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From 841222c6f5b94ee4dfa53ce257cf021dc1ffeac3 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Wed, 11 Jan 2023 10:42:05 +0100
Subject: [PATCH] tree-wide: fix return value handling of base64mem()
This returns an ssize_t, not an int. On populare archs that's the
difference between 64bit and 32bit. hence, let's be more careful here,
and not silently drop half the bits on the ground by assigning the
return value to "int".
As noticed by @malikabhi05:
https://github.com/systemd/systemd/pull/24754#discussion_r1062903159
(cherry picked from commit 5e476b851251dd5addd39f06ebdf05bb3efb0be7)
Related: RHEL-16182
---
src/cryptenroll/cryptenroll-fido2.c | 9 ++++----
src/cryptenroll/cryptenroll-pkcs11.c | 9 ++++----
src/cryptenroll/cryptenroll-tpm2.c | 9 ++++----
.../cryptsetup-token-systemd-tpm2.c | 9 ++++----
.../cryptsetup-tokens/luks2-fido2.c | 9 ++++----
.../cryptsetup-tokens/luks2-pkcs11.c | 9 ++++----
src/cryptsetup/cryptsetup.c | 21 +++++++++++--------
src/home/homectl-fido2.c | 14 +++++++------
src/home/homectl-pkcs11.c | 7 ++++---
src/home/homework-fido2.c | 7 ++++---
src/home/homework-fscrypt.c | 9 ++++----
src/partition/repart.c | 9 ++++----
12 files changed, 68 insertions(+), 53 deletions(-)
diff --git a/src/cryptenroll/cryptenroll-fido2.c b/src/cryptenroll/cryptenroll-fido2.c
index 80adaefa17..87432e0d5e 100644
--- a/src/cryptenroll/cryptenroll-fido2.c
+++ b/src/cryptenroll/cryptenroll-fido2.c
@@ -21,6 +21,7 @@ int enroll_fido2(
_cleanup_free_ char *keyslot_as_string = NULL;
size_t cid_size, salt_size, secret_size;
_cleanup_free_ void *cid = NULL;
+ ssize_t base64_encoded_size;
const char *node, *un;
int r, keyslot;
@@ -53,9 +54,9 @@ int enroll_fido2(
return r;
/* Before we use the secret, we base64 encode it, for compat with homed, and to make it easier to type in manually */
- r = base64mem(secret, secret_size, &base64_encoded);
- if (r < 0)
- return log_error_errno(r, "Failed to base64 encode secret key: %m");
+ base64_encoded_size = base64mem(secret, secret_size, &base64_encoded);
+ if (base64_encoded_size < 0)
+ return log_error_errno(base64_encoded_size, "Failed to base64 encode secret key: %m");
r = cryptsetup_set_minimal_pbkdf(cd);
if (r < 0)
@@ -67,7 +68,7 @@ int enroll_fido2(
volume_key,
volume_key_size,
base64_encoded,
- strlen(base64_encoded));
+ base64_encoded_size);
if (keyslot < 0)
return log_error_errno(keyslot, "Failed to add new FIDO2 key to %s: %m", node);
diff --git a/src/cryptenroll/cryptenroll-pkcs11.c b/src/cryptenroll/cryptenroll-pkcs11.c
index 9f07a2e01d..54b6b86242 100644
--- a/src/cryptenroll/cryptenroll-pkcs11.c
+++ b/src/cryptenroll/cryptenroll-pkcs11.c
@@ -21,6 +21,7 @@ int enroll_pkcs11(
size_t decrypted_key_size, encrypted_key_size;
_cleanup_free_ void *encrypted_key = NULL;
_cleanup_(X509_freep) X509 *cert = NULL;
+ ssize_t base64_encoded_size;
const char *node;
EVP_PKEY *pkey;
int keyslot, r;
@@ -60,9 +61,9 @@ int enroll_pkcs11(
/* Let's base64 encode the key to use, for compat with homed (and it's easier to type it in by
* keyboard, if that might ever end up being necessary.) */
- r = base64mem(decrypted_key, decrypted_key_size, &base64_encoded);
- if (r < 0)
- return log_error_errno(r, "Failed to base64 encode secret key: %m");
+ base64_encoded_size = base64mem(decrypted_key, decrypted_key_size, &base64_encoded);
+ if (base64_encoded_size < 0)
+ return log_error_errno(base64_encoded_size, "Failed to base64 encode secret key: %m");
r = cryptsetup_set_minimal_pbkdf(cd);
if (r < 0)
@@ -74,7 +75,7 @@ int enroll_pkcs11(
volume_key,
volume_key_size,
base64_encoded,
- strlen(base64_encoded));
+ base64_encoded_size);
if (keyslot < 0)
return log_error_errno(keyslot, "Failed to add new PKCS#11 key to %s: %m", node);
diff --git a/src/cryptenroll/cryptenroll-tpm2.c b/src/cryptenroll/cryptenroll-tpm2.c
index 5c902908c4..96d5fc0695 100644
--- a/src/cryptenroll/cryptenroll-tpm2.c
+++ b/src/cryptenroll/cryptenroll-tpm2.c
@@ -145,6 +145,7 @@ int enroll_tpm2(struct crypt_device *cd,
uint16_t pcr_bank, primary_alg;
const char *node;
_cleanup_(erase_and_freep) char *pin_str = NULL;
+ ssize_t base64_encoded_size;
int r, keyslot;
TPM2Flags flags = 0;
@@ -230,9 +231,9 @@ int enroll_tpm2(struct crypt_device *cd,
}
/* let's base64 encode the key to use, for compat with homed (and it's easier to every type it in by keyboard, if that might end up being necessary. */
- r = base64mem(secret, secret_size, &base64_encoded);
- if (r < 0)
- return log_error_errno(r, "Failed to base64 encode secret key: %m");
+ base64_encoded_size = base64mem(secret, secret_size, &base64_encoded);
+ if (base64_encoded_size < 0)
+ return log_error_errno(base64_encoded_size, "Failed to base64 encode secret key: %m");
r = cryptsetup_set_minimal_pbkdf(cd);
if (r < 0)
@@ -244,7 +245,7 @@ int enroll_tpm2(struct crypt_device *cd,
volume_key,
volume_key_size,
base64_encoded,
- strlen(base64_encoded));
+ base64_encoded_size);
if (keyslot < 0)
return log_error_errno(keyslot, "Failed to add new TPM2 key to %s: %m", node);
diff --git a/src/cryptsetup/cryptsetup-tokens/cryptsetup-token-systemd-tpm2.c b/src/cryptsetup/cryptsetup-tokens/cryptsetup-token-systemd-tpm2.c
index abe80720af..1eb924529c 100644
--- a/src/cryptsetup/cryptsetup-tokens/cryptsetup-token-systemd-tpm2.c
+++ b/src/cryptsetup/cryptsetup-tokens/cryptsetup-token-systemd-tpm2.c
@@ -51,6 +51,7 @@ _public_ int cryptsetup_token_open_pin(
.search_pcr_mask = UINT32_MAX
};
uint16_t pcr_bank, primary_alg;
+ ssize_t base64_encoded_size;
TPM2Flags flags = 0;
const char *json;
int r;
@@ -116,13 +117,13 @@ _public_ int cryptsetup_token_open_pin(
return log_debug_open_error(cd, r);
/* Before using this key as passphrase we base64 encode it, for compat with homed */
- r = base64mem(decrypted_key, decrypted_key_size, &base64_encoded);
- if (r < 0)
- return log_debug_open_error(cd, r);
+ base64_encoded_size = base64mem(decrypted_key, decrypted_key_size, &base64_encoded);
+ if (base64_encoded_size < 0)
+ return log_debug_open_error(cd, base64_encoded_size);
/* free'd automatically by libcryptsetup */
- *ret_password_len = strlen(base64_encoded);
*ret_password = TAKE_PTR(base64_encoded);
+ *ret_password_len = base64_encoded_size;
return 0;
}
diff --git a/src/cryptsetup/cryptsetup-tokens/luks2-fido2.c b/src/cryptsetup/cryptsetup-tokens/luks2-fido2.c
index a0e1ccbeeb..a1c85e600c 100644
--- a/src/cryptsetup/cryptsetup-tokens/luks2-fido2.c
+++ b/src/cryptsetup/cryptsetup-tokens/luks2-fido2.c
@@ -25,6 +25,7 @@ int acquire_luks2_key(
_cleanup_(erase_and_freep) void *decrypted_key = NULL;
_cleanup_(erase_and_freep) char *base64_encoded = NULL;
_cleanup_strv_free_erase_ char **pins = NULL;
+ ssize_t base64_encoded_size;
assert(ret_keyslot_passphrase);
assert(ret_keyslot_passphrase_size);
@@ -58,12 +59,12 @@ int acquire_luks2_key(
return r;
/* Before using this key as passphrase we base64 encode it, for compat with homed */
- r = base64mem(decrypted_key, decrypted_key_size, &base64_encoded);
- if (r < 0)
- return crypt_log_error_errno(cd, r, "Failed to base64 encode key: %m");
+ base64_encoded_size = base64mem(decrypted_key, decrypted_key_size, &base64_encoded);
+ if (base64_encoded_size < 0)
+ return crypt_log_error_errno(cd, (int) base64_encoded_size, "Failed to base64 encode key: %m");
*ret_keyslot_passphrase = TAKE_PTR(base64_encoded);
- *ret_keyslot_passphrase_size = strlen(*ret_keyslot_passphrase);
+ *ret_keyslot_passphrase_size = base64_encoded_size;
return 0;
}
diff --git a/src/cryptsetup/cryptsetup-tokens/luks2-pkcs11.c b/src/cryptsetup/cryptsetup-tokens/luks2-pkcs11.c
index 2e0450aa5b..1ed9e2bb86 100644
--- a/src/cryptsetup/cryptsetup-tokens/luks2-pkcs11.c
+++ b/src/cryptsetup/cryptsetup-tokens/luks2-pkcs11.c
@@ -187,6 +187,7 @@ int acquire_luks2_key(
_cleanup_free_ char *pkcs11_uri = NULL;
_cleanup_free_ void *encrypted_key = NULL;
systemd_pkcs11_plugin_params *pkcs11_params = userdata;
+ ssize_t base64_encoded_size;
assert(json);
assert(ret_password);
@@ -213,12 +214,12 @@ int acquire_luks2_key(
if (r < 0)
return r;
- r = base64mem(decrypted_key, decrypted_key_size, &base64_encoded);
- if (r < 0)
- return crypt_log_error_errno(cd, r, "Can not base64 encode key: %m");
+ base64_encoded_size = base64mem(decrypted_key, decrypted_key_size, &base64_encoded);
+ if (base64_encoded_size < 0)
+ return crypt_log_error_errno(cd, (int) base64_encoded_size, "Can not base64 encode key: %m");
*ret_password = TAKE_PTR(base64_encoded);
- *ret_password_size = strlen(*ret_password);
+ *ret_password_size = base64_encoded_size;
return 0;
}
diff --git a/src/cryptsetup/cryptsetup.c b/src/cryptsetup/cryptsetup.c
index 7aa36b4b03..a25fb28948 100644
--- a/src/cryptsetup/cryptsetup.c
+++ b/src/cryptsetup/cryptsetup.c
@@ -1176,14 +1176,15 @@ static int attach_luks_or_plain_or_bitlk_by_fido2(
r = crypt_activate_by_volume_key(cd, name, decrypted_key, decrypted_key_size, flags);
else {
_cleanup_(erase_and_freep) char *base64_encoded = NULL;
+ ssize_t base64_encoded_size;
/* Before using this key as passphrase we base64 encode it, for compat with homed */
- r = base64mem(decrypted_key, decrypted_key_size, &base64_encoded);
- if (r < 0)
+ base64_encoded_size = base64mem(decrypted_key, decrypted_key_size, &base64_encoded);
+ if (base64_encoded_size < 0)
return log_oom();
- r = crypt_activate_by_passphrase(cd, name, keyslot, base64_encoded, strlen(base64_encoded), flags);
+ r = crypt_activate_by_passphrase(cd, name, keyslot, base64_encoded, base64_encoded_size, flags);
}
if (r == -EPERM) {
log_error_errno(r, "Failed to activate with FIDO2 decrypted key. (Key incorrect?)");
@@ -1323,6 +1324,7 @@ static int attach_luks_or_plain_or_bitlk_by_pkcs11(
r = crypt_activate_by_volume_key(cd, name, decrypted_key, decrypted_key_size, flags);
else {
_cleanup_(erase_and_freep) char *base64_encoded = NULL;
+ ssize_t base64_encoded_size;
/* Before using this key as passphrase we base64 encode it. Why? For compatibility
* with homed's PKCS#11 hookup: there we want to use the key we acquired through
@@ -1332,11 +1334,11 @@ static int attach_luks_or_plain_or_bitlk_by_pkcs11(
* without embedded NUL here too, and that's easiest to generate from a binary blob
* via base64 encoding. */
- r = base64mem(decrypted_key, decrypted_key_size, &base64_encoded);
- if (r < 0)
+ base64_encoded_size = base64mem(decrypted_key, decrypted_key_size, &base64_encoded);
+ if (base64_encoded_size < 0)
return log_oom();
- r = crypt_activate_by_passphrase(cd, name, keyslot, base64_encoded, strlen(base64_encoded), flags);
+ r = crypt_activate_by_passphrase(cd, name, keyslot, base64_encoded, base64_encoded_size, flags);
}
if (r == -EPERM) {
log_error_errno(r, "Failed to activate with PKCS#11 decrypted key. (Key incorrect?)");
@@ -1611,14 +1613,15 @@ static int attach_luks_or_plain_or_bitlk_by_tpm2(
r = crypt_activate_by_volume_key(cd, name, decrypted_key, decrypted_key_size, flags);
else {
_cleanup_(erase_and_freep) char *base64_encoded = NULL;
+ ssize_t base64_encoded_size;
/* Before using this key as passphrase we base64 encode it, for compat with homed */
- r = base64mem(decrypted_key, decrypted_key_size, &base64_encoded);
- if (r < 0)
+ base64_encoded_size = base64mem(decrypted_key, decrypted_key_size, &base64_encoded);
+ if (base64_encoded_size < 0)
return log_oom();
- r = crypt_activate_by_passphrase(cd, name, keyslot, base64_encoded, strlen(base64_encoded), flags);
+ r = crypt_activate_by_passphrase(cd, name, keyslot, base64_encoded, base64_encoded_size, flags);
}
if (r == -EPERM) {
log_error_errno(r, "Failed to activate with TPM2 decrypted key. (Key incorrect?)");
diff --git a/src/home/homectl-fido2.c b/src/home/homectl-fido2.c
index 61f0d081a3..3cbdf912aa 100644
--- a/src/home/homectl-fido2.c
+++ b/src/home/homectl-fido2.c
@@ -26,14 +26,15 @@ static int add_fido2_credential_id(
_cleanup_(json_variant_unrefp) JsonVariant *w = NULL;
_cleanup_strv_free_ char **l = NULL;
_cleanup_free_ char *escaped = NULL;
+ ssize_t escaped_size;
int r;
assert(v);
assert(cid);
- r = base64mem(cid, cid_size, &escaped);
- if (r < 0)
- return log_error_errno(r, "Failed to base64 encode FIDO2 credential ID: %m");
+ escaped_size = base64mem(cid, cid_size, &escaped);
+ if (escaped_size < 0)
+ return log_error_errno(escaped_size, "Failed to base64 encode FIDO2 credential ID: %m");
w = json_variant_ref(json_variant_by_key(*v, "fido2HmacCredential"));
if (w) {
@@ -73,13 +74,14 @@ static int add_fido2_salt(
_cleanup_(json_variant_unrefp) JsonVariant *l = NULL, *w = NULL, *e = NULL;
_cleanup_(erase_and_freep) char *base64_encoded = NULL, *hashed = NULL;
+ ssize_t base64_encoded_size;
int r;
/* Before using UNIX hashing on the supplied key we base64 encode it, since crypt_r() and friends
* expect a NUL terminated string, and we use a binary key */
- r = base64mem(secret, secret_size, &base64_encoded);
- if (r < 0)
- return log_error_errno(r, "Failed to base64 encode secret key: %m");
+ base64_encoded_size = base64mem(secret, secret_size, &base64_encoded);
+ if (base64_encoded_size < 0)
+ return log_error_errno(base64_encoded_size, "Failed to base64 encode secret key: %m");
r = hash_password(base64_encoded, &hashed);
if (r < 0)
diff --git a/src/home/homectl-pkcs11.c b/src/home/homectl-pkcs11.c
index 69c9d97aca..dc6ecf1665 100644
--- a/src/home/homectl-pkcs11.c
+++ b/src/home/homectl-pkcs11.c
@@ -19,6 +19,7 @@ static int add_pkcs11_encrypted_key(
_cleanup_(json_variant_unrefp) JsonVariant *l = NULL, *w = NULL, *e = NULL;
_cleanup_(erase_and_freep) char *base64_encoded = NULL, *hashed = NULL;
+ ssize_t base64_encoded_size;
int r;
assert(v);
@@ -30,9 +31,9 @@ static int add_pkcs11_encrypted_key(
/* Before using UNIX hashing on the supplied key we base64 encode it, since crypt_r() and friends
* expect a NUL terminated string, and we use a binary key */
- r = base64mem(decrypted_key, decrypted_key_size, &base64_encoded);
- if (r < 0)
- return log_error_errno(r, "Failed to base64 encode secret key: %m");
+ base64_encoded_size = base64mem(decrypted_key, decrypted_key_size, &base64_encoded);
+ if (base64_encoded_size < 0)
+ return log_error_errno(base64_encoded_size, "Failed to base64 encode secret key: %m");
r = hash_password(base64_encoded, &hashed);
if (r < 0)
diff --git a/src/home/homework-fido2.c b/src/home/homework-fido2.c
index 23fda4a355..5c7cd52e1b 100644
--- a/src/home/homework-fido2.c
+++ b/src/home/homework-fido2.c
@@ -17,6 +17,7 @@ int fido2_use_token(
_cleanup_(erase_and_freep) void *hmac = NULL;
size_t hmac_size;
Fido2EnrollFlags flags = 0;
+ ssize_t ss;
int r;
assert(h);
@@ -65,9 +66,9 @@ int fido2_use_token(
if (r < 0)
return r;
- r = base64mem(hmac, hmac_size, ret);
- if (r < 0)
- return log_error_errno(r, "Failed to base64 encode HMAC secret: %m");
+ ss = base64mem(hmac, hmac_size, ret);
+ if (ss < 0)
+ return log_error_errno(ss, "Failed to base64 encode HMAC secret: %m");
return 0;
}
diff --git a/src/home/homework-fscrypt.c b/src/home/homework-fscrypt.c
index 5106961f38..bd32393d93 100644
--- a/src/home/homework-fscrypt.c
+++ b/src/home/homework-fscrypt.c
@@ -408,6 +408,7 @@ static int fscrypt_slot_set(
_cleanup_free_ void *encrypted = NULL;
const EVP_CIPHER *cc;
size_t encrypted_size;
+ ssize_t ss;
r = crypto_random_bytes(salt, sizeof(salt));
if (r < 0)
@@ -458,12 +459,12 @@ static int fscrypt_slot_set(
assert((size_t) encrypted_size_out1 + (size_t) encrypted_size_out2 < encrypted_size);
encrypted_size = (size_t) encrypted_size_out1 + (size_t) encrypted_size_out2;
- r = base64mem(salt, sizeof(salt), &salt_base64);
- if (r < 0)
+ ss = base64mem(salt, sizeof(salt), &salt_base64);
+ if (ss < 0)
return log_oom();
- r = base64mem(encrypted, encrypted_size, &encrypted_base64);
- if (r < 0)
+ ss = base64mem(encrypted, encrypted_size, &encrypted_base64);
+ if (ss < 0)
return log_oom();
joined = strjoin(salt_base64, ":", encrypted_base64);
diff --git a/src/partition/repart.c b/src/partition/repart.c
index c4ca9840c8..8875e09389 100644
--- a/src/partition/repart.c
+++ b/src/partition/repart.c
@@ -3022,6 +3022,7 @@ static int partition_encrypt(
_cleanup_free_ void *pubkey = NULL;
_cleanup_free_ void *blob = NULL, *hash = NULL;
size_t secret_size, blob_size, hash_size, pubkey_size = 0;
+ ssize_t base64_encoded_size;
uint16_t pcr_bank, primary_alg;
int keyslot;
@@ -3049,9 +3050,9 @@ static int partition_encrypt(
if (r < 0)
return log_error_errno(r, "Failed to seal to TPM2: %m");
- r = base64mem(secret, secret_size, &base64_encoded);
- if (r < 0)
- return log_error_errno(r, "Failed to base64 encode secret key: %m");
+ base64_encoded_size = base64mem(secret, secret_size, &base64_encoded);
+ if (base64_encoded_size < 0)
+ return log_error_errno(base64_encoded_size, "Failed to base64 encode secret key: %m");
r = cryptsetup_set_minimal_pbkdf(cd);
if (r < 0)
@@ -3063,7 +3064,7 @@ static int partition_encrypt(
volume_key,
volume_key_size,
base64_encoded,
- strlen(base64_encoded));
+ base64_encoded_size);
if (keyslot < 0)
return log_error_errno(keyslot, "Failed to add new TPM2 key to %s: %m", node);
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