diff options
Diffstat (limited to 'crypto/openssh/ssh-keygen.c')
| -rw-r--r-- | crypto/openssh/ssh-keygen.c | 556 |
1 files changed, 556 insertions, 0 deletions
diff --git a/crypto/openssh/ssh-keygen.c b/crypto/openssh/ssh-keygen.c new file mode 100644 index 0000000..93ae2da --- /dev/null +++ b/crypto/openssh/ssh-keygen.c @@ -0,0 +1,556 @@ +/* + * Author: Tatu Ylonen <ylo@cs.hut.fi> + * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland + * All rights reserved + * Created: Mon Mar 27 02:26:40 1995 ylo + * Identity and host key generation and maintenance. + */ + +#include "includes.h" +RCSID("$Id: ssh-keygen.c,v 1.16 2000/02/04 14:34:09 markus Exp $"); + +#include "rsa.h" +#include "ssh.h" +#include "xmalloc.h" +#include "fingerprint.h" + +/* Generated private key. */ +RSA *private_key; + +/* Generated public key. */ +RSA *public_key; + +/* Number of bits in the RSA key. This value can be changed on the command line. */ +int bits = 1024; + +/* + * 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 just want to see the key fingerprint */ +int print_fingerprint = 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; + +/* argv0 */ +extern char *__progname; + +void +ask_filename(struct passwd *pw, const char *prompt) +{ + char buf[1024]; + snprintf(identity_file, sizeof(identity_file), "%s/%s", + pw->pw_dir, SSH_CLIENT_IDENTITY); + printf("%s (%s): ", prompt, identity_file); + fflush(stdout); + 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; +} + +void +do_fingerprint(struct passwd *pw) +{ + FILE *f; + BIGNUM *e, *n; + RSA *public_key; + char *comment = NULL, *cp, *ep, line[16*1024]; + int i, skip = 0, num = 1, invalid = 1; + 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); + } + + public_key = RSA_new(); + if (load_public_key(identity_file, public_key, &comment)) { + printf("%d %s %s\n", BN_num_bits(public_key->n), + fingerprint(public_key->e, public_key->n), + comment); + RSA_free(public_key); + exit(0); + } + RSA_free(public_key); + + f = fopen(identity_file, "r"); + if (f != NULL) { + n = BN_new(); + e = BN_new(); + 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; + if (auth_rsa_read_key(&cp, &i, e, n)) { + invalid = 0; + comment = *cp ? cp : comment; + printf("%d %s %s\n", BN_num_bits(n), + fingerprint(e, n), + comment ? comment : "no comment"); + } + } + BN_free(e); + BN_free(n); + fclose(f); + } + if (invalid) { + printf("%s is not a valid key file.\n", identity_file); + exit(1); + } + exit(0); +} + +/* + * Perform changing a passphrase. The argument is the passwd structure + * for the current user. + */ +void +do_change_passphrase(struct passwd *pw) +{ + char *comment; + char *old_passphrase, *passphrase1, *passphrase2; + struct stat st; + RSA *private_key; + + 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 = RSA_new(); + if (!load_public_key(identity_file, public_key, NULL)) { + printf("%s is not a valid key file.\n", identity_file); + exit(1); + } + /* Clear the public key since we are just about to load the whole file. */ + RSA_free(public_key); + + /* Try to load the file with empty passphrase. */ + private_key = RSA_new(); + if (!load_private_key(identity_file, "", private_key, &comment)) { + if (identity_passphrase) + old_passphrase = xstrdup(identity_passphrase); + else + old_passphrase = read_passphrase("Enter old passphrase: ", 1); + if (!load_private_key(identity_file, old_passphrase, private_key, &comment)) { + memset(old_passphrase, 0, strlen(old_passphrase)); + xfree(old_passphrase); + printf("Bad passphrase.\n"); + exit(1); + } + memset(old_passphrase, 0, strlen(old_passphrase)); + xfree(old_passphrase); + } + 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): ", 1); + passphrase2 = read_passphrase("Enter same passphrase again: ", 1); + + /* 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 (!save_private_key(identity_file, passphrase1, private_key, comment)) { + printf("Saving the key failed: %s: %s.\n", + identity_file, strerror(errno)); + memset(passphrase1, 0, strlen(passphrase1)); + xfree(passphrase1); + RSA_free(private_key); + xfree(comment); + exit(1); + } + /* Destroy the passphrase and the copy of the key in memory. */ + memset(passphrase1, 0, strlen(passphrase1)); + xfree(passphrase1); + RSA_free(private_key); /* Destroys contents */ + xfree(comment); + + printf("Your identification has been saved with the new passphrase.\n"); + exit(0); +} + +/* + * Change the comment of a private key file. + */ +void +do_change_comment(struct passwd *pw) +{ + char new_comment[1024], *comment; + RSA *private_key; + char *passphrase; + struct stat st; + FILE *f; + char *tmpbuf; + + 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 public key from the file the verify that it is + * readable and of the proper format. + */ + public_key = RSA_new(); + if (!load_public_key(identity_file, public_key, NULL)) { + printf("%s is not a valid key file.\n", identity_file); + exit(1); + } + private_key = RSA_new(); + + if (load_private_key(identity_file, "", private_key, &comment)) + passphrase = xstrdup(""); + else { + if (identity_passphrase) + passphrase = xstrdup(identity_passphrase); + else if (identity_new_passphrase) + passphrase = xstrdup(identity_new_passphrase); + else + passphrase = read_passphrase("Enter passphrase: ", 1); + /* Try to load using the passphrase. */ + if (!load_private_key(identity_file, passphrase, private_key, &comment)) { + memset(passphrase, 0, strlen(passphrase)); + xfree(passphrase); + printf("Bad passphrase.\n"); + 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)); + RSA_free(private_key); + exit(1); + } + if (strchr(new_comment, '\n')) + *strchr(new_comment, '\n') = 0; + } + + /* Save the file using the new passphrase. */ + if (!save_private_key(identity_file, passphrase, private_key, new_comment)) { + printf("Saving the key failed: %s: %s.\n", + identity_file, strerror(errno)); + memset(passphrase, 0, strlen(passphrase)); + xfree(passphrase); + RSA_free(private_key); + xfree(comment); + exit(1); + } + memset(passphrase, 0, strlen(passphrase)); + xfree(passphrase); + RSA_free(private_key); + + strlcat(identity_file, ".pub", sizeof(identity_file)); + f = fopen(identity_file, "w"); + if (!f) { + printf("Could not save your public key in %s\n", identity_file); + exit(1); + } + fprintf(f, "%d ", BN_num_bits(public_key->n)); + tmpbuf = BN_bn2dec(public_key->e); + fprintf(f, "%s ", tmpbuf); + free(tmpbuf); + tmpbuf = BN_bn2dec(public_key->n); + fprintf(f, "%s %s\n", tmpbuf, new_comment); + free(tmpbuf); + fclose(f); + + xfree(comment); + + printf("The comment in your key file has been changed.\n"); + exit(0); +} + +void +usage(void) +{ + printf("ssh-keygen version %s\n", SSH_VERSION); + printf("Usage: %s [-b bits] [-p] [-c] [-l] [-f file] [-P pass] [-N new-pass] [-C comment]\n", __progname); + exit(1); +} + +/* + * Main program for key management. + */ +int +main(int ac, char **av) +{ + char dotsshdir[16 * 1024], comment[1024], *passphrase1, *passphrase2; + struct passwd *pw; + char *tmpbuf; + int opt; + struct stat st; + FILE *f; + char hostname[MAXHOSTNAMELEN]; + extern int optind; + extern char *optarg; + + /* check if RSA support exists */ + if (rsa_alive() == 0) { + fprintf(stderr, + "%s: no RSA support in libssl and libcrypto. See ssl(8).\n", + __progname); + exit(1); + } + /* we need this for the home * directory. */ + pw = getpwuid(getuid()); + if (!pw) { + printf("You don't exist, go away!\n"); + exit(1); + } + + while ((opt = getopt(ac, av, "qpclb:f:P:N:C:")) != EOF) { + switch (opt) { + case 'b': + bits = atoi(optarg); + if (bits < 512 || bits > 32768) { + printf("Bits has bad value.\n"); + exit(1); + } + break; + + case 'l': + print_fingerprint = 1; + break; + + case 'p': + change_passphrase = 1; + break; + + case 'c': + change_comment = 1; + break; + + case 'f': + strlcpy(identity_file, optarg, sizeof(identity_file)); + have_identity = 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 '?': + default: + usage(); + } + } + if (optind < ac) { + printf("Too many arguments.\n"); + usage(); + } + if (change_passphrase && change_comment) { + printf("Can only have one of -p and -c.\n"); + usage(); + } + if (print_fingerprint) + do_fingerprint(pw); + if (change_passphrase) + do_change_passphrase(pw); + if (change_comment) + do_change_comment(pw); + + arc4random_stir(); + + if (quiet) + rsa_set_verbose(0); + + /* Generate the rsa key pair. */ + private_key = RSA_new(); + public_key = RSA_new(); + rsa_generate_key(private_key, public_key, bits); + + 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, SSH_USER_DIR); + if (strstr(identity_file, dotsshdir) != NULL && + stat(dotsshdir, &st) < 0) { + if (mkdir(dotsshdir, 0755) < 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): ", 1); + passphrase2 = read_passphrase("Enter same passphrase again: ", 1); + 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. */ + if (gethostname(hostname, sizeof(hostname)) < 0) { + perror("gethostname"); + exit(1); + } + snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); + } + + /* Save the key with the given passphrase and comment. */ + if (!save_private_key(identity_file, passphrase1, private_key, comment)) { + printf("Saving the key failed: %s: %s.\n", + identity_file, strerror(errno)); + 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. */ + RSA_free(private_key); + arc4random_stir(); + + if (!quiet) + printf("Your identification has been saved in %s.\n", identity_file); + + strlcat(identity_file, ".pub", sizeof(identity_file)); + f = fopen(identity_file, "w"); + if (!f) { + printf("Could not save your public key in %s\n", identity_file); + exit(1); + } + fprintf(f, "%d ", BN_num_bits(public_key->n)); + tmpbuf = BN_bn2dec(public_key->e); + fprintf(f, "%s ", tmpbuf); + free(tmpbuf); + tmpbuf = BN_bn2dec(public_key->n); + fprintf(f, "%s %s\n", tmpbuf, comment); + free(tmpbuf); + fclose(f); + + if (!quiet) { + printf("Your public key has been saved in %s.\n", identity_file); + printf("The key fingerprint is:\n"); + printf("%d %s %s\n", BN_num_bits(public_key->n), + fingerprint(public_key->e, public_key->n), + comment); + } + exit(0); +} |
