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104 lines
2.7 KiB
104 lines
2.7 KiB
7 years ago
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diff -up openssl-1.0.1e/crypto/x509/x509_vfy.c.oob-read openssl-1.0.1e/crypto/x509/x509_vfy.c
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--- openssl-1.0.1e/crypto/x509/x509_vfy.c.oob-read 2015-05-25 12:03:41.000000000 +0200
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+++ openssl-1.0.1e/crypto/x509/x509_vfy.c 2015-06-09 15:01:51.688640453 +0200
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@@ -1702,49 +1702,92 @@ int X509_cmp_time(const ASN1_TIME *ctm,
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ASN1_TIME atm;
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long offset;
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char buff1[24],buff2[24],*p;
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- int i,j;
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+ int i, j, remaining;
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p=buff1;
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- i=ctm->length;
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+ remaining=ctm->length;
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str=(char *)ctm->data;
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+ /*
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+ * Note that the following (historical) code allows much more slack in the
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+ * time format than RFC5280. In RFC5280, the representation is fixed:
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+ * UTCTime: YYMMDDHHMMSSZ
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+ * GeneralizedTime: YYYYMMDDHHMMSSZ
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+ */
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if (ctm->type == V_ASN1_UTCTIME)
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{
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- if ((i < 11) || (i > 17)) return 0;
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+ /* YYMMDDHHMM[SS]Z or YYMMDDHHMM[SS](+-)hhmm */
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+ int min_length = sizeof("YYMMDDHHMMZ") - 1;
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+ int max_length = sizeof("YYMMDDHHMMSS+hhmm") - 1;
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+ if (remaining < min_length || remaining > max_length)
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+ return 0;
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memcpy(p,str,10);
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p+=10;
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str+=10;
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+ remaining -= 10;
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}
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else
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{
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- if (i < 13) return 0;
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+ /* YYYYMMDDHHMM[SS[.fff]]Z or YYYYMMDDHHMM[SS[.f[f[f]]]](+-)hhmm */
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+ int min_length = sizeof("YYYYMMDDHHMMZ") - 1;
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+ int max_length = sizeof("YYYYMMDDHHMMSS.fff+hhmm") - 1;
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+ if (remaining < min_length || remaining > max_length)
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+ return 0;
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memcpy(p,str,12);
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p+=12;
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str+=12;
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+ remaining -= 12;
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}
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if ((*str == 'Z') || (*str == '-') || (*str == '+'))
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{ *(p++)='0'; *(p++)='0'; }
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else
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{
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+ /* SS (seconds) */
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+ if (remaining < 2)
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+ return 0;
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*(p++)= *(str++);
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*(p++)= *(str++);
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- /* Skip any fractional seconds... */
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- if (*str == '.')
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+ remaining -= 2;
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+ /*
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+ * Skip any (up to three) fractional seconds...
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+ * TODO(emilia): in RFC5280, fractional seconds are forbidden.
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+ * Can we just kill them altogether?
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+ */
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+ if (remaining && *str == '.')
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{
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str++;
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- while ((*str >= '0') && (*str <= '9')) str++;
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+ remaining--;
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+ for (i = 0; i < 3 && remaining; i++, str++, remaining--)
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+ {
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+ if (*str < '0' || *str > '9')
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+ break;
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+ }
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}
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}
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*(p++)='Z';
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*(p++)='\0';
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+ /* We now need either a terminating 'Z' or an offset. */
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+ if (!remaining)
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+ return 0;
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if (*str == 'Z')
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+ {
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+ if (remaining != 1)
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+ return 0;
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offset=0;
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+ }
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else
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{
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+ /* (+-)HHMM */
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if ((*str != '+') && (*str != '-'))
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return 0;
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+ /* Historical behaviour: the (+-)hhmm offset is forbidden in RFC5280. */
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+ if (remaining != 5)
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+ return 0;
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+ if (str[1] < '0' || str[1] > '9' || str[2] < '0' || str[2] > '9' ||
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+ str[3] < '0' || str[3] > '9' || str[4] < '0' || str[4] > '9')
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+ return 0;
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offset=((str[1]-'0')*10+(str[2]-'0'))*60;
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offset+=(str[3]-'0')*10+(str[4]-'0');
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if (*str == '-')
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