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Annotation of src/usr.bin/ssh/auth2-none.c, Revision 1.6.2.1

1.1       markus      1: /*
                      2:  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
                      3:  *
                      4:  * Redistribution and use in source and binary forms, with or without
                      5:  * modification, are permitted provided that the following conditions
                      6:  * are met:
                      7:  * 1. Redistributions of source code must retain the above copyright
                      8:  *    notice, this list of conditions and the following disclaimer.
                      9:  * 2. Redistributions in binary form must reproduce the above copyright
                     10:  *    notice, this list of conditions and the following disclaimer in the
                     11:  *    documentation and/or other materials provided with the distribution.
                     12:  *
                     13:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     14:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     15:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     16:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     17:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     18:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     19:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     20:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     21:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     22:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     23:  */
                     24:
                     25: #include "includes.h"
1.6.2.1 ! brad       26: RCSID("$OpenBSD: auth2-none.c,v 1.7 2004/05/11 19:01:43 deraadt Exp $");
1.1       markus     27:
                     28: #include "auth.h"
                     29: #include "xmalloc.h"
                     30: #include "packet.h"
                     31: #include "log.h"
                     32: #include "servconf.h"
                     33: #include "atomicio.h"
                     34: #include "compat.h"
                     35: #include "ssh2.h"
                     36: #include "monitor_wrap.h"
                     37:
                     38: /* import */
                     39: extern ServerOptions options;
                     40:
1.2       markus     41: /* "none" is allowed only one time */
                     42: static int none_enabled = 1;
                     43:
1.1       markus     44: char *
                     45: auth2_read_banner(void)
                     46: {
                     47:        struct stat st;
                     48:        char *banner = NULL;
1.6.2.1 ! brad       49:        size_t len, n;
1.1       markus     50:        int fd;
                     51:
                     52:        if ((fd = open(options.banner, O_RDONLY)) == -1)
                     53:                return (NULL);
                     54:        if (fstat(fd, &st) == -1) {
                     55:                close(fd);
                     56:                return (NULL);
                     57:        }
1.6.2.1 ! brad       58:        if (st.st_size > 1*1024*1024) {
        !            59:                close(fd);
        !            60:                return (NULL);
        !            61:        }
        !            62:
        !            63:        len = (size_t)st.st_size;               /* truncate */
1.1       markus     64:        banner = xmalloc(len + 1);
                     65:        n = atomicio(read, fd, banner, len);
                     66:        close(fd);
                     67:
                     68:        if (n != len) {
1.4       deraadt    69:                xfree(banner);
1.1       markus     70:                return (NULL);
                     71:        }
                     72:        banner[n] = '\0';
1.3       deraadt    73:
1.1       markus     74:        return (banner);
                     75: }
                     76:
                     77: static void
                     78: userauth_banner(void)
                     79: {
                     80:        char *banner = NULL;
                     81:
                     82:        if (options.banner == NULL || (datafellows & SSH_BUG_BANNER))
                     83:                return;
                     84:
                     85:        if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
                     86:                goto done;
                     87:
                     88:        packet_start(SSH2_MSG_USERAUTH_BANNER);
                     89:        packet_put_cstring(banner);
                     90:        packet_put_cstring("");         /* language, unused */
                     91:        packet_send();
                     92:        debug("userauth_banner: sent");
                     93: done:
                     94:        if (banner)
                     95:                xfree(banner);
                     96: }
                     97:
1.2       markus     98: static int
1.1       markus     99: userauth_none(Authctxt *authctxt)
                    100: {
1.2       markus    101:        none_enabled = 0;
1.1       markus    102:        packet_check_eom();
                    103:        userauth_banner();
1.6       markus    104:        if (options.password_authentication)
1.5       markus    105:                return (PRIVSEP(auth_password(authctxt, "")));
                    106:        return (0);
1.1       markus    107: }
1.2       markus    108:
                    109: Authmethod method_none = {
                    110:        "none",
                    111:        userauth_none,
                    112:        &none_enabled
                    113: };