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diff -up yp-tools-2.12/man/yppasswd.1.in.hash yp-tools-2.12/man/yppasswd.1.in
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--- yp-tools-2.12/man/yppasswd.1.in.hash 2011-09-09 16:18:49.469037058 +0200
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+++ yp-tools-2.12/man/yppasswd.1.in 2011-09-09 16:20:19.101030930 +0200
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@@ -81,6 +81,12 @@ for authentication with the
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.BR yppasswdd (8)
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daemon. Subsequently, the
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program prompts for the updated information:
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+.P
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+If we use shadowing passwords using passwd.adjunct, SHA-512 will be
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+used for hashing a new password by default. If we want to use MD5,
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+SHA_256 or older DES, we need to set the environment variable
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+YP_PASSWD_HASH. Possible values are "DES", "MD5", "SHA-256" and
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+"SHA-512" (value is case-insensitive).
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.\"
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.\"
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.IP "\fByppasswd\fP or \fB-p\fP"
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diff -up yp-tools-2.12/src/yppasswd.c.hash yp-tools-2.12/src/yppasswd.c
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--- yp-tools-2.12/src/yppasswd.c.hash 2011-09-09 16:20:35.360029823 +0200
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+++ yp-tools-2.12/src/yppasswd.c 2011-09-09 16:25:21.589010245 +0200
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@@ -514,6 +514,32 @@ create_random_salt (char *salt, int num_
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close (fd);
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}
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+
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+/*
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+ * Reads environment variable YP_PASSWD_HASH and returns hash id.
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+ * Possible values are MD5, SHA-256, SHA-512 and DES.
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+ * If other value is set or it is not set at all, SHA-512 is used.
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+ */
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+static int
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+get_env_hash_id()
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+{
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+ const char *v = getenv("YP_PASSWD_HASH");
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+ if (!v)
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+ return SHA_512;
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+
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+ if (!strcasecmp(v, "DES"))
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+ return DES;
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+
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+ if (!strcasecmp(v, "SHA-256"))
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+ return SHA_256;
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+
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+ if (!strcasecmp(v, "MD5"))
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+ return MD5;
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+
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+ return SHA_512;
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+}
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+
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+
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int
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main (int argc, char **argv)
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{
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@@ -723,6 +749,15 @@ main (int argc, char **argv)
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hash_id = get_hash_id (pwd->pw_passwd);
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+ /* If we use passwd.adjunct, there is no magic value like $1$ in the
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+ * beginning of password, but ##username instead. Thus, SHA_512 will be
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+ * used for hashing a new password by default. If we want to use DES,
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+ * MD5 or SHA_256, we need to set the environment variable
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+ * YP_PASSWD_HASH (e.g. YP_PASSWD_HASH=DES).
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+ */
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+ if (strncmp(pwd->pw_passwd, "##", 2) == 0)
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+ hash_id = get_env_hash_id();
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+
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/* Preserve 'rounds=<N>$' (if present) in case of SHA-2 */
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if (hash_id == SHA_256 || hash_id == SHA_512)
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{
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