| 1 | /** |
| 2 | * |
| 3 | * Copyright (C) 2011 Cloud Conscious, LLC. <info@cloudconscious.com> |
| 4 | * |
| 5 | * ==================================================================== |
| 6 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 7 | * you may not use this file except in compliance with the License. |
| 8 | * You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, software |
| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 15 | * See the License for the specific language governing permissions and |
| 16 | * limitations under the License. |
| 17 | * ==================================================================== |
| 18 | */ |
| 19 | package org.jclouds.scriptbuilder.statements.login; |
| 20 | |
| 21 | import static com.google.common.base.Preconditions.checkNotNull; |
| 22 | import static com.google.common.base.Throwables.propagate; |
| 23 | import static java.lang.String.format; |
| 24 | import static org.jclouds.scriptbuilder.domain.Statements.exec; |
| 25 | |
| 26 | import javax.inject.Named; |
| 27 | |
| 28 | import org.jclouds.crypto.Sha512Crypt; |
| 29 | import org.jclouds.scriptbuilder.domain.OsFamily; |
| 30 | import org.jclouds.scriptbuilder.domain.Statement; |
| 31 | import org.jclouds.scriptbuilder.domain.StatementList; |
| 32 | |
| 33 | import com.google.common.annotations.VisibleForTesting; |
| 34 | import com.google.common.base.Function; |
| 35 | import com.google.common.collect.ImmutableList; |
| 36 | import com.google.inject.Inject; |
| 37 | |
| 38 | /** |
| 39 | * Replaces the password entry for a user in the shadow file, using SHA-512 |
| 40 | * crypt syntax. |
| 41 | * |
| 42 | * @author Adrian Cole |
| 43 | */ |
| 44 | public class ReplaceShadowPasswordEntry implements Statement { |
| 45 | |
| 46 | private final String login; |
| 47 | private final String password; |
| 48 | |
| 49 | private Function<String, String> cryptFunction = Sha512Crypt.function(); |
| 50 | |
| 51 | @Inject(optional = true) |
| 52 | @Named("CRYPT") |
| 53 | @VisibleForTesting |
| 54 | ReplaceShadowPasswordEntry cryptFunction(Function<String, String> cryptFunction) { |
| 55 | this.cryptFunction = cryptFunction; |
| 56 | return this; |
| 57 | } |
| 58 | |
| 59 | public ReplaceShadowPasswordEntry(String login, String password) { |
| 60 | this.login = checkNotNull(login, "login"); |
| 61 | this.password = checkNotNull(password, "password"); |
| 62 | } |
| 63 | |
| 64 | @Override |
| 65 | public Iterable<String> functionDependencies(OsFamily family) { |
| 66 | return ImmutableList.of(); |
| 67 | } |
| 68 | |
| 69 | @Override |
| 70 | public String render(OsFamily family) { |
| 71 | checkNotNull(family, "family"); |
| 72 | if (family == OsFamily.WINDOWS) |
| 73 | throw new UnsupportedOperationException("windows not yet implemented"); |
| 74 | try { |
| 75 | String shadowPasswordEntry = cryptFunction.apply(password); |
| 76 | String shadowFile = "/etc/shadow"; |
| 77 | // note we are using awk variables so that the user can be defined as a |
| 78 | // shell variable (ex. $USER) As the block is in single quotes, |
| 79 | // shell interpolation wouldn't work otherwise |
| 80 | Statement replaceEntryInTempFile = exec(format( |
| 81 | "awk -v user=^%1$s: -v password='%2$s' 'BEGIN { FS=OFS=\":\" } $0 ~ user { $2 = password } 1' %3$s >%3$s.%1$s", |
| 82 | login, shadowPasswordEntry, shadowFile)); |
| 83 | // would have preferred to use exec <>3 && style, but for some reason |
| 84 | // the sha512 line breaks in both awk and sed during an inline |
| 85 | // expansion. unfortunately, we have to save a temp file. In this case, |
| 86 | // somewhat avoiding collisions by naming the file .user, conceding it |
| 87 | // isn't using any locks to prevent overlapping changes |
| 88 | Statement replaceShadowFile = exec(format("test -f %2$s.%1$s && mv %2$s.%1$s %2$s", login, shadowFile)); |
| 89 | return new StatementList(ImmutableList.of(replaceEntryInTempFile, replaceShadowFile)).render(family); |
| 90 | } catch (Exception e) { |
| 91 | propagate(e); |
| 92 | return null; |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | @Override |
| 97 | public int hashCode() { |
| 98 | final int prime = 31; |
| 99 | int result = 1; |
| 100 | result = prime * result + ((login == null) ? 0 : login.hashCode()); |
| 101 | return result; |
| 102 | } |
| 103 | |
| 104 | @Override |
| 105 | public boolean equals(Object obj) { |
| 106 | if (this == obj) |
| 107 | return true; |
| 108 | if (obj == null) |
| 109 | return false; |
| 110 | if (getClass() != obj.getClass()) |
| 111 | return false; |
| 112 | ReplaceShadowPasswordEntry other = (ReplaceShadowPasswordEntry) obj; |
| 113 | if (login == null) { |
| 114 | if (other.login != null) |
| 115 | return false; |
| 116 | } else if (!login.equals(other.login)) |
| 117 | return false; |
| 118 | return true; |
| 119 | } |
| 120 | } |