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eap: Use l_settings_get_string where needed

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Replace usages of l_settings_get_value with l_settings_get_string, which
will make sure the returned strings are unescaped but also allocates
memeory and forces us to use l_free on most of the strings.  Some of
these strings we explicitly set with l_settings_set_string() in our code
so when we retrieved them with l_settings_get_value() we would receive a
different string if there were any escapable characters in the string.
I didn't replace any of the l_settings_get_value() uses where we're just
checking whether a setting is present, or those which are hexstrings or
EAP method names assuming that they can't have any special characters,
although this isn't future proof.  I did use l_settings_get_string() for
file paths though.
This commit is contained in:
Andrew Zaborowski 2018-06-14 03:45:25 +02:00 committed by Denis Kenzior
parent b8fde0c166
commit 66e332fd4a
8 changed files with 70 additions and 64 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/eap-gtc.c
View File

@ -96,7 +96,7 @@ static bool eap_gtc_load_settings(struct eap_state *eap,
char *secret;
snprintf(setting, sizeof(setting), "%sGTC-Secret", prefix);
secret = l_strdup(l_settings_get_value(settings, "Security", setting));
secret = l_settings_get_string(settings, "Security", setting);
gtc = l_new(struct eap_gtc_state, 1);
gtc->secret = secret;

2
src/eap-md5.c
View File

@ -112,7 +112,7 @@ static bool eap_md5_load_settings(struct eap_state *eap,
char *secret;
snprintf(setting, sizeof(setting), "%sMD5-Secret", prefix);
secret = l_strdup(l_settings_get_value(settings, "Security", setting));
secret = l_settings_get_string(settings, "Security", setting);
md5 = l_new(struct eap_md5_state, 1);
md5->secret = secret;

34
src/eap-mschapv2.c
View File

@ -662,22 +662,26 @@ static int eap_mschapv2_check_settings(struct l_settings *settings,
const char *prefix,
struct l_queue **out_missing)
{
const char *identity, *password = NULL, *password_hash;
const char *password_hash;
L_AUTO_FREE_VAR(char *, password);
L_AUTO_FREE_VAR(char *, identity);
const struct eap_secret_info *secret;
char setting[64], setting2[64];
uint8_t hash[16];
snprintf(setting, sizeof(setting), "%sIdentity", prefix);
identity = l_settings_get_value(settings, "Security", setting);
identity = l_settings_get_string(settings, "Security", setting);
snprintf(setting2, sizeof(setting2), "%sPassword", prefix);
password = l_settings_get_value(settings, "Security", setting2);
password = l_settings_get_string(settings, "Security", setting2);
if (!identity) {
secret = l_queue_find(secrets, eap_secret_info_match, setting);
if (secret) {
identity = secret->value;
password = secret->value + strlen(secret->value) + 1;
l_free(password);
identity = l_strdup(secret->value);
password = l_strdup(secret->value +
strlen(secret->value) + 1);
goto validate;
}
@ -721,7 +725,7 @@ static int eap_mschapv2_check_settings(struct l_settings *settings,
return 0;
}
password = secret->value;
password = l_strdup(secret->value);
validate:
if (!l_utf8_validate(password, strlen(password), NULL)) {
@ -740,13 +744,14 @@ static bool eap_mschapv2_load_settings(struct eap_state *eap,
const char *prefix)
{
struct eap_mschapv2_state *state;
const char *identity, *password;
L_AUTO_FREE_VAR(char *, identity);
L_AUTO_FREE_VAR(char *, password) = NULL;
char setting[64];
state = l_new(struct eap_mschapv2_state, 1);
snprintf(setting, sizeof(setting), "%sIdentity", prefix);
identity = l_settings_get_value(settings, "Security", setting);
identity = l_settings_get_string(settings, "Security", setting);
if (!identity)
goto error;
@ -755,20 +760,21 @@ static bool eap_mschapv2_load_settings(struct eap_state *eap,
/* Either read the password-hash from hexdump or password and hash it */
snprintf(setting, sizeof(setting), "%sPassword", prefix);
password = l_settings_get_value(settings, "Security", setting);
password = l_settings_get_string(settings, "Security", setting);
if (password)
set_password_from_string(state, password);
if (!password) {
else {
unsigned char *tmp;
size_t len;
const char *hash_str;
snprintf(setting, sizeof(setting), "%sPassword-Hash", prefix);
password = l_settings_get_value(settings, "Security", setting);
if (!password)
hash_str = l_settings_get_value(settings, "Security", setting);
if (!hash_str)
goto error;
tmp = l_util_from_hexstring(password, &len);
tmp = l_util_from_hexstring(hash_str, &len);
memcpy(state->password_hash, tmp, 16);
l_free(tmp);
}

26
src/eap-peap.c
View File

@ -848,12 +848,14 @@ static int eap_peap_check_settings(struct l_settings *settings,
struct l_queue **out_missing)
{
char entry[64], client_cert_entry[64], passphrase_entry[64];
const char *path, *client_cert, *passphrase;
L_AUTO_FREE_VAR(char *, path) = NULL;
L_AUTO_FREE_VAR(char *, client_cert) = NULL;
L_AUTO_FREE_VAR(char *, passphrase) = NULL;
uint8_t *cert;
size_t size;
snprintf(entry, sizeof(entry), "%sPEAP-CACert", prefix);
path = l_settings_get_value(settings, "Security", entry);
path = l_settings_get_string(settings, "Security", entry);
if (path) {
cert = l_pem_load_certificate(path, &size);
if (!cert) {
@ -866,7 +868,7 @@ static int eap_peap_check_settings(struct l_settings *settings,
snprintf(client_cert_entry, sizeof(client_cert_entry),
"%sPEAP-ClientCert", prefix);
client_cert = l_settings_get_value(settings, "Security",
client_cert = l_settings_get_string(settings, "Security",
client_cert_entry);
if (client_cert) {
cert = l_pem_load_certificate(client_cert, &size);
@ -878,8 +880,10 @@ static int eap_peap_check_settings(struct l_settings *settings,
l_free(cert);
}
l_free(path);
snprintf(entry, sizeof(entry), "%sPEAP-ClientKey", prefix);
path = l_settings_get_value(settings, "Security", entry);
path = l_settings_get_string(settings, "Security", entry);
if (path && !client_cert) {
l_error("%s present but no client certificate (%s)",
@ -889,7 +893,7 @@ static int eap_peap_check_settings(struct l_settings *settings,
snprintf(passphrase_entry, sizeof(passphrase_entry),
"%sPEAP-ClientKeyPassphrase", prefix);
passphrase = l_settings_get_value(settings, "Security",
passphrase = l_settings_get_string(settings, "Security",
passphrase_entry);
if (!passphrase) {
@ -963,20 +967,16 @@ static bool eap_peap_load_settings(struct eap_state *eap,
peap->version = PEAP_VERSION_NOT_NEGOTIATED;
snprintf(entry, sizeof(entry), "%sPEAP-CACert", prefix);
peap->ca_cert = l_strdup(l_settings_get_value(settings, "Security",
entry));
peap->ca_cert = l_settings_get_string(settings, "Security", entry);
snprintf(entry, sizeof(entry), "%sPEAP-ClientCert", prefix);
peap->client_cert = l_strdup(l_settings_get_value(settings, "Security",
entry));
peap->client_cert = l_settings_get_string(settings, "Security", entry);
snprintf(entry, sizeof(entry), "%sPEAP-ClientKey", prefix);
peap->client_key = l_strdup(l_settings_get_value(settings, "Security",
entry));
peap->client_key = l_settings_get_string(settings, "Security", entry);
snprintf(entry, sizeof(entry), "%sPEAP-ClientKeyPassphrase", prefix);
peap->passphrase = l_strdup(l_settings_get_value(settings, "Security",
entry));
peap->passphrase = l_settings_get_string(settings, "Security", entry);
peap->phase2_eap = eap_new(eap_peap_phase2_send_response,
eap_peap_phase2_complete, eap);

11
src/eap-pwd.c
View File

@ -721,12 +721,13 @@ static int eap_pwd_check_settings(struct l_settings *settings,
const char *prefix,
struct l_queue **out_missing)
{
const char *identity, *password = NULL;
const char *password;
L_AUTO_FREE_VAR(char *, identity);
const struct eap_secret_info *secret;
char setting[64], setting2[64];
snprintf(setting, sizeof(setting), "%sIdentity", prefix);
identity = l_settings_get_value(settings, "Security", setting);
identity = l_settings_get_string(settings, "Security", setting);
snprintf(setting2, sizeof(setting2), "%sPWD-Password", prefix);
password = l_settings_get_value(settings, "Security", setting2);
@ -766,8 +767,7 @@ static bool eap_pwd_load_settings(struct eap_state *eap,
pwd->state = EAP_PWD_STATE_INIT;
snprintf(setting, sizeof(setting), "%sIdentity", prefix);
pwd->identity = l_strdup(l_settings_get_value(settings, "Security",
setting));
pwd->identity = l_settings_get_string(settings, "Security", setting);
if (!pwd->identity) {
l_error("EAP-Identity is missing");
@ -775,8 +775,7 @@ static bool eap_pwd_load_settings(struct eap_state *eap,
}
snprintf(setting, sizeof(setting), "%sPWD-Password", prefix);
pwd->password = l_strdup(l_settings_get_value(settings, "Security",
setting));
pwd->password = l_settings_get_string(settings, "Security", setting);
if (!pwd->password) {
l_error("EAP-PWD password is missing");

28
src/eap-tls.c
View File

@ -393,12 +393,14 @@ static int eap_tls_check_settings(struct l_settings *settings,
struct l_queue **out_missing)
{
char setting[64], client_cert_setting[64], passphrase_setting[64];
const char *path, *client_cert, *passphrase;
L_AUTO_FREE_VAR(char *, path) = NULL;
L_AUTO_FREE_VAR(char *, client_cert) = NULL;
L_AUTO_FREE_VAR(char *, passphrase) = NULL;
uint8_t *cert;
size_t size;
snprintf(setting, sizeof(setting), "%sTLS-CACert", prefix);
path = l_settings_get_value(settings, "Security", setting);
path = l_settings_get_string(settings, "Security", setting);
if (path) {
cert = l_pem_load_certificate(path, &size);
if (!cert) {
@ -411,7 +413,7 @@ static int eap_tls_check_settings(struct l_settings *settings,
snprintf(client_cert_setting, sizeof(client_cert_setting),
"%sTLS-ClientCert", prefix);
client_cert = l_settings_get_value(settings, "Security",
client_cert = l_settings_get_string(settings, "Security",
client_cert_setting);
if (client_cert) {
cert = l_pem_load_certificate(client_cert, &size);
@ -423,8 +425,10 @@ static int eap_tls_check_settings(struct l_settings *settings,
l_free(cert);
}
l_free(path);
snprintf(setting, sizeof(setting), "%sTLS-ClientKey", prefix);
path = l_settings_get_value(settings, "Security", setting);
path = l_settings_get_string(settings, "Security", setting);
if (path && !client_cert) {
l_error("%s present but no client certificate (%s)",
@ -434,7 +438,7 @@ static int eap_tls_check_settings(struct l_settings *settings,
snprintf(passphrase_setting, sizeof(passphrase_setting),
"%sTLS-ClientKeyPassphrase", prefix);
passphrase = l_settings_get_value(settings, "Security",
passphrase = l_settings_get_string(settings, "Security",
passphrase_setting);
if (!passphrase) {
@ -443,7 +447,7 @@ static int eap_tls_check_settings(struct l_settings *settings,
secret = l_queue_find(secrets, eap_secret_info_match,
passphrase_setting);
if (secret)
passphrase = secret->value;
passphrase = l_strdup(secret->value);
}
if (path) {
@ -504,20 +508,16 @@ static bool eap_tls_load_settings(struct eap_state *eap,
tls = l_new(struct eap_tls_state, 1);
snprintf(setting, sizeof(setting), "%sTLS-CACert", prefix);
tls->ca_cert = l_strdup(l_settings_get_value(settings,
"Security", setting));
tls->ca_cert = l_settings_get_string(settings, "Security", setting);
snprintf(setting, sizeof(setting), "%sTLS-ClientCert", prefix);
tls->client_cert = l_strdup(l_settings_get_value(settings,
"Security", setting));
tls->client_cert = l_settings_get_string(settings, "Security", setting);
snprintf(setting, sizeof(setting), "%sTLS-ClientKey", prefix);
tls->client_key = l_strdup(l_settings_get_value(settings,
"Security", setting));
tls->client_key = l_settings_get_string(settings, "Security", setting);
snprintf(setting, sizeof(setting), "%sTLS-ClientKeyPassphrase", prefix);
tls->passphrase = l_strdup(l_settings_get_value(settings,
"Security", setting));
tls->passphrase = l_settings_get_string(settings, "Security", setting);
eap_set_data(eap, tls);

27
src/eap-ttls.c
View File

@ -660,12 +660,14 @@ static int eap_ttls_check_settings(struct l_settings *settings,
struct l_queue **out_missing)
{
char setting[64], client_cert_setting[64], passphrase_setting[64];
const char *path, *client_cert, *passphrase;
L_AUTO_FREE_VAR(char *, path) = NULL;
L_AUTO_FREE_VAR(char *, client_cert) = NULL;
L_AUTO_FREE_VAR(char *, passphrase) = NULL;
uint8_t *cert;
size_t size;
snprintf(setting, sizeof(setting), "%sTTLS-CACert", prefix);
path = l_settings_get_value(settings, "Security", setting);
path = l_settings_get_string(settings, "Security", setting);
if (path) {
cert = l_pem_load_certificate(path, &size);
if (!cert) {
@ -678,7 +680,7 @@ static int eap_ttls_check_settings(struct l_settings *settings,
snprintf(client_cert_setting, sizeof(client_cert_setting),
"%sTTLS-ClientCert", prefix);
client_cert = l_settings_get_value(settings, "Security",
client_cert = l_settings_get_string(settings, "Security",
client_cert_setting);
if (client_cert) {
cert = l_pem_load_certificate(client_cert, &size);
@ -690,8 +692,10 @@ static int eap_ttls_check_settings(struct l_settings *settings,
l_free(cert);
}
l_free(path);
snprintf(setting, sizeof(setting), "%sTTLS-ClientKey", prefix);
path = l_settings_get_value(settings, "Security", setting);
path = l_settings_get_string(settings, "Security", setting);
if (path && !client_cert) {
l_error("%s present but no client certificate (%s)",
@ -701,7 +705,7 @@ static int eap_ttls_check_settings(struct l_settings *settings,
snprintf(passphrase_setting, sizeof(passphrase_setting),
"%sTTLS-ClientKeyPassphrase", prefix);
passphrase = l_settings_get_value(settings, "Security",
passphrase = l_settings_get_string(settings, "Security",
passphrase_setting);
if (!passphrase) {
@ -774,21 +778,18 @@ static bool eap_ttls_load_settings(struct eap_state *eap,
ttls = l_new(struct eap_ttls_state, 1);
snprintf(setting, sizeof(setting), "%sTTLS-CACert", prefix);
ttls->ca_cert = l_strdup(l_settings_get_value(settings,
"Security", setting));
ttls->ca_cert = l_settings_get_string(settings, "Security", setting);
snprintf(setting, sizeof(setting), "%sTTLS-ClientCert", prefix);
ttls->client_cert = l_strdup(l_settings_get_value(settings,
"Security", setting));
ttls->client_cert = l_settings_get_string(settings,
"Security", setting);
snprintf(setting, sizeof(setting), "%sTTLS-ClientKey", prefix);
ttls->client_key = l_strdup(l_settings_get_value(settings,
"Security", setting));
ttls->client_key = l_settings_get_string(settings, "Security", setting);
snprintf(setting, sizeof(setting), "%sTTLS-ClientKeyPassphrase",
prefix);
ttls->passphrase = l_strdup(l_settings_get_value(settings,
"Security", setting));
ttls->passphrase = l_settings_get_string(settings, "Security", setting);
ttls->eap = eap_new(eap_ttls_eap_tx_packet,
eap_ttls_eap_complete, eap);

4
src/eap.c
View File

@ -509,8 +509,8 @@ bool eap_load_settings(struct eap_state *eap, struct l_settings *settings,
/* get identity from settings or from EAP method */
if (!eap->method->get_identity) {
snprintf(setting, sizeof(setting), "%sIdentity", prefix);
eap->identity = l_strdup(l_settings_get_value(settings,
"Security", setting));
eap->identity = l_settings_get_string(settings,
"Security", setting);
} else {
eap->identity = l_strdup(eap->method->get_identity(eap));
}