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protocol-native: hex encode invalid SEC_LABEL

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When the sec label contains invalid chars, hexencode it to avoid
causing problems with invalid strings later.
This commit is contained in:
Wim Taymans 2021-03-20 20:59:50 +01:00
parent 9499e4969b
commit de12a24e77
1 changed files with 29 additions and 4 deletions
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33
src/modules/module-protocol-native.c
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@ -33,6 +33,7 @@
#include <sys/stat.h> #include <sys/stat.h>
#include <fcntl.h> #include <fcntl.h>
#include <sys/file.h> #include <sys/file.h>
#include <ctype.h>
#if HAVE_PWD_H #if HAVE_PWD_H
#include <pwd.h> #include <pwd.h>
#endif #endif
@ -390,6 +391,17 @@ static const struct pw_protocol_native_connection_events server_conn_events = {
.need_flush = on_server_need_flush, .need_flush = on_server_need_flush,
}; };
static bool check_print(const char *buffer, int len)
{
int i;
while (len > 1 && buffer[len-1] == 0)
len--;
for (i = 0; i < len; i++)
if (!isprint(buffer[i]))
return false;
return true;
}
static struct client_data *client_new(struct server *s, int fd) static struct client_data *client_new(struct server *s, int fd)
{ {
struct client_data *this; struct client_data *this;
@ -404,7 +416,7 @@ static struct client_data *client_new(struct server *s, int fd)
struct pw_properties *props; struct pw_properties *props;
char buffer[1024]; char buffer[1024];
struct protocol_data *d = pw_protocol_get_user_data(protocol); struct protocol_data *d = pw_protocol_get_user_data(protocol);
int res; int i, res;
props = pw_properties_new(PW_KEY_PROTOCOL, "protocol-native", NULL); props = pw_properties_new(PW_KEY_PROTOCOL, "protocol-native", NULL);
if (props == NULL) if (props == NULL)
@ -427,9 +439,22 @@ static struct client_data *client_new(struct server *s, int fd)
else else
pw_log_warn("server %p: security label error: %m", s); pw_log_warn("server %p: security label error: %m", s);
} else { } else {
/* buffer is not null terminated, must use length explicitly */ if (!check_print(buffer, len)) {
pw_properties_setf(props, PW_KEY_SEC_LABEL, "%.*s", char *hex, *p;
(int)len, buffer); static const char *ch = "0123456789abcdef";
p = hex = alloca(len * 2 + 10);
p += snprintf(p, 5, "hex:");
for(i = 0; i < (int)len; i++)
p += snprintf(p, 3, "%c%c",
ch[buffer[i] >> 4], ch[buffer[i] & 0xf]);
pw_properties_set(props, PW_KEY_SEC_LABEL, hex);
} else {
/* buffer is not null terminated, must use length explicitly */
pw_properties_setf(props, PW_KEY_SEC_LABEL, "%.*s",
(int)len, buffer);
}
} }
#elif defined(__FreeBSD__) #elif defined(__FreeBSD__)
len = sizeof(xucred); len = sizeof(xucred);