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Annotation of src/usr.bin/ssh/auth2-none.c, Revision 1.13

1.13    ! dtucker     1: /* $OpenBSD: auth2-none.c,v 1.12 2006/08/03 03:34:41 deraadt Exp $ */
1.1       markus      2: /*
                      3:  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms, with or without
                      6:  * modification, are permitted provided that the following conditions
                      7:  * are met:
                      8:  * 1. Redistributions of source code must retain the above copyright
                      9:  *    notice, this list of conditions and the following disclaimer.
                     10:  * 2. Redistributions in binary form must reproduce the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer in the
                     12:  *    documentation and/or other materials provided with the distribution.
                     13:  *
                     14:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     15:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     16:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     17:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     18:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     19:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     20:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     21:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     22:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     23:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     24:  */
                     25:
1.8       stevesk    26: #include <sys/types.h>
                     27: #include <sys/stat.h>
1.13    ! dtucker    28: #include <sys/uio.h>
1.11      stevesk    29:
                     30: #include <fcntl.h>
1.13    ! dtucker    31: #include <unistd.h>
1.1       markus     32:
1.12      deraadt    33: #include "xmalloc.h"
                     34: #include "key.h"
                     35: #include "hostfile.h"
1.1       markus     36: #include "auth.h"
                     37: #include "packet.h"
                     38: #include "log.h"
1.12      deraadt    39: #include "buffer.h"
1.1       markus     40: #include "servconf.h"
                     41: #include "atomicio.h"
                     42: #include "compat.h"
                     43: #include "ssh2.h"
1.12      deraadt    44: #ifdef GSSAPI
                     45: #include "ssh-gss.h"
                     46: #endif
1.1       markus     47: #include "monitor_wrap.h"
                     48:
                     49: /* import */
                     50: extern ServerOptions options;
                     51:
1.2       markus     52: /* "none" is allowed only one time */
                     53: static int none_enabled = 1;
                     54:
1.1       markus     55: char *
                     56: auth2_read_banner(void)
                     57: {
                     58:        struct stat st;
                     59:        char *banner = NULL;
1.7       deraadt    60:        size_t len, n;
1.1       markus     61:        int fd;
                     62:
                     63:        if ((fd = open(options.banner, O_RDONLY)) == -1)
                     64:                return (NULL);
                     65:        if (fstat(fd, &st) == -1) {
                     66:                close(fd);
                     67:                return (NULL);
                     68:        }
1.7       deraadt    69:        if (st.st_size > 1*1024*1024) {
                     70:                close(fd);
                     71:                return (NULL);
                     72:        }
                     73:
                     74:        len = (size_t)st.st_size;               /* truncate */
1.1       markus     75:        banner = xmalloc(len + 1);
                     76:        n = atomicio(read, fd, banner, len);
                     77:        close(fd);
                     78:
                     79:        if (n != len) {
1.4       deraadt    80:                xfree(banner);
1.1       markus     81:                return (NULL);
                     82:        }
                     83:        banner[n] = '\0';
1.3       deraadt    84:
1.1       markus     85:        return (banner);
                     86: }
                     87:
                     88: static void
                     89: userauth_banner(void)
                     90: {
                     91:        char *banner = NULL;
                     92:
                     93:        if (options.banner == NULL || (datafellows & SSH_BUG_BANNER))
                     94:                return;
                     95:
                     96:        if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
                     97:                goto done;
                     98:
                     99:        packet_start(SSH2_MSG_USERAUTH_BANNER);
                    100:        packet_put_cstring(banner);
                    101:        packet_put_cstring("");         /* language, unused */
                    102:        packet_send();
                    103:        debug("userauth_banner: sent");
                    104: done:
                    105:        if (banner)
                    106:                xfree(banner);
                    107: }
                    108:
1.2       markus    109: static int
1.1       markus    110: userauth_none(Authctxt *authctxt)
                    111: {
1.2       markus    112:        none_enabled = 0;
1.1       markus    113:        packet_check_eom();
                    114:        userauth_banner();
1.6       markus    115:        if (options.password_authentication)
1.5       markus    116:                return (PRIVSEP(auth_password(authctxt, "")));
                    117:        return (0);
1.1       markus    118: }
1.2       markus    119:
                    120: Authmethod method_none = {
                    121:        "none",
                    122:        userauth_none,
                    123:        &none_enabled
                    124: };