/*** This file is part of systemd. Copyright 2010 Lennart Poettering systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <ctype.h> #include <errno.h> #include <stdint.h> #include <stdlib.h> #include "alloc-util.h" #include "hexdecoct.h" #include "macro.h" #include "util.h" char octchar(int x) { return '0' + (x & 7); } int unoctchar(char c) { if (c >= '0' && c <= '7') return c - '0'; return -EINVAL; } char decchar(int x) { return '0' + (x % 10); } int undecchar(char c) { if (c >= '0' && c <= '9') return c - '0'; return -EINVAL; } char hexchar(int x) { static const char table[16] = "0123456789abcdef"; return table[x & 15]; } int unhexchar(char c) { if (c >= '0' && c <= '9') return c - '0'; if (c >= 'a' && c <= 'f') return c - 'a' + 10; if (c >= 'A' && c <= 'F') return c - 'A' + 10; return -EINVAL; } char *hexmem(const void *p, size_t l) { char *r, *z; const uint8_t *x; z = r = malloc(l * 2 + 1); if (!r) return NULL; for (x = p; x < (const uint8_t*) p + l; x++) { *(z++) = hexchar(*x >> 4); *(z++) = hexchar(*x & 15); } *z = 0; return r; } int unhexmem(const char *p, size_t l, void **mem, size_t *len) { _cleanup_free_ uint8_t *r = NULL; uint8_t *z; const char *x; assert(mem); assert(len); assert(p); z = r = malloc((l + 1) / 2 + 1); if (!r) return -ENOMEM; for (x = p; x < p + l; x += 2) { int a, b; a = unhexchar(x[0]); if (a < 0) return a; else if (x+1 < p + l) { b = unhexchar(x[1]); if (b < 0) return b; } else b = 0; *(z++) = (uint8_t) a << 4 | (uint8_t) b; } *z = 0; *mem = r; r = NULL; *len = (l + 1) / 2; return 0; } /* https://tools.ietf.org/html/rfc4648#section-6 * Notice that base32hex differs from base32 in the alphabet it uses. * The distinction is that the base32hex representation preserves the * order of the underlying data when compared as bytestrings, this is * useful when representing NSEC3 hashes, as one can then verify the * order of hashes directly from their representation. */ char base32hexchar(int x) { static const char table[32] = "0123456789" "ABCDEFGHIJKLMNOPQRSTUV"; return table[x & 31]; } int unbase32hexchar(char c) { unsigned offset; if (c >= '0' && c <= '9') return c - '0'; offset = '9' - '0' + 1; if (c >= 'A' && c <= 'V') return c - 'A' + offset; return -EINVAL; } char *base32hexmem(const void *p, size_t l, bool padding) { char *r, *z; const uint8_t *x; size_t len; if (padding) /* five input bytes makes eight output bytes, padding is added so we must round up */ len = 8 * (l + 4) / 5; else { /* same, but round down as there is no padding */ len = 8 * l / 5; switch (l % 5) { case 4: len += 7; break; case 3: len += 5; break; case 2: len += 4; break; case 1: len += 2; break; } } z = r = malloc(len + 1); if (!r) return NULL; for (x = p; x < (const uint8_t*) p + (l / 5) * 5; x += 5) { /* x[0] == XXXXXXXX; x[1] == YYYYYYYY; x[2] == ZZZZZZZZ x[3] == QQQQQQQQ; x[4] == WWWWWWWW */ *(z++) = base32hexchar(x[0] >> 3); /* 000XXXXX */ *(z++) = base32hexchar((x[0] & 7) << 2 | x[1] >> 6); /* 000XXXYY */ *(z++) = base32hexchar((x[1] & 63) >> 1); /* 000YYYYY */ *(z++) = base32hexchar((x[1] & 1) << 4 | x[2] >> 4); /* 000YZZZZ */ *(z++) = base32hexchar((x[2] & 15) << 1 | x[3] >> 7); /* 000ZZZZQ */ *(z++) = base32hexchar((x[3] & 127) >> 2); /* 000QQQQQ */ *(z++) = base32hexchar((x[3] & 3) << 3 | x[4] >> 5); /* 000QQWWW */ *(z++) = base32hexchar((x[4] & 31)); /* 000WWWWW */ } switch (l % 5) { case 4: *(z++) = base32hexchar(x[0] >> 3); /* 000XXXXX */ *(z++) = base32hexchar((x[0] & 7) << 2 | x[1] >> 6); /* 000XXXYY */ *(z++) = base32hexchar((x[1] & 63) >> 1); /* 000YYYYY */ *(z++) = base32hexchar((x[1] & 1) << 4 | x[2] >> 4); /* 000YZZZZ */ *(z++) = base32hexchar((x[2] & 15) << 1 | x[3] >> 7); /* 000ZZZZQ */ *(z++) = base32hexchar((x[3] & 127) >> 2); /* 000QQQQQ */ *(z++) = base32hexchar((x[3] & 3) << 3); /* 000QQ000 */ if (padding) *(z++) = '='; break; case 3: *(z++) = base32hexchar(x[0] >> 3); /* 000XXXXX */ *(z++) = base32hexchar((x[0] & 7) << 2 | x[1] >> 6); /* 000XXXYY */ *(z++) = base32hexchar((x[1] & 63) >> 1); /* 000YYYYY */ *(z++) = base32hexchar((x[1] & 1) << 4 | x[2] >> 4); /* 000YZZZZ */ *(z++) = base32hexchar((x[2] & 15) << 1); /* 000ZZZZ0 */ if (padding) { *(z++) = '='; *(z++) = '='; *(z++) = '='; } break; case 2: *(z++) = base32hexchar(x[0] >> 3); /* 000XXXXX */ *(z++) = base32hexchar((x[0] & 7) << 2 | x[1] >> 6); /* 000XXXYY */ *(z++) = base32hexchar((x[1] & 63) >> 1); /* 000YYYYY */ *(z++) = base32hexchar((x[1] & 1) << 4); /* 000Y0000 */ if (padding) { *(z++) = '='; *(z++) = '='; *(z++) = '='; *(z++) = '='; } break; case 1: *(z++) = base32hexchar(x[0] >> 3); /* 000XXXXX */ *(z++) = base32hexchar((x[0] & 7) << 2); /* 000XXX00 */ if (padding) { *(z++) = '='; *(z++) = '='; *(z++) = '='; *(z++) = '='; *(z++) = '='; *(z++) = '='; } break; } *z = 0; return r; } int unbase32hexmem(const char *p, size_t l, bool padding, void **mem, size_t *_len) { _cleanup_free_ uint8_t *r = NULL; int a, b, c, d, e, f, g, h; uint8_t *z; const char *x; size_t len; unsigned pad = 0; assert(p); /* padding ensures any base32hex input has input divisible by 8 */ if (padding && l % 8 != 0) return -EINVAL; if (padding) { /* strip the padding */ while (l > 0 && p[l - 1] == '=' && pad < 7) { pad++; l--; } } /* a group of eight input bytes needs five output bytes, in case of padding we need to add some extra bytes */ len = (l / 8) * 5; switch (l % 8) { case 7: len += 4; break; case 5: len += 3; break; case 4: len += 2; break; case 2: len += 1; break; case 0: break; default: return -EINVAL; } z = r = malloc(len + 1); if (!r) return -ENOMEM; for (x = p; x < p + (l / 8) * 8; x += 8) { /* a == 000XXXXX; b == 000YYYYY; c == 000ZZZZZ; d == 000WWWWW e == 000SSSSS; f == 000QQQQQ; g == 000VVVVV; h == 000RRRRR */ a = unbase32hexchar(x[0]); if (a < 0) return -EINVAL; b = unbase32hexchar(x[1]); if (b < 0) return -EINVAL; c = unbase32hexchar(x[2]); if (c < 0) return -EINVAL; d = unbase32hexchar(x[3]); if (d < 0) return -EINVAL; e = unbase32hexchar(x[4]); if (e < 0) return -EINVAL; f = unbase32hexchar(x[5]); if (f < 0) return -EINVAL; g = unbase32hexchar(x[6]); if (g < 0) return -EINVAL; h = unbase32hexchar(x[7]); if (h < 0) return -EINVAL; *(z++) = (uint8_t) a << 3 | (uint8_t) b >> 2; /* XXXXXYYY */ *(z++) = (uint8_t) b << 6 | (uint8_t) c << 1 | (uint8_t) d >> 4; /* YYZZZZZW */ *(z++) = (uint8_t) d << 4 | (uint8_t) e >> 1; /* WWWWSSSS */ *(z++) = (uint8_t) e << 7 | (uint8_t) f << 2 | (uint8_t) g >> 3; /* SQQQQQVV */ *(z++) = (uint8_t) g << 5 | (uint8_t) h; /* VVVRRRRR */ } switch (l % 8) { case 7: a = unbase32hexchar(x[0]); if (a < 0) return -EINVAL; b = unbase32hexchar(x[1]); if (b < 0) return -EINVAL; c = unbase32hexchar(x[2]); if (c < 0) return -EINVAL; d = unbase32hexchar(x[3]); if (d < 0) return -EINVAL; e = unbase32hexchar(x[4]); if (e < 0) return -EINVAL; f = unbase32hexchar(x[5]); if (f < 0) return -EINVAL; g = unbase32hexchar(x[6]); if (g < 0) return -EINVAL; /* g == 000VV000 */ if (g & 7) return -EINVAL; *(z++) = (uint8_t) a << 3 | (uint8_t) b >> 2; /* XXXXXYYY */ *(z++) = (uint8_t) b << 6 | (uint8_t) c << 1 | (uint8_t) d >> 4; /* YYZZZZZW */ *(z++) = (uint8_t) d << 4 | (uint8_t) e >> 1; /* WWWWSSSS */ *(z++) = (uint8_t) e << 7 | (uint8_t) f << 2 | (uint8_t) g >> 3; /* SQQQQQVV */ break; case 5: a = unbase32hexchar(x[0]); if (a < 0) return -EINVAL; b = unbase32hexchar(x[1]); if (b < 0) return -EINVAL; c = unbase32hexchar(x[2]); if (c < 0) return -EINVAL; d = unbase32hexchar(x[3]); if (d < 0) return -EINVAL; e = unbase32hexchar(x[4]); if (e < 0) return -EINVAL; /* e == 000SSSS0 */ if (e & 1) return -EINVAL; *(z++) = (uint8_t) a << 3 | (uint8_t) b >> 2; /* XXXXXYYY */ *(z++) = (uint8_t) b << 6 | (uint8_t) c << 1 | (uint8_t) d >> 4; /* YYZZZZZW */ *(z++) = (uint8_t) d << 4 | (uint8_t) e >> 1; /* WWWWSSSS */ break; case 4: a = unbase32hexchar(x[0]); if (a < 0) return -EINVAL; b = unbase32hexchar(x[1]); if (b < 0) return -EINVAL; c = unbase32hexchar(x[2]); if (c < 0) return -EINVAL; d = unbase32hexchar(x[3]); if (d < 0) return -EINVAL; /* d == 000W0000 */ if (d & 15) return -EINVAL; *(z++) = (uint8_t) a << 3 | (uint8_t) b >> 2; /* XXXXXYYY */ *(z++) = (uint8_t) b << 6 | (uint8_t) c << 1 | (uint8_t) d >> 4; /* YYZZZZZW */ break; case 2: a = unbase32hexchar(x[0]); if (a < 0) return -EINVAL; b = unbase32hexchar(x[1]); if (b < 0) return -EINVAL; /* b == 000YYY00 */ if (b & 3) return -EINVAL; *(z++) = (uint8_t) a << 3 | (uint8_t) b >> 2; /* XXXXXYYY */ break; case 0: break; default: return -EINVAL; } *z = 0; *mem = r; r = NULL; *_len = len; return 0; } /* https://tools.ietf.org/html/rfc4648#section-4 */ char base64char(int x) { static const char table[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" "abcdefghijklmnopqrstuvwxyz" "0123456789+/"; return table[x & 63]; } int unbase64char(char c) { unsigned offset; if (c >= 'A' && c <= 'Z') return c - 'A'; offset = 'Z' - 'A' + 1; if (c >= 'a' && c <= 'z') return c - 'a' + offset; offset += 'z' - 'a' + 1; if (c >= '0' && c <= '9') return c - '0' + offset; offset += '9' - '0' + 1; if (c == '+') return offset; offset++; if (c == '/') return offset; return -EINVAL; } ssize_t base64mem(const void *p, size_t l, char **out) { char *r, *z; const uint8_t *x; /* three input bytes makes four output bytes, padding is added so we must round up */ z = r = malloc(4 * (l + 2) / 3 + 1); if (!r) return -ENOMEM; for (x = p; x < (const uint8_t*) p + (l / 3) * 3; x += 3) { /* x[0] == XXXXXXXX; x[1] == YYYYYYYY; x[2] == ZZZZZZZZ */ *(z++) = base64char(x[0] >> 2); /* 00XXXXXX */ *(z++) = base64char((x[0] & 3) << 4 | x[1] >> 4); /* 00XXYYYY */ *(z++) = base64char((x[1] & 15) << 2 | x[2] >> 6); /* 00YYYYZZ */ *(z++) = base64char(x[2] & 63); /* 00ZZZZZZ */ } switch (l % 3) { case 2: *(z++) = base64char(x[0] >> 2); /* 00XXXXXX */ *(z++) = base64char((x[0] & 3) << 4 | x[1] >> 4); /* 00XXYYYY */ *(z++) = base64char((x[1] & 15) << 2); /* 00YYYY00 */ *(z++) = '='; break; case 1: *(z++) = base64char(x[0] >> 2); /* 00XXXXXX */ *(z++) = base64char((x[0] & 3) << 4); /* 00XX0000 */ *(z++) = '='; *(z++) = '='; break; } *z = 0; *out = r; return z - r; } static int base64_append_width(char **prefix, int plen, const char *sep, int indent, const void *p, size_t l, int width) { _cleanup_free_ char *x = NULL; char *t, *s; ssize_t slen, len, avail; int line, lines; len = base64mem(p, l, &x); if (len <= 0) return len; lines = (len + width - 1) / width; slen = sep ? strlen(sep) : 0; t = realloc(*prefix, plen + 1 + slen + (indent + width + 1) * lines); if (!t) return -ENOMEM; memcpy_safe(t + plen, sep, slen); for (line = 0, s = t + plen + slen, avail = len; line < lines; line++) { int act = MIN(width, avail); if (line > 0 || sep) { memset(s, ' ', indent); s += indent; } memcpy(s, x + width * line, act); s += act; *(s++) = line < lines - 1 ? '\n' : '\0'; avail -= act; } assert(avail == 0); *prefix = t; return 0; } int base64_append(char **prefix, int plen, const void *p, size_t l, int indent, int width) { if (plen > width / 2 || plen + indent > width) /* leave indent on the left, keep last column free */ return base64_append_width(prefix, plen, "\n", indent, p, l, width - indent - 1); else /* leave plen on the left, keep last column free */ return base64_append_width(prefix, plen, NULL, plen, p, l, width - plen - 1); }; int unbase64mem(const char *p, size_t l, void **mem, size_t *_len) { _cleanup_free_ uint8_t *r = NULL; int a, b, c, d; uint8_t *z; const char *x; size_t len; assert(p); /* padding ensures any base63 input has input divisible by 4 */ if (l % 4 != 0) return -EINVAL; /* strip the padding */ if (l > 0 && p[l - 1] == '=') l--; if (l > 0 && p[l - 1] == '=') l--; /* a group of four input bytes needs three output bytes, in case of padding we need to add two or three extra bytes */ len = (l / 4) * 3 + (l % 4 ? (l % 4) - 1 : 0); z = r = malloc(len + 1); if (!r) return -ENOMEM; for (x = p; x < p + (l / 4) * 4; x += 4) { /* a == 00XXXXXX; b == 00YYYYYY; c == 00ZZZZZZ; d == 00WWWWWW */ a = unbase64char(x[0]); if (a < 0) return -EINVAL; b = unbase64char(x[1]); if (b < 0) return -EINVAL; c = unbase64char(x[2]); if (c < 0) return -EINVAL; d = unbase64char(x[3]); if (d < 0) return -EINVAL; *(z++) = (uint8_t) a << 2 | (uint8_t) b >> 4; /* XXXXXXYY */ *(z++) = (uint8_t) b << 4 | (uint8_t) c >> 2; /* YYYYZZZZ */ *(z++) = (uint8_t) c << 6 | (uint8_t) d; /* ZZWWWWWW */ } switch (l % 4) { case 3: a = unbase64char(x[0]); if (a < 0) return -EINVAL; b = unbase64char(x[1]); if (b < 0) return -EINVAL; c = unbase64char(x[2]); if (c < 0) return -EINVAL; /* c == 00ZZZZ00 */ if (c & 3) return -EINVAL; *(z++) = (uint8_t) a << 2 | (uint8_t) b >> 4; /* XXXXXXYY */ *(z++) = (uint8_t) b << 4 | (uint8_t) c >> 2; /* YYYYZZZZ */ break; case 2: a = unbase64char(x[0]); if (a < 0) return -EINVAL; b = unbase64char(x[1]); if (b < 0) return -EINVAL; /* b == 00YY0000 */ if (b & 15) return -EINVAL; *(z++) = (uint8_t) a << 2 | (uint8_t) (b >> 4); /* XXXXXXYY */ break; case 0: break; default: return -EINVAL; } *z = 0; *mem = r; r = NULL; *_len = len; return 0; } void hexdump(FILE *f, const void *p, size_t s) { const uint8_t *b = p; unsigned n = 0; assert(s == 0 || b); while (s > 0) { size_t i; fprintf(f, "%04x ", n); for (i = 0; i < 16; i++) { if (i >= s) fputs(" ", f); else fprintf(f, "%02x ", b[i]); if (i == 7) fputc(' ', f); } fputc(' ', f); for (i = 0; i < 16; i++) { if (i >= s) fputc(' ', f); else fputc(isprint(b[i]) ? (char) b[i] : '.', f); } fputc('\n', f); if (s < 16) break; n += 16; b += 16; s -= 16; } }