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Annotation of src/usr.bin/ssh/compat.c, Revision 1.24

1.5       markus      1: /*
1.23      markus      2:  * Copyright (c) 1999,2000 Markus Friedl.  All rights reserved.
1.5       markus      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:
1.1       markus     25: #include "includes.h"
1.24    ! markus     26: RCSID("$OpenBSD: compat.c,v 1.23 2000/09/07 21:13:37 markus Exp $");
1.2       markus     27:
1.1       markus     28: #include "ssh.h"
1.6       markus     29: #include "packet.h"
1.10      markus     30: #include "xmalloc.h"
                     31: #include "compat.h"
1.24    ! markus     32: #include <regex.h>
1.1       markus     33:
1.4       markus     34: int compat13 = 0;
1.6       markus     35: int compat20 = 0;
                     36: int datafellows = 0;
1.4       markus     37:
1.11      markus     38: void
1.6       markus     39: enable_compat20(void)
                     40: {
1.7       markus     41:        verbose("Enabling compatibility mode for protocol 2.0");
                     42:        compat20 = 1;
1.6       markus     43: }
1.11      markus     44: void
1.4       markus     45: enable_compat13(void)
                     46: {
1.3       markus     47:        verbose("Enabling compatibility mode for protocol 1.3");
1.4       markus     48:        compat13 = 1;
1.6       markus     49: }
                     50: /* datafellows bug compatibility */
                     51: void
                     52: compat_datafellows(const char *version)
                     53: {
1.24    ! markus     54:        int i, ret;
        !            55:        char ebuf[1024];
        !            56:        regex_t reg;
        !            57:        static struct {
        !            58:                char    *pat;
1.13      markus     59:                int     bugs;
                     60:        } check[] = {
1.24    ! markus     61:                {"^.*MindTerm",         0},
        !            62:                {"^2\\.1\\.0 ",         SSH_BUG_SIGBLOB|SSH_BUG_HMAC},
        !            63:                {"^2\\.0\\.",           SSH_BUG_SIGBLOB|SSH_BUG_HMAC|SSH_BUG_PUBKEYAUTH|SSH_BUG_X11FWD},
        !            64:                {"^2\\.[23]\\.0 ",      SSH_BUG_HMAC|SSH_COMPAT_SESSIONID_ENCODING},
        !            65:                {"^2\\.[2-9]\\.",       SSH_COMPAT_SESSIONID_ENCODING},
        !            66:                {"^2\\.",               SSH_BUG_HMAC|SSH_COMPAT_SESSIONID_ENCODING},
        !            67:                {NULL,                  0}
1.6       markus     68:        };
1.21      markus     69:        /* process table, return first match */
1.24    ! markus     70:        for (i = 0; check[i].pat; i++) {
        !            71:                ret = regcomp(&reg, check[i].pat, REG_EXTENDED|REG_NOSUB);
        !            72:                if (ret != 0) {
        !            73:                        regerror(ret, &reg, ebuf, sizeof(ebuf));
        !            74:                        ebuf[sizeof(ebuf)-1] = '\0';
        !            75:                        error("regerror: %s", ebuf);
        !            76:                        continue;
        !            77:                }
        !            78:                ret = regexec(&reg, version, 0, NULL, 0);
        !            79:                regfree(&reg);
        !            80:                if (ret == 0) {
        !            81:                        debug("match: %s pat %s\n", version, check[i].pat);
1.13      markus     82:                        datafellows = check[i].bugs;
1.6       markus     83:                        return;
                     84:                }
                     85:        }
1.24    ! markus     86:        debug("no match: %s", version);
1.10      markus     87: }
                     88:
                     89: #define        SEP     ","
                     90: int
                     91: proto_spec(const char *spec)
                     92: {
1.18      provos     93:        char *s, *p, *q;
1.10      markus     94:        int ret = SSH_PROTO_UNKNOWN;
                     95:
1.14      markus     96:        if (spec == NULL)
                     97:                return ret;
1.18      provos     98:        q = s = xstrdup(spec);
1.19      ho         99:        for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
1.10      markus    100:                switch(atoi(p)) {
                    101:                case 1:
                    102:                        if (ret == SSH_PROTO_UNKNOWN)
                    103:                                ret |= SSH_PROTO_1_PREFERRED;
                    104:                        ret |= SSH_PROTO_1;
                    105:                        break;
                    106:                case 2:
                    107:                        ret |= SSH_PROTO_2;
                    108:                        break;
                    109:                default:
                    110:                        log("ignoring bad proto spec: '%s'.", p);
                    111:                        break;
                    112:                }
                    113:        }
                    114:        xfree(s);
                    115:        return ret;
1.1       markus    116: }