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Annotation of src/usr.bin/ssh/auth2-none.c, Revision 1.4.4.2

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"
1.4.4.1   brad       26: RCSID("$OpenBSD: auth2-none.c,v 1.6 2003/08/26 09:58:43 markus 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;
                     49:        off_t len, n;
                     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:        }
                     58:        len = st.st_size;
                     59:        banner = xmalloc(len + 1);
                     60:        n = atomicio(read, fd, banner, len);
                     61:        close(fd);
                     62:
                     63:        if (n != len) {
1.4       deraadt    64:                xfree(banner);
1.1       markus     65:                return (NULL);
                     66:        }
                     67:        banner[n] = '\0';
1.3       deraadt    68:
1.1       markus     69:        return (banner);
                     70: }
                     71:
                     72: static void
                     73: userauth_banner(void)
                     74: {
                     75:        char *banner = NULL;
                     76:
                     77:        if (options.banner == NULL || (datafellows & SSH_BUG_BANNER))
                     78:                return;
                     79:
                     80:        if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
                     81:                goto done;
                     82:
                     83:        packet_start(SSH2_MSG_USERAUTH_BANNER);
                     84:        packet_put_cstring(banner);
                     85:        packet_put_cstring("");         /* language, unused */
                     86:        packet_send();
                     87:        debug("userauth_banner: sent");
                     88: done:
                     89:        if (banner)
                     90:                xfree(banner);
                     91: }
                     92:
1.2       markus     93: static int
1.1       markus     94: userauth_none(Authctxt *authctxt)
                     95: {
1.2       markus     96:        none_enabled = 0;
1.1       markus     97:        packet_check_eom();
                     98:        userauth_banner();
1.4.4.1   brad       99:        if (options.password_authentication)
                    100:                return (PRIVSEP(auth_password(authctxt, "")));
                    101:        return (0);
1.1       markus    102: }
1.2       markus    103:
                    104: Authmethod method_none = {
                    105:        "none",
                    106:        userauth_none,
                    107:        &none_enabled
                    108: };