diff options
Diffstat (limited to 'pigeonhole/src/lib-managesieve')
| -rw-r--r-- | pigeonhole/src/lib-managesieve/Makefile.am | 15 | ||||
| -rw-r--r-- | pigeonhole/src/lib-managesieve/Makefile.in | 691 | ||||
| -rw-r--r-- | pigeonhole/src/lib-managesieve/managesieve-arg.c | 207 | ||||
| -rw-r--r-- | pigeonhole/src/lib-managesieve/managesieve-arg.h | 117 | ||||
| -rw-r--r-- | pigeonhole/src/lib-managesieve/managesieve-parser.c | 757 | ||||
| -rw-r--r-- | pigeonhole/src/lib-managesieve/managesieve-parser.h | 67 | ||||
| -rw-r--r-- | pigeonhole/src/lib-managesieve/managesieve-quote.c | 121 | ||||
| -rw-r--r-- | pigeonhole/src/lib-managesieve/managesieve-quote.h | 17 |
8 files changed, 1992 insertions, 0 deletions
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+#include "strescape.h" +#include "managesieve-arg.h" + +bool managesieve_arg_get_atom(const struct managesieve_arg *arg, + const char **str_r) +{ + if (arg->type != MANAGESIEVE_ARG_ATOM) + return FALSE; + + *str_r = arg->_data.str; + return TRUE; +} + +bool managesieve_arg_get_number(const struct managesieve_arg *arg, + uoff_t *number_r) +{ + const char *data; + uoff_t num = 0; + size_t i; + + if (arg->type != MANAGESIEVE_ARG_ATOM) + return FALSE; + + data = arg->_data.str; + for (i = 0; i < arg->str_len; i++) { + uoff_t newnum; + + if (data[i] < '0' || data[i] > '9') + return FALSE; + + newnum = num*10 + (data[i] -'0'); + if (newnum < num) + return FALSE; + + num = newnum; + } + + *number_r = num; + return TRUE; +} + +bool managesieve_arg_get_quoted(const struct managesieve_arg *arg, + const char **str_r) +{ + if (arg->type != MANAGESIEVE_ARG_STRING) + return FALSE; + + *str_r = arg->_data.str; + return TRUE; +} + +bool managesieve_arg_get_string(const struct managesieve_arg *arg, + const char **str_r) +{ + if (arg->type != MANAGESIEVE_ARG_STRING && + arg->type != MANAGESIEVE_ARG_LITERAL) + return FALSE; + + *str_r = arg->_data.str; + return TRUE; +} + +bool managesieve_arg_get_string_stream(const struct managesieve_arg *arg, + struct istream **stream_r) +{ + if (arg->type != MANAGESIEVE_ARG_STRING_STREAM) + return FALSE; + + *stream_r = arg->_data.str_stream; + return TRUE; +} + +bool managesieve_arg_get_list(const struct managesieve_arg *arg, + const struct managesieve_arg **list_r) +{ + unsigned int count; + + return managesieve_arg_get_list_full(arg, list_r, &count); +} + +bool managesieve_arg_get_list_full(const struct managesieve_arg *arg, + const struct managesieve_arg **list_r, + unsigned int *list_count_r) +{ + unsigned int count; + + if (arg->type != MANAGESIEVE_ARG_LIST) + return FALSE; + + *list_r = array_get(&arg->_data.list, &count); + + /* drop MANAGESIEVE_ARG_EOL from list size */ + i_assert(count > 0); + *list_count_r = count - 1; + return TRUE; +} + +const char *managesieve_arg_as_atom(const struct managesieve_arg *arg) +{ + const char *str; + + if (!managesieve_arg_get_atom(arg, &str)) + i_unreached(); + return str; +} + +const char *managesieve_arg_as_string(const struct managesieve_arg *arg) +{ + const char *str; + + if (!managesieve_arg_get_string(arg, &str)) + i_unreached(); + return str; +} + +struct istream * +managesieve_arg_as_string_stream(const struct managesieve_arg *arg) +{ + struct istream *stream; + + if (!managesieve_arg_get_string_stream(arg, &stream)) + i_unreached(); + return stream; +} + +const struct managesieve_arg * +managesieve_arg_as_list(const struct managesieve_arg *arg) +{ + const struct managesieve_arg *ret; + + if (!managesieve_arg_get_list(arg, &ret)) + i_unreached(); + return ret; +} + +bool managesieve_arg_atom_equals(const struct managesieve_arg *arg, + const char *str) +{ + const char *value; + + if (!managesieve_arg_get_atom(arg, &value)) + return FALSE; + return strcasecmp(value, str) == 0; +} + +void managesieve_write_arg(string_t *dest, const struct managesieve_arg *arg) +{ + const char *strval; + + switch (arg->type) { + case MANAGESIEVE_ARG_ATOM: + str_append(dest, managesieve_arg_as_atom(arg)); + break; + case MANAGESIEVE_ARG_STRING: + strval = managesieve_arg_as_string(arg); + str_append_c(dest, '"'); + str_append_escaped(dest, strval, strlen(strval)); + str_append_c(dest, '"'); + break; + case MANAGESIEVE_ARG_STRING_STREAM: + str_append(dest, "\"<too large>\""); + break; + case MANAGESIEVE_ARG_LITERAL: { + const char *strarg = managesieve_arg_as_string(arg); + str_printfa(dest, "{%zu}\r\n", + strlen(strarg)); + str_append(dest, strarg); + break; + } + case MANAGESIEVE_ARG_LIST: + str_append_c(dest, '('); + managesieve_write_args(dest, managesieve_arg_as_list(arg)); + str_append_c(dest, ')'); + break; + case MANAGESIEVE_ARG_NONE: + case MANAGESIEVE_ARG_EOL: + i_unreached(); + } +} + +void managesieve_write_args(string_t *dest, const struct managesieve_arg *args) +{ + bool first = TRUE; + + for (; !MANAGESIEVE_ARG_IS_EOL(args); args++) { + if (first) + first = FALSE; + else + str_append_c(dest, ' '); + managesieve_write_arg(dest, args); + } +} + +const char *managesieve_args_to_str(const struct managesieve_arg *args) +{ + string_t *str; + + str = t_str_new(128); + managesieve_write_args(str, args); + return str_c(str); +} + diff --git a/pigeonhole/src/lib-managesieve/managesieve-arg.h b/pigeonhole/src/lib-managesieve/managesieve-arg.h new file mode 100644 index 0000000..23f7c05 --- /dev/null +++ b/pigeonhole/src/lib-managesieve/managesieve-arg.h @@ -0,0 +1,117 @@ +#ifndef MANAGESIEVE_ARG_H +#define MANAGESIEVE_ARG_H + +#include "array.h" + +/* + * QUOTED-SPECIALS = <"> / "\" + */ +#define IS_QUOTED_SPECIAL(c) \ + ((c) == '"' || (c) == '\\') + +/* + * ATOM-SPECIALS = "(" / ")" / "{" / SP / CTL / QUOTED-SPECIALS + */ +#define IS_ATOM_SPECIAL(c) \ + ((c) == '(' || (c) == ')' || (c) == '{' || \ + (c) <= 32 || (c) == 0x7f || \ + IS_QUOTED_SPECIAL(c)) + +/* + * CHAR = %x01-7F + */ +#define IS_CHAR(c) \ + (((c) & 0x80) == 0) + +/* + * TEXT-CHAR = %x01-09 / %x0B-0C / %x0E-7F + * ;; any CHAR except CR and LF + */ +#define IS_TEXT_CHAR(c) \ + (IS_CHAR(c) && (c) != '\r' && (c) != '\n') + +/* + * SAFE-CHAR = %x01-09 / %x0B-0C / %x0E-21 / + * %x23-5B / %x5D-7F + * ;; any TEXT-CHAR except QUOTED-SPECIALS + */ +#define IS_SAFE_CHAR(c) \ + (IS_TEXT_CHAR(c) && !IS_QUOTED_SPECIAL(c)) + +enum managesieve_arg_type { + MANAGESIEVE_ARG_NONE = 0, + MANAGESIEVE_ARG_ATOM, + MANAGESIEVE_ARG_STRING, + MANAGESIEVE_ARG_STRING_STREAM, + + MANAGESIEVE_ARG_LIST, + + /* literals are returned as MANAGESIEVE_ARG_STRING by default */ + MANAGESIEVE_ARG_LITERAL, + + MANAGESIEVE_ARG_EOL /* end of argument list */ +}; + +ARRAY_DEFINE_TYPE(managesieve_arg_list, struct managesieve_arg); +struct managesieve_arg { + enum managesieve_arg_type type; + /* parent argument; always of type MANAGESIEVE_ARG_LIST */ + struct managesieve_arg *parent; + + /* Set when _data.str is set */ + size_t str_len; + + union { + const char *str; + struct istream *str_stream; + ARRAY_TYPE(managesieve_arg_list) list; + } _data; +}; + +#define MANAGESIEVE_ARG_IS_EOL(arg) \ + ((arg)->type == MANAGESIEVE_ARG_EOL) + +bool managesieve_arg_get_atom(const struct managesieve_arg *arg, + const char **str_r) ATTR_WARN_UNUSED_RESULT; +bool managesieve_arg_get_number(const struct managesieve_arg *arg, + uoff_t *number_r) ATTR_WARN_UNUSED_RESULT; +bool managesieve_arg_get_quoted(const struct managesieve_arg *arg, + const char **str_r) ATTR_WARN_UNUSED_RESULT; +bool managesieve_arg_get_string(const struct managesieve_arg *arg, + const char **str_r) ATTR_WARN_UNUSED_RESULT; + +bool managesieve_arg_get_string_stream(const struct managesieve_arg *arg, + struct istream **stream_r) + ATTR_WARN_UNUSED_RESULT; + +bool managesieve_arg_get_list(const struct managesieve_arg *arg, + const struct managesieve_arg **list_r) + ATTR_WARN_UNUSED_RESULT; +bool managesieve_arg_get_list_full(const struct managesieve_arg *arg, + const struct managesieve_arg **list_r, + unsigned int *list_count_r) + ATTR_WARN_UNUSED_RESULT; + +/* Similar to above, but assumes that arg is already of correct type. */ +const char *managesieve_arg_as_atom(const struct managesieve_arg *arg); +const char *managesieve_arg_as_string(const struct managesieve_arg *arg); +struct istream * +managesieve_arg_as_string_stream(const struct managesieve_arg *arg); +const struct managesieve_arg * +managesieve_arg_as_list(const struct managesieve_arg *arg); + +/* Returns TRUE if arg is atom and case-insensitively matches str */ +bool managesieve_arg_atom_equals(const struct managesieve_arg *arg, + const char *str); + +/* Write ManageSieve arg to the given string. Because + MANAGESIVE_ARG_LITERAL_SIZE* have no content, they're written as + "{size}\r\n<too large>". */ +void managesieve_write_arg(string_t *dest, const struct managesieve_arg *arg); +/* Same as managesieve_write_arg(), but write all the args until EOL. */ +void managesieve_write_args(string_t *dest, const struct managesieve_arg *args); +/* Like managesieve_write_args(), but return the string allocated from data + stack. */ +const char *managesieve_args_to_str(const struct managesieve_arg *args); + +#endif diff --git a/pigeonhole/src/lib-managesieve/managesieve-parser.c b/pigeonhole/src/lib-managesieve/managesieve-parser.c new file mode 100644 index 0000000..546e431 --- /dev/null +++ b/pigeonhole/src/lib-managesieve/managesieve-parser.c @@ -0,0 +1,757 @@ +/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file + */ + +#include "lib.h" +#include "unichar.h" +#include "istream-private.h" +#include "ostream.h" +#include "strescape.h" +#include "managesieve-parser.h" + +#define is_linebreak(c) \ + ((c) == '\r' || (c) == '\n') + +#define LIST_INIT_COUNT 7 + +enum arg_parse_type { + ARG_PARSE_NONE = 0, + ARG_PARSE_ATOM, + ARG_PARSE_STRING, + ARG_PARSE_LITERAL, + ARG_PARSE_LITERAL_DATA +}; + +struct managesieve_parser { + /* permanent */ + pool_t pool; + struct istream *input; + size_t max_line_size; + enum managesieve_parser_flags flags; + + /* reset by managesieve_parser_reset(): */ + size_t line_size; + ARRAY_TYPE(managesieve_arg_list) root_list; + ARRAY_TYPE(managesieve_arg_list) *cur_list; + struct managesieve_arg *list_arg; + + enum arg_parse_type cur_type; + size_t cur_pos; /* parser position in input buffer */ + + int str_first_escape; /* ARG_PARSE_STRING: index to first '\' */ + uoff_t literal_size; /* ARG_PARSE_LITERAL: string size */ + + struct istream *str_stream; + + const char *error; + + bool literal_skip_crlf:1; + bool literal_nonsync:1; + bool eol:1; + bool fatal_error:1; +}; + +static struct istream *quoted_string_istream_create + (struct managesieve_parser *parser); + +struct managesieve_parser * +managesieve_parser_create(struct istream *input, size_t max_line_size) +{ + struct managesieve_parser *parser; + + parser = i_new(struct managesieve_parser, 1); + parser->pool = pool_alloconly_create("MANAGESIEVE parser", 8192); + parser->input = input; + parser->max_line_size = max_line_size; + + p_array_init(&parser->root_list, parser->pool, LIST_INIT_COUNT); + parser->cur_list = &parser->root_list; + return parser; +} + +void managesieve_parser_destroy(struct managesieve_parser **parser) +{ + i_stream_unref(&(*parser)->str_stream); + + pool_unref(&(*parser)->pool); + i_free(*parser); + *parser = NULL; +} + +void managesieve_parser_reset(struct managesieve_parser *parser) +{ + p_clear(parser->pool); + + parser->line_size = 0; + + p_array_init(&parser->root_list, parser->pool, LIST_INIT_COUNT); + parser->cur_list = &parser->root_list; + parser->list_arg = NULL; + + parser->cur_type = ARG_PARSE_NONE; + parser->cur_pos = 0; + + parser->str_first_escape = 0; + parser->literal_size = 0; + + parser->error = NULL; + + parser->literal_skip_crlf = FALSE; + parser->eol = FALSE; + + i_stream_unref(&parser->str_stream); +} + +const char * +managesieve_parser_get_error(struct managesieve_parser *parser, bool *fatal) +{ + *fatal = parser->fatal_error; + return parser->error; +} + +/* Skip over everything parsed so far, plus the following whitespace */ +static bool +managesieve_parser_skip_to_next(struct managesieve_parser *parser, + const unsigned char **data, size_t *data_size) +{ + size_t i; + + for (i = parser->cur_pos; i < *data_size; i++) { + if ((*data)[i] != ' ') + break; + } + + parser->line_size += i; + i_stream_skip(parser->input, i); + parser->cur_pos = 0; + + *data += i; + *data_size -= i; + return *data_size > 0; +} + +static struct managesieve_arg * +managesieve_arg_create(struct managesieve_parser *parser) +{ + struct managesieve_arg *arg; + + arg = array_append_space(parser->cur_list); + arg->parent = parser->list_arg; + + return arg; +} + +static void +managesieve_parser_save_arg(struct managesieve_parser *parser, + const unsigned char *data, size_t size) +{ + struct managesieve_arg *arg; + char *str; + + arg = managesieve_arg_create(parser); + + switch (parser->cur_type) { + case ARG_PARSE_ATOM: + /* Simply save the string */ + arg->type = MANAGESIEVE_ARG_ATOM; + arg->_data.str = p_strndup(parser->pool, data, size); + arg->str_len = size; + break; + case ARG_PARSE_STRING: + /* Data is quoted and may contain escapes. */ + if ((parser->flags & + MANAGESIEVE_PARSE_FLAG_STRING_STREAM) != 0) { + arg->type = MANAGESIEVE_ARG_STRING_STREAM; + arg->_data.str_stream = parser->str_stream; + } else { + i_assert(size > 0); + + arg->type = MANAGESIEVE_ARG_STRING; + str = p_strndup(parser->pool, data+1, size-1); + + /* remove the escapes */ + if (parser->str_first_escape >= 0 && + (parser->flags & + MANAGESIEVE_PARSE_FLAG_NO_UNESCAPE) == 0) + (void)str_unescape(str); + + arg->_data.str = str; + arg->str_len = strlen(str); + } + break; + case ARG_PARSE_LITERAL_DATA: + if ((parser->flags & + MANAGESIEVE_PARSE_FLAG_STRING_STREAM) != 0) { + arg->type = MANAGESIEVE_ARG_STRING_STREAM; + arg->_data.str_stream = parser->str_stream; + } else if ((parser->flags & + MANAGESIEVE_PARSE_FLAG_LITERAL_TYPE) != 0) { + arg->type = MANAGESIEVE_ARG_LITERAL; + arg->_data.str = p_strndup(parser->pool, data, size); + arg->str_len = size; + } else { + arg->type = MANAGESIEVE_ARG_STRING; + arg->_data.str = p_strndup(parser->pool, data, size); + arg->str_len = size; + } + break; + default: + i_unreached(); + } + + parser->cur_type = ARG_PARSE_NONE; +} + +static bool is_valid_atom_char(struct managesieve_parser *parser, char chr) +{ + if (IS_ATOM_SPECIAL((unsigned char)chr)) { + parser->error = "Invalid characters in atom"; + return FALSE; + } else if ((((unsigned char)chr) & 0x80) != 0) { + parser->error = "8bit data in atom"; + return FALSE; + } + + return TRUE; +} + +static bool +managesieve_parser_read_atom(struct managesieve_parser *parser, + const unsigned char *data, size_t data_size) +{ + size_t i; + + /* Read until we've found space, CR or LF. */ + for (i = parser->cur_pos; i < data_size; i++) { + if (data[i] == ' ' || data[i] == ')' || + is_linebreak(data[i])) { + managesieve_parser_save_arg(parser, data, i); + break; + } else if (!is_valid_atom_char(parser, data[i])) + return FALSE; + } + + parser->cur_pos = i; + return (parser->cur_type == ARG_PARSE_NONE); +} + +static bool +managesieve_parser_read_string(struct managesieve_parser *parser, + const unsigned char *data, size_t data_size) +{ + size_t i; + + /* QUOTED-CHAR = SAFE-UTF8-CHAR / "\" QUOTED-SPECIALS + quoted = <"> *QUOTED-CHAR <"> + ;; limited to 1024 octets between the <">s + */ + + /* Read until we've found non-escaped ", CR or LF */ + for (i = parser->cur_pos; i < data_size; i++) { + if (data[i] == '"') { + if (!uni_utf8_data_is_valid(data+1, i-1)) { + parser->error = + "Invalid UTF-8 character in quoted-string."; + return FALSE; + } + + managesieve_parser_save_arg(parser, data, i); + i++; /* skip the trailing '"' too */ + break; + } + + if (data[i] == '\0') { + parser->error = "NULs not allowed in strings"; + return FALSE; + } + + if (data[i] == '\\') { + if (i+1 == data_size) { + /* Known data ends with '\' - leave it to next + time as well if it happens to be \" */ + break; + } + + /* Save the first escaped char */ + if (parser->str_first_escape < 0) + parser->str_first_escape = i; + + /* Skip the escaped char */ + i++; + + if (!IS_QUOTED_SPECIAL(data[i])) { + parser->error = + "Escaped quoted-string character is not a QUOTED-SPECIAL."; + return FALSE; + } + continue; + } + + if ((data[i] & 0x80) == 0 && !IS_SAFE_CHAR(data[i])) { + parser->error = "String contains invalid character."; + return FALSE; + } + } + + parser->cur_pos = i; + return (parser->cur_type == ARG_PARSE_NONE); +} + +static bool managesieve_parser_literal_end(struct managesieve_parser *parser) +{ + if ((parser->flags & MANAGESIEVE_PARSE_FLAG_STRING_STREAM) == 0) { + if (parser->line_size >= parser->max_line_size || + (parser->literal_size > + (parser->max_line_size - parser->line_size))) { + /* Too long string, abort. */ + parser->error = "Literal size too large"; + parser->fatal_error = TRUE; + return FALSE; + } + } + + parser->cur_type = ARG_PARSE_LITERAL_DATA; + parser->literal_skip_crlf = TRUE; + + parser->cur_pos = 0; + return TRUE; +} + +static bool +managesieve_parser_read_literal(struct managesieve_parser *parser, + const unsigned char *data, size_t data_size) +{ + size_t i; + + /* Expecting digits + "}" */ + for (i = parser->cur_pos; i < data_size; i++) { + if (data[i] == '}') { + parser->line_size += i+1; + i_stream_skip(parser->input, i+1); + + return managesieve_parser_literal_end(parser); + } + + if (parser->literal_nonsync) { + parser->error = "Expecting '}' after '+'"; + return FALSE; + } + + if (data[i] == '+') { + parser->literal_nonsync = TRUE; + continue; + } + + if (data[i] < '0' || data[i] > '9') { + parser->error = "Invalid literal size"; + return FALSE; + } + + if (parser->literal_size >= ((uoff_t)-1 / 10)) { + if (parser->literal_size > ((uoff_t)-1 / 10) || + (uoff_t)(data[i] - '0') > ((uoff_t)-1 % 10)) { + parser->error = "Literal size too large"; + return FALSE; + } + } + parser->literal_size = parser->literal_size * 10 + + (data[i] - '0'); + } + + parser->cur_pos = i; + return FALSE; +} + +static bool +managesieve_parser_read_literal_data(struct managesieve_parser *parser, + const unsigned char *data, + size_t data_size) +{ + if (parser->literal_skip_crlf) { + /* Skip \r\n or \n, anything else gives an error */ + if (data_size == 0) + return FALSE; + + if (*data == '\r') { + parser->line_size++; + data++; data_size--; + i_stream_skip(parser->input, 1); + + if (data_size == 0) + return FALSE; + } + + if (*data != '\n') { + parser->error = "Missing LF after literal size"; + return FALSE; + } + + parser->line_size++; + data++; data_size--; + i_stream_skip(parser->input, 1); + + parser->literal_skip_crlf = FALSE; + + i_assert(parser->cur_pos == 0); + } + + if ((parser->flags & MANAGESIEVE_PARSE_FLAG_STRING_STREAM) == 0) { + /* Now we just wait until we've read enough data */ + if (data_size < parser->literal_size) { + return FALSE; + } else { + if (!uni_utf8_data_is_valid( + data, (size_t)parser->literal_size)) { + parser->error = + "Invalid UTF-8 character in literal string."; + return FALSE; + } + + managesieve_parser_save_arg( + parser, data, (size_t)parser->literal_size); + parser->cur_pos = (size_t)parser->literal_size; + return TRUE; + } + } else { + /* We don't read the data; we just create a stream for the + literal */ + parser->eol = TRUE; + parser->str_stream = i_stream_create_limit( + parser->input, parser->literal_size); + managesieve_parser_save_arg(parser, NULL, 0); + return TRUE; + } +} + +/* Returns TRUE if argument was fully processed. Also returns TRUE if an + argument inside a list was processed. */ +static bool managesieve_parser_read_arg(struct managesieve_parser *parser) +{ + const unsigned char *data; + size_t data_size; + + data = i_stream_get_data(parser->input, &data_size); + if (data_size == 0) + return FALSE; + + while (parser->cur_type == ARG_PARSE_NONE) { + /* We haven't started parsing yet */ + if (!managesieve_parser_skip_to_next(parser, &data, &data_size)) + return FALSE; + i_assert(parser->cur_pos == 0); + + switch (data[0]) { + case '\r': + case '\n': + /* Unexpected end of line */ + parser->eol = TRUE; + return FALSE; + case '"': + parser->cur_type = ARG_PARSE_STRING; + parser->str_first_escape = -1; + break; + case '{': + parser->cur_type = ARG_PARSE_LITERAL; + parser->literal_size = 0; + parser->literal_nonsync = FALSE; + break; + default: + if (!is_valid_atom_char(parser, data[0])) + return FALSE; + parser->cur_type = ARG_PARSE_ATOM; + break; + } + parser->cur_pos++; + } + + i_assert(data_size > 0); + + switch (parser->cur_type) { + case ARG_PARSE_ATOM: + if (!managesieve_parser_read_atom(parser, data, data_size)) + return FALSE; + break; + case ARG_PARSE_STRING: + if ((parser->flags & + MANAGESIEVE_PARSE_FLAG_STRING_STREAM) != 0) { + parser->eol = TRUE; + parser->line_size += parser->cur_pos; + i_stream_skip(parser->input, parser->cur_pos); + parser->cur_pos = 0; + parser->str_stream = + quoted_string_istream_create(parser); + managesieve_parser_save_arg(parser, NULL, 0); + + } else if (!managesieve_parser_read_string(parser, + data, data_size)) { + return FALSE; + } + break; + case ARG_PARSE_LITERAL: + if (!managesieve_parser_read_literal(parser, data, data_size)) + return FALSE; + + /* Pass through to parsing data. since input->skip was + modified, we need to get the data start position again. */ + data = i_stream_get_data(parser->input, &data_size); + + /* fall through */ + case ARG_PARSE_LITERAL_DATA: + if (!managesieve_parser_read_literal_data(parser, + data, data_size)) + return FALSE; + break; + default: + i_unreached(); + } + + i_assert(parser->cur_type == ARG_PARSE_NONE); + return TRUE; +} + +/* ARG_PARSE_NONE checks that last argument isn't only partially parsed. */ +#define IS_UNFINISHED(parser) \ + ((parser)->cur_type != ARG_PARSE_NONE || \ + (parser)->cur_list != &parser->root_list) + +static int +finish_line(struct managesieve_parser *parser, unsigned int count, + const struct managesieve_arg **args_r) +{ + struct managesieve_arg *arg; + int ret = array_count(&parser->root_list); + + parser->line_size += parser->cur_pos; + i_stream_skip(parser->input, parser->cur_pos); + parser->cur_pos = 0; + + /* Fill the missing parameters with NILs */ + while (count > array_count(&parser->root_list)) { + arg = array_append_space(&parser->root_list); + arg->type = MANAGESIEVE_ARG_NONE; + } + arg = array_append_space(&parser->root_list); + arg->type = MANAGESIEVE_ARG_EOL; + + *args_r = array_get(&parser->root_list, &count); + return ret; +} + +int managesieve_parser_read_args(struct managesieve_parser *parser, + unsigned int count, + enum managesieve_parser_flags flags, + const struct managesieve_arg **args_r) +{ + parser->flags = flags; + + while (!parser->eol && (count == 0 || IS_UNFINISHED(parser) || + array_count(&parser->root_list) < count)) { + if (!managesieve_parser_read_arg(parser)) + break; + + if (parser->line_size > parser->max_line_size) { + parser->error = "MANAGESIEVE command line too large"; + break; + } + } + + if (parser->error != NULL) { + /* Error, abort */ + parser->line_size += parser->cur_pos; + i_stream_skip(parser->input, parser->cur_pos); + parser->cur_pos = 0; + *args_r = NULL; + return -1; + } else if ((!IS_UNFINISHED(parser) && count > 0 && + array_count(&parser->root_list) >= count) || parser->eol) { + /* All arguments read / end of line. */ + return finish_line(parser, count, args_r); + } else { + /* Need more data */ + *args_r = NULL; + return -2; + } +} + +int managesieve_parser_finish_line(struct managesieve_parser *parser, + unsigned int count, + enum managesieve_parser_flags flags, + const struct managesieve_arg **args_r) +{ + const unsigned char *data; + size_t data_size; + int ret; + + ret = managesieve_parser_read_args(parser, count, flags, args_r); + if (ret == -2) { + /* We should have noticed end of everything except atom */ + if (parser->cur_type == ARG_PARSE_ATOM) { + data = i_stream_get_data(parser->input, &data_size); + managesieve_parser_save_arg(parser, data, data_size); + } + } + return finish_line(parser, count, args_r); +} + +const char *managesieve_parser_read_word(struct managesieve_parser *parser) +{ + const unsigned char *data; + size_t i, data_size; + + data = i_stream_get_data(parser->input, &data_size); + + for (i = 0; i < data_size; i++) { + if (data[i] == ' ' || data[i] == '\r' || data[i] == '\n') + break; + } + + if (i < data_size) { + data_size = i + (data[i] == ' ' ? 1 : 0); + parser->line_size += data_size; + i_stream_skip(parser->input, data_size); + return p_strndup(parser->pool, data, i); + } else { + return NULL; + } +} + +/* + * Quoted string stream + */ + +struct quoted_string_istream { + struct istream_private istream; + + /* The end '"' was found */ + bool str_end:1; +}; + +static int +quoted_string_istream_read_parent(struct quoted_string_istream *qsstream, + unsigned int min_bytes) +{ + struct istream_private *stream = &qsstream->istream; + size_t size, avail; + ssize_t ret; + + size = i_stream_get_data_size(stream->parent); + while (size < min_bytes) { + ret = i_stream_read_memarea(stream->parent); + if (ret <= 0) { + if (ret == -2) { + /* Tiny parent buffer size - shouldn't happen */ + return -2; + } + stream->istream.stream_errno = + stream->parent->stream_errno; + stream->istream.eof = stream->parent->eof; + if (ret == -1 && stream->istream.stream_errno == 0) { + io_stream_set_error(&stream->iostream, + "Quoted string ends without closing quotes"); + stream->istream.stream_errno = EPIPE; + } + return ret; + } + size = i_stream_get_data_size(stream->parent); + } + + if (!i_stream_try_alloc(stream, size, &avail)) + return -2; + return 1; +} + +static ssize_t quoted_string_istream_read(struct istream_private *stream) +{ + struct quoted_string_istream *qsstream = + (struct quoted_string_istream *)stream; + const unsigned char *data; + unsigned int extra; + size_t i, dest, size; + ssize_t ret; + + if (qsstream->str_end) { + stream->istream.eof = TRUE; + return -1; + } + + ret = quoted_string_istream_read_parent(qsstream, 1); + if (ret <= 0) + return ret; + + /* @UNSAFE */ + dest = stream->pos; + extra = 0; + + data = i_stream_get_data(stream->parent, &size); + for (i = 0; i < size && dest < stream->buffer_size; ) { + if (data[i] == '"') { + i++; + qsstream->str_end = TRUE; + if (dest == stream->pos) { + i_stream_skip(stream->parent, i); + stream->istream.eof = TRUE; + return -1; + } + break; + } else if (data[i] == '\\') { + if (i+1 == size) { + /* Not enough input for \x */ + extra = 1; + break; + } + i++; + + if (!IS_QUOTED_SPECIAL(data[i])) { + /* Invalid string */ + io_stream_set_error(&stream->iostream, + "Escaped quoted-string character is not a QUOTED-SPECIAL"); + stream->istream.stream_errno = EINVAL; + return -1; + } + stream->w_buffer[dest++] = data[i]; + i++; + } else { + if (data[i] == '\r' || data[i] == '\n') { + io_stream_set_error(&stream->iostream, + "Quoted string contains an invalid character"); + stream->istream.stream_errno = EINVAL; + return -1; + } + + stream->w_buffer[dest++] = data[i]; + i++; + } + i_assert(dest <= stream->buffer_size); + } + i_stream_skip(stream->parent, i); + + ret = dest - stream->pos; + if (ret == 0) { + /* Not enough input */ + i_assert(i == 0); + i_assert(extra > 0); + ret = quoted_string_istream_read_parent(qsstream, extra+1); + if (ret <= 0) + return ret; + return quoted_string_istream_read(stream); + } + i_assert(ret > 0); + stream->pos = dest; + return ret; +} + +static struct +istream *quoted_string_istream_create(struct managesieve_parser *parser) +{ + struct quoted_string_istream *qsstream; + + qsstream = i_new(struct quoted_string_istream, 1); + qsstream->istream.max_buffer_size = + parser->input->real_stream->max_buffer_size; + qsstream->istream.read = quoted_string_istream_read; + + qsstream->istream.istream.readable_fd = FALSE; + qsstream->istream.istream.blocking = parser->input->blocking; + qsstream->istream.istream.seekable = FALSE; + return i_stream_create(&qsstream->istream, parser->input, + i_stream_get_fd(parser->input), 0); +} diff --git a/pigeonhole/src/lib-managesieve/managesieve-parser.h b/pigeonhole/src/lib-managesieve/managesieve-parser.h new file mode 100644 index 0000000..93e67ae --- /dev/null +++ b/pigeonhole/src/lib-managesieve/managesieve-parser.h @@ -0,0 +1,67 @@ +#ifndef MANAGESIEVE_PARSER_H +#define MANAGESIEVE_PARSER_H + +#include "managesieve-arg.h" + +enum managesieve_parser_flags { + /* Set this flag if you want to read a string argument as as stream. + Useful when you need to deal with large strings. The string must be + the last read argument. */ + MANAGESIEVE_PARSE_FLAG_STRING_STREAM = 0x01, + /* Don't remove '\' chars from string arguments */ + MANAGESIEVE_PARSE_FLAG_NO_UNESCAPE = 0x02, + /* Return literals as MANAGESIEVE_ARG_LITERAL instead of + MANAGESIEVE_ARG_STRING */ + MANAGESIEVE_PARSE_FLAG_LITERAL_TYPE = 0x04 +}; + +struct managesieve_parser; + +/* Create new MANAGESIEVE argument parser. + + max_line_size can be used to approximately limit the maximum amount of memory + that gets allocated when parsing a line. Input buffer size limits the maximum + size of each parsed token. + + Usually the largest lines are large only because they have a one huge message + set token, so you'll probably want to keep input buffer size the same as + max_line_size. That means the maximum memory usage is around + 2 * max_line_size. */ +struct managesieve_parser * +managesieve_parser_create(struct istream *input, size_t max_line_size); +void managesieve_parser_destroy(struct managesieve_parser **parser); + +/* Reset the parser to initial state. */ +void managesieve_parser_reset(struct managesieve_parser *parser); + +/* Return the last error in parser. fatal is set to TRUE if there's no way to + continue parsing, currently only if too large non-sync literal size was + given. */ +const char * +managesieve_parser_get_error(struct managesieve_parser *parser, bool *fatal); + +/* Read a number of arguments. This function doesn't call i_stream_read(), you + need to do that. Returns number of arguments read (may be less than count + in case of EOL), -2 if more data is needed or -1 if error occurred. + + count-sized array of arguments are stored into args when return value is 0 or + larger. If all arguments weren't read, they're set to NIL. count can be set + to 0 to read all arguments in the line. Last element in args is always of + type MANAGESIEVE_ARG_EOL. */ +int managesieve_parser_read_args(struct managesieve_parser *parser, + unsigned int count, + enum managesieve_parser_flags flags, + const struct managesieve_arg **args_r); + +/* Just like managesieve_parser_read_args(), but assume \n at end of data in + input stream. */ +int managesieve_parser_finish_line(struct managesieve_parser *parser, + unsigned int count, + enum managesieve_parser_flags flags, + const struct managesieve_arg **args_r); + +/* Read one word - used for reading command name. Returns NULL if more data is + needed. */ +const char *managesieve_parser_read_word(struct managesieve_parser *parser); + +#endif diff --git a/pigeonhole/src/lib-managesieve/managesieve-quote.c b/pigeonhole/src/lib-managesieve/managesieve-quote.c new file mode 100644 index 0000000..a86818c --- /dev/null +++ b/pigeonhole/src/lib-managesieve/managesieve-quote.c @@ -0,0 +1,121 @@ +/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file + */ + +#include "lib.h" +#include "str.h" +#include "unichar.h" +#include "managesieve-parser.h" +#include "managesieve-quote.h" + +/* Turn the value string into a valid MANAGESIEVE string or literal, no matter + * what. QUOTED-SPECIALS are escaped, but any invalid (UTF-8) character + * is simply removed. Linebreak characters are not considered invalid, but + * they do force the generation of a string literal. + */ +void managesieve_quote_append(string_t *str, const unsigned char *value, + size_t value_len, bool compress_lwsp) +{ + size_t i, extra = 0, escape = 0; + string_t *tmp; + bool + last_lwsp = TRUE, + literal = FALSE, + modify = FALSE; + + if (value == NULL) { + str_append(str, "\"\""); + return; + } + + if (value_len == (size_t)-1) + value_len = strlen((const char *) value); + + for (i = 0; i < value_len; i++) { + switch (value[i]) { + case ' ': + case '\t': + if (last_lwsp && compress_lwsp) { + modify = TRUE; + extra++; + } + last_lwsp = TRUE; + break; + case '"': + case '\\': + escape++; + last_lwsp = FALSE; + break; + case 13: + case 10: + literal = TRUE; + last_lwsp = TRUE; + break; + default: + last_lwsp = FALSE; + } + } + + if (!literal) { + /* no linebreak chars, return as (escaped) "string" */ + str_append_c(str, '"'); + } else { + /* return as literal */ + str_printfa(str, "{%zu}\r\n", value_len - extra); + } + + tmp = t_str_new(value_len+escape+4); + if (!modify && (literal || escape == 0)) + str_append_data(tmp, value, value_len); + else { + last_lwsp = TRUE; + for (i = 0; i < value_len; i++) { + switch (value[i]) { + case '"': + case '\\': + last_lwsp = FALSE; + if (!literal) + str_append_c(tmp, '\\'); + str_append_c(tmp, value[i]); + break; + case ' ': + case '\t': + if (!last_lwsp || !compress_lwsp) + str_append_c(tmp, ' '); + last_lwsp = TRUE; + break; + case 13: + case 10: + last_lwsp = TRUE; + str_append_c(tmp, value[i]); + break; + default: + last_lwsp = FALSE; + str_append_c(tmp, value[i]); + break; + } + } + } + + if ( uni_utf8_get_valid_data(str_data(tmp), str_len(tmp), str) ) + str_append_str(str, tmp); + + if (!literal) + str_append_c(str, '"'); +} + +char *managesieve_quote(pool_t pool, const unsigned char *value, size_t value_len) +{ + string_t *str; + char *ret; + + if (value == NULL) + return "\"\""; + + T_BEGIN { + str = t_str_new(value_len + MAX_INT_STRLEN + 5); + managesieve_quote_append(str, value, value_len, TRUE); + ret = p_strndup(pool, str_data(str), str_len(str)); + } T_END; + + return ret; +} diff --git a/pigeonhole/src/lib-managesieve/managesieve-quote.h b/pigeonhole/src/lib-managesieve/managesieve-quote.h new file mode 100644 index 0000000..cae5491 --- /dev/null +++ b/pigeonhole/src/lib-managesieve/managesieve-quote.h @@ -0,0 +1,17 @@ +#ifndef IMAP_QUOTE_H +#define IMAP_QUOTE_H + +/* Return value suitable for sending to client, either as quoted-string or + literal. Note that this also converts TABs into spaces, multiple spaces + into single space and NULs to #128. */ +char *managesieve_quote(pool_t pool, const unsigned char *value, size_t value_len); + +/* Append to existing string. */ +void managesieve_quote_append(string_t *str, const unsigned char *value, + size_t value_len, bool compress_lwsp); + +#define managesieve_quote_append_string(str, value, compress_lwsp) \ + managesieve_quote_append(str, (const unsigned char *)(value), \ + (size_t)-1, compress_lwsp) + +#endif |