Mercurial > dropbear
annotate fake-rfc2553.h @ 1861:2b3a8026a6ce
Add re-exec for server
This allows ASLR to re-randomize the address
space for every connection, preventing some
vulnerabilities from being exploitable by
repeated probing.
Overhead (memory and time) is yet to be confirmed.
At present this is only enabled on Linux. Other BSD platforms
with fexecve() would probably also work though have not been tested.
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Sun, 30 Jan 2022 10:14:56 +0800 |
| parents | deed0571cacc |
| children |
| rev | line source |
|---|---|
|
589
9fd27bc37807
- Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
Matt Johnston <matt@ucc.asn.au>
parents:
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diff
changeset
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1 /* Taken for Dropbear from OpenSSH 5.5p1 */ |
| 67 | 2 |
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589
9fd27bc37807
- Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
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3 /* $Id: fake-rfc2553.h,v 1.16 2008/07/14 11:37:37 djm Exp $ */ |
| 64 | 4 |
| 5 /* | |
| 6 * Copyright (C) 2000-2003 Damien Miller. All rights reserved. | |
| 7 * Copyright (C) 1999 WIDE Project. All rights reserved. | |
| 8 * | |
| 9 * Redistribution and use in source and binary forms, with or without | |
| 10 * modification, are permitted provided that the following conditions | |
| 11 * are met: | |
| 12 * 1. Redistributions of source code must retain the above copyright | |
| 13 * notice, this list of conditions and the following disclaimer. | |
| 14 * 2. Redistributions in binary form must reproduce the above copyright | |
| 15 * notice, this list of conditions and the following disclaimer in the | |
| 16 * documentation and/or other materials provided with the distribution. | |
| 17 * 3. Neither the name of the project nor the names of its contributors | |
| 18 * may be used to endorse or promote products derived from this software | |
| 19 * without specific prior written permission. | |
| 20 * | |
| 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND | |
| 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE | |
| 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 31 * SUCH DAMAGE. | |
| 32 */ | |
| 33 | |
| 34 /* | |
| 35 * Pseudo-implementation of RFC2553 name / address resolution functions | |
| 36 * | |
| 37 * But these functions are not implemented correctly. The minimum subset | |
| 38 * is implemented for ssh use only. For example, this routine assumes | |
| 39 * that ai_family is AF_INET. Don't use it for another purpose. | |
| 40 */ | |
| 41 | |
|
1036
deed0571cacc
DROPBEAR_ prefix for include guards to avoid collisions
Thorsten Horstmann <thorsten.horstmann@web.de>
parents:
589
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42 #ifndef DROPBEAR_FAKE_RFC2553_H |
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deed0571cacc
DROPBEAR_ prefix for include guards to avoid collisions
Thorsten Horstmann <thorsten.horstmann@web.de>
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589
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43 #define DROPBEAR_FAKE_RFC2553_H |
| 64 | 44 |
| 45 #include "includes.h" | |
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589
9fd27bc37807
- Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
Matt Johnston <matt@ucc.asn.au>
parents:
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diff
changeset
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46 #include <sys/types.h> |
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9fd27bc37807
- Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
Matt Johnston <matt@ucc.asn.au>
parents:
67
diff
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47 #if defined(HAVE_NETDB_H) |
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9fd27bc37807
- Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
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parents:
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48 # include <netdb.h> |
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9fd27bc37807
- Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
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parents:
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diff
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49 #endif |
| 64 | 50 |
| 51 /* | |
| 52 * First, socket and INET6 related definitions | |
| 53 */ | |
| 54 #ifndef HAVE_STRUCT_SOCKADDR_STORAGE | |
| 55 # define _SS_MAXSIZE 128 /* Implementation specific max size */ | |
| 56 # define _SS_PADSIZE (_SS_MAXSIZE - sizeof (struct sockaddr)) | |
| 57 struct sockaddr_storage { | |
| 58 struct sockaddr ss_sa; | |
| 59 char __ss_pad2[_SS_PADSIZE]; | |
| 60 }; | |
| 61 # define ss_family ss_sa.sa_family | |
| 62 #endif /* !HAVE_STRUCT_SOCKADDR_STORAGE */ | |
| 63 | |
| 64 #ifndef IN6_IS_ADDR_LOOPBACK | |
| 65 # define IN6_IS_ADDR_LOOPBACK(a) \ | |
| 66 (((u_int32_t *)(a))[0] == 0 && ((u_int32_t *)(a))[1] == 0 && \ | |
| 67 ((u_int32_t *)(a))[2] == 0 && ((u_int32_t *)(a))[3] == htonl(1)) | |
| 68 #endif /* !IN6_IS_ADDR_LOOPBACK */ | |
| 69 | |
| 70 #ifndef HAVE_STRUCT_IN6_ADDR | |
| 71 struct in6_addr { | |
| 72 u_int8_t s6_addr[16]; | |
| 73 }; | |
| 74 #endif /* !HAVE_STRUCT_IN6_ADDR */ | |
| 75 | |
| 76 #ifndef HAVE_STRUCT_SOCKADDR_IN6 | |
| 77 struct sockaddr_in6 { | |
| 78 unsigned short sin6_family; | |
| 79 u_int16_t sin6_port; | |
| 80 u_int32_t sin6_flowinfo; | |
| 81 struct in6_addr sin6_addr; | |
|
589
9fd27bc37807
- Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
Matt Johnston <matt@ucc.asn.au>
parents:
67
diff
changeset
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82 u_int32_t sin6_scope_id; |
| 64 | 83 }; |
| 84 #endif /* !HAVE_STRUCT_SOCKADDR_IN6 */ | |
| 85 | |
| 86 #ifndef AF_INET6 | |
| 87 /* Define it to something that should never appear */ | |
| 88 #define AF_INET6 AF_MAX | |
| 89 #endif | |
| 90 | |
| 91 /* | |
| 92 * Next, RFC2553 name / address resolution API | |
| 93 */ | |
| 94 | |
| 95 #ifndef NI_NUMERICHOST | |
| 96 # define NI_NUMERICHOST (1) | |
| 97 #endif | |
| 98 #ifndef NI_NAMEREQD | |
| 99 # define NI_NAMEREQD (1<<1) | |
| 100 #endif | |
| 101 #ifndef NI_NUMERICSERV | |
| 102 # define NI_NUMERICSERV (1<<2) | |
| 103 #endif | |
| 104 | |
| 105 #ifndef AI_PASSIVE | |
| 106 # define AI_PASSIVE (1) | |
| 107 #endif | |
| 108 #ifndef AI_CANONNAME | |
| 109 # define AI_CANONNAME (1<<1) | |
| 110 #endif | |
| 111 #ifndef AI_NUMERICHOST | |
| 112 # define AI_NUMERICHOST (1<<2) | |
| 113 #endif | |
| 114 | |
| 115 #ifndef NI_MAXSERV | |
| 116 # define NI_MAXSERV 32 | |
| 117 #endif /* !NI_MAXSERV */ | |
| 118 #ifndef NI_MAXHOST | |
| 119 # define NI_MAXHOST 1025 | |
| 120 #endif /* !NI_MAXHOST */ | |
| 121 | |
| 122 #ifndef EAI_NODATA | |
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123 # define EAI_NODATA (INT_MAX - 1) |
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124 #endif |
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125 #ifndef EAI_MEMORY |
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126 # define EAI_MEMORY (INT_MAX - 2) |
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9fd27bc37807
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parents:
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127 #endif |
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128 #ifndef EAI_NONAME |
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129 # define EAI_NONAME (INT_MAX - 3) |
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9fd27bc37807
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parents:
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130 #endif |
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9fd27bc37807
- Update fake-rfc2553.{c,h} from OpenSSH 5.5p1
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parents:
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131 #ifndef EAI_SYSTEM |
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132 # define EAI_SYSTEM (INT_MAX - 4) |
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parents:
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133 #endif |
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134 #ifndef EAI_FAMILY |
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135 # define EAI_FAMILY (INT_MAX - 5) |
| 64 | 136 #endif |
| 137 | |
| 138 #ifndef HAVE_STRUCT_ADDRINFO | |
| 139 struct addrinfo { | |
| 140 int ai_flags; /* AI_PASSIVE, AI_CANONNAME */ | |
| 141 int ai_family; /* PF_xxx */ | |
| 142 int ai_socktype; /* SOCK_xxx */ | |
| 143 int ai_protocol; /* 0 or IPPROTO_xxx for IPv4 and IPv6 */ | |
| 144 size_t ai_addrlen; /* length of ai_addr */ | |
| 145 char *ai_canonname; /* canonical name for hostname */ | |
| 146 struct sockaddr *ai_addr; /* binary address */ | |
| 147 struct addrinfo *ai_next; /* next structure in linked list */ | |
| 148 }; | |
| 149 #endif /* !HAVE_STRUCT_ADDRINFO */ | |
| 150 | |
| 151 #ifndef HAVE_GETADDRINFO | |
| 152 #ifdef getaddrinfo | |
| 153 # undef getaddrinfo | |
| 154 #endif | |
| 155 #define getaddrinfo(a,b,c,d) (ssh_getaddrinfo(a,b,c,d)) | |
| 156 int getaddrinfo(const char *, const char *, | |
| 157 const struct addrinfo *, struct addrinfo **); | |
| 158 #endif /* !HAVE_GETADDRINFO */ | |
| 159 | |
| 160 #if !defined(HAVE_GAI_STRERROR) && !defined(HAVE_CONST_GAI_STRERROR_PROTO) | |
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parents:
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161 #define gai_strerror(a) (_ssh_compat_gai_strerror(a)) |
| 64 | 162 char *gai_strerror(int); |
| 163 #endif /* !HAVE_GAI_STRERROR */ | |
| 164 | |
| 165 #ifndef HAVE_FREEADDRINFO | |
| 166 #define freeaddrinfo(a) (ssh_freeaddrinfo(a)) | |
| 167 void freeaddrinfo(struct addrinfo *); | |
| 168 #endif /* !HAVE_FREEADDRINFO */ | |
| 169 | |
| 170 #ifndef HAVE_GETNAMEINFO | |
| 171 #define getnameinfo(a,b,c,d,e,f,g) (ssh_getnameinfo(a,b,c,d,e,f,g)) | |
| 172 int getnameinfo(const struct sockaddr *, size_t, char *, size_t, | |
| 173 char *, size_t, int); | |
| 174 #endif /* !HAVE_GETNAMEINFO */ | |
| 175 | |
| 176 #endif /* !_FAKE_RFC2553_H */ | |
| 177 |