| /* $OpenBSD: ssh-keygen.c,v 1.158 2007/01/03 03:01:40 stevesk Exp $ */ |
| /* |
| * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| * All rights reserved |
| * Identity and host key generation and maintenance. |
| * |
| * As far as I am concerned, the code I have written for this software |
| * can be used freely for any purpose. Any derived versions of this |
| * software must be clearly marked as such, and if the derived work is |
| * incompatible with the protocol description in the RFC file, it must be |
| * called by a name other than "ssh" or "Secure Shell". |
| */ |
| |
| #include "includes.h" |
| |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #include <sys/stat.h> |
| #include <sys/param.h> |
| |
| #include <openssl/evp.h> |
| #include <openssl/pem.h> |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <netdb.h> |
| #ifdef HAVE_PATHS_H |
| # include <paths.h> |
| #endif |
| #include <pwd.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include "xmalloc.h" |
| #include "key.h" |
| #include "rsa.h" |
| #include "authfile.h" |
| #include "uuencode.h" |
| #include "buffer.h" |
| #include "pathnames.h" |
| #include "log.h" |
| #include "misc.h" |
| #include "match.h" |
| #include "hostfile.h" |
| #include "dns.h" |
| |
| #ifdef SMARTCARD |
| #include "scard.h" |
| #endif |
| |
| /* Number of bits in the RSA/DSA key. This value can be set on the command line. */ |
| #define DEFAULT_BITS 2048 |
| #define DEFAULT_BITS_DSA 1024 |
| u_int32_t bits = 0; |
| |
| /* |
| * Flag indicating that we just want to change the passphrase. This can be |
| * set on the command line. |
| */ |
| int change_passphrase = 0; |
| |
| /* |
| * Flag indicating that we just want to change the comment. This can be set |
| * on the command line. |
| */ |
| int change_comment = 0; |
| |
| int quiet = 0; |
| |
| /* Flag indicating that we want to hash a known_hosts file */ |
| int hash_hosts = 0; |
| /* Flag indicating that we want lookup a host in known_hosts file */ |
| int find_host = 0; |
| /* Flag indicating that we want to delete a host from a known_hosts file */ |
| int delete_host = 0; |
| |
| /* Flag indicating that we just want to see the key fingerprint */ |
| int print_fingerprint = 0; |
| int print_bubblebabble = 0; |
| |
| /* The identity file name, given on the command line or entered by the user. */ |
| char identity_file[1024]; |
| int have_identity = 0; |
| |
| /* This is set to the passphrase if given on the command line. */ |
| char *identity_passphrase = NULL; |
| |
| /* This is set to the new passphrase if given on the command line. */ |
| char *identity_new_passphrase = NULL; |
| |
| /* This is set to the new comment if given on the command line. */ |
| char *identity_comment = NULL; |
| |
| /* Dump public key file in format used by real and the original SSH 2 */ |
| int convert_to_ssh2 = 0; |
| int convert_from_ssh2 = 0; |
| int print_public = 0; |
| int print_generic = 0; |
| |
| char *key_type_name = NULL; |
| |
| /* argv0 */ |
| extern char *__progname; |
| |
| char hostname[MAXHOSTNAMELEN]; |
| |
| /* moduli.c */ |
| int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); |
| int prime_test(FILE *, FILE *, u_int32_t, u_int32_t); |
| |
| static void |
| ask_filename(struct passwd *pw, const char *prompt) |
| { |
| char buf[1024]; |
| char *name = NULL; |
| |
| if (key_type_name == NULL) |
| name = _PATH_SSH_CLIENT_ID_RSA; |
| else { |
| switch (key_type_from_name(key_type_name)) { |
| case KEY_RSA1: |
| name = _PATH_SSH_CLIENT_IDENTITY; |
| break; |
| case KEY_DSA: |
| name = _PATH_SSH_CLIENT_ID_DSA; |
| break; |
| case KEY_RSA: |
| name = _PATH_SSH_CLIENT_ID_RSA; |
| break; |
| default: |
| fprintf(stderr, "bad key type"); |
| exit(1); |
| break; |
| } |
| } |
| snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); |
| fprintf(stderr, "%s (%s): ", prompt, identity_file); |
| if (fgets(buf, sizeof(buf), stdin) == NULL) |
| exit(1); |
| if (strchr(buf, '\n')) |
| *strchr(buf, '\n') = 0; |
| if (strcmp(buf, "") != 0) |
| strlcpy(identity_file, buf, sizeof(identity_file)); |
| have_identity = 1; |
| } |
| |
| static Key * |
| load_identity(char *filename) |
| { |
| char *pass; |
| Key *prv; |
| |
| prv = key_load_private(filename, "", NULL); |
| if (prv == NULL) { |
| if (identity_passphrase) |
| pass = xstrdup(identity_passphrase); |
| else |
| pass = read_passphrase("Enter passphrase: ", |
| RP_ALLOW_STDIN); |
| prv = key_load_private(filename, pass, NULL); |
| memset(pass, 0, strlen(pass)); |
| xfree(pass); |
| } |
| return prv; |
| } |
| |
| #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" |
| #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" |
| #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" |
| #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb |
| |
| static void |
| do_convert_to_ssh2(struct passwd *pw) |
| { |
| Key *k; |
| u_int len; |
| u_char *blob; |
| struct stat st; |
| |
| if (!have_identity) |
| ask_filename(pw, "Enter file in which the key is"); |
| if (stat(identity_file, &st) < 0) { |
| perror(identity_file); |
| exit(1); |
| } |
| if ((k = key_load_public(identity_file, NULL)) == NULL) { |
| if ((k = load_identity(identity_file)) == NULL) { |
| fprintf(stderr, "load failed\n"); |
| exit(1); |
| } |
| } |
| if (k->type == KEY_RSA1) { |
| fprintf(stderr, "version 1 keys are not supported\n"); |
| exit(1); |
| } |
| if (key_to_blob(k, &blob, &len) <= 0) { |
| fprintf(stderr, "key_to_blob failed\n"); |
| exit(1); |
| } |
| fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); |
| fprintf(stdout, |
| "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n", |
| key_size(k), key_type(k), |
| pw->pw_name, hostname); |
| dump_base64(stdout, blob, len); |
| fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); |
| key_free(k); |
| xfree(blob); |
| exit(0); |
| } |
| |
| static void |
| buffer_get_bignum_bits(Buffer *b, BIGNUM *value) |
| { |
| u_int bignum_bits = buffer_get_int(b); |
| u_int bytes = (bignum_bits + 7) / 8; |
| |
| if (buffer_len(b) < bytes) |
| fatal("buffer_get_bignum_bits: input buffer too small: " |
| "need %d have %d", bytes, buffer_len(b)); |
| if (BN_bin2bn(buffer_ptr(b), bytes, value) == NULL) |
| fatal("buffer_get_bignum_bits: BN_bin2bn failed"); |
| buffer_consume(b, bytes); |
| } |
| |
| static Key * |
| do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) |
| { |
| Buffer b; |
| Key *key = NULL; |
| char *type, *cipher; |
| u_char *sig, data[] = "abcde12345"; |
| int magic, rlen, ktype, i1, i2, i3, i4; |
| u_int slen; |
| u_long e; |
| |
| buffer_init(&b); |
| buffer_append(&b, blob, blen); |
| |
| magic = buffer_get_int(&b); |
| if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { |
| error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); |
| buffer_free(&b); |
| return NULL; |
| } |
| i1 = buffer_get_int(&b); |
| type = buffer_get_string(&b, NULL); |
| cipher = buffer_get_string(&b, NULL); |
| i2 = buffer_get_int(&b); |
| i3 = buffer_get_int(&b); |
| i4 = buffer_get_int(&b); |
| debug("ignore (%d %d %d %d)", i1, i2, i3, i4); |
| if (strcmp(cipher, "none") != 0) { |
| error("unsupported cipher %s", cipher); |
| xfree(cipher); |
| buffer_free(&b); |
| xfree(type); |
| return NULL; |
| } |
| xfree(cipher); |
| |
| if (strstr(type, "dsa")) { |
| ktype = KEY_DSA; |
| } else if (strstr(type, "rsa")) { |
| ktype = KEY_RSA; |
| } else { |
| buffer_free(&b); |
| xfree(type); |
| return NULL; |
| } |
| key = key_new_private(ktype); |
| xfree(type); |
| |
| switch (key->type) { |
| case KEY_DSA: |
| buffer_get_bignum_bits(&b, key->dsa->p); |
| buffer_get_bignum_bits(&b, key->dsa->g); |
| buffer_get_bignum_bits(&b, key->dsa->q); |
| buffer_get_bignum_bits(&b, key->dsa->pub_key); |
| buffer_get_bignum_bits(&b, key->dsa->priv_key); |
| break; |
| case KEY_RSA: |
| e = buffer_get_char(&b); |
| debug("e %lx", e); |
| if (e < 30) { |
| e <<= 8; |
| e += buffer_get_char(&b); |
| debug("e %lx", e); |
| e <<= 8; |
| e += buffer_get_char(&b); |
| debug("e %lx", e); |
| } |
| if (!BN_set_word(key->rsa->e, e)) { |
| buffer_free(&b); |
| key_free(key); |
| return NULL; |
| } |
| buffer_get_bignum_bits(&b, key->rsa->d); |
| buffer_get_bignum_bits(&b, key->rsa->n); |
| buffer_get_bignum_bits(&b, key->rsa->iqmp); |
| buffer_get_bignum_bits(&b, key->rsa->q); |
| buffer_get_bignum_bits(&b, key->rsa->p); |
| rsa_generate_additional_parameters(key->rsa); |
| break; |
| } |
| rlen = buffer_len(&b); |
| if (rlen != 0) |
| error("do_convert_private_ssh2_from_blob: " |
| "remaining bytes in key blob %d", rlen); |
| buffer_free(&b); |
| |
| /* try the key */ |
| key_sign(key, &sig, &slen, data, sizeof(data)); |
| key_verify(key, sig, slen, data, sizeof(data)); |
| xfree(sig); |
| return key; |
| } |
| |
| static int |
| get_line(FILE *fp, char *line, size_t len) |
| { |
| int c; |
| size_t pos = 0; |
| |
| line[0] = '\0'; |
| while ((c = fgetc(fp)) != EOF) { |
| if (pos >= len - 1) { |
| fprintf(stderr, "input line too long.\n"); |
| exit(1); |
| } |
| switch (c) { |
| case '\r': |
| c = fgetc(fp); |
| if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) { |
| fprintf(stderr, "unget: %s\n", strerror(errno)); |
| exit(1); |
| } |
| return pos; |
| case '\n': |
| return pos; |
| } |
| line[pos++] = c; |
| line[pos] = '\0'; |
| } |
| /* We reached EOF */ |
| return -1; |
| } |
| |
| static void |
| do_convert_from_ssh2(struct passwd *pw) |
| { |
| Key *k; |
| int blen; |
| u_int len; |
| char line[1024]; |
| u_char blob[8096]; |
| char encoded[8096]; |
| struct stat st; |
| int escaped = 0, private = 0, ok; |
| FILE *fp; |
| |
| if (!have_identity) |
| ask_filename(pw, "Enter file in which the key is"); |
| if (stat(identity_file, &st) < 0) { |
| perror(identity_file); |
| exit(1); |
| } |
| fp = fopen(identity_file, "r"); |
| if (fp == NULL) { |
| perror(identity_file); |
| exit(1); |
| } |
| encoded[0] = '\0'; |
| while ((blen = get_line(fp, line, sizeof(line))) != -1) { |
| if (line[blen - 1] == '\\') |
| escaped++; |
| if (strncmp(line, "----", 4) == 0 || |
| strstr(line, ": ") != NULL) { |
| if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) |
| private = 1; |
| if (strstr(line, " END ") != NULL) { |
| break; |
| } |
| /* fprintf(stderr, "ignore: %s", line); */ |
| continue; |
| } |
| if (escaped) { |
| escaped--; |
| /* fprintf(stderr, "escaped: %s", line); */ |
| continue; |
| } |
| strlcat(encoded, line, sizeof(encoded)); |
| } |
| len = strlen(encoded); |
| if (((len % 4) == 3) && |
| (encoded[len-1] == '=') && |
| (encoded[len-2] == '=') && |
| (encoded[len-3] == '=')) |
| encoded[len-3] = '\0'; |
| blen = uudecode(encoded, blob, sizeof(blob)); |
| if (blen < 0) { |
| fprintf(stderr, "uudecode failed.\n"); |
| exit(1); |
| } |
| k = private ? |
| do_convert_private_ssh2_from_blob(blob, blen) : |
| key_from_blob(blob, blen); |
| if (k == NULL) { |
| fprintf(stderr, "decode blob failed.\n"); |
| exit(1); |
| } |
| ok = private ? |
| (k->type == KEY_DSA ? |
| PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) : |
| PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) : |
| key_write(k, stdout); |
| if (!ok) { |
| fprintf(stderr, "key write failed"); |
| exit(1); |
| } |
| key_free(k); |
| if (!private) |
| fprintf(stdout, "\n"); |
| fclose(fp); |
| exit(0); |
| } |
| |
| static void |
| do_print_public(struct passwd *pw) |
| { |
| Key *prv; |
| struct stat st; |
| |
| if (!have_identity) |
| ask_filename(pw, "Enter file in which the key is"); |
| if (stat(identity_file, &st) < 0) { |
| perror(identity_file); |
| exit(1); |
| } |
| prv = load_identity(identity_file); |
| if (prv == NULL) { |
| fprintf(stderr, "load failed\n"); |
| exit(1); |
| } |
| if (!key_write(prv, stdout)) |
| fprintf(stderr, "key_write failed"); |
| key_free(prv); |
| fprintf(stdout, "\n"); |
| exit(0); |
| } |
| |
| #ifdef SMARTCARD |
| static void |
| do_upload(struct passwd *pw, const char *sc_reader_id) |
| { |
| Key *prv = NULL; |
| struct stat st; |
| int ret; |
| |
| if (!have_identity) |
| ask_filename(pw, "Enter file in which the key is"); |
| if (stat(identity_file, &st) < 0) { |
| perror(identity_file); |
| exit(1); |
| } |
| prv = load_identity(identity_file); |
| if (prv == NULL) { |
| error("load failed"); |
| exit(1); |
| } |
| ret = sc_put_key(prv, sc_reader_id); |
| key_free(prv); |
| if (ret < 0) |
| exit(1); |
| logit("loading key done"); |
| exit(0); |
| } |
| |
| static void |
| do_download(struct passwd *pw, const char *sc_reader_id) |
| { |
| Key **keys = NULL; |
| int i; |
| |
| keys = sc_get_keys(sc_reader_id, NULL); |
| if (keys == NULL) |
| fatal("cannot read public key from smartcard"); |
| for (i = 0; keys[i]; i++) { |
| key_write(keys[i], stdout); |
| key_free(keys[i]); |
| fprintf(stdout, "\n"); |
| } |
| xfree(keys); |
| exit(0); |
| } |
| #endif /* SMARTCARD */ |
| |
| static void |
| do_fingerprint(struct passwd *pw) |
| { |
| FILE *f; |
| Key *public; |
| char *comment = NULL, *cp, *ep, line[16*1024], *fp; |
| int i, skip = 0, num = 1, invalid = 1; |
| enum fp_rep rep; |
| enum fp_type fptype; |
| struct stat st; |
| |
| fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; |
| rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; |
| |
| if (!have_identity) |
| ask_filename(pw, "Enter file in which the key is"); |
| if (stat(identity_file, &st) < 0) { |
| perror(identity_file); |
| exit(1); |
| } |
| public = key_load_public(identity_file, &comment); |
| if (public != NULL) { |
| fp = key_fingerprint(public, fptype, rep); |
| printf("%u %s %s\n", key_size(public), fp, comment); |
| key_free(public); |
| xfree(comment); |
| xfree(fp); |
| exit(0); |
| } |
| if (comment) { |
| xfree(comment); |
| comment = NULL; |
| } |
| |
| f = fopen(identity_file, "r"); |
| if (f != NULL) { |
| while (fgets(line, sizeof(line), f)) { |
| i = strlen(line) - 1; |
| if (line[i] != '\n') { |
| error("line %d too long: %.40s...", num, line); |
| skip = 1; |
| continue; |
| } |
| num++; |
| if (skip) { |
| skip = 0; |
| continue; |
| } |
| line[i] = '\0'; |
| |
| /* Skip leading whitespace, empty and comment lines. */ |
| for (cp = line; *cp == ' ' || *cp == '\t'; cp++) |
| ; |
| if (!*cp || *cp == '\n' || *cp == '#') |
| continue; |
| i = strtol(cp, &ep, 10); |
| if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { |
| int quoted = 0; |
| comment = cp; |
| for (; *cp && (quoted || (*cp != ' ' && |
| *cp != '\t')); cp++) { |
| if (*cp == '\\' && cp[1] == '"') |
| cp++; /* Skip both */ |
| else if (*cp == '"') |
| quoted = !quoted; |
| } |
| if (!*cp) |
| continue; |
| *cp++ = '\0'; |
| } |
| ep = cp; |
| public = key_new(KEY_RSA1); |
| if (key_read(public, &cp) != 1) { |
| cp = ep; |
| key_free(public); |
| public = key_new(KEY_UNSPEC); |
| if (key_read(public, &cp) != 1) { |
| key_free(public); |
| continue; |
| } |
| } |
| comment = *cp ? cp : comment; |
| fp = key_fingerprint(public, fptype, rep); |
| printf("%u %s %s\n", key_size(public), fp, |
| comment ? comment : "no comment"); |
| xfree(fp); |
| key_free(public); |
| invalid = 0; |
| } |
| fclose(f); |
| } |
| if (invalid) { |
| printf("%s is not a public key file.\n", identity_file); |
| exit(1); |
| } |
| exit(0); |
| } |
| |
| static void |
| print_host(FILE *f, char *name, Key *public, int hash) |
| { |
| if (hash && (name = host_hash(name, NULL, 0)) == NULL) |
| fatal("hash_host failed"); |
| fprintf(f, "%s ", name); |
| if (!key_write(public, f)) |
| fatal("key_write failed"); |
| fprintf(f, "\n"); |
| } |
| |
| static void |
| do_known_hosts(struct passwd *pw, const char *name) |
| { |
| FILE *in, *out = stdout; |
| Key *public; |
| char *cp, *cp2, *kp, *kp2; |
| char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN]; |
| int c, i, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0; |
| |
| if (!have_identity) { |
| cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); |
| if (strlcpy(identity_file, cp, sizeof(identity_file)) >= |
| sizeof(identity_file)) |
| fatal("Specified known hosts path too long"); |
| xfree(cp); |
| have_identity = 1; |
| } |
| if ((in = fopen(identity_file, "r")) == NULL) |
| fatal("fopen: %s", strerror(errno)); |
| |
| /* |
| * Find hosts goes to stdout, hash and deletions happen in-place |
| * A corner case is ssh-keygen -HF foo, which should go to stdout |
| */ |
| if (!find_host && (hash_hosts || delete_host)) { |
| if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || |
| strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || |
| strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || |
| strlcat(old, ".old", sizeof(old)) >= sizeof(old)) |
| fatal("known_hosts path too long"); |
| umask(077); |
| if ((c = mkstemp(tmp)) == -1) |
| fatal("mkstemp: %s", strerror(errno)); |
| if ((out = fdopen(c, "w")) == NULL) { |
| c = errno; |
| unlink(tmp); |
| fatal("fdopen: %s", strerror(c)); |
| } |
| inplace = 1; |
| } |
| |
| while (fgets(line, sizeof(line), in)) { |
| num++; |
| i = strlen(line) - 1; |
| if (line[i] != '\n') { |
| error("line %d too long: %.40s...", num, line); |
| skip = 1; |
| invalid = 1; |
| continue; |
| } |
| if (skip) { |
| skip = 0; |
| continue; |
| } |
| line[i] = '\0'; |
| |
| /* Skip leading whitespace, empty and comment lines. */ |
| for (cp = line; *cp == ' ' || *cp == '\t'; cp++) |
| ; |
| if (!*cp || *cp == '\n' || *cp == '#') { |
| if (inplace) |
| fprintf(out, "%s\n", cp); |
| continue; |
| } |
| /* Find the end of the host name portion. */ |
| for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++) |
| ; |
| if (*kp == '\0' || *(kp + 1) == '\0') { |
| error("line %d missing key: %.40s...", |
| num, line); |
| invalid = 1; |
| continue; |
| } |
| *kp++ = '\0'; |
| kp2 = kp; |
| |
| public = key_new(KEY_RSA1); |
| if (key_read(public, &kp) != 1) { |
| kp = kp2; |
| key_free(public); |
| public = key_new(KEY_UNSPEC); |
| if (key_read(public, &kp) != 1) { |
| error("line %d invalid key: %.40s...", |
| num, line); |
| key_free(public); |
| invalid = 1; |
| continue; |
| } |
| } |
| |
| if (*cp == HASH_DELIM) { |
| if (find_host || delete_host) { |
| cp2 = host_hash(name, cp, strlen(cp)); |
| if (cp2 == NULL) { |
| error("line %d: invalid hashed " |
| "name: %.64s...", num, line); |
| invalid = 1; |
| continue; |
| } |
| c = (strcmp(cp2, cp) == 0); |
| if (find_host && c) { |
| printf("# Host %s found: " |
| "line %d type %s\n", name, |
| num, key_type(public)); |
| print_host(out, cp, public, 0); |
| } |
| if (delete_host && !c) |
| print_host(out, cp, public, 0); |
| } else if (hash_hosts) |
| print_host(out, cp, public, 0); |
| } else { |
| if (find_host || delete_host) { |
| c = (match_hostname(name, cp, |
| strlen(cp)) == 1); |
| if (find_host && c) { |
| printf("# Host %s found: " |
| "line %d type %s\n", name, |
| num, key_type(public)); |
| print_host(out, cp, public, hash_hosts); |
| } |
| if (delete_host && !c) |
| print_host(out, cp, public, 0); |
| } else if (hash_hosts) { |
| for (cp2 = strsep(&cp, ","); |
| cp2 != NULL && *cp2 != '\0'; |
| cp2 = strsep(&cp, ",")) { |
| if (strcspn(cp2, "*?!") != strlen(cp2)) |
| fprintf(stderr, "Warning: " |
| "ignoring host name with " |
| "metacharacters: %.64s\n", |
| cp2); |
| else |
| print_host(out, cp2, public, 1); |
| } |
| has_unhashed = 1; |
| } |
| } |
| key_free(public); |
| } |
| fclose(in); |
| |
| if (invalid) { |
| fprintf(stderr, "%s is not a valid known_host file.\n", |
| identity_file); |
| if (inplace) { |
| fprintf(stderr, "Not replacing existing known_hosts " |
| "file because of errors\n"); |
| fclose(out); |
| unlink(tmp); |
| } |
| exit(1); |
| } |
| |
| if (inplace) { |
| fclose(out); |
| |
| /* Backup existing file */ |
| if (unlink(old) == -1 && errno != ENOENT) |
| fatal("unlink %.100s: %s", old, strerror(errno)); |
| if (link(identity_file, old) == -1) |
| fatal("link %.100s to %.100s: %s", identity_file, old, |
| strerror(errno)); |
| /* Move new one into place */ |
| if (rename(tmp, identity_file) == -1) { |
| error("rename\"%s\" to \"%s\": %s", tmp, identity_file, |
| strerror(errno)); |
| unlink(tmp); |
| unlink(old); |
| exit(1); |
| } |
| |
| fprintf(stderr, "%s updated.\n", identity_file); |
| fprintf(stderr, "Original contents retained as %s\n", old); |
| if (has_unhashed) { |
| fprintf(stderr, "WARNING: %s contains unhashed " |
| "entries\n", old); |
| fprintf(stderr, "Delete this file to ensure privacy " |
| "of hostnames\n"); |
| } |
| } |
| |
| exit(0); |
| } |
| |
| /* |
| * Perform changing a passphrase. The argument is the passwd structure |
| * for the current user. |
| */ |
| static void |
| do_change_passphrase(struct passwd *pw) |
| { |
| char *comment; |
| char *old_passphrase, *passphrase1, *passphrase2; |
| struct stat st; |
| Key *private; |
| |
| if (!have_identity) |
| ask_filename(pw, "Enter file in which the key is"); |
| if (stat(identity_file, &st) < 0) { |
| perror(identity_file); |
| exit(1); |
| } |
| /* Try to load the file with empty passphrase. */ |
| private = key_load_private(identity_file, "", &comment); |
| if (private == NULL) { |
| if (identity_passphrase) |
| old_passphrase = xstrdup(identity_passphrase); |
| else |
| old_passphrase = |
| read_passphrase("Enter old passphrase: ", |
| RP_ALLOW_STDIN); |
| private = key_load_private(identity_file, old_passphrase, |
| &comment); |
| memset(old_passphrase, 0, strlen(old_passphrase)); |
| xfree(old_passphrase); |
| if (private == NULL) { |
| printf("Bad passphrase.\n"); |
| exit(1); |
| } |
| } |
| printf("Key has comment '%s'\n", comment); |
| |
| /* Ask the new passphrase (twice). */ |
| if (identity_new_passphrase) { |
| passphrase1 = xstrdup(identity_new_passphrase); |
| passphrase2 = NULL; |
| } else { |
| passphrase1 = |
| read_passphrase("Enter new passphrase (empty for no " |
| "passphrase): ", RP_ALLOW_STDIN); |
| passphrase2 = read_passphrase("Enter same passphrase again: ", |
| RP_ALLOW_STDIN); |
| |
| /* Verify that they are the same. */ |
| if (strcmp(passphrase1, passphrase2) != 0) { |
| memset(passphrase1, 0, strlen(passphrase1)); |
| memset(passphrase2, 0, strlen(passphrase2)); |
| xfree(passphrase1); |
| xfree(passphrase2); |
| printf("Pass phrases do not match. Try again.\n"); |
| exit(1); |
| } |
| /* Destroy the other copy. */ |
| memset(passphrase2, 0, strlen(passphrase2)); |
| xfree(passphrase2); |
| } |
| |
| /* Save the file using the new passphrase. */ |
| if (!key_save_private(private, identity_file, passphrase1, comment)) { |
| printf("Saving the key failed: %s.\n", identity_file); |
| memset(passphrase1, 0, strlen(passphrase1)); |
| xfree(passphrase1); |
| key_free(private); |
| xfree(comment); |
| exit(1); |
| } |
| /* Destroy the passphrase and the copy of the key in memory. */ |
| memset(passphrase1, 0, strlen(passphrase1)); |
| xfree(passphrase1); |
| key_free(private); /* Destroys contents */ |
| xfree(comment); |
| |
| printf("Your identification has been saved with the new passphrase.\n"); |
| exit(0); |
| } |
| |
| /* |
| * Print the SSHFP RR. |
| */ |
| static int |
| do_print_resource_record(struct passwd *pw, char *fname, char *hname) |
| { |
| Key *public; |
| char *comment = NULL; |
| struct stat st; |
| |
| if (fname == NULL) |
| ask_filename(pw, "Enter file in which the key is"); |
| if (stat(fname, &st) < 0) { |
| if (errno == ENOENT) |
| return 0; |
| perror(fname); |
| exit(1); |
| } |
| public = key_load_public(fname, &comment); |
| if (public != NULL) { |
| export_dns_rr(hname, public, stdout, print_generic); |
| key_free(public); |
| xfree(comment); |
| return 1; |
| } |
| if (comment) |
| xfree(comment); |
| |
| printf("failed to read v2 public key from %s.\n", fname); |
| exit(1); |
| } |
| |
| /* |
| * Change the comment of a private key file. |
| */ |
| static void |
| do_change_comment(struct passwd *pw) |
| { |
| char new_comment[1024], *comment, *passphrase; |
| Key *private; |
| Key *public; |
| struct stat st; |
| FILE *f; |
| int fd; |
| |
| if (!have_identity) |
| ask_filename(pw, "Enter file in which the key is"); |
| if (stat(identity_file, &st) < 0) { |
| perror(identity_file); |
| exit(1); |
| } |
| private = key_load_private(identity_file, "", &comment); |
| if (private == NULL) { |
| if (identity_passphrase) |
| passphrase = xstrdup(identity_passphrase); |
| else if (identity_new_passphrase) |
| passphrase = xstrdup(identity_new_passphrase); |
| else |
| passphrase = read_passphrase("Enter passphrase: ", |
| RP_ALLOW_STDIN); |
| /* Try to load using the passphrase. */ |
| private = key_load_private(identity_file, passphrase, &comment); |
| if (private == NULL) { |
| memset(passphrase, 0, strlen(passphrase)); |
| xfree(passphrase); |
| printf("Bad passphrase.\n"); |
| exit(1); |
| } |
| } else { |
| passphrase = xstrdup(""); |
| } |
| if (private->type != KEY_RSA1) { |
| fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); |
| key_free(private); |
| exit(1); |
| } |
| printf("Key now has comment '%s'\n", comment); |
| |
| if (identity_comment) { |
| strlcpy(new_comment, identity_comment, sizeof(new_comment)); |
| } else { |
| printf("Enter new comment: "); |
| fflush(stdout); |
| if (!fgets(new_comment, sizeof(new_comment), stdin)) { |
| memset(passphrase, 0, strlen(passphrase)); |
| key_free(private); |
| exit(1); |
| } |
| if (strchr(new_comment, '\n')) |
| *strchr(new_comment, '\n') = 0; |
| } |
| |
| /* Save the file using the new passphrase. */ |
| if (!key_save_private(private, identity_file, passphrase, new_comment)) { |
| printf("Saving the key failed: %s.\n", identity_file); |
| memset(passphrase, 0, strlen(passphrase)); |
| xfree(passphrase); |
| key_free(private); |
| xfree(comment); |
| exit(1); |
| } |
| memset(passphrase, 0, strlen(passphrase)); |
| xfree(passphrase); |
| public = key_from_private(private); |
| key_free(private); |
| |
| strlcat(identity_file, ".pub", sizeof(identity_file)); |
| fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); |
| if (fd == -1) { |
| printf("Could not save your public key in %s\n", identity_file); |
| exit(1); |
| } |
| f = fdopen(fd, "w"); |
| if (f == NULL) { |
| printf("fdopen %s failed", identity_file); |
| exit(1); |
| } |
| if (!key_write(public, f)) |
| fprintf(stderr, "write key failed"); |
| key_free(public); |
| fprintf(f, " %s\n", new_comment); |
| fclose(f); |
| |
| xfree(comment); |
| |
| printf("The comment in your key file has been changed.\n"); |
| exit(0); |
| } |
| |
| static void |
| usage(void) |
| { |
| fprintf(stderr, "Usage: %s [options]\n", __progname); |
| fprintf(stderr, "Options:\n"); |
| fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n"); |
| fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); |
| fprintf(stderr, " -b bits Number of bits in the key to create.\n"); |
| fprintf(stderr, " -C comment Provide new comment.\n"); |
| fprintf(stderr, " -c Change comment in private and public key files.\n"); |
| #ifdef SMARTCARD |
| fprintf(stderr, " -D reader Download public key from smartcard.\n"); |
| #endif /* SMARTCARD */ |
| fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n"); |
| fprintf(stderr, " -F hostname Find hostname in known hosts file.\n"); |
| fprintf(stderr, " -f filename Filename of the key file.\n"); |
| fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n"); |
| fprintf(stderr, " -g Use generic DNS resource record format.\n"); |
| fprintf(stderr, " -H Hash names in known_hosts file.\n"); |
| fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n"); |
| fprintf(stderr, " -l Show fingerprint of key file.\n"); |
| fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n"); |
| fprintf(stderr, " -N phrase Provide new passphrase.\n"); |
| fprintf(stderr, " -P phrase Provide old passphrase.\n"); |
| fprintf(stderr, " -p Change passphrase of private key file.\n"); |
| fprintf(stderr, " -q Quiet.\n"); |
| fprintf(stderr, " -R hostname Remove host from known_hosts file.\n"); |
| fprintf(stderr, " -r hostname Print DNS resource record.\n"); |
| fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n"); |
| fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n"); |
| fprintf(stderr, " -t type Specify type of key to create.\n"); |
| #ifdef SMARTCARD |
| fprintf(stderr, " -U reader Upload private key to smartcard.\n"); |
| #endif /* SMARTCARD */ |
| fprintf(stderr, " -v Verbose.\n"); |
| fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n"); |
| fprintf(stderr, " -y Read private key file and print public key.\n"); |
| |
| exit(1); |
| } |
| |
| /* |
| * Main program for key management. |
| */ |
| int |
| main(int argc, char **argv) |
| { |
| char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; |
| char out_file[MAXPATHLEN], *reader_id = NULL; |
| char *rr_hostname = NULL; |
| Key *private, *public; |
| struct passwd *pw; |
| struct stat st; |
| int opt, type, fd, download = 0; |
| u_int32_t memory = 0, generator_wanted = 0, trials = 100; |
| int do_gen_candidates = 0, do_screen_candidates = 0; |
| int log_level = SYSLOG_LEVEL_INFO; |
| BIGNUM *start = NULL; |
| FILE *f; |
| const char *errstr; |
| |
| extern int optind; |
| extern char *optarg; |
| |
| /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
| sanitise_stdfd(); |
| |
| __progname = ssh_get_progname(av[0]); |
| |
| SSLeay_add_all_algorithms(); |
| log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); |
| |
| init_rng(); |
| seed_rng(); |
| |
| /* we need this for the home * directory. */ |
| pw = getpwuid(getuid()); |
| if (!pw) { |
| printf("You don't exist, go away!\n"); |
| exit(1); |
| } |
| if (gethostname(hostname, sizeof(hostname)) < 0) { |
| perror("gethostname"); |
| exit(1); |
| } |
| |
| while ((opt = getopt(argc, argv, |
| "degiqpclBHvxXyF:b:f:t:U:D:P:N:C:r:g:R:T:G:M:S:a:W:")) != -1) { |
| switch (opt) { |
| case 'b': |
| bits = (u_int32_t)strtonum(optarg, 768, 32768, &errstr); |
| if (errstr) |
| fatal("Bits has bad value %s (%s)", |
| optarg, errstr); |
| break; |
| case 'F': |
| find_host = 1; |
| rr_hostname = optarg; |
| break; |
| case 'H': |
| hash_hosts = 1; |
| break; |
| case 'R': |
| delete_host = 1; |
| rr_hostname = optarg; |
| break; |
| case 'l': |
| print_fingerprint = 1; |
| break; |
| case 'B': |
| print_bubblebabble = 1; |
| break; |
| case 'p': |
| change_passphrase = 1; |
| break; |
| case 'c': |
| change_comment = 1; |
| break; |
| case 'f': |
| if (strlcpy(identity_file, optarg, sizeof(identity_file)) >= |
| sizeof(identity_file)) |
| fatal("Identity filename too long"); |
| have_identity = 1; |
| break; |
| case 'g': |
| print_generic = 1; |
| break; |
| case 'P': |
| identity_passphrase = optarg; |
| break; |
| case 'N': |
| identity_new_passphrase = optarg; |
| break; |
| case 'C': |
| identity_comment = optarg; |
| break; |
| case 'q': |
| quiet = 1; |
| break; |
| case 'e': |
| case 'x': |
| /* export key */ |
| convert_to_ssh2 = 1; |
| break; |
| case 'i': |
| case 'X': |
| /* import key */ |
| convert_from_ssh2 = 1; |
| break; |
| case 'y': |
| print_public = 1; |
| break; |
| case 'd': |
| key_type_name = "dsa"; |
| break; |
| case 't': |
| key_type_name = optarg; |
| break; |
| case 'D': |
| download = 1; |
| /*FALLTHROUGH*/ |
| case 'U': |
| reader_id = optarg; |
| break; |
| case 'v': |
| if (log_level == SYSLOG_LEVEL_INFO) |
| log_level = SYSLOG_LEVEL_DEBUG1; |
| else { |
| if (log_level >= SYSLOG_LEVEL_DEBUG1 && |
| log_level < SYSLOG_LEVEL_DEBUG3) |
| log_level++; |
| } |
| break; |
| case 'r': |
| rr_hostname = optarg; |
| break; |
| case 'W': |
| generator_wanted = (u_int32_t)strtonum(optarg, 1, |
| UINT_MAX, &errstr); |
| if (errstr) |
| fatal("Desired generator has bad value: %s (%s)", |
| optarg, errstr); |
| break; |
| case 'a': |
| trials = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); |
| if (errstr) |
| fatal("Invalid number of trials: %s (%s)", |
| optarg, errstr); |
| break; |
| case 'M': |
| memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); |
| if (errstr) { |
| fatal("Memory limit is %s: %s", errstr, optarg); |
| } |
| break; |
| case 'G': |
| do_gen_candidates = 1; |
| if (strlcpy(out_file, optarg, sizeof(out_file)) >= |
| sizeof(out_file)) |
| fatal("Output filename too long"); |
| break; |
| case 'T': |
| do_screen_candidates = 1; |
| if (strlcpy(out_file, optarg, sizeof(out_file)) >= |
| sizeof(out_file)) |
| fatal("Output filename too long"); |
| break; |
| case 'S': |
| /* XXX - also compare length against bits */ |
| if (BN_hex2bn(&start, optarg) == 0) |
| fatal("Invalid start point."); |
| break; |
| case '?': |
| default: |
| usage(); |
| } |
| } |
| |
| /* reinit */ |
| log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); |
| |
| if (optind < argc) { |
| printf("Too many arguments.\n"); |
| usage(); |
| } |
| if (change_passphrase && change_comment) { |
| printf("Can only have one of -p and -c.\n"); |
| usage(); |
| } |
| if (delete_host || hash_hosts || find_host) |
| do_known_hosts(pw, rr_hostname); |
| if (print_fingerprint || print_bubblebabble) |
| do_fingerprint(pw); |
| if (change_passphrase) |
| do_change_passphrase(pw); |
| if (change_comment) |
| do_change_comment(pw); |
| if (convert_to_ssh2) |
| do_convert_to_ssh2(pw); |
| if (convert_from_ssh2) |
| do_convert_from_ssh2(pw); |
| if (print_public) |
| do_print_public(pw); |
| if (rr_hostname != NULL) { |
| unsigned int n = 0; |
| |
| if (have_identity) { |
| n = do_print_resource_record(pw, |
| identity_file, rr_hostname); |
| if (n == 0) { |
| perror(identity_file); |
| exit(1); |
| } |
| exit(0); |
| } else { |
| |
| n += do_print_resource_record(pw, |
| _PATH_HOST_RSA_KEY_FILE, rr_hostname); |
| n += do_print_resource_record(pw, |
| _PATH_HOST_DSA_KEY_FILE, rr_hostname); |
| |
| if (n == 0) |
| fatal("no keys found."); |
| exit(0); |
| } |
| } |
| if (reader_id != NULL) { |
| #ifdef SMARTCARD |
| if (download) |
| do_download(pw, reader_id); |
| else |
| do_upload(pw, reader_id); |
| #else /* SMARTCARD */ |
| fatal("no support for smartcards."); |
| #endif /* SMARTCARD */ |
| } |
| |
| if (do_gen_candidates) { |
| FILE *out = fopen(out_file, "w"); |
| |
| if (out == NULL) { |
| error("Couldn't open modulus candidate file \"%s\": %s", |
| out_file, strerror(errno)); |
| return (1); |
| } |
| if (bits == 0) |
| bits = DEFAULT_BITS; |
| if (gen_candidates(out, memory, bits, start) != 0) |
| fatal("modulus candidate generation failed"); |
| |
| return (0); |
| } |
| |
| if (do_screen_candidates) { |
| FILE *in; |
| FILE *out = fopen(out_file, "w"); |
| |
| if (have_identity && strcmp(identity_file, "-") != 0) { |
| if ((in = fopen(identity_file, "r")) == NULL) { |
| fatal("Couldn't open modulus candidate " |
| "file \"%s\": %s", identity_file, |
| strerror(errno)); |
| } |
| } else |
| in = stdin; |
| |
| if (out == NULL) { |
| fatal("Couldn't open moduli file \"%s\": %s", |
| out_file, strerror(errno)); |
| } |
| if (prime_test(in, out, trials, generator_wanted) != 0) |
| fatal("modulus screening failed"); |
| return (0); |
| } |
| |
| arc4random_stir(); |
| |
| if (key_type_name == NULL) |
| key_type_name = "rsa"; |
| |
| type = key_type_from_name(key_type_name); |
| if (type == KEY_UNSPEC) { |
| fprintf(stderr, "unknown key type %s\n", key_type_name); |
| exit(1); |
| } |
| if (bits == 0) |
| bits = (type == KEY_DSA) ? DEFAULT_BITS_DSA : DEFAULT_BITS; |
| if (type == KEY_DSA && bits != 1024) |
| fatal("DSA keys must be 1024 bits"); |
| if (!quiet) |
| printf("Generating public/private %s key pair.\n", key_type_name); |
| private = key_generate(type, bits); |
| if (private == NULL) { |
| fprintf(stderr, "key_generate failed"); |
| exit(1); |
| } |
| public = key_from_private(private); |
| |
| if (!have_identity) |
| ask_filename(pw, "Enter file in which to save the key"); |
| |
| /* Create ~/.ssh directory if it doesn't already exist. */ |
| snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR); |
| if (strstr(identity_file, dotsshdir) != NULL && |
| stat(dotsshdir, &st) < 0) { |
| if (mkdir(dotsshdir, 0700) < 0) |
| error("Could not create directory '%s'.", dotsshdir); |
| else if (!quiet) |
| printf("Created directory '%s'.\n", dotsshdir); |
| } |
| /* If the file already exists, ask the user to confirm. */ |
| if (stat(identity_file, &st) >= 0) { |
| char yesno[3]; |
| printf("%s already exists.\n", identity_file); |
| printf("Overwrite (y/n)? "); |
| fflush(stdout); |
| if (fgets(yesno, sizeof(yesno), stdin) == NULL) |
| exit(1); |
| if (yesno[0] != 'y' && yesno[0] != 'Y') |
| exit(1); |
| } |
| /* Ask for a passphrase (twice). */ |
| if (identity_passphrase) |
| passphrase1 = xstrdup(identity_passphrase); |
| else if (identity_new_passphrase) |
| passphrase1 = xstrdup(identity_new_passphrase); |
| else { |
| passphrase_again: |
| passphrase1 = |
| read_passphrase("Enter passphrase (empty for no " |
| "passphrase): ", RP_ALLOW_STDIN); |
| passphrase2 = read_passphrase("Enter same passphrase again: ", |
| RP_ALLOW_STDIN); |
| if (strcmp(passphrase1, passphrase2) != 0) { |
| /* |
| * The passphrases do not match. Clear them and |
| * retry. |
| */ |
| memset(passphrase1, 0, strlen(passphrase1)); |
| memset(passphrase2, 0, strlen(passphrase2)); |
| xfree(passphrase1); |
| xfree(passphrase2); |
| printf("Passphrases do not match. Try again.\n"); |
| goto passphrase_again; |
| } |
| /* Clear the other copy of the passphrase. */ |
| memset(passphrase2, 0, strlen(passphrase2)); |
| xfree(passphrase2); |
| } |
| |
| if (identity_comment) { |
| strlcpy(comment, identity_comment, sizeof(comment)); |
| } else { |
| /* Create default commend field for the passphrase. */ |
| snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); |
| } |
| |
| /* Save the key with the given passphrase and comment. */ |
| if (!key_save_private(private, identity_file, passphrase1, comment)) { |
| printf("Saving the key failed: %s.\n", identity_file); |
| memset(passphrase1, 0, strlen(passphrase1)); |
| xfree(passphrase1); |
| exit(1); |
| } |
| /* Clear the passphrase. */ |
| memset(passphrase1, 0, strlen(passphrase1)); |
| xfree(passphrase1); |
| |
| /* Clear the private key and the random number generator. */ |
| key_free(private); |
| arc4random_stir(); |
| |
| if (!quiet) |
| printf("Your identification has been saved in %s.\n", identity_file); |
| |
| strlcat(identity_file, ".pub", sizeof(identity_file)); |
| fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); |
| if (fd == -1) { |
| printf("Could not save your public key in %s\n", identity_file); |
| exit(1); |
| } |
| f = fdopen(fd, "w"); |
| if (f == NULL) { |
| printf("fdopen %s failed", identity_file); |
| exit(1); |
| } |
| if (!key_write(public, f)) |
| fprintf(stderr, "write key failed"); |
| fprintf(f, " %s\n", comment); |
| fclose(f); |
| |
| if (!quiet) { |
| char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); |
| printf("Your public key has been saved in %s.\n", |
| identity_file); |
| printf("The key fingerprint is:\n"); |
| printf("%s %s\n", fp, comment); |
| xfree(fp); |
| } |
| |
| key_free(public); |
| exit(0); |
| } |