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-rw-r--r--src/lib-http/http-date.c487
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diff --git a/src/lib-http/http-date.c b/src/lib-http/http-date.c
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+++ b/src/lib-http/http-date.c
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+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "str.h"
+#include "utc-mktime.h"
+#include "http-date.h"
+
+#include <ctype.h>
+
+/* RFC 7231, Section 7.1.1.1: Date/Time Formats
+
+ The defined syntax is as follows:
+
+ HTTP-date = IMF-fixdate / obs-date
+
+ Preferred format:
+
+ IMF-fixdate = day-name "," SP date1 SP time-of-day SP GMT
+ ; fixed length/zone/capitalization subset of the format
+ ; see Section 3.3 of [RFC5322]
+ day-name = %x4D.6F.6E ; "Mon", case-sensitive
+ / %x54.75.65 ; "Tue", case-sensitive
+ / %x57.65.64 ; "Wed", case-sensitive
+ / %x54.68.75 ; "Thu", case-sensitive
+ / %x46.72.69 ; "Fri", case-sensitive
+ / %x53.61.74 ; "Sat", case-sensitive
+ / %x53.75.6E ; "Sun", case-sensitive
+ date1 = day SP month SP year
+ ; e.g., 02 Jun 1982
+ day = 2DIGIT
+ month = %x4A.61.6E ; "Jan", case-sensitive
+ / %x46.65.62 ; "Feb", case-sensitive
+ / %x4D.61.72 ; "Mar", case-sensitive
+ / %x41.70.72 ; "Apr", case-sensitive
+ / %x4D.61.79 ; "May", case-sensitive
+ / %x4A.75.6E ; "Jun", case-sensitive
+ / %x4A.75.6C ; "Jul", case-sensitive
+ / %x41.75.67 ; "Aug", case-sensitive
+ / %x53.65.70 ; "Sep", case-sensitive
+ / %x4F.63.74 ; "Oct", case-sensitive
+ / %x4E.6F.76 ; "Nov", case-sensitive
+ / %x44.65.63 ; "Dec", case-sensitive
+ year = 4DIGIT
+ GMT = %x47.4D.54 ; "GMT", case-sensitive
+ time-of-day = hour ":" minute ":" second
+ ; 00:00:00 - 23:59:60 (leap second)
+ hour = 2DIGIT
+ minute = 2DIGIT
+ second = 2DIGIT
+
+ Obsolete formats:
+
+ obs-date = rfc850-date / asctime-date
+
+ rfc850-date = day-name-l "," SP date2 SP time-of-day SP GMT
+ date2 = day "-" month "-" 2DIGIT
+ ; e.g., 02-Jun-82
+ day-name-l = %x4D.6F.6E.64.61.79 ; "Monday", case-sensitive
+ / %x54.75.65.73.64.61.79 ; "Tuesday", case-sensitive
+ / %x57.65.64.6E.65.73.64.61.79 ; "Wednesday", case-sensitive
+ / %x54.68.75.72.73.64.61.79 ; "Thursday", case-sensitive
+ / %x46.72.69.64.61.79 ; "Friday", case-sensitive
+ / %x53.61.74.75.72.64.61.79 ; "Saturday", case-sensitive
+ / %x53.75.6E.64.61.79 ; "Sunday", case-sensitive
+
+ asctime-date = day-name SP date3 SP time-of-day SP year
+ date3 = month SP ( 2DIGIT / ( SP 1DIGIT ))
+ ; e.g., Jun 2
+ */
+
+static const char *month_names[] = {
+ "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+ "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+};
+
+static const char *weekday_names[] = {
+ "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
+};
+
+static const char *weekday_names_long[] = {
+ "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
+};
+
+struct http_date_parser {
+ const unsigned char *cur, *end;
+
+ struct tm tm;
+ int timezone_offset;
+};
+
+static inline int
+http_date_parse_sp(struct http_date_parser *parser)
+{
+ if (parser->cur >= parser->end)
+ return -1;
+ if (parser->cur[0] != ' ')
+ return 0;
+ parser->cur++;
+ return 1;
+}
+
+static inline int
+http_date_parse_number(struct http_date_parser *parser,
+ int digits, int *number_r)
+{
+ int i;
+
+ if (parser->cur >= parser->end || !i_isdigit(parser->cur[0]))
+ return 0;
+
+ *number_r = parser->cur[0] - '0';
+ parser->cur++;
+
+ for (i=0; i < digits-1; i++) {
+ if (parser->cur >= parser->end || !i_isdigit(parser->cur[0]))
+ return -1;
+ *number_r = ((*number_r) * 10) + parser->cur[0] - '0';
+ parser->cur++;
+ }
+ return 1;
+}
+
+static inline int
+http_date_parse_word(struct http_date_parser *parser,
+ int maxchars, string_t **word_r)
+{
+ string_t *word;
+ int i;
+
+ if (parser->cur >= parser->end || !i_isalpha(parser->cur[0]))
+ return 0;
+
+ word = t_str_new(maxchars);
+ str_append_c(word, parser->cur[0]);
+ parser->cur++;
+
+ for (i=0; i < maxchars-1; i++) {
+ if (parser->cur >= parser->end || !i_isalpha(parser->cur[0]))
+ break;
+ str_append_c(word, parser->cur[0]);
+ parser->cur++;
+ }
+
+ if (parser->cur < parser->end && i_isalpha(parser->cur[0]))
+ return -1;
+ *word_r = word;
+ return 1;
+}
+
+static inline int
+http_date_parse_year(struct http_date_parser *parser)
+{
+ /* year = 4DIGIT */
+ if (http_date_parse_number(parser, 4, &parser->tm.tm_year) <= 0)
+ return -1;
+ if (parser->tm.tm_year < 1900)
+ return -1;
+ parser->tm.tm_year -= 1900;
+ return 1;
+}
+
+static inline int
+http_date_parse_month(struct http_date_parser *parser)
+{
+ string_t *month;
+ int i;
+
+ if (http_date_parse_word(parser, 3, &month) <= 0 || str_len(month) != 3)
+ return -1;
+
+ for (i = 0; i < 12; i++) {
+ if (strcmp(month_names[i], str_c(month)) == 0) {
+ break;
+ }
+ }
+ if (i >= 12)
+ return -1;
+
+ parser->tm.tm_mon = i;
+ return 1;
+}
+
+static inline int
+http_date_parse_day(struct http_date_parser *parser)
+{
+ /* day = 2DIGIT */
+ if (http_date_parse_number(parser, 2, &parser->tm.tm_mday) <= 0)
+ return -1;
+ return 1;
+}
+
+static int
+http_date_parse_time_of_day(struct http_date_parser *parser)
+{
+ /* time-of-day = hour ":" minute ":" second
+ ; 00:00:00 - 23:59:59
+ hour = 2DIGIT
+ minute = 2DIGIT
+ second = 2DIGIT
+ */
+
+ /* hour = 2DIGIT */
+ if (http_date_parse_number(parser, 2, &parser->tm.tm_hour) <= 0)
+ return -1;
+
+ /* ":" */
+ if (parser->cur >= parser->end || parser->cur[0] != ':')
+ return -1;
+ parser->cur++;
+
+ /* minute = 2DIGIT */
+ if (http_date_parse_number(parser, 2, &parser->tm.tm_min) <= 0)
+ return -1;
+
+ /* ":" */
+ if (parser->cur >= parser->end || parser->cur[0] != ':')
+ return -1;
+ parser->cur++;
+
+ /* second = 2DIGIT */
+ if (http_date_parse_number(parser, 2, &parser->tm.tm_sec) <= 0)
+ return -1;
+ return 1;
+}
+
+static inline int
+http_date_parse_time_gmt(struct http_date_parser *parser)
+{
+ string_t *gmt;
+
+ /* Remaining: {...} SP time-of-day SP GMT
+ */
+
+ /* SP time-of-day */
+ if (http_date_parse_sp(parser) <= 0)
+ return -1;
+ if (http_date_parse_time_of_day(parser) <= 0)
+ return -1;
+
+ /* SP GMT */
+ if (http_date_parse_sp(parser) <= 0)
+ return -1;
+ if (http_date_parse_word(parser, 3, &gmt) <= 0 ||
+ strcmp("GMT", str_c(gmt)) != 0)
+ return -1;
+ return 1;
+}
+
+static int
+http_date_parse_format_imf_fixdate(struct http_date_parser *parser)
+{
+ /*
+ IMF-fixdate = day-name "," SP date1 SP time-of-day SP GMT
+ ; fixed length/zone/capitalization subset of the format
+ ; see Section 3.3 of [RFC5322]
+ date1 = day SP month SP year
+ ; e.g., 02 Jun 1982
+
+ Remaining: {...} SP day SP month SP year SP time-of-day SP GMT
+
+ */
+
+ /* SP day */
+ if (http_date_parse_sp(parser) <= 0)
+ return -1;
+ if (http_date_parse_day(parser) <= 0)
+ return -1;
+
+ /* SP month */
+ if (http_date_parse_sp(parser) <= 0)
+ return -1;
+ if (http_date_parse_month(parser) <= 0)
+ return -1;
+
+ /* SP year */
+ if (http_date_parse_sp(parser) <= 0)
+ return -1;
+ if (http_date_parse_year(parser) <= 0)
+ return -1;
+
+ /* SP time-of-day SP GMT */
+ return http_date_parse_time_gmt(parser);
+}
+
+static int
+http_date_parse_format_rfc850(struct http_date_parser *parser)
+{
+ /*
+ rfc850-date = day-name-l "," SP date2 SP time-of-day SP GMT
+ date2 = day "-" month "-" 2DIGIT
+ ; day-month-year (e.g., 02-Jun-82)
+
+ Remaining: "," SP day "-" month "-" 2DIGIT SP time-of-day SP GMT
+ */
+
+ /* "," SP */
+ if (parser->cur >= parser->end || parser->cur[0] != ',')
+ return -1;
+ parser->cur++;
+ if (http_date_parse_sp(parser) <= 0)
+ return -1;
+
+ /* day */
+ if (http_date_parse_day(parser) <= 0)
+ return -1;
+
+ /* "-" */
+ if (parser->cur >= parser->end || parser->cur[0] != '-')
+ return -1;
+ parser->cur++;
+
+ /* month */
+ if (http_date_parse_month(parser) <= 0)
+ return -1;
+
+ /* "-" */
+ if (parser->cur >= parser->end || parser->cur[0] != '-')
+ return -1;
+ parser->cur++;
+
+ /* 2DIGIT */
+ if (http_date_parse_number(parser, 2, &parser->tm.tm_year) <= 0)
+ return -1;
+ if (parser->tm.tm_year < 70)
+ parser->tm.tm_year += 100;
+
+ /* SP time-of-day SP GMT */
+ return http_date_parse_time_gmt(parser);
+}
+
+static int
+http_date_parse_format_asctime(struct http_date_parser *parser)
+{
+ int ret;
+
+ /*
+ asctime-date = day-name SP date3 SP time-of-day SP year
+ date3 = month SP ( 2DIGIT / ( SP 1DIGIT ))
+ ; month day (e.g., Jun 2)
+
+ Remaining: {...} month SP ( 2DIGIT / ( SP 1DIGIT )) SP time-of-day SP year
+ */
+
+ /* month */
+ if (http_date_parse_month(parser) <= 0)
+ return -1;
+
+ /* SP */
+ if (http_date_parse_sp(parser) <= 0)
+ return -1;
+
+ /* SP 1DIGIT / 2DIGIT */
+ if ((ret=http_date_parse_sp(parser)) < 0)
+ return -1;
+ if (ret == 0) {
+ if (http_date_parse_number(parser, 2, &parser->tm.tm_mday) <= 0)
+ return -1;
+ } else {
+ if (http_date_parse_number(parser, 1, &parser->tm.tm_mday) <= 0)
+ return -1;
+ }
+
+ /* SP time-of-day */
+ if (http_date_parse_sp(parser) <= 0)
+ return -1;
+ if (http_date_parse_time_of_day(parser) <= 0)
+ return -1;
+
+ /* SP year */
+ if (http_date_parse_sp(parser) <= 0)
+ return -1;
+
+ return http_date_parse_year(parser);
+}
+
+static int
+http_date_parse_format_any(struct http_date_parser *parser)
+{
+ string_t *dayname;
+ int i;
+
+ /*
+ HTTP-date = IMF-fixdate / obs-date
+ IMF-fixdate = day-name "," SP date1 SP time-of-day SP GMT
+ ; fixed length/zone/capitalization subset of the format
+ ; see Section 3.3 of [RFC5322]
+ obs-date = rfc850-date / asctime-date
+ rfc850-date = day-name-l "," SP date2 SP time-of-day SP GMT
+ asctime-date = day-name SP date3 SP time-of-day SP year
+ */
+
+ if (http_date_parse_word(parser, 9, &dayname) <= 0)
+ return -1;
+
+ if (str_len(dayname) > 3) {
+ /* rfc850-date */
+ for (i = 0; i < 7; i++) {
+ if (strcmp(weekday_names_long[i], str_c(dayname)) == 0) {
+ break;
+ }
+ }
+ if (i >= 7)
+ return -1;
+ return http_date_parse_format_rfc850(parser);
+ }
+
+ /* IMF-fixdate / asctime-date */
+ for (i = 0; i < 7; i++) {
+ if (strcmp(weekday_names[i], str_c(dayname)) == 0) {
+ break;
+ }
+ }
+
+ if (i >= 7 || parser->cur >= parser->end)
+ return -1;
+
+ if (parser->cur[0] == ' ') {
+ /* asctime-date */
+ parser->cur++;
+ return http_date_parse_format_asctime(parser);
+ }
+
+ if (parser->cur[0] != ',')
+ return -1;
+
+ /* IMF-fixdate */
+ parser->cur++;
+ return http_date_parse_format_imf_fixdate(parser);
+}
+
+bool http_date_parse(const unsigned char *data, size_t size,
+ time_t *timestamp_r)
+{
+ struct http_date_parser parser;
+ time_t timestamp;
+
+ i_zero(&parser);
+ parser.cur = data;
+ parser.end = data + size;
+
+ if (http_date_parse_format_any(&parser) <= 0)
+ return FALSE;
+
+ if (parser.cur != parser.end)
+ return FALSE;
+
+ parser.tm.tm_isdst = -1;
+ timestamp = utc_mktime(&parser.tm);
+ if (timestamp == (time_t)-1)
+ return FALSE;
+
+ *timestamp_r = timestamp;
+ return TRUE;
+}
+
+bool http_date_parse_tm(const unsigned char *data, size_t size,
+ struct tm *tm_r)
+{
+ time_t timestamp;
+ struct tm *tm;
+
+ if (!http_date_parse(data, size, &timestamp))
+ return FALSE;
+
+ tm = gmtime(&timestamp);
+ *tm_r = *tm;
+ return TRUE;
+}
+
+const char *http_date_create_tm(struct tm *tm)
+{
+ return t_strdup_printf("%s, %02d %s %04d %02d:%02d:%02d GMT",
+ weekday_names[tm->tm_wday],
+ tm->tm_mday,
+ month_names[tm->tm_mon],
+ tm->tm_year+1900,
+ tm->tm_hour, tm->tm_min, tm->tm_sec);
+}
+
+const char *http_date_create(time_t timestamp)
+{
+ struct tm *tm;
+ tm = gmtime(&timestamp);
+
+ return http_date_create_tm(tm);
+}
+
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