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authorGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-11-10 18:52:35 +0000
committerGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-11-10 18:52:35 +0000
commit2211d5268cc6fc5575f758a9835070fae5ffc405 (patch)
tree46b23253b2be2c2c5bcdb6909a740e894a93ae07
parent56dceb9b7722193ef53fb1afb981f1289eecb0b0 (diff)
downloadbusybox-2211d5268cc6fc5575f758a9835070fae5ffc405.tar.gz
busybox-2211d5268cc6fc5575f758a9835070fae5ffc405.tar.bz2
libbb: add optionl support for SHA256/512 encrypted passwords
function old new delta sha_crypt - 2423 +2423 cryptpw_main 128 183 +55 to64 - 29 +29 pw_encrypt 974 1000 +26 str_rounds - 11 +11 login_main 1532 1541 +9 packed_usage 25215 25200 -15 __md5_to64 29 - -29 ------------------------------------------------------------------------------ (add/remove: 3/1 grow/shrink: 3/1 up/down: 2553/-44) Total: 2509 bytes
-rw-r--r--coreutils/Kbuild2
-rw-r--r--include/usage.h5
-rw-r--r--libbb/pw_encrypt.c43
-rw-r--r--libbb/pw_encrypt_md5.c14
-rw-r--r--libbb/pw_encrypt_sha.c251
-rw-r--r--loginutils/Config.in14
-rw-r--r--loginutils/cryptpw.c28
7 files changed, 322 insertions, 35 deletions
diff --git a/coreutils/Kbuild b/coreutils/Kbuild
index a5a2d4c26..67c56588a 100644
--- a/coreutils/Kbuild
+++ b/coreutils/Kbuild
@@ -62,6 +62,8 @@ lib-$(CONFIG_RM) += rm.o
lib-$(CONFIG_RMDIR) += rmdir.o
lib-$(CONFIG_SEQ) += seq.o
lib-$(CONFIG_SHA1SUM) += md5_sha1_sum.o
+lib-$(CONFIG_SHA256SUM) += md5_sha1_sum.o
+lib-$(CONFIG_SHA512SUM) += md5_sha1_sum.o
lib-$(CONFIG_SLEEP) += sleep.o
lib-$(CONFIG_SPLIT) += split.o
lib-$(CONFIG_SORT) += sort.o
diff --git a/include/usage.h b/include/usage.h
index 75b44a25b..71f221828 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -557,8 +557,13 @@
"\n -r Delete crontab" \
"\n FILE Replace crontab by FILE ('-': stdin)" \
+#if !ENABLE_USE_BB_CRYPT || ENABLE_USE_BB_CRYPT_SHA
+#define cryptpw_trivial_usage \
+ "[-a des|md5|sha256/512] [string]"
+#else
#define cryptpw_trivial_usage \
"[-a des|md5] [string]"
+#endif
#define cryptpw_full_usage "\n\n" \
"Output crypted string.\n" \
"If string isn't supplied on cmdline, read it from stdin.\n" \
diff --git a/libbb/pw_encrypt.c b/libbb/pw_encrypt.c
index 0b826f48d..572591ea9 100644
--- a/libbb/pw_encrypt.c
+++ b/libbb/pw_encrypt.c
@@ -15,16 +15,27 @@
* DES and MD5 crypt implementations are taken from uclibc.
* They were modified to not use static buffers.
*/
-/* Common for them */
+
+/* Used by pw_encrypt_XXX.c */
static const uint8_t ascii64[] = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+static char*
+to64(char *s, unsigned v, int n)
+{
+ while (--n >= 0) {
+ *s++ = ascii64[v & 0x3f];
+ v >>= 6;
+ }
+ return s;
+}
+
#include "pw_encrypt_des.c"
#include "pw_encrypt_md5.c"
+#if ENABLE_USE_BB_CRYPT_SHA
+#include "pw_encrypt_sha.c"
+#endif
-/* Other advanced crypt ids: */
+/* Other advanced crypt ids (TODO?): */
/* $2$ or $2a$: Blowfish */
-/* $5$: SHA-256 */
-/* $6$: SHA-512 */
-/* TODO: implement SHA - http://people.redhat.com/drepper/SHA-crypt.txt */
static struct const_des_ctx *des_cctx;
static struct des_ctx *des_ctx;
@@ -32,18 +43,20 @@ static struct des_ctx *des_ctx;
/* my_crypt returns malloc'ed data */
static char *my_crypt(const char *key, const char *salt)
{
- /* First, check if we are supposed to be using the MD5 replacement
- * instead of DES... */
- if (salt[0] == '$' && salt[1] == '1' && salt[2] == '$') {
- return md5_crypt(xzalloc(MD5_OUT_BUFSIZE), (unsigned char*)key, (unsigned char*)salt);
+ /* MD5 or SHA? */
+ if (salt[0] == '$' && salt[1] && salt[2] == '$') {
+ if (salt[1] == '1')
+ return md5_crypt(xzalloc(MD5_OUT_BUFSIZE), (unsigned char*)key, (unsigned char*)salt);
+#if ENABLE_USE_BB_CRYPT_SHA
+ if (salt[1] == '5' || salt[1] == '6')
+ return sha_crypt((char*)key, (char*)salt);
+#endif
}
- {
- if (!des_cctx)
- des_cctx = const_des_init();
- des_ctx = des_init(des_ctx, des_cctx);
- return des_crypt(des_ctx, xzalloc(DES_OUT_BUFSIZE), (unsigned char*)key, (unsigned char*)salt);
- }
+ if (!des_cctx)
+ des_cctx = const_des_init();
+ des_ctx = des_init(des_ctx, des_cctx);
+ return des_crypt(des_ctx, xzalloc(DES_OUT_BUFSIZE), (unsigned char*)key, (unsigned char*)salt);
}
/* So far nobody wants to have it public */
diff --git a/libbb/pw_encrypt_md5.c b/libbb/pw_encrypt_md5.c
index 8d0a516cf..b7478aa9d 100644
--- a/libbb/pw_encrypt_md5.c
+++ b/libbb/pw_encrypt_md5.c
@@ -494,16 +494,6 @@ static void __md5_Transform(uint32_t state[4], const unsigned char block[64])
}
-static char*
-__md5_to64(char *s, unsigned v, int n)
-{
- while (--n >= 0) {
- *s++ = ascii64[v & 0x3f];
- v >>= 6;
- }
- return s;
-}
-
/*
* UNIX password
*
@@ -605,9 +595,9 @@ md5_crypt(char passwd[MD5_OUT_BUFSIZE], const unsigned char *pw, const unsigned
final[16] = final[5];
for (i = 0; i < 5; i++) {
unsigned l = (final[i] << 16) | (final[i+6] << 8) | final[i+12];
- p = __md5_to64(p, l, 4);
+ p = to64(p, l, 4);
}
- p = __md5_to64(p, final[11], 2);
+ p = to64(p, final[11], 2);
*p = '\0';
/* Don't leave anything around in vm they could use. */
diff --git a/libbb/pw_encrypt_sha.c b/libbb/pw_encrypt_sha.c
new file mode 100644
index 000000000..9acbabb3b
--- /dev/null
+++ b/libbb/pw_encrypt_sha.c
@@ -0,0 +1,251 @@
+/* SHA256 and SHA512-based Unix crypt implementation.
+ * Released into the Public Domain by Ulrich Drepper <drepper@redhat.com>.
+ */
+
+/* Prefix for optional rounds specification. */
+static const char str_rounds[] = "rounds=%u$";
+
+/* Maximum salt string length. */
+#define SALT_LEN_MAX 16
+/* Default number of rounds if not explicitly specified. */
+#define ROUNDS_DEFAULT 5000
+/* Minimum number of rounds. */
+#define ROUNDS_MIN 1000
+/* Maximum number of rounds. */
+#define ROUNDS_MAX 999999999
+
+static char *
+NOINLINE
+sha_crypt(/*const*/ char *key_data, /*const*/ char *salt_data)
+{
+ void (*sha_begin)(void *ctx) FAST_FUNC;
+ void (*sha_hash)(const void *buffer, size_t len, void *ctx) FAST_FUNC;
+ void* (*sha_end)(void *resbuf, void *ctx) FAST_FUNC;
+ int _32or64;
+
+ char *result, *resptr;
+
+ /* btw, sha256 needs [32] and uint32_t only */
+ unsigned char alt_result[64] __attribute__((__aligned__(__alignof__(uint64_t))));
+ unsigned char temp_result[64] __attribute__((__aligned__(__alignof__(uint64_t))));
+ union {
+ sha256_ctx_t x;
+ sha512_ctx_t y;
+ } ctx;
+ union {
+ sha256_ctx_t x;
+ sha512_ctx_t y;
+ } alt_ctx;
+ unsigned salt_len;
+ unsigned key_len;
+ unsigned cnt;
+ unsigned rounds;
+ char *cp;
+ char is_sha512;
+
+ /* Analyze salt, construct already known part of result */
+ cnt = strlen(salt_data) + 1 + 43 + 1;
+ is_sha512 = salt_data[1];
+ if (is_sha512 == '6')
+ cnt += 43;
+ result = resptr = xzalloc(cnt); /* will provide NUL terminator */
+ *resptr++ = '$';
+ *resptr++ = is_sha512;
+ *resptr++ = '$';
+ rounds = ROUNDS_DEFAULT;
+ salt_data += 3;
+ if (strncmp(salt_data, str_rounds, 7) == 0) {
+ /* 7 == strlen("rounds=") */
+ char *endp;
+ unsigned srounds = bb_strtou(salt_data + 7, &endp, 10);
+ if (*endp == '$') {
+ salt_data = endp + 1;
+ rounds = srounds;
+ if (rounds < ROUNDS_MIN)
+ rounds = ROUNDS_MIN;
+ if (rounds > ROUNDS_MAX)
+ rounds = ROUNDS_MAX;
+ }
+ }
+ salt_len = strchrnul(salt_data, '$') - salt_data;
+ if (salt_len > SALT_LEN_MAX)
+ salt_len = SALT_LEN_MAX;
+ /* xstrdup assures suitable alignment; also we will use it
+ as a scratch space later. */
+ salt_data = xstrndup(salt_data, salt_len);
+ if (rounds != ROUNDS_DEFAULT) /* add "rounds=NNNNN$" */
+ resptr += sprintf(resptr, str_rounds, rounds);
+ strcpy(resptr, salt_data);
+ resptr += salt_len;
+ *resptr++ = '$';
+ /* key data doesn't need much processing */
+ key_len = strlen(key_data);
+ key_data = xstrdup(key_data);
+
+ /* Which flavor of SHAnnn ops to use? */
+ sha_begin = (void*)sha256_begin;
+ sha_hash = (void*)sha256_hash;
+ sha_end = (void*)sha256_end;
+ _32or64 = 32;
+ if (is_sha512 == '6') {
+ sha_begin = (void*)sha512_begin;
+ sha_hash = (void*)sha512_hash;
+ sha_end = (void*)sha512_end;
+ _32or64 = 64;
+ }
+
+ /* Add KEY, SALT. */
+ sha_begin(&ctx);
+ sha_hash(key_data, key_len, &ctx);
+ sha_hash(salt_data, salt_len, &ctx);
+
+ /* Compute alternate SHA sum with input KEY, SALT, and KEY.
+ The final result will be added to the first context. */
+ sha_begin(&alt_ctx);
+ sha_hash(key_data, key_len, &alt_ctx);
+ sha_hash(salt_data, salt_len, &alt_ctx);
+ sha_hash(key_data, key_len, &alt_ctx);
+ sha_end(alt_result, &alt_ctx);
+
+ /* Add result of this to the other context. */
+ /* Add for any character in the key one byte of the alternate sum. */
+ for (cnt = key_len; cnt > _32or64; cnt -= _32or64)
+ sha_hash(alt_result, _32or64, &ctx);
+ sha_hash(alt_result, cnt, &ctx);
+
+ /* Take the binary representation of the length of the key and for every
+ 1 add the alternate sum, for every 0 the key. */
+ for (cnt = key_len; cnt != 0; cnt >>= 1)
+ if ((cnt & 1) != 0)
+ sha_hash(alt_result, _32or64, &ctx);
+ else
+ sha_hash(key_data, key_len, &ctx);
+
+ /* Create intermediate result. */
+ sha_end(alt_result, &ctx);
+
+ /* Start computation of P byte sequence. */
+ /* For every character in the password add the entire password. */
+ sha_begin(&alt_ctx);
+ for (cnt = 0; cnt < key_len; ++cnt)
+ sha_hash(key_data, key_len, &alt_ctx);
+ sha_end(temp_result, &alt_ctx);
+
+ /* NB: past this point, raw key_data is not used anymore */
+
+ /* Create byte sequence P. */
+#define p_bytes key_data /* reuse the buffer as it is of the key_len size */
+ cp = p_bytes; /* was: ... = alloca(key_len); */
+ for (cnt = key_len; cnt >= _32or64; cnt -= _32or64) {
+ cp = memcpy(cp, temp_result, _32or64);
+ cp += _32or64;
+ }
+ memcpy(cp, temp_result, cnt);
+
+ /* Start computation of S byte sequence. */
+ /* For every character in the password add the entire password. */
+ sha_begin(&alt_ctx);
+ for (cnt = 0; cnt < 16 + alt_result[0]; ++cnt)
+ sha_hash(salt_data, salt_len, &alt_ctx);
+ sha_end(temp_result, &alt_ctx);
+
+ /* NB: past this point, raw salt_data is not used anymore */
+
+ /* Create byte sequence S. */
+#define s_bytes salt_data /* reuse the buffer as it is of the salt_len size */
+ cp = s_bytes; /* was: ... = alloca(salt_len); */
+ for (cnt = salt_len; cnt >= _32or64; cnt -= _32or64) {
+ cp = memcpy(cp, temp_result, _32or64);
+ cp += _32or64;
+ }
+ memcpy(cp, temp_result, cnt);
+
+ /* Repeatedly run the collected hash value through SHA to burn
+ CPU cycles. */
+ for (cnt = 0; cnt < rounds; ++cnt) {
+ sha_begin(&ctx);
+
+ /* Add key or last result. */
+ if ((cnt & 1) != 0)
+ sha_hash(p_bytes, key_len, &ctx);
+ else
+ sha_hash(alt_result, _32or64, &ctx);
+ /* Add salt for numbers not divisible by 3. */
+ if (cnt % 3 != 0)
+ sha_hash(s_bytes, salt_len, &ctx);
+ /* Add key for numbers not divisible by 7. */
+ if (cnt % 7 != 0)
+ sha_hash(p_bytes, key_len, &ctx);
+ /* Add key or last result. */
+ if ((cnt & 1) != 0)
+ sha_hash(alt_result, _32or64, &ctx);
+ else
+ sha_hash(p_bytes, key_len, &ctx);
+
+ sha_end(alt_result, &ctx);
+ }
+
+
+ /* Append encrypted password to result buffer */
+//TODO: replace with something like
+// bb_uuencode(cp, src, length, bb_uuenc_tbl_XXXbase64);
+#define b64_from_24bit(B2, B1, B0, N) \
+do { \
+ unsigned w = ((B2) << 16) | ((B1) << 8) | (B0); \
+ resptr = to64(resptr, w, N); \
+} while (0)
+ if (is_sha512 == '5') {
+ b64_from_24bit(alt_result[0], alt_result[10], alt_result[20], 4);
+ b64_from_24bit(alt_result[21], alt_result[1], alt_result[11], 4);
+ b64_from_24bit(alt_result[12], alt_result[22], alt_result[2], 4);
+ b64_from_24bit(alt_result[3], alt_result[13], alt_result[23], 4);
+ b64_from_24bit(alt_result[24], alt_result[4], alt_result[14], 4);
+ b64_from_24bit(alt_result[15], alt_result[25], alt_result[5], 4);
+ b64_from_24bit(alt_result[6], alt_result[16], alt_result[26], 4);
+ b64_from_24bit(alt_result[27], alt_result[7], alt_result[17], 4);
+ b64_from_24bit(alt_result[18], alt_result[28], alt_result[8], 4);
+ b64_from_24bit(alt_result[9], alt_result[19], alt_result[29], 4);
+ b64_from_24bit(0, alt_result[31], alt_result[30], 3);
+ } else {
+ b64_from_24bit(alt_result[0], alt_result[21], alt_result[42], 4);
+ b64_from_24bit(alt_result[22], alt_result[43], alt_result[1], 4);
+ b64_from_24bit(alt_result[44], alt_result[2], alt_result[23], 4);
+ b64_from_24bit(alt_result[3], alt_result[24], alt_result[45], 4);
+ b64_from_24bit(alt_result[25], alt_result[46], alt_result[4], 4);
+ b64_from_24bit(alt_result[47], alt_result[5], alt_result[26], 4);
+ b64_from_24bit(alt_result[6], alt_result[27], alt_result[48], 4);
+ b64_from_24bit(alt_result[28], alt_result[49], alt_result[7], 4);
+ b64_from_24bit(alt_result[50], alt_result[8], alt_result[29], 4);
+ b64_from_24bit(alt_result[9], alt_result[30], alt_result[51], 4);
+ b64_from_24bit(alt_result[31], alt_result[52], alt_result[10], 4);
+ b64_from_24bit(alt_result[53], alt_result[11], alt_result[32], 4);
+ b64_from_24bit(alt_result[12], alt_result[33], alt_result[54], 4);
+ b64_from_24bit(alt_result[34], alt_result[55], alt_result[13], 4);
+ b64_from_24bit(alt_result[56], alt_result[14], alt_result[35], 4);
+ b64_from_24bit(alt_result[15], alt_result[36], alt_result[57], 4);
+ b64_from_24bit(alt_result[37], alt_result[58], alt_result[16], 4);
+ b64_from_24bit(alt_result[59], alt_result[17], alt_result[38], 4);
+ b64_from_24bit(alt_result[18], alt_result[39], alt_result[60], 4);
+ b64_from_24bit(alt_result[40], alt_result[61], alt_result[19], 4);
+ b64_from_24bit(alt_result[62], alt_result[20], alt_result[41], 4);
+ b64_from_24bit(0, 0, alt_result[63], 2);
+ }
+ /* *resptr = '\0'; - xzalloc did it */
+#undef b64_from_24bit
+
+ /* Clear the buffer for the intermediate result so that people
+ attaching to processes or reading core dumps cannot get any
+ information. */
+ memset(temp_result, 0, sizeof(temp_result));
+ memset(alt_result, 0, sizeof(alt_result));
+ memset(&ctx, 0, sizeof(ctx));
+ memset(&alt_ctx, 0, sizeof(alt_ctx));
+ memset(key_data, 0, key_len); /* also p_bytes */
+ memset(salt_data, 0, salt_len); /* also s_bytes */
+ free(key_data);
+ free(salt_data);
+#undef p_bytes
+#undef s_bytes
+
+ return result;
+}
diff --git a/loginutils/Config.in b/loginutils/Config.in
index bb1369cdd..5f66e8685 100644
--- a/loginutils/Config.in
+++ b/loginutils/Config.in
@@ -58,7 +58,7 @@ config USE_BB_SHADOW
password servers and whatnot.
config USE_BB_CRYPT
- bool "Use internal DES and MD5 crypt functions"
+ bool "Use internal crypt functions"
default y
help
Busybox has internal DES and MD5 crypt functions.
@@ -79,6 +79,18 @@ config USE_BB_CRYPT
In static build, it makes code _smaller_ by about 1.2k,
and likely many kilobytes less of bss.
+config USE_BB_CRYPT_SHA
+ bool "Enable SHA256/512 crypt functions"
+ default n
+ depends on USE_BB_CRYPT
+ help
+ Enable this if you have passwords starting with "$5$" or "$6$"
+ in your /etc/passwd or /etc/shadow files. These passwords
+ are hashed using SHA256 and SHA512 algorithms. Support for them
+ was added to glibc in 2008.
+ With this option off, login will fail password check for any
+ user which has password encrypted with these algorithms.
+
config ADDGROUP
bool "addgroup"
default n
diff --git a/loginutils/cryptpw.c b/loginutils/cryptpw.c
index db5d95920..d76deac20 100644
--- a/loginutils/cryptpw.c
+++ b/loginutils/cryptpw.c
@@ -34,22 +34,36 @@ done
int cryptpw_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int cryptpw_main(int argc UNUSED_PARAM, char **argv)
{
- char salt[sizeof("$N$XXXXXXXX")];
+ char salt[sizeof("$N$") + 16];
char *opt_a;
+ int opts;
- if (!getopt32(argv, "a:", &opt_a) || opt_a[0] != 'd') {
+ opts = getopt32(argv, "a:", &opt_a);
+
+ if (opts && opt_a[0] == 'd') {
+ crypt_make_salt(salt, 2/2, 0); /* des */
+#if TESTING
+ strcpy(salt, "a.");
+#endif
+ } else {
salt[0] = '$';
salt[1] = '1';
salt[2] = '$';
- crypt_make_salt(salt + 3, 4, 0); /* md5 */
+#if !ENABLE_USE_BB_CRYPT || ENABLE_USE_BB_CRYPT_SHA
+ if (opts && opt_a[0] == 's') {
+ salt[1] = '5' + (strcmp(opt_a, "sha512") == 0);
+ crypt_make_salt(salt + 3, 16/2, 0); /* sha */
#if TESTING
- strcpy(salt + 3, "ajg./bcf");
+ strcpy(salt, "$6$em7yVj./Mv5n1V5X");
#endif
- } else {
- crypt_make_salt(salt, 1, 0); /* des */
+ } else
+#endif
+ {
+ crypt_make_salt(salt + 3, 8/2, 0); /* md5 */
#if TESTING
- strcpy(salt, "a.");
+ strcpy(salt + 3, "ajg./bcf");
#endif
+ }
}
puts(pw_encrypt(argv[optind] ? argv[optind] : xmalloc_fgetline(stdin), salt, 1));