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file-stat-before-action-cpp.yml
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id: file-stat-before-action-cpp
language: cpp
severity: warning
message: >-
A check is done with `stat` and then the file is used. There is no guarantee that the status of the file has not changed since the call to `stat` which may allow attackers to bypass permission checks.
note: >-
[CWE-367]: Time-of-check Time-of-use (TOCTOU) Race Condition
[REFERENCES]
- https://wiki.sei.cmu.edu/confluence/display/c/FIO45-C.+Avoid+TOCTOU+race+conditions+while+accessing+files
ast-grep-essentials: true
utils:
PATTERN_1(identifier)nth1:
kind: identifier
regex: ^(fopen|freopen|remove|rename|access|open|stat|lstat|unlink|mkdir|rmdir|chdir)$
all:
- precedes:
kind: argument_list
has:
pattern: $SRC
- inside:
kind: call_expression
all:
- not:
inside:
stopBy: end
kind: condition_clause
- not:
inside:
kind: field_expression
inside:
stopBy: end
kind: compound_statement
inside:
kind: if_statement
has:
kind: condition_clause
has:
stopBy: end
any:
- kind: binary_expression
has:
stopBy: end
kind: parenthesized_expression
has:
kind: binary_expression
all:
- has:
kind: call_expression
nthChild: 1
all:
- has:
kind: identifier
regex: ^(stat|_stat|lstat|_lstat)$
precedes:
kind: argument_list
all:
- has:
nthChild: 1
pattern: $SRC
- has:
kind: number_literal
regex: ^(0)$
- kind: binary_expression
all:
- has:
nthChild: 1
kind: call_expression
all:
- has:
nthChild: 1
kind: identifier
regex: ^(stat|_stat|lstat|_lstat)$
- has:
nthChild: 2
kind: argument_list
all:
- has:
nthChild: 1
pattern: $SRC
- has:
nthChild: 2
kind: number_literal
regex: ^(0)$
follows:
regex: ^==$
PATTERN_2(qualified_identifier)nth1:
kind: qualified_identifier
any:
- regex: ^(folly::readFile|folly::writeFile|folly::writeFileAtomic|folly::writeFileAtomicNoThrow|folly::File)$
- regex: ^(boost::)?(filesystem::file_size|filesystem::create_directory|filesystem::create_directories|filesystem::remove|filesystem::remove_all|filesystem::rename|filesystem::copy_file|filesystem::copy|filesystem::copy_directory|filesystem::resize_file|filesystem::last_write_time|filesystem::permissions|filesystem::symlink_status|filesystem::create_symlink|filesystem::create_hard_link|filesystem::read_symlink)$
all:
- precedes:
kind: argument_list
has:
pattern: $SRC
- inside:
kind: call_expression
all:
- not:
inside:
stopBy: end
kind: condition_clause
- not:
inside:
kind: field_expression
inside:
stopBy: end
kind: compound_statement
inside:
kind: if_statement
has:
kind: condition_clause
has:
stopBy: end
any:
- kind: binary_expression
has:
stopBy: end
kind: parenthesized_expression
has:
kind: binary_expression
all:
- has:
kind: call_expression
nthChild: 1
all:
- has:
kind: identifier
regex: ^(stat|_stat|lstat|_lstat)$
precedes:
kind: argument_list
all:
- has:
nthChild: 1
pattern: $SRC
- has:
kind: number_literal
regex: ^(0)$
follows:
regex: ^==$
- kind: binary_expression
all:
- has:
nthChild: 1
kind: call_expression
all:
- has:
nthChild: 1
kind: identifier
regex: ^(stat|_stat|lstat|_lstat)$
- has:
nthChild: 2
kind: argument_list
all:
- has:
nthChild: 1
pattern: $SRC
- has:
nthChild: 2
kind: number_literal
regex: ^(0)$
follows:
regex: ^==$
PATTERN_1(identifier)nth2:
kind: identifier
regex: ^(fopen|freopen|remove|rename|access|open|stat|lstat|unlink|mkdir|rmdir|chdir)$
all:
- precedes:
kind: argument_list
has:
pattern: $SRC
- inside:
kind: call_expression
all:
- not:
inside:
stopBy: end
kind: condition_clause
- not:
inside:
kind: field_expression
inside:
stopBy: end
kind: compound_statement
inside:
kind: if_statement
has:
kind: condition_clause
has:
stopBy: end
any:
- kind: binary_expression
has:
stopBy: end
kind: parenthesized_expression
has:
kind: binary_expression
all:
- has:
kind: call_expression
nthChild: 1
all:
- has:
kind: identifier
regex: ^(fstatat|_fstatat)$
precedes:
kind: argument_list
all:
- has:
nthChild: 3
pattern: $SRC
- has:
kind: number_literal
regex: ^(0)$
follows:
regex: ^==$
- kind: binary_expression
all:
- has:
nthChild: 1
kind: call_expression
all:
- has:
nthChild: 1
kind: identifier
regex: ^(fstatat|_fstatat)$
- has:
nthChild: 2
kind: argument_list
all:
- has:
nthChild: 2
pattern: $SRC
- has:
nthChild: 2
kind: number_literal
regex: ^(0)$
follows:
regex: ^==$
PATTERN_2(qualified_identifier)nth2:
kind: qualified_identifier
any:
- regex: ^(folly::readFile|folly::writeFile|folly::writeFileAtomic|folly::writeFileAtomicNoThrow|folly::File)$
- regex: ^(boost::)?(filesystem::file_size|filesystem::create_directory|filesystem::create_directories|filesystem::remove|filesystem::remove_all|filesystem::rename|filesystem::copy_file|filesystem::copy|filesystem::copy_directory|filesystem::resize_file|filesystem::last_write_time|filesystem::permissions|filesystem::symlink_status|filesystem::create_symlink|filesystem::create_hard_link|filesystem::read_symlink)$
all:
- precedes:
kind: argument_list
has:
pattern: $SRC
- inside:
kind: call_expression
all:
- not:
inside:
stopBy: end
kind: condition_clause
- not:
inside:
kind: field_expression
inside:
stopBy: end
kind: compound_statement
inside:
kind: if_statement
has:
kind: condition_clause
has:
stopBy: end
any:
- kind: binary_expression
has:
stopBy: end
kind: parenthesized_expression
has:
kind: binary_expression
all:
- has:
kind: call_expression
nthChild: 1
all:
- has:
kind: identifier
regex: ^(fstatat|_fstatat)$
precedes:
kind: argument_list
all:
- has:
nthChild: 2
pattern: $SRC
- has:
kind: number_literal
regex: ^(0)$
follows:
regex: ^==$
- kind: binary_expression
all:
- has:
nthChild: 1
kind: call_expression
all:
- has:
nthChild: 1
kind: identifier
regex: ^(fstatat|_fstatat)$
- has:
nthChild: 2
kind: argument_list
all:
- has:
nthChild: 2
pattern: $SRC
- has:
nthChild: 2
kind: number_literal
regex: ^(0)$
follows:
regex: ^==$
identifier_and_qualified_identifier:
any:
- kind: identifier
regex: ^(fopen|freopen|remove|rename|access|open|stat|lstat|unlink|mkdir|rmdir|chdir)$
- kind: qualified_identifier
any:
- regex: ^(folly::readFile|folly::writeFile|folly::writeFileAtomic|folly::writeFileAtomicNoThrow|folly::File)$
- regex: ^(boost::)?(filesystem::file_size|filesystem::create_directory|filesystem::create_directories|filesystem::remove|filesystem::remove_all|filesystem::rename|filesystem::copy_file|filesystem::copy|filesystem::copy_directory|filesystem::resize_file|filesystem::last_write_time|filesystem::permissions|filesystem::symlink_status|filesystem::create_symlink|filesystem::create_hard_link|filesystem::read_symlink)$
PATTERN_3(field_expression)(identifier)nth1:
kind: field_expression
has:
nthChild: 1
stopBy: end
matches: identifier_and_qualified_identifier
all:
- precedes:
kind: argument_list
has:
pattern: $SRC
- inside:
kind: call_expression
all:
- not:
inside:
stopBy: end
kind: condition_clause
- not:
inside:
kind: field_expression
inside:
stopBy: end
kind: compound_statement
inside:
kind: if_statement
has:
kind: condition_clause
has:
stopBy: end
any:
- kind: binary_expression
has:
stopBy: end
kind: parenthesized_expression
has:
kind: binary_expression
all:
- has:
kind: call_expression
nthChild: 1
all:
- has:
kind: identifier
regex: ^(stat|_stat|lstat|_lstat)$
precedes:
kind: argument_list
all:
- has:
nthChild: 1
pattern: $SRC
- has:
kind: number_literal
regex: ^(0)$
follows:
regex: ^==$
- kind: binary_expression
all:
- has:
nthChild: 1
kind: call_expression
all:
- has:
nthChild: 1
kind: identifier
regex: ^(stat|_stat|lstat|_lstat)$
- has:
nthChild: 2
kind: argument_list
all:
- has:
nthChild: 1
pattern: $SRC
- has:
nthChild: 2
kind: number_literal
regex: ^(0)$
follows:
regex: ^==$
PATTERN_3(field_expression)(identifier)nth2:
kind: field_expression
has:
nthChild: 1
stopBy: end
matches: identifier_and_qualified_identifier
all:
- precedes:
kind: argument_list
has:
pattern: $SRC
- inside:
kind: call_expression
all:
- not:
inside:
stopBy: end
kind: condition_clause
- not:
inside:
kind: field_expression
inside:
stopBy: end
kind: compound_statement
inside:
kind: if_statement
has:
kind: condition_clause
has:
stopBy: end
any:
- kind: binary_expression
has:
stopBy: end
kind: parenthesized_expression
has:
kind: binary_expression
all:
- has:
kind: call_expression
nthChild: 1
all:
- has:
kind: identifier
regex: ^(fstatat|_fstatat)$
precedes:
kind: argument_list
all:
- has:
nthChild: 2
pattern: $SRC
- has:
kind: number_literal
regex: ^(0)$
follows:
regex: ^==$
- kind: binary_expression
all:
- has:
nthChild: 1
kind: call_expression
all:
- has:
nthChild: 1
kind: identifier
regex: ^(fstatat|_fstatat)$
- has:
nthChild: 2
kind: argument_list
all:
- has:
nthChild: 2
pattern: $SRC
- has:
nthChild: 2
kind: number_literal
regex: ^(0)$
follows:
regex: ^==$
rule:
any:
- matches: PATTERN_1(identifier)nth1
- matches: PATTERN_2(qualified_identifier)nth1
- matches: PATTERN_1(identifier)nth2
- matches: PATTERN_2(qualified_identifier)nth2
- matches: PATTERN_3(field_expression)(identifier)nth1
- matches: PATTERN_3(field_expression)(identifier)nth2