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parse-helpers: allow port 0 for socket bind items

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This patch adds a new parameter to parse_ip_port_range, giving callers
the option to allow ranges to have their min be 0 instead of 1.

This is then used by parse_ip_ports_token, intern used by
parse_socket_bind_item to allow port 0 when restricting bind system
calls with SocketBindDeny / SocketBindAllow.

With this, users running server software written using the golang
standard library will be able to effectively sandbox their software,
albeit with a small loss in security protections by allowing the
process to bind on a random port in the
/proc/sys/net/ipv4/ip_local_port_range.
This commit is contained in:
networkException
2024-01-06 08:27:14 +09:00
committed by Yu Watanabe
parent 9807ee19b0
commit dcfac3a3f9
6 changed files with 15 additions and 8 deletions
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src/basic/parse-util.h
+1 -1
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@@ -139,7 +139,7 @@ int parse_fractional_part_u(const char **s, size_t digits, unsigned *res);
int parse_nice(const char *p, int *ret);
int parse_ip_port(const char *s, uint16_t *ret);
int parse_ip_port_range(const char *s, uint16_t *low, uint16_t *high);
int parse_ip_port_range(const char *s, uint16_t *low, uint16_t *high, bool allow_zero);
int parse_ip_prefix_length(const char *s, int *ret);