root / lib / ssh.py @ 42d49574
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2 | a8083063 | Iustin Pop | #
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3 | a8083063 | Iustin Pop | |
4 | ebcd61bb | Iustin Pop | # Copyright (C) 2006, 2007, 2010, 2011 Google Inc.
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5 | a8083063 | Iustin Pop | #
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6 | a8083063 | Iustin Pop | # This program is free software; you can redistribute it and/or modify
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7 | a8083063 | Iustin Pop | # it under the terms of the GNU General Public License as published by
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8 | a8083063 | Iustin Pop | # the Free Software Foundation; either version 2 of the License, or
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9 | a8083063 | Iustin Pop | # (at your option) any later version.
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10 | a8083063 | Iustin Pop | #
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11 | a8083063 | Iustin Pop | # This program is distributed in the hope that it will be useful, but
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12 | a8083063 | Iustin Pop | # WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | a8083063 | Iustin Pop | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | a8083063 | Iustin Pop | # General Public License for more details.
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15 | a8083063 | Iustin Pop | #
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16 | a8083063 | Iustin Pop | # You should have received a copy of the GNU General Public License
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17 | a8083063 | Iustin Pop | # along with this program; if not, write to the Free Software
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18 | a8083063 | Iustin Pop | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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19 | a8083063 | Iustin Pop | # 02110-1301, USA.
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20 | a8083063 | Iustin Pop | |
21 | a8083063 | Iustin Pop | |
22 | a8083063 | Iustin Pop | """Module encapsulating ssh functionality.
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23 | a8083063 | Iustin Pop |
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24 | a8083063 | Iustin Pop | """
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25 | a8083063 | Iustin Pop | |
26 | a8083063 | Iustin Pop | |
27 | a8083063 | Iustin Pop | import os |
28 | 9c034cbe | Iustin Pop | import logging |
29 | 33993ab8 | René Nussbaumer | import re |
30 | a8083063 | Iustin Pop | |
31 | a8083063 | Iustin Pop | from ganeti import utils |
32 | a8083063 | Iustin Pop | from ganeti import errors |
33 | 82122173 | Iustin Pop | from ganeti import constants |
34 | 8062638d | Manuel Franceschini | from ganeti import netutils |
35 | 8fd1bfa9 | Michael Hanselmann | from ganeti import pathutils |
36 | cffbbae7 | Michael Hanselmann | from ganeti import vcluster |
37 | 82122173 | Iustin Pop | |
38 | 82122173 | Iustin Pop | |
39 | 33993ab8 | René Nussbaumer | def FormatParamikoFingerprint(fingerprint): |
40 | 697a3d61 | Manuel Franceschini | """Format paramiko PKey fingerprint.
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41 | 33993ab8 | René Nussbaumer |
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42 | 33993ab8 | René Nussbaumer | @type fingerprint: str
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43 | 33993ab8 | René Nussbaumer | @param fingerprint: PKey fingerprint
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44 | 697a3d61 | Manuel Franceschini | @return: The string hex representation of the fingerprint
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45 | 33993ab8 | René Nussbaumer |
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46 | 33993ab8 | René Nussbaumer | """
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47 | 33993ab8 | René Nussbaumer | assert len(fingerprint) % 2 == 0 |
48 | 33993ab8 | René Nussbaumer | return ":".join(re.findall(r"..", fingerprint.lower())) |
49 | 33993ab8 | René Nussbaumer | |
50 | 33993ab8 | René Nussbaumer | |
51 | 8a3c9e8a | Michael Hanselmann | def GetUserFiles(user, mkdir=False, kind=constants.SSHK_DSA, |
52 | d12b9f66 | Michael Hanselmann | _homedir_fn=None):
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53 | 8a3c9e8a | Michael Hanselmann | """Return the paths of a user's SSH files.
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54 | 8a3c9e8a | Michael Hanselmann |
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55 | 8a3c9e8a | Michael Hanselmann | @type user: string
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56 | 8a3c9e8a | Michael Hanselmann | @param user: Username
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57 | 8a3c9e8a | Michael Hanselmann | @type mkdir: bool
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58 | 8a3c9e8a | Michael Hanselmann | @param mkdir: Whether to create ".ssh" directory if it doesn't exist
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59 | 8a3c9e8a | Michael Hanselmann | @type kind: string
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60 | 8a3c9e8a | Michael Hanselmann | @param kind: One of L{constants.SSHK_ALL}
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61 | 8a3c9e8a | Michael Hanselmann | @rtype: tuple; (string, string, string)
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62 | 8a3c9e8a | Michael Hanselmann | @return: Tuple containing three file system paths; the private SSH key file,
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63 | 8a3c9e8a | Michael Hanselmann | the public SSH key file and the user's C{authorized_keys} file
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64 | 8a3c9e8a | Michael Hanselmann | @raise errors.OpExecError: When home directory of the user can not be
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65 | 8a3c9e8a | Michael Hanselmann | determined
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66 | 8a3c9e8a | Michael Hanselmann | @raise errors.OpExecError: Regardless of the C{mkdir} parameters, this
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67 | 8a3c9e8a | Michael Hanselmann | exception is raised if C{~$user/.ssh} is not a directory
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68 | 70d9e3d8 | Iustin Pop |
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69 | 70d9e3d8 | Iustin Pop | """
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70 | d12b9f66 | Michael Hanselmann | if _homedir_fn is None: |
71 | d12b9f66 | Michael Hanselmann | _homedir_fn = utils.GetHomeDir |
72 | d12b9f66 | Michael Hanselmann | |
73 | 8a3c9e8a | Michael Hanselmann | user_dir = _homedir_fn(user) |
74 | 70d9e3d8 | Iustin Pop | if not user_dir: |
75 | 8a3c9e8a | Michael Hanselmann | raise errors.OpExecError("Cannot resolve home of user '%s'" % user) |
76 | 8a3c9e8a | Michael Hanselmann | |
77 | 8a3c9e8a | Michael Hanselmann | if kind == constants.SSHK_DSA:
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78 | 8a3c9e8a | Michael Hanselmann | suffix = "dsa"
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79 | 8a3c9e8a | Michael Hanselmann | elif kind == constants.SSHK_RSA:
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80 | 8a3c9e8a | Michael Hanselmann | suffix = "rsa"
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81 | 8a3c9e8a | Michael Hanselmann | else:
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82 | 8a3c9e8a | Michael Hanselmann | raise errors.ProgrammerError("Unknown SSH key kind '%s'" % kind) |
83 | 70d9e3d8 | Iustin Pop | |
84 | c4feafe8 | Iustin Pop | ssh_dir = utils.PathJoin(user_dir, ".ssh")
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85 | 5bae14d9 | Guido Trotter | if mkdir:
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86 | 5bae14d9 | Guido Trotter | utils.EnsureDirs([(ssh_dir, constants.SECURE_DIR_MODE)]) |
87 | 70d9e3d8 | Iustin Pop | elif not os.path.isdir(ssh_dir): |
88 | 898a6d45 | Michael Hanselmann | raise errors.OpExecError("Path %s is not a directory" % ssh_dir) |
89 | 70d9e3d8 | Iustin Pop | |
90 | c4feafe8 | Iustin Pop | return [utils.PathJoin(ssh_dir, base)
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91 | 8a3c9e8a | Michael Hanselmann | for base in ["id_%s" % suffix, "id_%s.pub" % suffix, |
92 | 8a3c9e8a | Michael Hanselmann | "authorized_keys"]]
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93 | 70d9e3d8 | Iustin Pop | |
94 | 70d9e3d8 | Iustin Pop | |
95 | c92b310a | Michael Hanselmann | class SshRunner: |
96 | c92b310a | Michael Hanselmann | """Wrapper for SSH commands.
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97 | a8083063 | Iustin Pop |
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98 | a8083063 | Iustin Pop | """
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99 | b43dcc5a | Manuel Franceschini | def __init__(self, cluster_name, ipv6=False): |
100 | b43dcc5a | Manuel Franceschini | """Initializes this class.
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101 | b43dcc5a | Manuel Franceschini |
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102 | b43dcc5a | Manuel Franceschini | @type cluster_name: str
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103 | b43dcc5a | Manuel Franceschini | @param cluster_name: name of the cluster
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104 | b43dcc5a | Manuel Franceschini | @type ipv6: bool
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105 | b43dcc5a | Manuel Franceschini | @param ipv6: If true, force ssh to use IPv6 addresses only
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106 | b43dcc5a | Manuel Franceschini |
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107 | b43dcc5a | Manuel Franceschini | """
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108 | 56bece1f | Iustin Pop | self.cluster_name = cluster_name
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109 | b43dcc5a | Manuel Franceschini | self.ipv6 = ipv6
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110 | 1ff08570 | Michael Hanselmann | |
111 | 652d6694 | Michael Hanselmann | def _BuildSshOptions(self, batch, ask_key, use_cluster_key, |
112 | 2892a4c9 | Iustin Pop | strict_host_check, private_key=None, quiet=True): |
113 | bf75f132 | Iustin Pop | """Builds a list with needed SSH options.
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114 | bf75f132 | Iustin Pop |
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115 | bf75f132 | Iustin Pop | @param batch: same as ssh's batch option
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116 | bf75f132 | Iustin Pop | @param ask_key: allows ssh to ask for key confirmation; this
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117 | bf75f132 | Iustin Pop | parameter conflicts with the batch one
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118 | bf75f132 | Iustin Pop | @param use_cluster_key: if True, use the cluster name as the
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119 | bf75f132 | Iustin Pop | HostKeyAlias name
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120 | bf75f132 | Iustin Pop | @param strict_host_check: this makes the host key checking strict
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121 | 4403ff8d | René Nussbaumer | @param private_key: use this private key instead of the default
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122 | 2892a4c9 | Iustin Pop | @param quiet: whether to enable -q to ssh
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123 | bf75f132 | Iustin Pop |
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124 | bf75f132 | Iustin Pop | @rtype: list
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125 | a4ccecf6 | Michael Hanselmann | @return: the list of options ready to use in L{utils.process.RunCmd}
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126 | bf75f132 | Iustin Pop |
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127 | bf75f132 | Iustin Pop | """
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128 | f6d9f4c3 | Michael Hanselmann | options = [ |
129 | f6d9f4c3 | Michael Hanselmann | "-oEscapeChar=none",
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130 | f6d9f4c3 | Michael Hanselmann | "-oHashKnownHosts=no",
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131 | 8fd1bfa9 | Michael Hanselmann | "-oGlobalKnownHostsFile=%s" % pathutils.SSH_KNOWN_HOSTS_FILE,
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132 | f6d9f4c3 | Michael Hanselmann | "-oUserKnownHostsFile=/dev/null",
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133 | b427788e | Iustin Pop | "-oCheckHostIp=no",
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134 | f6d9f4c3 | Michael Hanselmann | ] |
135 | f6d9f4c3 | Michael Hanselmann | |
136 | f6d9f4c3 | Michael Hanselmann | if use_cluster_key:
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137 | 56bece1f | Iustin Pop | options.append("-oHostKeyAlias=%s" % self.cluster_name) |
138 | f6d9f4c3 | Michael Hanselmann | |
139 | 2892a4c9 | Iustin Pop | if quiet:
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140 | 2892a4c9 | Iustin Pop | options.append("-q")
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141 | 2892a4c9 | Iustin Pop | |
142 | 4403ff8d | René Nussbaumer | if private_key:
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143 | 4403ff8d | René Nussbaumer | options.append("-i%s" % private_key)
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144 | 4403ff8d | René Nussbaumer | |
145 | 652d6694 | Michael Hanselmann | # TODO: Too many boolean options, maybe convert them to more descriptive
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146 | 652d6694 | Michael Hanselmann | # constants.
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147 | 652d6694 | Michael Hanselmann | |
148 | f6d9f4c3 | Michael Hanselmann | # Note: ask_key conflicts with batch mode
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149 | f6d9f4c3 | Michael Hanselmann | if batch:
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150 | f6d9f4c3 | Michael Hanselmann | if ask_key:
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151 | f6d9f4c3 | Michael Hanselmann | raise errors.ProgrammerError("SSH call requested conflicting options") |
152 | f6d9f4c3 | Michael Hanselmann | |
153 | 652d6694 | Michael Hanselmann | options.append("-oBatchMode=yes")
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154 | 652d6694 | Michael Hanselmann | |
155 | 652d6694 | Michael Hanselmann | if strict_host_check:
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156 | 652d6694 | Michael Hanselmann | options.append("-oStrictHostKeyChecking=yes")
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157 | 652d6694 | Michael Hanselmann | else:
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158 | 652d6694 | Michael Hanselmann | options.append("-oStrictHostKeyChecking=no")
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159 | f6d9f4c3 | Michael Hanselmann | |
160 | e66d9f1a | Iustin Pop | else:
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161 | e66d9f1a | Iustin Pop | # non-batch mode
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162 | e66d9f1a | Iustin Pop | |
163 | e66d9f1a | Iustin Pop | if ask_key:
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164 | e66d9f1a | Iustin Pop | options.append("-oStrictHostKeyChecking=ask")
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165 | e66d9f1a | Iustin Pop | elif strict_host_check:
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166 | e66d9f1a | Iustin Pop | options.append("-oStrictHostKeyChecking=yes")
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167 | e66d9f1a | Iustin Pop | else:
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168 | e66d9f1a | Iustin Pop | options.append("-oStrictHostKeyChecking=no")
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169 | f6d9f4c3 | Michael Hanselmann | |
170 | b43dcc5a | Manuel Franceschini | if self.ipv6: |
171 | b43dcc5a | Manuel Franceschini | options.append("-6")
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172 | b43dcc5a | Manuel Franceschini | |
173 | f6d9f4c3 | Michael Hanselmann | return options
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174 | 1ff08570 | Michael Hanselmann | |
175 | 8f07f831 | Michael Hanselmann | def BuildCmd(self, hostname, user, command, batch=True, ask_key=False, |
176 | 4403ff8d | René Nussbaumer | tty=False, use_cluster_key=True, strict_host_check=True, |
177 | 2892a4c9 | Iustin Pop | private_key=None, quiet=True): |
178 | c92b310a | Michael Hanselmann | """Build an ssh command to execute a command on a remote node.
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179 | c92b310a | Michael Hanselmann |
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180 | c41eea6e | Iustin Pop | @param hostname: the target host, string
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181 | c41eea6e | Iustin Pop | @param user: user to auth as
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182 | c41eea6e | Iustin Pop | @param command: the command
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183 | c41eea6e | Iustin Pop | @param batch: if true, ssh will run in batch mode with no prompting
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184 | c41eea6e | Iustin Pop | @param ask_key: if true, ssh will run with
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185 | c41eea6e | Iustin Pop | StrictHostKeyChecking=ask, so that we can connect to an
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186 | c41eea6e | Iustin Pop | unknown host (not valid in batch mode)
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187 | c41eea6e | Iustin Pop | @param use_cluster_key: whether to expect and use the
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188 | c41eea6e | Iustin Pop | cluster-global SSH key
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189 | c41eea6e | Iustin Pop | @param strict_host_check: whether to check the host's SSH key at all
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190 | 4403ff8d | René Nussbaumer | @param private_key: use this private key instead of the default
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191 | 2892a4c9 | Iustin Pop | @param quiet: whether to enable -q to ssh
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192 | c41eea6e | Iustin Pop |
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193 | c41eea6e | Iustin Pop | @return: the ssh call to run 'command' on the remote host.
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194 | c92b310a | Michael Hanselmann |
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195 | c92b310a | Michael Hanselmann | """
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196 | 2892a4c9 | Iustin Pop | argv = [constants.SSH] |
197 | 652d6694 | Michael Hanselmann | argv.extend(self._BuildSshOptions(batch, ask_key, use_cluster_key,
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198 | 2892a4c9 | Iustin Pop | strict_host_check, private_key, |
199 | 2892a4c9 | Iustin Pop | quiet=quiet)) |
200 | 8f07f831 | Michael Hanselmann | if tty:
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201 | f724a702 | Balazs Lecz | argv.extend(["-t", "-t"]) |
202 | cffbbae7 | Michael Hanselmann | |
203 | cffbbae7 | Michael Hanselmann | argv.append("%s@%s" % (user, hostname))
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204 | cffbbae7 | Michael Hanselmann | |
205 | cffbbae7 | Michael Hanselmann | # Insert variables for virtual nodes
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206 | cffbbae7 | Michael Hanselmann | argv.extend("export %s=%s;" %
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207 | cffbbae7 | Michael Hanselmann | (utils.ShellQuote(name), utils.ShellQuote(value)) |
208 | cffbbae7 | Michael Hanselmann | for (name, value) in |
209 | cffbbae7 | Michael Hanselmann | vcluster.EnvironmentForHost(hostname).items()) |
210 | cffbbae7 | Michael Hanselmann | |
211 | cffbbae7 | Michael Hanselmann | argv.append(command) |
212 | cffbbae7 | Michael Hanselmann | |
213 | c92b310a | Michael Hanselmann | return argv
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214 | c92b310a | Michael Hanselmann | |
215 | 54ab6aec | Michael Hanselmann | def Run(self, *args, **kwargs): |
216 | c92b310a | Michael Hanselmann | """Runs a command on a remote node.
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217 | c92b310a | Michael Hanselmann |
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218 | c92b310a | Michael Hanselmann | This method has the same return value as `utils.RunCmd()`, which it
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219 | c92b310a | Michael Hanselmann | uses to launch ssh.
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220 | c92b310a | Michael Hanselmann |
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221 | c41eea6e | Iustin Pop | Args: see SshRunner.BuildCmd.
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222 | c92b310a | Michael Hanselmann |
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223 | a4ccecf6 | Michael Hanselmann | @rtype: L{utils.process.RunResult}
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224 | a4ccecf6 | Michael Hanselmann | @return: the result as from L{utils.process.RunCmd()}
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225 | c92b310a | Michael Hanselmann |
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226 | c92b310a | Michael Hanselmann | """
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227 | 54ab6aec | Michael Hanselmann | return utils.RunCmd(self.BuildCmd(*args, **kwargs)) |
228 | c92b310a | Michael Hanselmann | |
229 | c92b310a | Michael Hanselmann | def CopyFileToNode(self, node, filename): |
230 | c92b310a | Michael Hanselmann | """Copy a file to another node with scp.
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231 | c92b310a | Michael Hanselmann |
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232 | c41eea6e | Iustin Pop | @param node: node in the cluster
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233 | c41eea6e | Iustin Pop | @param filename: absolute pathname of a local file
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234 | c92b310a | Michael Hanselmann |
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235 | c41eea6e | Iustin Pop | @rtype: boolean
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236 | c41eea6e | Iustin Pop | @return: the success of the operation
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237 | a8083063 | Iustin Pop |
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238 | c92b310a | Michael Hanselmann | """
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239 | c92b310a | Michael Hanselmann | if not os.path.isabs(filename): |
240 | 23828f1c | Iustin Pop | logging.error("File %s must be an absolute path", filename)
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241 | c92b310a | Michael Hanselmann | return False |
242 | a8083063 | Iustin Pop | |
243 | 1d544ba3 | Michael Hanselmann | if not os.path.isfile(filename): |
244 | 23828f1c | Iustin Pop | logging.error("File %s does not exist", filename)
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245 | 1d544ba3 | Michael Hanselmann | return False |
246 | 1d544ba3 | Michael Hanselmann | |
247 | 2892a4c9 | Iustin Pop | command = [constants.SCP, "-p"]
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248 | 652d6694 | Michael Hanselmann | command.extend(self._BuildSshOptions(True, False, True, True)) |
249 | c92b310a | Michael Hanselmann | command.append(filename) |
250 | 8062638d | Manuel Franceschini | if netutils.IP6Address.IsValid(node):
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251 | 8062638d | Manuel Franceschini | node = netutils.FormatAddress((node, None))
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252 | 8062638d | Manuel Franceschini | |
253 | cffbbae7 | Michael Hanselmann | command.append("%s:%s" % (node, vcluster.ExchangeNodeRoot(node, filename)))
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254 | a8083063 | Iustin Pop | |
255 | c92b310a | Michael Hanselmann | result = utils.RunCmd(command) |
256 | a8083063 | Iustin Pop | |
257 | c92b310a | Michael Hanselmann | if result.failed:
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258 | 9dc45ab1 | Michael Hanselmann | logging.error("Copy to node %s failed (%s) error '%s',"
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259 | 9dc45ab1 | Michael Hanselmann | " command was '%s'",
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260 | 23828f1c | Iustin Pop | node, result.fail_reason, result.output, result.cmd) |
261 | a8083063 | Iustin Pop | |
262 | c92b310a | Michael Hanselmann | return not result.failed |
263 | a8083063 | Iustin Pop | |
264 | c92b310a | Michael Hanselmann | def VerifyNodeHostname(self, node): |
265 | c92b310a | Michael Hanselmann | """Verify hostname consistency via SSH.
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266 | a8083063 | Iustin Pop |
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267 | c92b310a | Michael Hanselmann | This functions connects via ssh to a node and compares the hostname
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268 | c92b310a | Michael Hanselmann | reported by the node to the name with have (the one that we
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269 | c92b310a | Michael Hanselmann | connected to).
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270 | a8083063 | Iustin Pop |
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271 | c92b310a | Michael Hanselmann | This is used to detect problems in ssh known_hosts files
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272 | 5bbd3f7f | Michael Hanselmann | (conflicting known hosts) and inconsistencies between dns/hosts
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273 | c92b310a | Michael Hanselmann | entries and local machine names
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274 | a8083063 | Iustin Pop |
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275 | c41eea6e | Iustin Pop | @param node: nodename of a host to check; can be short or
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276 | c41eea6e | Iustin Pop | full qualified hostname
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277 | a8083063 | Iustin Pop |
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278 | c41eea6e | Iustin Pop | @return: (success, detail), where:
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279 | c41eea6e | Iustin Pop | - success: True/False
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280 | c41eea6e | Iustin Pop | - detail: string with details
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281 | a8083063 | Iustin Pop |
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282 | c92b310a | Michael Hanselmann | """
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283 | cffbbae7 | Michael Hanselmann | cmd = ("if test -z \"$GANETI_HOSTNAME\"; then"
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284 | cffbbae7 | Michael Hanselmann | " hostname --fqdn;"
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285 | cffbbae7 | Michael Hanselmann | "else"
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286 | cffbbae7 | Michael Hanselmann | " echo \"$GANETI_HOSTNAME\";"
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287 | cffbbae7 | Michael Hanselmann | "fi")
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288 | 052783ff | Michael Hanselmann | retval = self.Run(node, constants.SSH_LOGIN_USER, cmd, quiet=False) |
289 | a8083063 | Iustin Pop | |
290 | c92b310a | Michael Hanselmann | if retval.failed:
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291 | c92b310a | Michael Hanselmann | msg = "ssh problem"
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292 | c92b310a | Michael Hanselmann | output = retval.output |
293 | c92b310a | Michael Hanselmann | if output:
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294 | c92b310a | Michael Hanselmann | msg += ": %s" % output
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295 | a162cf5b | Iustin Pop | else:
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296 | a162cf5b | Iustin Pop | msg += ": %s (no output)" % retval.fail_reason
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297 | 099c52ad | Iustin Pop | logging.error("Command %s failed: %s", retval.cmd, msg)
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298 | c92b310a | Michael Hanselmann | return False, msg |
299 | a8083063 | Iustin Pop | |
300 | c92b310a | Michael Hanselmann | remotehostname = retval.stdout.strip() |
301 | a8083063 | Iustin Pop | |
302 | c92b310a | Michael Hanselmann | if not remotehostname or remotehostname != node: |
303 | 31821208 | Iustin Pop | if node.startswith(remotehostname + "."): |
304 | 31821208 | Iustin Pop | msg = "hostname not FQDN"
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305 | 31821208 | Iustin Pop | else:
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306 | 2175e25d | Manuel Franceschini | msg = "hostname mismatch"
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307 | 31821208 | Iustin Pop | return False, ("%s: expected %s but got %s" % |
308 | 31821208 | Iustin Pop | (msg, node, remotehostname)) |
309 | a8083063 | Iustin Pop | |
310 | c92b310a | Michael Hanselmann | return True, "host matches" |
311 | 75a5f456 | Michael Hanselmann | |
312 | 75a5f456 | Michael Hanselmann | |
313 | 7688d0d3 | Michael Hanselmann | def WriteKnownHostsFile(cfg, file_name): |
314 | 75a5f456 | Michael Hanselmann | """Writes the cluster-wide equally known_hosts file.
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315 | 75a5f456 | Michael Hanselmann |
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316 | 75a5f456 | Michael Hanselmann | """
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317 | a3f9f296 | Guido Trotter | utils.WriteFile(file_name, mode=0600,
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318 | 7688d0d3 | Michael Hanselmann | data="%s ssh-rsa %s\n" % (cfg.GetClusterName(),
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319 | 75a5f456 | Michael Hanselmann | cfg.GetHostKey())) |