Return to auth2-none.c CVS log

Up to [local] / src / usr.bin / ssh

Annotation of src/usr.bin/ssh/auth2-none.c, Revision 1.9

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"
1.8       stevesk    26:
                     27: #include <sys/types.h>
                     28: #include <sys/stat.h>
1.1       markus     29:
                     30: #include "auth.h"
                     31: #include "xmalloc.h"
                     32: #include "packet.h"
                     33: #include "log.h"
                     34: #include "servconf.h"
                     35: #include "atomicio.h"
                     36: #include "compat.h"
                     37: #include "ssh2.h"
                     38: #include "monitor_wrap.h"
                     39:
                     40: /* import */
                     41: extern ServerOptions options;
                     42:
1.2       markus     43: /* "none" is allowed only one time */
                     44: static int none_enabled = 1;
                     45:
1.1       markus     46: char *
                     47: auth2_read_banner(void)
                     48: {
                     49:        struct stat st;
                     50:        char *banner = NULL;
1.7       deraadt    51:        size_t len, n;
1.1       markus     52:        int fd;
                     53:
                     54:        if ((fd = open(options.banner, O_RDONLY)) == -1)
                     55:                return (NULL);
                     56:        if (fstat(fd, &st) == -1) {
                     57:                close(fd);
                     58:                return (NULL);
                     59:        }
1.7       deraadt    60:        if (st.st_size > 1*1024*1024) {
                     61:                close(fd);
                     62:                return (NULL);
                     63:        }
                     64:
                     65:        len = (size_t)st.st_size;               /* truncate */
1.1       markus     66:        banner = xmalloc(len + 1);
                     67:        n = atomicio(read, fd, banner, len);
                     68:        close(fd);
                     69:
                     70:        if (n != len) {
1.4       deraadt    71:                xfree(banner);
1.1       markus     72:                return (NULL);
                     73:        }
                     74:        banner[n] = '\0';
1.3       deraadt    75:
1.1       markus     76:        return (banner);
                     77: }
                     78:
                     79: static void
                     80: userauth_banner(void)
                     81: {
                     82:        char *banner = NULL;
                     83:
                     84:        if (options.banner == NULL || (datafellows & SSH_BUG_BANNER))
                     85:                return;
                     86:
                     87:        if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
                     88:                goto done;
                     89:
                     90:        packet_start(SSH2_MSG_USERAUTH_BANNER);
                     91:        packet_put_cstring(banner);
                     92:        packet_put_cstring("");         /* language, unused */
                     93:        packet_send();
                     94:        debug("userauth_banner: sent");
                     95: done:
                     96:        if (banner)
                     97:                xfree(banner);
                     98: }
                     99:
1.2       markus    100: static int
1.1       markus    101: userauth_none(Authctxt *authctxt)
                    102: {
1.2       markus    103:        none_enabled = 0;
1.1       markus    104:        packet_check_eom();
                    105:        userauth_banner();
1.6       markus    106:        if (options.password_authentication)
1.5       markus    107:                return (PRIVSEP(auth_password(authctxt, "")));
                    108:        return (0);
1.1       markus    109: }
1.2       markus    110:
                    111: Authmethod method_none = {
                    112:        "none",
                    113:        userauth_none,
                    114:        &none_enabled
                    115: };