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passwd

passwd 2.0 KB
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  1. .TH PASSWD 1
    2. 

  2. .SH NAME
    3. 

  3. passwd, netkey, iam \- change user password
    4. 

  4. .SH SYNOPSIS
    5. 

  5. .B passwd
    6. 

  6. [
    7. 

  7. .I username\fR[@\fPdomain\fR]\fP
    8. 

  8. ]
    9. 

  9. .PP
    10. 

  10. .B netkey
    11. 

  11. .PP
    12. 

  12. .B auth/iam
    13. 

  13. [
    14. 

  14. .I username
    15. 

  15. ]
    16. 

  16. .SH DESCRIPTION
    17. 

  17. .I Passwd
    18. 

  18. changes the invoker's Plan 9 password and/or APOP secret.
    19. 

  19. The Plan 9 password is used to login to a terminal while
    20. 

  20. the APOP secret is used for a number of external services:
    21. 

  21. POP3, IMAP, and VPN access.  The optional argument specifies
    22. 

  22. the user name and authentication domain to use if different
    23. 

  23. than the one associated with the machine
    24. 

  24. .I passwd
    25. 

  25. is run on.
    26. 

  26. .PP
    27. 

  27. The program first prompts for the old Plan 9 password in the specified
    28. 

  28. domain to establish
    29. 

  29. identity.
    30. 

  30. It then prompts for changes to the password and the
    31. 

  31. secret.
    32. 

  32. New passwords and secrets must be typed twice, to forestall mistakes.
    33. 

  33. New passwords must be sufficiently hard to guess.
    34. 

  34. They may be of any length greater than seven characters.
    35. 

  35. .PP
    36. 

  36. .I Netkey
    37. 

  37. uses the password to encrypt network challenges.
    38. 

  38. It is a substitute for a SecureNet box.
    39. 

  39. .PP
    40. 

  40. These commands may be run only on a terminal, to avoid
    41. 

  41. transmitting clear text passwords over the network.
    42. 

  42. .PP
    43. 

  43. .I Auth/iam
    44. 

  44. can be run only by the the host owner (the user specified as the contents of
    45. 

  45. .BR /dev/hostower ).
    46. 

  46. With it both the identity and password of the host owner may
    47. 

  47. be changed.  For example, if start a terminal and log in as
    48. 

  48. .LR tor ,
    49. 

  49. you may later change identity to
    50. 

  50. .LR supertor .
    51. 

  51. If the host owner changes, all processes running as the host owner
    52. 

  52. also change their identity to the new user id.
    53. 

  53. .PP
    54. 

  54. Without an argument, 
    55. 

  55. .I Auth/iam
    56. 

  56. just sets the password of the host owner.
    57. 

  57. This can be used on machines like the Bitsy which have no
    58. 

  58. possibility of user input until the bootstrap procedure has already
    59. 

  59. started a number of processes.
    60. 

  60. .SH FILES
    61. 

  61. .B /dev/key
    62. 

  62. .SH SOURCE
    63. 

  63. .B /sys/src/cmd/auth/passwd.c
    64. 

  64. .br
    65. 

  65. .B /sys/src/cmd/auth/netkey.c
    66. 

  66. .SH "SEE ALSO"
    67. 

  67. .IR encrypt (2),
    68. 

  68. .IR cons (3),
    69. 

  69. .IR securenet (8)
    70. 

  70. .PP
    71. 

  71. Robert Morris and Ken Thompson,
    72. 

  72. ``UNIX Password Security,''
    73. 

  73. .I AT&T Bell Laboratories Technical Journal
    74. 

  74. Vol 63 (1984), pp. 1649-1672
    75.