From 3d0f1cb9fdd630c6c920bc97bf496538717e7705 Mon Sep 17 00:00:00 2001 From: Paul Yang Date: Tue, 11 Jul 2017 03:01:24 +0800 Subject: [PATCH] Add asn1_time_to_tm function and check days in month Based on discussion in PR #3566. Reduce duplicated code in original asn1_utctime_to_tm and asn1_generalizedtime_to_tm, and introduce a new internal function asn1_time_to_tm. This function also checks if the days in the input time string is valid or not for the corresponding month. Test cases are also added. Reviewed-by: Andy Polyakov Reviewed-by: Paul Dale (Merged from https://github.com/openssl/openssl/pull/3905) --- crypto/asn1/a_gentm.c | 152 +-------------------------- crypto/asn1/a_time.c | 206 +++++++++++++++++++++++++++++++++++-- crypto/asn1/a_utctm.c | 113 +------------------- crypto/asn1/asn1_locl.h | 1 + doc/man3/ASN1_TIME_set.pod | 6 +- test/x509_time_test.c | 16 +++ 6 files changed, 222 insertions(+), 272 deletions(-) diff --git a/crypto/asn1/a_gentm.c b/crypto/asn1/a_gentm.c index 5cfc3ff15e..8b2b66b964 100644 --- a/crypto/asn1/a_gentm.c +++ b/crypto/asn1/a_gentm.c @@ -19,155 +19,11 @@ int asn1_generalizedtime_to_tm(struct tm *tm, const ASN1_GENERALIZEDTIME *d) { - static const int min[9] = { 0, 0, 1, 1, 0, 0, 0, 0, 0 }; - static const int max[9] = { 99, 99, 12, 31, 23, 59, 59, 12, 59 }; - char *a; - int n, i, l, o, min_l = 13, strict = 0; - + /* wrapper around asn1_time_to_tm */ if (d->type != V_ASN1_GENERALIZEDTIME) - return (0); - l = d->length; - a = (char *)d->data; - o = 0; - /* - * GENERALIZEDTIME is similar to UTCTIME except the year is represented - * as YYYY. This stuff treats everything as a two digit field so make - * first two fields 00 to 99 - */ - - /* - * ASN1_STRING_FLAG_X509_TIME is used to enforce RFC 5280 - * time string format, in which: - * - * 1. "seconds" is a 'MUST' - * 2. "Zulu" timezone is a 'MUST' - * 3. "+|-" is not allowed to indicate a time zone - * 4. fractional seconds are not allowed in GeneralizedTime - */ - - if (d->flags & ASN1_STRING_FLAG_X509_TIME) { - min_l = 15; - strict = 1; - } - - if (l < min_l) - goto err; - for (i = 0; i < 7; i++) { - if (!strict && (i == 6) && ((a[o] == 'Z') || (a[o] == '+') || (a[o] == '-'))) { - i++; - if (tm) - tm->tm_sec = 0; - break; - } - if ((a[o] < '0') || (a[o] > '9')) - goto err; - n = a[o] - '0'; - /* incomplete 2-digital number */ - if (++o == l) - goto err; - - if ((a[o] < '0') || (a[o] > '9')) - goto err; - n = (n * 10) + a[o] - '0'; - /* no more bytes to read, but we haven't seen time-zone yet */ - if (++o == l) - goto err; - - if ((n < min[i]) || (n > max[i])) - goto err; - if (tm) { - switch (i) { - case 0: - tm->tm_year = n * 100 - 1900; - break; - case 1: - tm->tm_year += n; - break; - case 2: - tm->tm_mon = n - 1; - break; - case 3: - tm->tm_mday = n; - break; - case 4: - tm->tm_hour = n; - break; - case 5: - tm->tm_min = n; - break; - case 6: - tm->tm_sec = n; - break; - } - } - } - /* - * Optional fractional seconds: decimal point followed by one or more - * digits. - */ - if (a[o] == '.') { - if (strict) - /* RFC 5280 forbids fractional seconds */ - goto err; - if (++o == l) - goto err; - i = o; - while ((o < l) && (a[o] >= '0') && (a[o] <= '9')) - o++; - /* Must have at least one digit after decimal point */ - if (i == o) - goto err; - /* no more bytes to read, but we haven't seen time-zone yet */ - if (o == l) - goto err; - } - - /* - * 'o' will never point to '\0' at this point, the only chance - * 'o' can point th '\0' is either the subsequent if or the first - * else if is true. - */ - if (a[o] == 'Z') { - o++; - } else if (!strict && ((a[o] == '+') || (a[o] == '-'))) { - int offsign = a[o] == '-' ? 1 : -1, offset = 0; - o++; - /* - * if not equal, no need to do subsequent checks - * since the following for-loop will add 'o' by 4 - * and the final return statement will check if 'l' - * and 'o' are equal. - */ - if (o + 4 != l) - goto err; - for (i = 7; i < 9; i++) { - if ((a[o] < '0') || (a[o] > '9')) - goto err; - n = a[o] - '0'; - o++; - if ((a[o] < '0') || (a[o] > '9')) - goto err; - n = (n * 10) + a[o] - '0'; - if ((n < min[i]) || (n > max[i])) - goto err; - if (tm) { - if (i == 7) - offset = n * 3600; - else if (i == 8) - offset += n * 60; - } - o++; - } - if (offset && !OPENSSL_gmtime_adj(tm, 0, offset * offsign)) - return 0; - } else if (a[o]) { - /* Missing time zone information. */ - goto err; - } - return (o == l); - err: - return (0); -} + return 0; + return asn1_time_to_tm(tm, d); + } int ASN1_GENERALIZEDTIME_check(const ASN1_GENERALIZEDTIME *d) { diff --git a/crypto/asn1/a_time.c b/crypto/asn1/a_time.c index fc78e309a6..6e3fade2ee 100644 --- a/crypto/asn1/a_time.c +++ b/crypto/asn1/a_time.c @@ -24,6 +24,199 @@ IMPLEMENT_ASN1_MSTRING(ASN1_TIME, B_ASN1_TIME) IMPLEMENT_ASN1_FUNCTIONS(ASN1_TIME) +static int leap_year(const int year) +{ + if (year % 400 == 0 || (year % 100 != 0 && year % 4 == 0)) + return 1; + return 0; +} + +int asn1_time_to_tm(struct tm *tm, const ASN1_TIME *d) +{ + static const int min[9] = { 0, 0, 1, 1, 0, 0, 0, 0, 0 }; + static const int max[9] = { 99, 99, 12, 31, 23, 59, 59, 12, 59 }; + static const int mdays[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; + char *a; + int n, i, i2, l, o, min_l = 11, strict = 0, end = 6, btz = 5, md; + struct tm tmp; + + /* + * ASN1_STRING_FLAG_X509_TIME is used to enforce RFC 5280 + * time string format, in which: + * + * 1. "seconds" is a 'MUST' + * 2. "Zulu" timezone is a 'MUST' + * 3. "+|-" is not allowed to indicate a time zone + */ + if (d->type == V_ASN1_UTCTIME) { + if (d->flags & ASN1_STRING_FLAG_X509_TIME) { + min_l = 13; + strict = 1; + } + } else if (d->type == V_ASN1_GENERALIZEDTIME) { + end = 7; + btz = 6; + if (d->flags & ASN1_STRING_FLAG_X509_TIME) { + min_l = 15; + strict = 1; + } else { + min_l = 13; + } + } else { + return 0; + } + + l = d->length; + a = (char *)d->data; + o = 0; + memset(&tmp, 0, sizeof(tmp)); + + /* + * GENERALIZEDTIME is similar to UTCTIME except the year is represented + * as YYYY. This stuff treats everything as a two digit field so make + * first two fields 00 to 99 + */ + + if (l < min_l) + goto err; + for (i = 0; i < end; i++) { + if (!strict && (i == btz) && ((a[o] == 'Z') || (a[o] == '+') || (a[o] == '-'))) { + i++; + break; + } + if ((a[o] < '0') || (a[o] > '9')) + goto err; + n = a[o] - '0'; + /* incomplete 2-digital number */ + if (++o == l) + goto err; + + if ((a[o] < '0') || (a[o] > '9')) + goto err; + n = (n * 10) + a[o] - '0'; + /* no more bytes to read, but we haven't seen time-zone yet */ + if (++o == l) + goto err; + + i2 = (d->type == V_ASN1_UTCTIME) ? i + 1 : i; + + if ((n < min[i2]) || (n > max[i2])) + goto err; + switch (i2) { + case 0: + /* UTC will never be here */ + tmp.tm_year = n * 100 - 1900; + break; + case 1: + if (d->type == V_ASN1_UTCTIME) + tmp.tm_year = n < 50 ? n + 100 : n; + else + tmp.tm_year += n; + break; + case 2: + tmp.tm_mon = n - 1; + break; + case 3: + /* check if tm_mday is valid in tm_mon */ + if (tmp.tm_mon == 1) { + /* it's February */ + md = mdays[1] + leap_year(tmp.tm_year + 1900); + } else { + md = mdays[tmp.tm_mon]; + } + if (n > md) + goto err; + tmp.tm_mday = n; + break; + case 4: + tmp.tm_hour = n; + break; + case 5: + tmp.tm_min = n; + break; + case 6: + tmp.tm_sec = n; + break; + } + } + + /* + * Optional fractional seconds: decimal point followed by one or more + * digits. + */ + if (d->type == V_ASN1_GENERALIZEDTIME && a[o] == '.') { + if (strict) + /* RFC 5280 forbids fractional seconds */ + goto err; + if (++o == l) + goto err; + i = o; + while ((o < l) && (a[o] >= '0') && (a[o] <= '9')) + o++; + /* Must have at least one digit after decimal point */ + if (i == o) + goto err; + /* no more bytes to read, but we haven't seen time-zone yet */ + if (o == l) + goto err; + } + + /* + * 'o' will never point to '\0' at this point, the only chance + * 'o' can point to '\0' is either the subsequent if or the first + * else if is true. + */ + if (a[o] == 'Z') { + o++; + } else if (!strict && ((a[o] == '+') || (a[o] == '-'))) { + int offsign = a[o] == '-' ? 1 : -1; + int offset = 0; + + o++; + /* + * if not equal, no need to do subsequent checks + * since the following for-loop will add 'o' by 4 + * and the final return statement will check if 'l' + * and 'o' are equal. + */ + if (o + 4 != l) + goto err; + for (i = end; i < end + 2; i++) { + if ((a[o] < '0') || (a[o] > '9')) + goto err; + n = a[o] - '0'; + o++; + if ((a[o] < '0') || (a[o] > '9')) + goto err; + n = (n * 10) + a[o] - '0'; + i2 = (d->type == V_ASN1_UTCTIME) ? i + 1 : i; + if ((n < min[i2]) || (n > max[i2])) + goto err; + /* if tm is NULL, no need to adjust */ + if (tm != NULL) { + if (i == end) + offset = n * 3600; + else if (i == end + 1) + offset += n * 60; + } + o++; + } + if (offset && !OPENSSL_gmtime_adj(&tmp, 0, offset * offsign)) + goto err; + } else { + /* not Z, or not +/- in non-strict mode */ + goto err; + } + if (o == l) { + /* success, check if tm should be filled */ + if (tm != NULL) + *tm = tmp; + return 1; + } + err: + return 0; +} + ASN1_TIME *ASN1_TIME_set(ASN1_TIME *s, time_t t) { return ASN1_TIME_adj(s, t, 0, 0); @@ -162,7 +355,7 @@ int ASN1_TIME_set_string_X509(ASN1_TIME *s, const char *str) */ if (s != NULL && t.type == V_ASN1_GENERALIZEDTIME) { - if (!asn1_generalizedtime_to_tm(&tm, &t)) + if (!asn1_time_to_tm(&tm, &t)) goto out; if (tm.tm_year >= 50 && tm.tm_year < 150) { t.length -= 2; @@ -200,16 +393,7 @@ int ASN1_TIME_to_tm(const ASN1_TIME *s, struct tm *tm) return 0; } - if (s->type == V_ASN1_UTCTIME) { - memset(tm, 0, sizeof(*tm)); - return asn1_utctime_to_tm(tm, s); - } - if (s->type == V_ASN1_GENERALIZEDTIME) { - memset(tm, 0, sizeof(*tm)); - return asn1_generalizedtime_to_tm(tm, s); - } - - return 0; + return asn1_time_to_tm(tm, s); } int ASN1_TIME_diff(int *pday, int *psec, diff --git a/crypto/asn1/a_utctm.c b/crypto/asn1/a_utctm.c index 5a4b1742f7..2a864180e3 100644 --- a/crypto/asn1/a_utctm.c +++ b/crypto/asn1/a_utctm.c @@ -15,119 +15,10 @@ int asn1_utctime_to_tm(struct tm *tm, const ASN1_UTCTIME *d) { - static const int min[8] = { 0, 1, 1, 0, 0, 0, 0, 0 }; - static const int max[8] = { 99, 12, 31, 23, 59, 59, 12, 59 }; - char *a; - int n, i, l, o, min_l = 11, strict = 0; - + /* wrapper around ans1_time_to_tm */ if (d->type != V_ASN1_UTCTIME) return 0; - l = d->length; - a = (char *)d->data; - o = 0; - - /* - * ASN1_STRING_FLAG_X509_TIME is used to enforce RFC 5280 - * time string format, in which: - * - * 1. "seconds" is a 'MUST' - * 2. "Zulu" timezone is a 'MUST' - * 3. "+|-" is not allowed to indicate a time zone - */ - - if (d->flags & ASN1_STRING_FLAG_X509_TIME) { - min_l = 13; - strict = 1; - } - - if (l < min_l) - goto err; - for (i = 0; i < 6; i++) { - if (!strict && (i == 5) && ((a[o] == 'Z') || (a[o] == '+') || (a[o] == '-'))) { - i++; - if (tm) - tm->tm_sec = 0; - break; - } - if ((a[o] < '0') || (a[o] > '9')) - goto err; - n = a[o] - '0'; - /* incomplete 2-digital number */ - if (++o == l) - goto err; - - if ((a[o] < '0') || (a[o] > '9')) - goto err; - n = (n * 10) + a[o] - '0'; - /* no more bytes to read, but we haven't seen time-zone yet */ - if (++o == l) - goto err; - - if ((n < min[i]) || (n > max[i])) - goto err; - if (tm) { - switch (i) { - case 0: - tm->tm_year = n < 50 ? n + 100 : n; - break; - case 1: - tm->tm_mon = n - 1; - break; - case 2: - tm->tm_mday = n; - break; - case 3: - tm->tm_hour = n; - break; - case 4: - tm->tm_min = n; - break; - case 5: - tm->tm_sec = n; - break; - } - } - } - - /* - * 'o' will never point to '\0' at this point, the only chance - * 'o' can point th '\0' is either the subsequent if or the first - * else if is true. - */ - if (a[o] == 'Z') { - o++; - } else if (!strict && ((a[o] == '+') || (a[o] == '-'))) { - int offsign = a[o] == '-' ? 1 : -1, offset = 0; - o++; - if (o + 4 != l) - goto err; - for (i = 6; i < 8; i++) { - if ((a[o] < '0') || (a[o] > '9')) - goto err; - n = a[o] - '0'; - o++; - if ((a[o] < '0') || (a[o] > '9')) - goto err; - n = (n * 10) + a[o] - '0'; - if ((n < min[i]) || (n > max[i])) - goto err; - if (tm) { - if (i == 6) - offset = n * 3600; - else if (i == 7) - offset += n * 60; - } - o++; - } - if (offset && !OPENSSL_gmtime_adj(tm, 0, offset * offsign)) - return 0; - } else { - /* not Z, or not +/- in non-strict mode */ - return 0; - } - return o == l; - err: - return 0; + return asn1_time_to_tm(tm, d); } int ASN1_UTCTIME_check(const ASN1_UTCTIME *d) diff --git a/crypto/asn1/asn1_locl.h b/crypto/asn1/asn1_locl.h index 9470c7d0bf..bf095eaa9f 100644 --- a/crypto/asn1/asn1_locl.h +++ b/crypto/asn1/asn1_locl.h @@ -9,6 +9,7 @@ /* Internal ASN1 structures and functions: not for application use */ +int asn1_time_to_tm(struct tm *tm, const ASN1_TIME *d); int asn1_utctime_to_tm(struct tm *tm, const ASN1_UTCTIME *d); int asn1_generalizedtime_to_tm(struct tm *tm, const ASN1_GENERALIZEDTIME *d); diff --git a/doc/man3/ASN1_TIME_set.pod b/doc/man3/ASN1_TIME_set.pod index 5f041a575c..379f28a4af 100644 --- a/doc/man3/ASN1_TIME_set.pod +++ b/doc/man3/ASN1_TIME_set.pod @@ -55,8 +55,10 @@ an error. ASN1_TIME_to_tm() converts the time B to the standard B structure. If B is NULL, then the current time is converted. The output time is GMT. -Only the B, B, B, B, B and B -fields are updated. +The B, B, B, B, B and B +fields of B structure are set to proper values, whereas all other fields +are set to 0. If B is NULL this function performs a format check on B +only. ASN1_TIME_diff() sets B<*pday> and B<*psec> to the time difference between B and B. If B represents a time later than B then diff --git a/test/x509_time_test.c b/test/x509_time_test.c index 6812805847..21f6980a49 100644 --- a/test/x509_time_test.c +++ b/test/x509_time_test.c @@ -55,6 +55,14 @@ static TESTDATA_FORMAT x509_format_tests[] = { /* good format, check only */ "20170217180105Z", 0, 1, -1, NULL, }, + { + /* not leap year, check only */ + "20170229180105Z", 0, 0, -1, NULL, + }, + { + /* leap year, check only */ + "20160229180105Z", 0, 1, -1, NULL, + }, { /* SS is missing, check only */ "201702171801Z", 0, 0, -1, NULL, @@ -96,6 +104,14 @@ static TESTDATA_FORMAT x509_format_tests[] = { /* SS is missing, check only */ "1702171801Z", 0, 0, -1, NULL, }, + { + /* not leap year, check only */ + "050229180101Z", 0, 0, -1, NULL, + }, + { + /* leap year, check only */ + "040229180101Z", 0, 1, -1, NULL, + }, { /* time zone, check only */ "170217180154+0800", 0, 0, -1, NULL, -- 2.25.1