112 lines
5.8 KiB
Bash
112 lines
5.8 KiB
Bash
#!/usr/bin/env bash
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# Reset an M365 user's password via Graph (app-only, tenant-admin tier).
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#
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# Usage: reset-password.sh <tenant-id-or-domain> <upn> <new-password> [--force-change]
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# --force-change set forceChangePasswordNextSignIn=true (default: false / permanent)
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#
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# Why this script exists:
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# A plain PATCH of passwordProfile works for ordinary members, but Microsoft
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# protects admin-role holders: resetting the password of a user who holds a
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# directory role (e.g. SharePoint/Teams/User Administrator) requires the CALLER
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# to hold Global Administrator or Privileged Authentication Administrator. The
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# Tenant Admin app has User.ReadWrite.All but no standing directory role, so it
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# gets 403 on admin targets.
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#
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# This script does a JUST-IN-TIME elevation: if the direct reset 403s, it
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# assigns the Tenant Admin service principal the Privileged Authentication
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# Administrator role (the app already holds RoleManagement.ReadWrite.Directory),
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# retries the reset, then REMOVES the role assignment it created. No standing
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# super-privilege is left behind. If the SP already held the role, it is left
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# untouched.
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#
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# Output: human-readable status to stdout. Exit 0 on success.
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set -euo pipefail
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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TENANT_INPUT="${1:?usage: reset-password.sh <tenant|domain> <upn> <new-password> [--force-change]}"
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UPN="${2:?usage: reset-password.sh <tenant|domain> <upn> <new-password> [--force-change]}"
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NEWPW="${3:?usage: reset-password.sh <tenant|domain> <upn> <new-password> [--force-change]}"
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FORCE_CHANGE="false"
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[[ "${4:-}" == "--force-change" ]] && FORCE_CHANGE="true"
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# Privileged Authentication Administrator (built-in role template / definition id)
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PAA_ROLE_ID="7be44c8a-adaf-4e2a-84d6-ab2649e08a13"
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TENANT_ADMIN_APPID="709e6eed-0711-4875-9c44-2d3518c47063"
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TENANT_ID=$("$SCRIPT_DIR/resolve-tenant.sh" "$TENANT_INPUT")
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TOKEN=$("$SCRIPT_DIR/get-token.sh" "$TENANT_ID" tenant-admin)
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GH=(-H "Authorization: Bearer $TOKEN" -H "Content-Type: application/json")
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G="https://graph.microsoft.com/v1.0"
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# --- resolve target user object id ---
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UID_=$(curl -s "${GH[@]}" "$G/users/${UPN}?\$select=id" | tr -d '\000-\037' \
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| python -c "import sys,json;print(json.load(sys.stdin).get('id',''))" 2>/dev/null || true)
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[[ -z "$UID_" ]] && { echo "[ERROR] user not found: $UPN" >&2; exit 1; }
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echo "[info] tenant=$TENANT_ID target=$UPN id=$UID_ force_change=$FORCE_CHANGE"
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# --- build payload (single-quoted heredoc would block $NEWPW; use python to emit JSON safely) ---
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PAYLOAD=$(NEWPW="$NEWPW" FC="$FORCE_CHANGE" python -c "import os,json;print(json.dumps({'passwordProfile':{'password':os.environ['NEWPW'],'forceChangePasswordNextSignIn':os.environ['FC']=='true'}}))")
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do_patch() {
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curl -s -o /dev/null -w "%{http_code}" -X PATCH "${GH[@]}" "$G/users/$UID_" --data-binary "$PAYLOAD"
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}
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CODE=$(do_patch)
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if [[ "$CODE" == "204" ]]; then
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echo "[OK] password reset for $UPN (no elevation needed)"
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exit 0
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fi
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if [[ "$CODE" != "403" ]]; then
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echo "[ERROR] unexpected HTTP $CODE on password PATCH" >&2
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curl -s -X PATCH "${GH[@]}" "$G/users/$UID_" --data-binary "$PAYLOAD" | tr -d '\000-\037' >&2
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exit 1
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fi
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echo "[info] 403 on direct reset (target likely holds an admin role) -> JIT elevation"
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# --- resolve tenant-admin SP object id ---
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SPID=$(curl -s "${GH[@]}" "$G/servicePrincipals(appId='$TENANT_ADMIN_APPID')?\$select=id" | tr -d '\000-\037' \
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| python -c "import sys,json;print(json.load(sys.stdin).get('id',''))")
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[[ -z "$SPID" ]] && { echo "[ERROR] could not resolve Tenant Admin service principal" >&2; exit 1; }
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# --- does the SP already hold Privileged Authentication Administrator? ---
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EXISTING=$(curl -s "${GH[@]}" "$G/roleManagement/directory/roleAssignments?\$filter=principalId+eq+'$SPID'+and+roleDefinitionId+eq+'$PAA_ROLE_ID'" \
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| tr -d '\000-\037' | python -c "import sys,json;v=json.load(sys.stdin).get('value',[]);print(v[0]['id'] if v else '')" 2>/dev/null || true)
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CREATED_ASSIGNMENT=""
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if [[ -n "$EXISTING" ]]; then
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echo "[info] SP already holds Privileged Authentication Administrator (standing) -> not modifying role"
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else
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ASSIGN_BODY=$(SPID="$SPID" RID="$PAA_ROLE_ID" python -c "import os,json;print(json.dumps({'principalId':os.environ['SPID'],'roleDefinitionId':os.environ['RID'],'directoryScopeId':'/'}))")
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CREATED_ASSIGNMENT=$(curl -s -X POST "${GH[@]}" "$G/roleManagement/directory/roleAssignments" --data-binary "$ASSIGN_BODY" \
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| tr -d '\000-\037' | python -c "import sys,json;d=json.load(sys.stdin);print(d.get('id',''))" 2>/dev/null || true)
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[[ -z "$CREATED_ASSIGNMENT" ]] && { echo "[ERROR] failed to assign Privileged Authentication Administrator to SP" >&2; exit 1; }
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echo "[info] assigned Privileged Authentication Administrator to SP (assignment $CREATED_ASSIGNMENT)"
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fi
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# --- de-elevation runs no matter how we exit, but only removes what WE created ---
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cleanup() {
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if [[ -n "$CREATED_ASSIGNMENT" ]]; then
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DC=$(curl -s -o /dev/null -w "%{http_code}" -X DELETE "${GH[@]}" "$G/roleManagement/directory/roleAssignments/$CREATED_ASSIGNMENT")
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if [[ "$DC" == "204" ]]; then echo "[info] removed JIT role assignment (de-elevated)"; else echo "[WARNING] failed to remove JIT role assignment $CREATED_ASSIGNMENT (HTTP $DC) - REMOVE MANUALLY" >&2; fi
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fi
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}
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trap cleanup EXIT
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# --- retry the reset; role propagation can take a few seconds ---
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for i in 1 2 3 4 5 6; do
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sleep 10
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CODE=$(do_patch)
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if [[ "$CODE" == "204" ]]; then
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echo "[OK] password reset for $UPN (via JIT Privileged Authentication Administrator)"
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exit 0
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fi
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echo "[info] attempt $i: HTTP $CODE (waiting for role propagation)"
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done
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echo "[ERROR] password reset still failing after elevation (last HTTP $CODE)" >&2
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curl -s -X PATCH "${GH[@]}" "$G/users/$UID_" --data-binary "$PAYLOAD" | tr -d '\000-\037' >&2
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exit 1
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