mirrors/apparmor
1
0
Fork 0
mirror of https://gitlab.com/apparmor/apparmor.git synced 2025-03-04 08:24:42 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions

parser: initial steps into encoding protocol properly

Browse source 
Before the inet patches, protocol was not handled, so the information
was ignored. This patch introduces the ability to start mediating
protocol.

Signed-off-by: Georgia Garcia <georgia.garcia@canonical.com>
This commit is contained in:
Georgia Garcia 2024-03-14 17:06:12 -03:00
parent 25f21a0758
commit 989501428e
2 changed files with 52 additions and 28 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

74
parser/network.cc
View file

@ -252,6 +252,19 @@ const char *net_find_af_name(unsigned int af)
return NULL;
}
const char *net_find_protocol_name(unsigned int protocol)
{
size_t i;
for (i = 0; i < sizeof(network_mappings) / sizeof(*network_mappings); i++) {
if (network_mappings[i].protocol == protocol) {
return network_mappings[i].protocol_name;
}
}
return NULL;
}
const struct network_tuple *net_find_mapping(const struct network_tuple *map,
const char *family,
const char *type,
@ -374,13 +387,14 @@ void network_rule::move_conditionals(struct cond_entry *conds, ip_conds &ip_cond
}
}
void network_rule::set_netperm(unsigned int family, unsigned int type)
void network_rule::set_netperm(unsigned int family, unsigned int type, unsigned int protocol)
{
if (type > SOCK_PACKET) {
/* setting mask instead of a bit */
network_perms[family] |= type;
network_perms[family].first |= type;
} else
network_perms[family] |= 1 << type;
network_perms[family].first |= 1 << type;
network_perms[family].second |= protocol;
}
network_rule::network_rule(perms_t perms_p, struct cond_entry *conds,
@ -390,7 +404,7 @@ network_rule::network_rule(perms_t perms_p, struct cond_entry *conds,
size_t family_index;
for (family_index = AF_UNSPEC; family_index < get_af_max(); family_index++) {
network_map[family_index].push_back({ family_index, 0xFFFFFFFF, 0xFFFFFFFF });
set_netperm(family_index, 0xFFFFFFFF);
set_netperm(family_index, 0xFFFFFFFF, 0xFFFFFFFF);
}
move_conditionals(conds, local);
@ -417,13 +431,13 @@ network_rule::network_rule(perms_t perms_p, const char *family, const char *type
const struct network_tuple *mapping = NULL;
while ((mapping = net_find_mapping(mapping, family, type, protocol))) {
network_map[mapping->family].push_back({ mapping->family, mapping->type, mapping->protocol });
set_netperm(mapping->family, mapping->type);
set_netperm(mapping->family, mapping->type, mapping->protocol);
}
if (type == NULL && network_map.empty()) {
while ((mapping = net_find_mapping(mapping, type, family, protocol))) {
network_map[mapping->family].push_back({ mapping->family, mapping->type, mapping->protocol });
set_netperm(mapping->family, mapping->type);
set_netperm(mapping->family, mapping->type, mapping->protocol);
}
}
@ -450,7 +464,7 @@ network_rule::network_rule(perms_t perms_p, unsigned int family, unsigned int ty
dedup_perms_rule_t(AA_CLASS_NETV8)
{
network_map[family].push_back({ family, type, 0xFFFFFFFF });
set_netperm(family, type);
set_netperm(family, type, 0xFFFFFFFF);
if (perms_p) {
perms = perms_p;
@ -479,7 +493,8 @@ ostream &network_rule::dump(ostream &os)
for (const auto& perm : network_perms) {
unsigned int family = perm.first;
unsigned int type = perm.second;
unsigned int type = perm.second.first;
unsigned int protocol = perm.second.second;
const char *family_name = net_find_af_name(family);
if (family_name)
@ -507,6 +522,12 @@ ostream &network_rule::dump(ostream &os)
os << " #" << std::hex << (type & mask);
printf(" }");
const char *protocol_name = net_find_protocol_name(protocol);
if (protocol_name)
os << " " << protocol_name;
else
os << " #" << protocol;
}
os << ",\n";
@ -559,16 +580,6 @@ std::string gen_port_cond(uint16_t port)
void network_rule::gen_ip_conds(std::ostringstream &oss, ip_conds entry, bool is_peer, bool is_cmd)
{
/* encode protocol */
if (!is_cmd) {
if (entry.is_ip) {
oss << "\\x" << std::setfill('0') << std::setw(2) << std::hex << ((entry.ip.family & 0xff00) >> 8);
oss << "\\x" << std::setfill('0') << std::setw(2) << std::hex << (entry.ip.family & 0xff);
} else {
oss << "..";
}
}
if (entry.is_port) {
/* encode port type (privileged - 1, remote - 2, unprivileged - 0) */
if (!is_peer && perms & AA_NET_BIND && entry.port < IPPORT_RESERVED)
@ -598,7 +609,7 @@ void network_rule::gen_ip_conds(std::ostringstream &oss, ip_conds entry, bool is
oss << "\\x00"; /* null transition */
}
bool network_rule::gen_net_rule(Profile &prof, u16 family, unsigned int type_mask) {
bool network_rule::gen_net_rule(Profile &prof, u16 family, unsigned int type_mask, unsigned int protocol) {
std::ostringstream buffer;
std::string buf;
@ -621,6 +632,15 @@ bool network_rule::gen_net_rule(Profile &prof, u16 family, unsigned int type_mas
return true;
}
/* encode protocol */
if (protocol > 0xffff) {
buffer << "..";
} else {
buffer << "\\x" << std::setfill('0') << std::setw(2) << std::hex << ((protocol & 0xff00) >> 8);
buffer << "\\x" << std::setfill('0') << std::setw(2) << std::hex << (protocol & 0xff);
}
if (perms & AA_PEER_NET_PERMS) {
gen_ip_conds(buffer, peer, true, false);
@ -679,17 +699,18 @@ int network_rule::gen_policy_re(Profile &prof)
for (const auto& perm : network_perms) {
unsigned int family = perm.first;
unsigned int type = perm.second;
unsigned int type = perm.second.first;
unsigned int protocol = perm.second.second;
if (type > 0xffff) {
if (!gen_net_rule(prof, family, type))
if (!gen_net_rule(prof, family, type, protocol))
goto fail;
} else {
int t;
/* generate rules for types that are set */
for (t = 0; t < 16; t++) {
if (type & (1 << t)) {
if (!gen_net_rule(prof, family, t))
if (!gen_net_rule(prof, family, t, protocol))
goto fail;
}
}
@ -760,13 +781,16 @@ void network_rule::update_compat_net(void)
}
}
static int cmp_network_map(std::unordered_map<unsigned int, perms_t> lhs,
std::unordered_map<unsigned int, perms_t> rhs)
static int cmp_network_map(std::unordered_map<unsigned int, std::pair<unsigned int, unsigned int>> lhs,
std::unordered_map<unsigned int, std::pair<unsigned int, unsigned int>> rhs)
{
int res;
size_t family_index;
for (family_index = AF_UNSPEC; family_index < get_af_max(); family_index++) {
res = lhs[family_index] - rhs[family_index];
res = lhs[family_index].first - rhs[family_index].first;
if (res)
return res;
res = lhs[family_index].second - rhs[family_index].second;
if (res)
return res;
}

6
parser/network.h
View file

@ -139,7 +139,7 @@ class network_rule: public dedup_perms_rule_t {
void move_conditionals(struct cond_entry *conds, ip_conds &ip_cond);
public:
std::unordered_map<unsigned int, std::vector<struct aa_network_entry>> network_map;
std::unordered_map<unsigned int, perms_t> network_perms;
std::unordered_map<unsigned int, std::pair<unsigned int, unsigned int>> network_perms;
ip_conds peer;
ip_conds local;
@ -179,8 +179,8 @@ public:
};
void gen_ip_conds(std::ostringstream &oss, ip_conds entry, bool is_peer, bool is_cmd);
bool gen_net_rule(Profile &prof, u16 family, unsigned int type_mask);
void set_netperm(unsigned int family, unsigned int type);
bool gen_net_rule(Profile &prof, u16 family, unsigned int type_mask, unsigned int protocol);
void set_netperm(unsigned int family, unsigned int type, unsigned int protocol);
void update_compat_net(void);
bool parse_address(ip_conds &entry);
bool parse_port(ip_conds &entry);