diff options
Diffstat (limited to 'synapse/util/stringutils.py')
| -rw-r--r-- | synapse/util/stringutils.py | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/synapse/util/stringutils.py b/synapse/util/stringutils.py index 4f25cd1d26..40cd51a8ca 100644 --- a/synapse/util/stringutils.py +++ b/synapse/util/stringutils.py @@ -13,8 +13,8 @@ # See the License for the specific language governing permissions and # limitations under the License. import itertools -import random import re +import secrets import string from collections.abc import Iterable from typing import Optional, Tuple @@ -35,18 +35,21 @@ CLIENT_SECRET_REGEX = re.compile(r"^[0-9a-zA-Z\.=_\-]+$") # MXC_REGEX = re.compile("^mxc://([^/]+)/([^/#?]+)$") -# random_string and random_string_with_symbols are used for a range of things, -# some cryptographically important, some less so. We use SystemRandom to make sure -# we get cryptographically-secure randoms. -rand = random.SystemRandom() - def random_string(length: int) -> str: - return "".join(rand.choice(string.ascii_letters) for _ in range(length)) + """Generate a cryptographically secure string of random letters. + + Drawn from the characters: `a-z` and `A-Z` + """ + return "".join(secrets.choice(string.ascii_letters) for _ in range(length)) def random_string_with_symbols(length: int) -> str: - return "".join(rand.choice(_string_with_symbols) for _ in range(length)) + """Generate a cryptographically secure string of random letters/numbers/symbols. + + Drawn from the characters: `a-z`, `A-Z`, `0-9`, and `.,;:^&*-_+=#~@` + """ + return "".join(secrets.choice(_string_with_symbols) for _ in range(length)) def is_ascii(s: bytes) -> bool: |