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Annotation of src/usr.bin/ssh/auth2-none.c, Revision 1.14

1.14    ! djm         1: /* $OpenBSD: auth2-none.c,v 1.13 2006/08/05 07:52:52 dtucker 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>
1.14    ! djm        32: #include <string.h>
1.1       markus     33:
1.12      deraadt    34: #include "xmalloc.h"
                     35: #include "key.h"
                     36: #include "hostfile.h"
1.1       markus     37: #include "auth.h"
                     38: #include "packet.h"
                     39: #include "log.h"
1.12      deraadt    40: #include "buffer.h"
1.1       markus     41: #include "servconf.h"
                     42: #include "atomicio.h"
                     43: #include "compat.h"
                     44: #include "ssh2.h"
1.12      deraadt    45: #ifdef GSSAPI
                     46: #include "ssh-gss.h"
                     47: #endif
1.1       markus     48: #include "monitor_wrap.h"
                     49:
                     50: /* import */
                     51: extern ServerOptions options;
                     52:
1.2       markus     53: /* "none" is allowed only one time */
                     54: static int none_enabled = 1;
                     55:
1.1       markus     56: char *
                     57: auth2_read_banner(void)
                     58: {
                     59:        struct stat st;
                     60:        char *banner = NULL;
1.7       deraadt    61:        size_t len, n;
1.1       markus     62:        int fd;
                     63:
                     64:        if ((fd = open(options.banner, O_RDONLY)) == -1)
                     65:                return (NULL);
                     66:        if (fstat(fd, &st) == -1) {
                     67:                close(fd);
                     68:                return (NULL);
                     69:        }
1.7       deraadt    70:        if (st.st_size > 1*1024*1024) {
                     71:                close(fd);
                     72:                return (NULL);
                     73:        }
                     74:
                     75:        len = (size_t)st.st_size;               /* truncate */
1.1       markus     76:        banner = xmalloc(len + 1);
                     77:        n = atomicio(read, fd, banner, len);
                     78:        close(fd);
                     79:
                     80:        if (n != len) {
1.4       deraadt    81:                xfree(banner);
1.1       markus     82:                return (NULL);
                     83:        }
                     84:        banner[n] = '\0';
1.3       deraadt    85:
1.1       markus     86:        return (banner);
                     87: }
                     88:
                     89: static void
                     90: userauth_banner(void)
                     91: {
                     92:        char *banner = NULL;
                     93:
1.14    ! djm        94:        if (options.banner == NULL ||
        !            95:            strcasecmp(options.banner, "none") == 0 ||
        !            96:            (datafellows & SSH_BUG_BANNER) != 0)
1.1       markus     97:                return;
                     98:
                     99:        if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
                    100:                goto done;
                    101:
                    102:        packet_start(SSH2_MSG_USERAUTH_BANNER);
                    103:        packet_put_cstring(banner);
                    104:        packet_put_cstring("");         /* language, unused */
                    105:        packet_send();
                    106:        debug("userauth_banner: sent");
                    107: done:
                    108:        if (banner)
                    109:                xfree(banner);
                    110: }
                    111:
1.2       markus    112: static int
1.1       markus    113: userauth_none(Authctxt *authctxt)
                    114: {
1.2       markus    115:        none_enabled = 0;
1.1       markus    116:        packet_check_eom();
                    117:        userauth_banner();
1.6       markus    118:        if (options.password_authentication)
1.5       markus    119:                return (PRIVSEP(auth_password(authctxt, "")));
                    120:        return (0);
1.1       markus    121: }
1.2       markus    122:
                    123: Authmethod method_none = {
                    124:        "none",
                    125:        userauth_none,
                    126:        &none_enabled
                    127: };