X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/0e0bba6891e9356646571465ecde7cac887baf41..5498741cc14208f105eb8341046536b21a0c31db:/ssh-add.c diff --git a/ssh-add.c b/ssh-add.c index 6d79357c..4dc46f6d 100644 --- a/ssh-add.c +++ b/ssh-add.c @@ -1,3 +1,4 @@ +/* $OpenBSD: ssh-add.c,v 1.89 2006/08/03 03:34:42 deraadt Exp $ */ /* * Author: Tatu Ylonen * Copyright (c) 1995 Tatu Ylonen , Espoo, Finland @@ -35,25 +36,31 @@ */ #include "includes.h" -RCSID("$OpenBSD: ssh-add.c,v 1.49 2001/12/24 07:29:43 deraadt Exp $"); + +#include +#include +#include #include +#include +#include +#include +#include +#include +#include +#include + +#include "xmalloc.h" #include "ssh.h" #include "rsa.h" #include "log.h" -#include "xmalloc.h" #include "key.h" +#include "buffer.h" #include "authfd.h" #include "authfile.h" #include "pathnames.h" -#include "readpass.h" - -#ifdef HAVE___PROGNAME -extern char *__progname; -#else -char *__progname; -#endif +#include "misc.h" /* argv0 */ extern char *__progname; @@ -62,10 +69,15 @@ extern char *__progname; static char *default_files[] = { _PATH_SSH_CLIENT_ID_RSA, _PATH_SSH_CLIENT_ID_DSA, - _PATH_SSH_CLIENT_IDENTITY, + _PATH_SSH_CLIENT_IDENTITY, NULL }; +/* Default lifetime (0 == forever) */ +static int lifetime = 0; + +/* User has to confirm key use */ +static int confirm = 0; /* we keep a cache of one passphrases */ static char *pass = NULL; @@ -125,16 +137,25 @@ delete_all(AuthenticationConnection *ac) static int add_file(AuthenticationConnection *ac, const char *filename) { - struct stat st; Key *private; char *comment = NULL; char msg[1024]; - int ret = -1; + int fd, perms_ok, ret = -1; - if (stat(filename, &st) < 0) { + if ((fd = open(filename, O_RDONLY)) < 0) { perror(filename); return -1; } + + /* + * Since we'll try to load a keyfile multiple times, permission errors + * will occur multiple times, so check perms first and bail if wrong. + */ + perms_ok = key_perm_ok(fd, filename); + close(fd); + if (!perms_ok) + return -1; + /* At first, try empty passphrase */ private = key_load_private(filename, "", &comment); if (comment == NULL) @@ -146,7 +167,7 @@ add_file(AuthenticationConnection *ac, const char *filename) /* clear passphrase since it did not work */ clear_pass(); snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ", - comment); + comment); for (;;) { pass = read_passphrase(msg, RP_ALLOW_STDIN); if (strcmp(pass, "") == 0) { @@ -158,14 +179,27 @@ add_file(AuthenticationConnection *ac, const char *filename) if (private != NULL) break; clear_pass(); - strlcpy(msg, "Bad passphrase, try again: ", sizeof msg); + snprintf(msg, sizeof msg, + "Bad passphrase, try again for %.200s: ", comment); } } - if (ssh_add_identity(ac, private, comment)) { + + if (ssh_add_identity_constrained(ac, private, comment, lifetime, + confirm)) { fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); ret = 0; - } else + if (lifetime != 0) + fprintf(stderr, + "Lifetime set to %d seconds\n", lifetime); + if (confirm != 0) + fprintf(stderr, + "The user has to confirm each use of the key\n"); + } else if (ssh_add_identity(ac, private, comment)) { + fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); + ret = 0; + } else { fprintf(stderr, "Could not add identity: %s\n", filename); + } xfree(comment); key_free(private); @@ -176,18 +210,27 @@ add_file(AuthenticationConnection *ac, const char *filename) static int update_card(AuthenticationConnection *ac, int add, const char *id) { - if (ssh_update_card(ac, add, id)) { + char *pin; + int ret = -1; + + pin = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN); + if (pin == NULL) + return -1; + + if (ssh_update_card(ac, add, id, pin, lifetime, confirm)) { fprintf(stderr, "Card %s: %s\n", add ? "added" : "removed", id); - return 0; + ret = 0; } else { fprintf(stderr, "Could not %s card: %s\n", add ? "add" : "remove", id); - return -1; + ret = -1; } + xfree(pin); + return ret; } -static void +static int list_identities(AuthenticationConnection *ac, int do_fp) { Key *key; @@ -215,8 +258,39 @@ list_identities(AuthenticationConnection *ac, int do_fp) xfree(comment); } } - if (!had_identities) + if (!had_identities) { printf("The agent has no identities.\n"); + return -1; + } + return 0; +} + +static int +lock_agent(AuthenticationConnection *ac, int lock) +{ + char prompt[100], *p1, *p2; + int passok = 1, ret = -1; + + strlcpy(prompt, "Enter lock password: ", sizeof(prompt)); + p1 = read_passphrase(prompt, RP_ALLOW_STDIN); + if (lock) { + strlcpy(prompt, "Again: ", sizeof prompt); + p2 = read_passphrase(prompt, RP_ALLOW_STDIN); + if (strcmp(p1, p2) != 0) { + fprintf(stderr, "Passwords do not match.\n"); + passok = 0; + } + memset(p2, 0, strlen(p2)); + xfree(p2); + } + if (passok && ssh_lock_agent(ac, lock, p1)) { + fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un"); + ret = 0; + } else + fprintf(stderr, "Failed to %slock agent.\n", lock ? "" : "un"); + memset(p1, 0, strlen(p1)); + xfree(p1); + return (ret); } static int @@ -235,12 +309,16 @@ do_file(AuthenticationConnection *ac, int deleting, char *file) static void usage(void) { - fprintf(stderr, "Usage: %s [options]\n", __progname); + fprintf(stderr, "Usage: %s [options] [file ...]\n", __progname); fprintf(stderr, "Options:\n"); fprintf(stderr, " -l List fingerprints of all identities.\n"); fprintf(stderr, " -L List public key parameters of all identities.\n"); fprintf(stderr, " -d Delete identity.\n"); fprintf(stderr, " -D Delete all identities.\n"); + fprintf(stderr, " -x Lock agent.\n"); + fprintf(stderr, " -X Unlock agent.\n"); + fprintf(stderr, " -t life Set lifetime (in seconds) when adding identities.\n"); + fprintf(stderr, " -c Require confirmation to sign using identities\n"); #ifdef SMARTCARD fprintf(stderr, " -s reader Add key in smartcard reader.\n"); fprintf(stderr, " -e reader Remove key in smartcard reader.\n"); @@ -256,7 +334,10 @@ main(int argc, char **argv) char *sc_reader_id = NULL; int i, ch, deleting = 0, ret = 0; - __progname = get_progname(argv[0]); + /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ + sanitise_stdfd(); + + __progname = ssh_get_progname(argv[0]); init_rng(); seed_rng(); @@ -265,15 +346,24 @@ main(int argc, char **argv) /* At first, get a connection to the authentication agent. */ ac = ssh_get_authentication_connection(); if (ac == NULL) { - fprintf(stderr, "Could not open a connection to your authentication agent.\n"); - exit(1); + fprintf(stderr, + "Could not open a connection to your authentication agent.\n"); + exit(2); } - while ((ch = getopt(argc, argv, "lLdDe:s:")) != -1) { + while ((ch = getopt(argc, argv, "lLcdDxXe:s:t:")) != -1) { switch (ch) { case 'l': case 'L': - list_identities(ac, ch == 'l' ? 1 : 0); + if (list_identities(ac, ch == 'l' ? 1 : 0) == -1) + ret = 1; + goto done; + case 'x': + case 'X': + if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1) + ret = 1; goto done; + case 'c': + confirm = 1; break; case 'd': deleting = 1; @@ -282,7 +372,6 @@ main(int argc, char **argv) if (delete_all(ac) == -1) ret = 1; goto done; - break; case 's': sc_reader_id = optarg; break; @@ -290,6 +379,13 @@ main(int argc, char **argv) deleting = 1; sc_reader_id = optarg; break; + case 't': + if ((lifetime = convtime(optarg)) == -1) { + fprintf(stderr, "Invalid lifetime\n"); + ret = 1; + goto done; + } + break; default: usage(); ret = 1; @@ -306,6 +402,8 @@ main(int argc, char **argv) if (argc == 0) { char buf[MAXPATHLEN]; struct passwd *pw; + struct stat st; + int count = 0; if ((pw = getpwuid(getuid())) == NULL) { fprintf(stderr, "No user found with uid %u\n", @@ -314,14 +412,20 @@ main(int argc, char **argv) goto done; } - for(i = 0; default_files[i]; i++) { - snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, + for (i = 0; default_files[i]; i++) { + snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, default_files[i]); + if (stat(buf, &st) < 0) + continue; if (do_file(ac, deleting, buf) == -1) ret = 1; + else + count++; } + if (count == 0) + ret = 1; } else { - for(i = 0; i < argc; i++) { + for (i = 0; i < argc; i++) { if (do_file(ac, deleting, argv[i]) == -1) ret = 1; }