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This commit is contained in:
Adrian Cole 2011-05-01 13:10:15 -04:00
parent 0c3a0ac7ee
commit 6bf4ea34cb
1 changed files with 18 additions and 10 deletions
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28
scriptbuilder/src/main/java/org/jclouds/scriptbuilder/statements/login/ReplaceShadowPasswordEntry.java
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@ -19,18 +19,21 @@
package org.jclouds.scriptbuilder.statements.login;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Throwables.propagate;
import static java.lang.String.format;
import static org.jclouds.scriptbuilder.domain.Statements.exec;
import org.jclouds.encryption.internal.JCECrypto;
import org.jclouds.scriptbuilder.domain.OsFamily;
import org.jclouds.scriptbuilder.domain.Statement;
import org.jclouds.scriptbuilder.domain.StatementList;
import org.jclouds.scriptbuilder.domain.Statements;
import org.jclouds.scriptbuilder.util.Sha512Crypt;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableList;
/**
* Replaces the password entry for a user in the shadow file, using SHA-512
* crypt syntax.
*
* @author Adrian Cole
*/
@ -57,16 +60,21 @@ public class ReplaceShadowPasswordEntry implements Statement {
try {
String shadowPasswordEntry = Sha512Crypt.makeShadowLine(password, null, new JCECrypto());
String shadowFile = "/etc/shadow";
Statement replaceEntryInTempFile = Statements
.exec(String
.format(
"awk -v user=^%1$s: -v password='%2$s' 'BEGIN { FS=OFS=\":\" } $0 ~ user { $2 = password } 1' %3$s >%3$s.%1$s",
login, shadowPasswordEntry, shadowFile));
Statement replaceShadowFile = Statements.exec(String.format("test -f %2$s.%1$s && mv %2$s.%1$s %2$s", login,
shadowFile));
// note we are using awk variables so that the user can be defined as a
// shell variable (ex. $USER) As the block is in single quotes,
// shell interpolation wouldn't work otherwise
Statement replaceEntryInTempFile = exec(format(
"awk -v user=^%1$s: -v password='%2$s' 'BEGIN { FS=OFS=\":\" } $0 ~ user { $2 = password } 1' %3$s >%3$s.%1$s",
login, shadowPasswordEntry, shadowFile));
// would have preferred to use exec <>3 && style, but for some reason
// the sha512 line breaks in both awk and sed during an inline
// expansion. unfortunately, we have to save a temp file. In this case,
// somewhat avoiding collisions by naming the file .user, conceding it
// isn't using any locks to prevent overlapping changes
Statement replaceShadowFile = exec(format("test -f %2$s.%1$s && mv %2$s.%1$s %2$s", login, shadowFile));
return new StatementList(ImmutableList.of(replaceEntryInTempFile, replaceShadowFile)).render(family);
} catch (Exception e) {
Throwables.propagate(e);
propagate(e);
return null;
}
}