author | Tomas Kuthan <tomas.kuthan@oracle.com> |
Fri, 04 Nov 2016 09:14:49 -0700 | |
changeset 7246 | b3414fa83399 |
parent 5490 | 9bf0bc57423a |
permissions | -rw-r--r-- |
5490
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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */ |
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/* |
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* Copyright 1993 by OpenVision Technologies, Inc. |
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* |
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* Permission to use, copy, modify, distribute, and sell this software |
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* and its documentation for any purpose is hereby granted without fee, |
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* provided that the above copyright notice appears in all copies and |
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* that both that copyright notice and this permission notice appear in |
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* supporting documentation, and that the name of OpenVision not be used |
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* in advertising or publicity pertaining to distribution of the software |
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* without specific, written prior permission. OpenVision makes no |
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* representations about the suitability of this software for any |
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* purpose. It is provided "as is" without express or implied warranty. |
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* |
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* OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
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* EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF |
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* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR |
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
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* PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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|
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/* |
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* Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved. |
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*/ |
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|
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/* |
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* $Id: util_ordering.c 23457 2009-12-08 00:04:48Z tlyu $ |
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*/ |
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|
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/* |
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* functions to check sequence numbers for replay and sequencing |
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*/ |
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|
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#include "gssapiP_generic.h" |
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#include <string.h> |
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#define QUEUE_LENGTH 20 |
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typedef struct _queue { |
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int do_replay; |
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int do_sequence; |
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int start; |
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int length; |
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uint64_t firstnum; |
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/* Stored as deltas from firstnum. This way, the high bit won't |
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overflow unless we've actually gone through 2**n messages, or |
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gotten something *way* out of sequence. */ |
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uint64_t elem[QUEUE_LENGTH]; |
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/* All ones for 64-bit sequence numbers; 32 ones for 32-bit |
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sequence numbers. */ |
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uint64_t mask; |
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} queue; |
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|
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/* rep invariant: |
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* - the queue is a circular queue. The first element (q->elem[q->start]) |
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* is the oldest. The last element is the newest. |
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*/ |
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#define QSIZE(q) (sizeof((q)->elem)/sizeof((q)->elem[0])) |
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#define QELEM(q,i) ((q)->elem[(i)%QSIZE(q)]) |
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|
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/* |
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* Solaris Kerberos: begin |
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* mask(max) is 2 ** 64 - 1, and half is 2 ** 63. |
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* |-------------------------------|-----------------------------| |
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* 0 half mask |
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* |-------------------------------| |
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* half range ( 2 ** 63 ) |
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* |
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* Here, the distance between n1 and n2 is used, if it falls |
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* in the "half range", normal integer comparison is enough. |
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* |
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* If the distance is bigger than half of the range, one of them must |
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* have passed the 'mask' point while the other one didn't. In this |
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* case, the result should be the reverse of normal comparison, i.e. |
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* the smaller one is considered bigger. |
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* |
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* If we shift the smaller value by adding 'mask' to it, |
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* the distance will be in half range again. |
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* |
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* The assumption is that the out of order event will not |
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* happen too often. If the distance is really bigger than half range, |
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* (1 is expected, but half + 2 arrives) we really don't know if it's a |
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* GAP token or an OLD token that wrapped. |
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*/ |
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static int |
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after(uint64_t n1, uint64_t n2, uint64_t mask) |
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{ |
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int bigger; |
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uint64_t diff; |
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uint64_t half; |
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|
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/* |
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* rule 1: same number. |
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* This may be ambiguous, but the caller of this function, |
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* g_order_check already takes care of it. |
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*/ |
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if (n1 == n2) |
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return (0); |
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|
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half = 1 + (mask >> 1); |
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|
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if (n1 > n2) { |
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diff = n1 - n2; |
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bigger = 1; |
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} else { |
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diff = n2 - n1; |
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bigger = 0; |
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} |
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|
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/* rule 2: in the same half range, normal comparison is enough */ |
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114 |
if (diff < half) |
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115 |
return bigger; |
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|
116 |
|
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117 |
n1 &= half; |
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118 |
|
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119 |
/* rule 3: different half, and n1 is on upper, n2 is bigger */ |
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120 |
/* rule 4: different half, and n1 is on lower, n1 is bigger */ |
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121 |
if (n1 != 0) |
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122 |
return (0); |
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123 |
|
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124 |
return (1); |
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125 |
} |
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126 |
/* Solaris Kerberos: end */ |
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127 |
|
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128 |
static void |
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129 |
queue_insert(queue *q, int after, uint64_t seqnum) |
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130 |
{ |
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131 |
/* insert. this is not the fastest way, but it's easy, and it's |
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optimized for insert at end, which is the common case */ |
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133 |
int i; |
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134 |
|
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135 |
/* common case: at end, after == q->start+q->length-1 */ |
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136 |
|
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137 |
/* move all the elements (after,last] up one slot */ |
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138 |
|
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139 |
for (i=q->start+q->length-1; i>after; i--) |
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QELEM(q,i+1) = QELEM(q,i); |
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141 |
|
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142 |
/* fill in slot after+1 */ |
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143 |
|
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144 |
QELEM(q,after+1) = seqnum; |
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|
145 |
|
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146 |
/* Either increase the length by one, or move the starting point up |
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147 |
one (deleting the first element, which got bashed above), as |
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148 |
appropriate. */ |
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149 |
|
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150 |
if (q->length == QSIZE(q)) { |
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151 |
q->start++; |
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152 |
if (q->start == QSIZE(q)) |
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153 |
q->start = 0; |
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154 |
} else { |
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155 |
q->length++; |
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156 |
} |
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157 |
} |
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|
158 |
|
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159 |
gss_int32 |
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160 |
g_order_init(void **vqueue, uint64_t seqnum, |
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161 |
int do_replay, int do_sequence, int wide_nums) |
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|
162 |
{ |
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163 |
queue *q; |
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|
164 |
|
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165 |
if ((q = (queue *) malloc(sizeof(queue))) == NULL) |
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166 |
return(ENOMEM); |
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|
167 |
|
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168 |
/* This stops valgrind from complaining about writing uninitialized |
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169 |
data if the caller exports the context and writes it to a file. |
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170 |
We don't actually use those bytes at all, but valgrind still |
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171 |
complains. */ |
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|
172 |
(void) memset(q, 0xfe, sizeof(*q)); |
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|
173 |
|
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|
174 |
q->do_replay = do_replay; |
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|
175 |
q->do_sequence = do_sequence; |
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|
176 |
q->mask = wide_nums ? ~(uint64_t)0 : 0xffffffffUL; |
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|
177 |
|
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|
178 |
q->start = 0; |
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|
179 |
q->length = 1; |
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|
180 |
q->firstnum = seqnum; |
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|
181 |
q->elem[q->start] = ((uint64_t)0 - 1) & q->mask; |
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|
182 |
|
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parents:
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|
183 |
*vqueue = (void *) q; |
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|
184 |
return(0); |
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parents:
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|
185 |
} |
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|
186 |
|
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|
187 |
gss_int32 |
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|
188 |
g_order_check(void **vqueue, uint64_t seqnum) |
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|
189 |
{ |
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parents:
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|
190 |
queue *q; |
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|
191 |
int i; |
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|
192 |
uint64_t expected; |
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|
193 |
|
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parents:
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|
194 |
q = (queue *) (*vqueue); |
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|
195 |
|
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|
196 |
if (!q->do_replay && !q->do_sequence) |
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|
197 |
return(GSS_S_COMPLETE); |
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|
198 |
|
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|
199 |
/* All checks are done relative to the initial sequence number, to |
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|
200 |
avoid (or at least put off) the pain of wrapping. */ |
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parents:
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|
201 |
seqnum -= q->firstnum; |
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parents:
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|
202 |
/* If we're only doing 32-bit values, adjust for that again. |
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|
203 |
|
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|
204 |
Note that this will probably be the wrong thing to if we get |
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|
205 |
2**32 messages sent with 32-bit sequence numbers. */ |
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parents:
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|
206 |
seqnum &= q->mask; |
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|
207 |
|
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parents:
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|
208 |
/* rule 1: expected sequence number */ |
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|
209 |
|
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|
210 |
expected = (QELEM(q,q->start+q->length-1)+1) & q->mask; |
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|
211 |
if (seqnum == expected) { |
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|
212 |
queue_insert(q, q->start+q->length-1, seqnum); |
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|
213 |
return(GSS_S_COMPLETE); |
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|
214 |
} |
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|
215 |
|
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parents:
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|
216 |
/* rule 2: > expected sequence number */ |
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|
217 |
|
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parents:
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|
218 |
/* Solaris Kerberos: using after */ |
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parents:
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|
219 |
if (after(seqnum, expected, q->mask)) { |
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|
220 |
queue_insert(q, q->start+q->length-1, seqnum); |
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parents:
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|
221 |
if (q->do_replay && !q->do_sequence) |
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|
222 |
return(GSS_S_COMPLETE); |
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|
223 |
else |
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parents:
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|
224 |
return(GSS_S_GAP_TOKEN); |
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parents:
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|
225 |
} |
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parents:
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|
226 |
|
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parents:
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|
227 |
/* rule 3: seqnum < seqnum(first) */ |
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|
228 |
|
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parents:
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|
229 |
/* Solaris Kerberos */ |
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parents:
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changeset
|
230 |
if (after(QELEM(q,q->start), seqnum, q->mask)) { |
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231 |
if (q->do_replay && !q->do_sequence) |
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232 |
return(GSS_S_OLD_TOKEN); |
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233 |
else |
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|
234 |
return(GSS_S_UNSEQ_TOKEN); |
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235 |
} |
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|
236 |
|
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|
237 |
/* rule 4+5: seqnum in [seqnum(first),seqnum(last)] */ |
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|
238 |
|
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|
239 |
else { |
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parents:
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|
240 |
if (seqnum == QELEM(q,q->start+q->length-1)) |
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parents:
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|
241 |
return(GSS_S_DUPLICATE_TOKEN); |
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|
242 |
|
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|
243 |
for (i=q->start; i<q->start+q->length-1; i++) { |
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|
244 |
if (seqnum == QELEM(q,i)) |
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parents:
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|
245 |
return(GSS_S_DUPLICATE_TOKEN); |
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|
246 |
/* Solaris Kerberos */ |
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|
247 |
if (after(seqnum, QELEM(q,i), q->mask) && |
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|
248 |
after(QELEM(q,i+1), seqnum, q->mask)) { |
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|
249 |
queue_insert(q, i, seqnum); |
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parents:
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|
250 |
if (q->do_replay && !q->do_sequence) |
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parents:
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|
251 |
return(GSS_S_COMPLETE); |
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|
252 |
else |
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|
253 |
return(GSS_S_UNSEQ_TOKEN); |
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parents:
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|
254 |
} |
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parents:
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|
255 |
} |
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parents:
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|
256 |
} |
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|
257 |
|
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|
258 |
/* this should never happen */ |
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|
259 |
return(GSS_S_FAILURE); |
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|
260 |
} |
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|
261 |
|
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parents:
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|
262 |
void |
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|
263 |
g_order_free(void **vqueue) |
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|
264 |
{ |
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|
265 |
queue *q; |
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|
266 |
|
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parents:
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|
267 |
q = (queue *) (*vqueue); |
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parents:
diff
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|
268 |
|
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parents:
diff
changeset
|
269 |
free(q); |
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parents:
diff
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|
270 |
|
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parents:
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|
271 |
*vqueue = NULL; |
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parents:
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|
272 |
} |
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parents:
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|
273 |
|
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parents:
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|
274 |
/* |
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|
275 |
* These support functions are for the serialization routines |
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parents:
diff
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|
276 |
*/ |
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parents:
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changeset
|
277 |
/* ARGSUSED */ |
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parents:
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|
278 |
gss_uint32 |
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parents:
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|
279 |
g_queue_size(void *vqueue, size_t *sizep) |
9bf0bc57423a
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parents:
diff
changeset
|
280 |
{ |
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parents:
diff
changeset
|
281 |
*sizep += sizeof(queue); |
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PSARC/2015/144 Kerberos 1.13 Delivery to Userland
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parents:
diff
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|
282 |
return 0; |
9bf0bc57423a
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parents:
diff
changeset
|
283 |
} |
9bf0bc57423a
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parents:
diff
changeset
|
284 |
|
9bf0bc57423a
PSARC/2015/144 Kerberos 1.13 Delivery to Userland
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parents:
diff
changeset
|
285 |
gss_uint32 |
9bf0bc57423a
PSARC/2015/144 Kerberos 1.13 Delivery to Userland
Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
286 |
g_queue_externalize(void *vqueue, unsigned char **buf, size_t *lenremain) |
9bf0bc57423a
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parents:
diff
changeset
|
287 |
{ |
9bf0bc57423a
PSARC/2015/144 Kerberos 1.13 Delivery to Userland
Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
288 |
if (*lenremain < sizeof(queue)) |
9bf0bc57423a
PSARC/2015/144 Kerberos 1.13 Delivery to Userland
Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
289 |
return ENOMEM; |
9bf0bc57423a
PSARC/2015/144 Kerberos 1.13 Delivery to Userland
Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
290 |
(void) memcpy(*buf, vqueue, sizeof(queue)); |
9bf0bc57423a
PSARC/2015/144 Kerberos 1.13 Delivery to Userland
Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
291 |
*buf += sizeof(queue); |
9bf0bc57423a
PSARC/2015/144 Kerberos 1.13 Delivery to Userland
Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
292 |
*lenremain -= sizeof(queue); |
9bf0bc57423a
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parents:
diff
changeset
|
293 |
|
9bf0bc57423a
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Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
294 |
return 0; |
9bf0bc57423a
PSARC/2015/144 Kerberos 1.13 Delivery to Userland
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parents:
diff
changeset
|
295 |
} |
9bf0bc57423a
PSARC/2015/144 Kerberos 1.13 Delivery to Userland
Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
296 |
|
9bf0bc57423a
PSARC/2015/144 Kerberos 1.13 Delivery to Userland
Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
297 |
gss_uint32 |
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Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
298 |
g_queue_internalize(void **vqueue, unsigned char **buf, size_t *lenremain) |
9bf0bc57423a
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Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
299 |
{ |
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Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
300 |
void *q; |
9bf0bc57423a
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Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
301 |
|
9bf0bc57423a
PSARC/2015/144 Kerberos 1.13 Delivery to Userland
Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
302 |
if (*lenremain < sizeof(queue)) |
9bf0bc57423a
PSARC/2015/144 Kerberos 1.13 Delivery to Userland
Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
303 |
return EINVAL; |
9bf0bc57423a
PSARC/2015/144 Kerberos 1.13 Delivery to Userland
Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
304 |
if ((q = malloc(sizeof(queue))) == 0) |
9bf0bc57423a
PSARC/2015/144 Kerberos 1.13 Delivery to Userland
Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
305 |
return ENOMEM; |
9bf0bc57423a
PSARC/2015/144 Kerberos 1.13 Delivery to Userland
Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
306 |
(void) memcpy(q, *buf, sizeof(queue)); |
9bf0bc57423a
PSARC/2015/144 Kerberos 1.13 Delivery to Userland
Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
307 |
*buf += sizeof(queue); |
9bf0bc57423a
PSARC/2015/144 Kerberos 1.13 Delivery to Userland
Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
308 |
*lenremain -= sizeof(queue); |
9bf0bc57423a
PSARC/2015/144 Kerberos 1.13 Delivery to Userland
Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
309 |
*vqueue = q; |
9bf0bc57423a
PSARC/2015/144 Kerberos 1.13 Delivery to Userland
Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
310 |
return 0; |
9bf0bc57423a
PSARC/2015/144 Kerberos 1.13 Delivery to Userland
Will Fiveash <will.fiveash@oracle.com>
parents:
diff
changeset
|
311 |
} |