | if (no_files) { |
250 | pw = getpwuid(getuid()); | |
251 | if (!pw) { | |
252 | fprintf(stderr, "No user found with uid %d\n", (int) getuid()); | |
253 | ssh_close_authentication_connection(ac); | |
254 | exit(1); | |
255 | } | |
256 | snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, SSH_CLIENT_IDENTITY); | |
257 | if (deleting) | |
258 | delete_file(ac, buf); | |
259 | else | |
260 | add_file(ac, buf); | |
8efc0c15 | 261 | } |
5260325f | 262 | ssh_close_authentication_connection(ac); |
263 | exit(0); | |
8efc0c15 | 264 | } |