mirror of https://github.com/sudo-project/sudo.git
84 lines
3.1 KiB
C
84 lines
3.1 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2013-2018 Todd C. Miller <Todd.Miller@sudo.ws>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* This is an open source non-commercial project. Dear PVS-Studio, please check it.
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* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
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*/
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#include <config.h>
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#include <sudoers.h>
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/*
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* Derived from code with the following declaration:
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* PUBLIC DOMAIN - Jon Mayo - November 13, 2003
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*/
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static const unsigned char base64dec_tab[256]= {
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255, 62,255,255,255, 63,
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52, 53, 54, 55, 56, 57, 58, 59, 60, 61,255,255,255, 0,255,255,
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255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
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15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,255,255,255,255,255,
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255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
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41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
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};
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/*
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* Decode a NUL-terminated string in base64 format and store the
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* result in dst.
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*/
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size_t
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base64_decode(const char * restrict in, unsigned char * restrict out, size_t out_size)
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{
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unsigned char *out_end = out + out_size;
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const unsigned char *out0 = out;
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unsigned int rem, v;
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debug_decl(base64_decode, SUDOERS_DEBUG_MATCH);
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for (v = 0, rem = 0; *in != '\0' && *in != '='; in++) {
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unsigned char ch = base64dec_tab[(unsigned char)*in];
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if (ch == 255)
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debug_return_size_t((size_t)-1);
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v = (v << 6) | ch;
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rem += 6;
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if (rem >= 8) {
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rem -= 8;
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if (out >= out_end)
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debug_return_size_t((size_t)-1);
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*out++ = (v >> rem) & 0xff;
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}
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}
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if (rem >= 8) {
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if (out >= out_end)
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debug_return_size_t((size_t)-1);
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*out++ = (v >> rem) & 0xff;
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}
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debug_return_size_t((size_t)(out - out0));
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}
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